Corsair Marine | F-31 | Specifications | Corsair Marine F-31 Specifications

For All Corsair Models
November, 1997
Sailing Manual For All
Corsair Models
Including F-24, F-28 and F-31
This manual has been compiled to help you to operate your craft with
safety and enjoyment. It contains details of the craft, the equipment
supplied or fitted, its systems, and information on its operation and
maintenance. Please read it carefully and familiarize yourself with
the craft before using it.
If this is your first craft, or you are changing to a type of craft you are
not familiar with, for your own comfort or safety, please ensure that
you obtain handling and operating experience before assuming
command of the craft. Your dealer or national sailing federation or
yacht club will be pleased to advise you of local sailing schools or
competent instructors.
Hull Number__________________________________
Owner 1. ___________________________ Owner 2. ___________________________ Owner 3. __________________________
___________________________________ __________________________________
Built By:
Corsair Marine, Inc.
150 Reed Court, Chula Vista, CA 91911, U.S.A.
Page 1
Copyright © 1997 By Corsair Marine
General............................................... 3
Preparation.......................................... 3
Loading .............................................. 3
Safety Compartment........................... 4
Outboard Motor.................................. 4
Trailering ............................................5
Launching........................................... 9
Mast Raising On The Water................ 11
Rudder................................................. 11
Mast Setup..................................................11
The Basics......................................... 12
Reefing.............................................. 13
Rotating Mast Control.......................15
Windward Performance.....................15
Screacher........................................... 16
Spinnaker Jibing................................17
Spinnaker Sailing Downwind............18
Safe Sailing Recommendations.........19
Sailing Hints......................................21
Retrieving To Trailer .......................... 23
De-rigging .......................................... 24
Lifting Out.......................................... 26
Marina Docking.................................. 26
Unsinkability..................................... 27
Offshore Sailing ............................... 27
Capsize.............................................. 27
Personal Responsibility ....................30
Safety In General ..............................31
Copyright © 1997 By Corsair Marine
Technical Notes...................................31
Winch line......................................... 31
Spring Retaining Clips...................... 31
Launching......................................... 31
Beam Bolts........................................ 31
Hoisting Mainsail.............................. 31
Bearing Away.................................... 31
Heavy Helm...................................... 31
Rudder/Daggerboard hum................. 31
Rudder Ventilation............................ 31
Shroud Tensioners............................. 32
Compression Pads............................. 32
Bimini Top Storage............................32
Float/Beam Vents.............................. 32
Cleaning Floats..................................33
Clean Boat Hint.................................33
Collision............................................ 33
Hurricane Survival............................ 33
SPECIFICATIONS ............................ 34
F-24 Mk II Sail Plan........................... 35
F-28 & F-28R Sail Plan...................... 36
F-31 Sail Plan......................................37
F-31R Sail Plan................................... 38
F-24 Interior........................................ 39
F-24 Deck Layout............................... 39
F-28 Interior........................................ 40
F-28 Deck Layout............................... 40
F-31 Aft Cockpit Interior.................... 41
F-31 Aft Cockpit Deck Layout............41
Typical Trailer Setup .......................... 42
Warranty & Limitation of Liability..... 43
Maintenance & Safety Checklist ........44
Page 2
Corsair trimarans taking part in the 1997 U.S. National Titles, Pensacola, Florida. Farrier designs have now been sailing
extensively world wide for over 20 years, and the experience from all these years is the basis for this manual.
This manual contains important information about the safe
operation and maintenance of your Corsair built trimaran. Read
it carefully, become familiar with the procedures described, and
follow the recommendations to help make your sailing enjoyable
and trouble-free.
Multihulls should be treated like aircraft when it comes to
loading. Corsair trimarans are light, responsive craft, and
due to their narrow waterline do not have an unlimited load
carrying ability. Overloading can affect performance and
handling, while excessive overloading can also affect safety
margins, the ratio of float buoyancy relative to the total weight
falling. A higher ratio is faster and safer. Always be conscious
of weight and take care not to carry unnecessary items.
The load-carrying capacity of the different Corsair models
is listed in the back of this manual. Some overloading is
acceptable for general sailing in sheltered waters, the only
adverse affect being a loss in performance. However, an
overloaded boat offshore in large waves can become dangerous due to greater loads generated in the structure, and
the sluggishness which can prevent the boat from rising to go
over, or with the waves, as it should.
When storing supplies, try to keep all heavy items located
as low down as possible and in the forward end of the
cabin. Avoid storing any heavy items inside aft of the main
entry hatch, as too much weight aft can cause transom drag,
affecting performance. Farrier designs have a very buoyant
bow, which actually lifts at speed, and additional weight
Corsair trimarans are designed and built as high performance cruising yachts, which when used as intended, with
their enormous stability and unsinkability, are among the
safest and fastest yachts afloat.
As you become familiar with your boat, you may discover
alternative methods of operation that have advantages. We
would appreciate if you would share these with us so that we
can share them with other owners.
Before going sailing, you will need to provide the proper
safety equipment as required by local regulations. This will
usually include life jackets for all crew members, safety
harnesses for children, anchor, compass, bilge pump, fog
horn, First Aid kit, fire extinguishers, flashlight and batteries,
life buoy, flares, a chart of the area to be sailed, food, water,
and adequate fuel.
Page 3
Copyright © 1997 By Corsair Marine
should always be kept forward rather than aft.
Should your model have float storage, avoid heavy loads
in the floats. These should only be used for light bulky items
such as sails, fenders etc. Heavy weight in the ends of any
boat, be it the bow, stern, or floats, can adversely affect the
general motion.
To maintain a light boat, and that sparkling edge to
performance, it is highly recommended that you go through
everything on board several times a year, and take off any
items that do not get used. This prevents the gradual buildup
of unnecessary weight.
Before sailing, it is important that the Safety Compartment be loaded with the appropriate safety gear. This
compartment is accessible from top or bottom and is usually
located in a cockpit coaming, or under the cockpit seat.
Its purpose is to keep important safety equipment that
should be available to the crew in any emergency situation,
including a capsize. The equipment stored here should
include flares, a handheld VHF radio, EPIRB (offshore),
extra line, spare tools, cutting implements etc. in watertight
bags (this is not a watertight compartment).
No multihull should venture offshore without
safety gear in such a compartment
The recommended motor size is given in the specifications at the back of this manual and this is more than
adequate for most circumstances.
A long shaft motor is the minimum required, and the extra
long 25" shaft motors are the best. A remote control can
also help make operation very easy with aft cabin models.
With weight being important, try to choose a light outboard.
There are a number of specialist ‘Sail Boat’ motors now
available and some of these are designed for heavy, hard to
push, displacement boats, and their propellers are effectively ’geared down’ to give high thrust at low speeds.
However, Corsair trimarans have a very easily driven hull
and may not need such a propeller. The result can be the
same as always driving your car in low gear. You will have
plenty of thrust, but speed is low, and economy can be poor.
These motors do have advantages, and if used, you may
need to experiment with different propellers to get the best
and most efficient performance.
Refer to the engine manual for details of operation,
maintenance and winter storage. Always be sure you have
enough fuel for your planned trip.
The motor can be used while the floats are extended or
folded and should always be tilted up when sailing.
The original prototype F-31 aft cabin, with outboard and underslung rudder system. This type of rudder can be
removed altogether for long distance trailering. Aft cockpit models all now use transom hung rudders.
Copyright © 1997 By Corsair Marine
Page 4
Light bar being fitted on an F-28. Note vertical position of transom hung rudder blade for trailering
The daggerboard SHOULD ALWAYS BE DOWN when
motoring, to prevent any sideways movement. If not, the
boat will have a hovercraft like motion with wide skidding
turns. With the board down, handling is excellent.
The total towing weight can vary considerably, depending
on model and options, and can be determined exactly by
using a weighbridge. Check that the vehicle is approved and
equipped as recommended by its manufacturer for towing
this weight, and the capacity of the towing hitch is suitable.
While towing, watch for strong crosswinds. A Corsair is a
relatively light boat for towing, but it still has considerable
windage. For easy, stable towing, the trailer should be
balanced to have 5 to 10% of the total weight on the coupling
ball. This can be measured by a bathroom scale. If you find
‘fish tailing’ occurs, increase this weight. If necessary, a
simple change like shifting the gas tank or outboard forward
can make a considerable difference to trailer behavior.
Trailer lights are fitted either on special brackets or as a
separate light bar on the boat’s transom. They are thus
independent from the trailer, and the wiring never gets near
the water, considerably improving reliability. If separate, be
sure to fit the correct lights on the appropriate sides. The wire
should be run along the top of the boat, looped around the
foredeck cleat and then connected to the towing vehicle.
Independent wiring avoids the frequent breakdowns that
occur with wiring through the trailer being attacked by
saltwater. When the trailer is being towed on its own, the
lights can be mounted directly to the trailer.
Before trailering, check that tires are inflated correctly, the
beam locking pins are in place, the rudder is fully up and tied
to one side, the pop-top or hatch is secured, and the boat is
tied down to the trailer. There should be one tie-down per
side, these being looped around the winches or brackets on
the cockpit coamings, and tied to the tie-down loops on the
trailer. The bow eye should also be tied down to the winch
post, in addition to the winch line. Check that all the trailer
supports always bear equally against the hulls.
When trailering, BE SURE to pivot up or remove the
trailer jockey wheel, and that the hitch is locked on to the ball.
Should the mast extend back past the trailer lights by
more than the legal amount, the appropriate warning flag
should be tied on the back. The mast can be positioned far
enough forward to eliminate any excessive overhang, but
this may not be possible if the towing vehicle is a van.
When trailering, always allow extra distance for stopping.
Particularly watch for low bridges, overhanging trees or
awnings etc. If necessary, the boat can be partially unfolded
on the trailer in order to pass under a low bridge.
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Copyright © 1997 By Corsair Marine
Don’t be dismayed if it takes you considerably longer the first
few times out. It will take a little practice to become familiar
with the procedures, and the more you rig the boat, the
easier and quicker it will become. However, it is very important to follow a set procedure each time.
Measure and KNOW the overall height on the trailer.
Care should be taken to avoid all low, overhead
Recommended Set-Up Procedure Is As Follows:
The following is a general rigging procedure and applies
to all models. There is also a separate more specific procedure for each model. For ease of rigging, it is highly recommended that you follow this general procedure, it having
been developed from hundreds of launchings and proven to
be fast, easy and efficient.
Always park into the wind, or uphill to help the mast
stay in line while being winched up. Trailer should
remain hooked to towing vehicle.
2. Undo the trailer winch hook, and pull some slack so that
the hook will pass over the bow roller. Leave it lying on the
3. Place the mast raising pole on the foredeck ready for
use. Climb onto the bow using the nonskid areas on the float
bows as stepping points.
Two people should be able to completely rig an F-24, F-28
or F-31 ready to launch in under 20 minutes of arriving at the
ramp by using the correct procedure. It is possible in fact, to
be launched, unfolded, and sailing within 15 minutes with
just two. One person should be able to have the boat rigged
and launched in around 30 minutes. However, note that
loading any extra gear or supplies onto the boat is not
counted in these times.
Before starting to rig, check to see that there are no
powerlines for the mast to touch while being raised,
or while being moved to the ramp.
1. Remove the trailer tie-downs, and the trailer lights. The
tie-downs can be tied together and used as the bow line for
launching. Saves stowing them, and then finding a bow line.
The float bows can be slippery - particularly warn
children to take care while climbing up or down.
4. Move aft alongside the mast undoing the mast ties (at
each end) and the rigging ties as you go.
5. Lift the forward end of the mast and walk aft, rolling the
mast on the aft mast roller while checking that the rigging
wires do not catch. Stop once the mast foot is over the pivot
brackets. Now’s the time to fit any masthead indicator to the
top of the mast. Lift the mast up until the indicator can be fitted
to the masthead from the ground behind the boat. If rigging
single-handed, the mast can usually be balanced in this
position to enable fitting.
With F-28 & F-31R rotating masts, the mast
yoke will now need to be fitted to the mast foot
using the through pin (yoke can also be fitted
prior to rolling mast back, or be left on the foot
at prior de-rigging). Another alternative is to
attach the yoke to the deck first, then fit the
mast to it.
6. The mast foot is now connected to the
mast step as follows:
F-24 Mk II: Plugged onto pin in the deck step.
F-28: Yoke is attached to the two deck brackets with fast pins
F-31: Plugged onto pin in deck step.
Mast rolled back and being fitted to deck pivot brackets
Copyright © 1997 By Corsair Marine
Page 6
F-31R rotating: Attach yoke to deck brackets
with fast pins
moderate tension on the raising wires throughout the complete raising procedure.
9. Take the trailer winch line hook, pull it back over the
pole and connect it to the jib halyard snapshackle (after it
has been unhooked from the mast). Winch line should
extend at least 2' aft of the mast pole fork.
Check to see that the jib halyard is SECURELY TIED
OFF at the cleat on the side of the mast.
With rotating masts, the shrouds must always be
connected to the floats, otherwise there is a danger
that mast could topple forward with over-winching.
Mast raising pole in position on an F-28 with winch line
connected to jib halyard, ready to raise mast. Shrouds must
be attached to floats to prevent mast falling forwards.
With the F-31 non-rotating mast, it may be necessary to
push the mast firmly aft to fit on the pin. If difficult, check that
all stays are clear, the terminals into the mast have not
snagged sideways, and the mast is centered on the aft roller.
7. Fit the mast raising wires . These are led from the eye
around 8' up the front of the mast (side of the mast with nonrotating masts) to the side anchors on the cabin roof (aligned
with the mast pivot point). These raising wire anchors can be
'clip on' or 'lift up loops' or extra chainplates, depending on
Note that the length of these raising wires is adjustable
and they should be slightly loose and monitored on the first
mast raising. This is to ensure they cannot become overtight
during the initial raising procedure. They should never be
more than moderately tight, and, once adjusted and set, should need no further monitoring or adjustment.
An alternative to raising wires is to use the
spinnaker and screacher halyards. These can
also provide an extra backup in difficult conditions, but they do take longer to setup. If used,
they must be cleated at the bottom to the mast.
8. Position the mast raising pole on the
mast or in the yoke socket. Attach the wire from
the top of the pole to the eye on the front of the
mast, with the pole being approximately perpendicular to the mast.
If considered necessary, (strong cross winds
or single-handed) additional light side lines can
be fitted from the pole end to the raising wire
anchors to stabilize pole sideways.
Where the yoke is used (F-28 and F-31R
rotating masts) the length of the wire from the
pole to the mast can also be adjusted, and a
little experimenting will give an almost perfect
10. The mast is now winched up, CHECKING AGAIN
Check to see that all rigging wires are clear and have not
snagged anywhere, particularly aft chainplates on F-31s.
Raising wires should initially be slightly loose, and tighten
slightly on the way up.
During mast raising, it is very important to be alert to
all items of rigging lifting or supporting the mast. If any
resistance to raising is felt at any point, STOP and
check that nothing has fouled. Do not proceed until
any obstruction is clear
If the mast raising pole tends to twist sideways this can be
controlled by light lines to the raising wire anchors as
mentioned earlier.
Mast on its way up and being held from going sideways by raising wires
Page 7
Copyright © 1997 By Corsair Marine
Check that the socket in the rotating mast foot aligns
correctly with the pivot ball on the deck, as the mast nears the
fully up position.
Winch operator should be careful to ensure that the
trailer winch line lays evenly across the drum while
mast is being raised. With an offset bow roller, there
can be a tendency for the incoming line to pile up on
one side of the drum, to where it can suddenly slip off.
to 2° more than the rake of the aft edge of the forward beams
when viewed from the side. Once initial adjustment has been
done, the forestay turnbuckle does not need to be undone
during normal rigging or de-rigging, only the clevis pin is
removed or inserted.
Lower and intermediate shrouds on the fixed F-31 mast
remain connected during all rigging and de-rigging
procedures. After the initial adjustment, there is also no
need to undo these or disconnect them from the shroud
Monitor the float shrouds with rotating masts on initial
rigging to ensure they do not become too tight or catch on
anything during raising. F-28 and F-31R (rotating masts)
have either special link plates or a Highfield lever system on
the float decks that allow the shroud enough slack for the
mast to be fully raised when the float is folded, while
preventing any danger of the mast toppling forward. The F24's special folding geometry allows this on its own.
These Link Plates are an important safeguard against
accidently dropping the mast while folding or unfolding, so do
not remove.
The F-31 mast is large and heavy, with high loads, and
extra caution should be taken to ensure it is not able to swing
too far sideways. Never park in a cross wind or sideways on
a slope, unless extra help is available to steady mast.
11. Once the mast is fully up, connect forestay. At initial
rigging mast rake should be set to around 3 to 4°, which is 1
Always leave mast raising wires attached until after the boat
is unfolded. F-28 'fold down' anchoring loops shown here.
12. Once forestay is connected, slacken off the trailer
winch, disconnect the jib halyard, and return it to the mast.
Remove raising pole, mast yoke, rewind the winch and
reconnect hook to the bow eye.
Leave mast raising wires attached to the mast, as
these are still required for support until after the floats are
unfolded and shrouds properly connected to floats.
Link plate system on the F-28. Pulling the lower left clevis
pin releases the shroud, but it remains secured to the float
by the link to the u-bolt to the right, while allowing just
enough slack for the float to fold (see page 24).
Copyright © 1997 By Corsair Marine
13. The topping lift is now disconnected from the mast
lower end and connected to the end of the boom to help take
the weight. Remove the sail bag from the mainsail/boom and
connect the boom to the mast.
14. Tighten all the battens in the mainsail, if required.
Connect the mainsheet to the boom. Feed the mainsail head
into the track on the mast and connect the main halyard
Page 8
15. Run all the halyard lines from the mast
through the turning blocks back to the correct
rope clutches on the aft end of the cabin roof.
16. Connect the mast electric plug if required.
17. The headsail can be fitted now if wished,
or after launching. The sheets are laid out and
connected to the clew (sheets can be kept in
the anchor well for quick access). The headsail can be kept under control by a shockcord
which can be left on the foredeck for this
purpose. Just keep it hooked to the toerail or
18. Untie the rudder, and check that the
daggerboard up-line is cleated. The outboard
motor should also be in the up position.
19. The aft mast support is now removed
and stored. You are now ready to launch.
Launching the F-28
Before taking the boat to the ramp, check to see that
there are no powerlines for the mast to touch.
Back the trailer down the ramp until the trailer is submerged up until just past the inward bend of the side frame
members (about 6 to 8' back from the winch post).
Disconnect the winch hook and push the boat off, while
holding on to the bow line, or you can get on board (but start
the motor first before pushing off). Be careful of crosswinds
or wind from the stern. The boat, with its shallow draft, will
move quickly sideways in such conditions, and you should
not launch until there is sufficient maneuvering room alongside.
This ability to go sideways is one drawback of shallow
draft, and you should always make allowances when launching/retrieving or under power. First priority at every launch
should be to LOWER THE DAGGERBOARD! This helps to
prevent any sideways movement, and gives excellent maneuverability under power.
The F-31 is a large boat to handle at ramps, but because
of its lightness, it is easy to move around. The trick is not to
fight it, but to plan ahead what you are going to do, and gently
guide it in the correct direction.
An offshore wind at the ramp is ideal, as the boat will just
lie quietly downwind at the end of the bow line. It is just then
a simple matter of boarding over the float bows, and backing
off or just walking her over to a boarding dock, if available.
An onshore wind is the most difficult, as the boat will swing
sideways once launched, and come towards the ramp. In
this situation the boat should be held off the ramp from a
central position on the side. You will find a balance point
where it will lie evenly until you are ready to board.
If a dock is alongside it is a good idea to run a stern line
to the dock, so that the stern can be pulled to the dock after
launching, thus preventing it from swinging around.
A good way of launching in all conditions, if extra help is
available, is for someone on board to start the motor before
launching, and simply back the boat away from the ramp remembering, of course, to drop the daggerboard once clear
of the trailer.
All models are always launched folded, and unfolding can
be done either at the dock, or while motoring away, even in
choppy conditions. Folded stability is very good, but it is
limited, particularly on bigger boats like the F-28 and F31. Always take care in strong crosswinds and avoid fast
tight turns, as it is possible to roll the boat over! If necessary,
immediately unfold at least one side to avoid any risk. The
F-31 also has a secondary wider folded beam of 9' 6" which
improves folded stability, and if you intend motoring very far
while folded, you should use this position.
Always take care in strong winds while fully folded
and with mast up. A combination of a fast tight turn
and mast windage and weight could cause a roll over
in such conditions. If in doubt, unfold one or both
sides to eliminate this danger
To unfold, first check that there are no ropes across the
Page 9
The F-31 - folded stability is very good, but don't push your luck!
Copyright © 1997 By Corsair Marine
Unfolding can be done at the dock or while motoring away.
But beware, while folding stability is good, it is limited.
beam recesses, and the tiller is clear. Remove the beam
locking pins, place your foot on the top of the upper
folding strut, grasp the top of the beam and pull downwards,
while pushing with your foot.
when folding, one person operating either beam is all that is
required. The wingnets will extend and tighten themselves.
There is a knack in unfolding of using both your foot to push
on the upper folding strut and your hands to pull the top of the
beam in and down. After a few tries you will find it easy to do.
The shrouds are now secured correctly to the floats, with
the Link Plate (if fitted) being pinned to the chainplate. The
F-24 Mk II does not require this, as its shrouds can be left
permanently attached to chainplate.
With the F-31 fixed mast, the turnbuckle must be directly
connected to chainplate, and there should be just enough
slack in the wire (but not too much - which can overload
tensioners) to insert the clevis pins. The top shrouds are then
tensioned by the block and tackle tensioners anchored at the
aft beams and attached to the shackle located about 4' up the
top shrouds. Pull these on firmly, checking that the mast is
straight. The first time out, both tensioner lines should be
marked when the mast is straight, as a reference for future
use and adjustment.
These tensioner tackles on fixed masts will need considerable tightening when going to windward in high winds, as
they keep the mast straight and forestay tight for good
pointing ability. Avoid letting the leeward shroud become too
Rotating mast shrouds only need to be moderately tight,
even slightly loose, as a tight rig can restrict rotation.
Once adjusted at initial launching, all turnbuckles can
remain fixed, and should not require to be adjusted during
launching or retrieving. Just the spring clip and clevis pin are
inserted or removed in the turnbuckle toggle or Link Plate.
Once the mast is properly supported by the shrouds, the
mast raising wires can be removed.
The spinnaker pole bowsprit can now be fitted or extended depending on model.
Always check that no one has their foot/hand/fingers
in or near the beam recesses when folding, as the
beams can come down quickly!
The float will unfold, but be careful it doesn’t pick up too
much speed towards the end. Hold the beam down and
tighten the bolts using a speed wrench. These bolts should
be tightened firmly, but NOT OVERTIGHTENED.
The Beam Bolts must always be in place and
tightened BEFORE sailing
If anything seems hard or difficult when folding, STOP
and see if anything is misaligned, or snagged. It is usually a
wingnet catching. Should you have difficulty in holding the
beams down to tighten the bolts, then the usual cause is
wingnets that have been lashed too tightly. These should be
slackened slightly.
It is not necessary to hold both forward and aft beams
Copyright © 1997 By Corsair Marine
Page 10
Beam bolts must always be tightened firmly before sailing
It may be necessary to sometimes launch with the mast
down and raise the mast later. To do this you will need an
additional strong block to attach to the bow roller/stem
fitting. A spinnaker sheet block is ideal. The mast raising
pole/yoke must also be carried on board.
Once in clear water, follow the same mast setup and
raising procedures as listed under RIGGING, but instead of
the trailer winch line, use a line from a sheet winch to the bow
block, and then back to the jib halyard. The mast can then be
winched up. The procedure is reversed for lowering.
F-28 transom hung rudder being lifted up - note how tiller
can give extra leverage by pull up line being cleated to it.
The rudder has 2 control lines, one to pull up and one to
pull down. These are color coded, with red (for danger) to pull
up, blue, for deep water, to pull down. The rudder will kick
back, should it hit bottom hard enough, the pull down line
pulling through the cleat.
At high speeds, the cleat alone may not be enough to hold
the rudder down. In this case, a lock/shear pin can be fitted
through the case and blade as a positive lock down.
The rudder may also have an extra horn cleat on the tiller,
and this should only be used if the hold down cleat is worn,
and the lock/shear pin is not available. Never use the horn
cleat where there is a danger of grounding.
keeping alert, and the boat speed down. The daggerboard is
very strong and will only break off with an exceptionally hard
grounding. Normally you can expect the boat to come to a
shuddering stop, with no damage, should you hit bottom at
speeds less than 6 knots or so. It’s then just a matter of
retracting the daggerboard and continuing on your way.
Even at low speeds, a grounding can cause the crew
to be thrown forward, and care should be taken to
prevent this, or to be prepared for it. Slow Down In
Shallow Water.
The daggerboard case itself is exceptionally strong, and
is not likely to be damaged in a grounding, though this cannot
be guaranteed. Even with a lost daggerboard, your Corsair
trimaran will still be sailable, and will still go to windward. In
this case you should allow her to heel as far as possible,
submerging the lee float to pick up lateral area.
When maneuvering in confined waters always have the
board down. This promotes quick turns, preventing any
sideways motion. In general, the board should always be
down, except perhaps when running downwind in light
conditions. However, no speed advantage has ever been
proven for this, so it is probably easier to just leave it down.
The board should always be half to fully down when
running or reaching in heavy winds or seas. It greatly
enhances directional control, keeping the tiller very light.
Should you at any time find the helm heavy, then the
cause is either, the daggerboard is up, or, the rudder has
kicked back slightly (always watch for this). Another
possible cause can be the mainsail sheeted in too tight (a
common fault). Even in the strongest winds, or the fastest
20 knot spinnaker run, the helm should always be light
enough for easy one-handed control. If not, you should
check for reasons why.
Rig tension and mast setup are very important for good
Like the rudder, the daggerboard has 2 control lines, one
to pull up (red) and one to pull down (blue). The daggerboard
will not kick back, it being designed to break off should it ever
hit bottom hard enough. This protects the daggerboard case
from damage in most cases - a much more expensive repair.
Obviously, one should still be careful around shallow waters,
Page 11
Shroud tensioner system as used on the F-27 and F-31
Copyright © 1997 By Corsair Marine
sailing performance and while rotating masts do not require
much rig tension (to allow full mast rotation), most owners do
not tension fixed mast rigs enough. To avoid this, a simple rig
tension gauge (Loos Type recommended) available at Marine stores can be purchased, and this includes hints on
tensioning your rig. Rigging wire will stretch a little initially
and all settings should be checked after a few sails.
All masts should be set up with some prebend (center of
mast pushed forward). This will range from as little as 3/4"
with Rotating masts (even less with wing masts), to 3 to 5"
with fixed masts. Mainsail should then be cut to suit this.
There is no correct amount of prebend, other than each
mast should have some, and it can be used to control the
mainsail shape to some degree. This means that if the
mainsail is cut for say 3" prebend, less will make the main
fuller for light airs. More, will tend to flatten the main for windy
Prebend in Rotating masts is harder to adjust in this
regard, but the ability to rotate the mast can give an even
greater control over mainsail fullness.
For good windward performance the forestay MUST BE
TIGHT and this cannot be emphasized too much. Fixed
masts can control this by pulling on the shroud tensioners,
and more mainsheet tension. Rotating masts can only increase mainsheet tension, but the superior mainsail shape
due to the rotating mast, more than makes up for this.
An important rule, vital to the well being of all masts,
particularly fixed masts, is to be sure that your leeward cap
shroud never becomes TOO LOOSE. Some looseness is
not unusual, but if it is very loose and visibly flopping around,
you could risk losing your mast.
To tighten the shrouds on a fixed mast while underway,
you can use the spinnaker winches on the tensioners, or else
snug up the leeward tensioner a set amount to just remove
any slack. Now tack and pull on the other side an equal
amount. It is easier to tension the leeward shroud rather than
the windward one. On the F-31 fixed mast the top shroud's
tension in heavy weather should always be 2500lbs or
more.......... Don’t forget to relieve this when not sailing.
This manual is not intended to be a Sailing Instruction
Manual, and it is presumed that all owners will have a
basic sailing knowledge and skill. There are however,
many aspects of sailing a Corsair trimaran efficiently, and
the following covers some of these:
The mainsail is usually hoisted first. Turn directly into the
wind and commence pulling on the halyard. You may find
winching necessary to get the main fully up, and if fitted, use
the jib halyard winch. If the boom roller furling system is fitted,
the main will automatically unroll from the boom. Winch the
halyard tight until all the wrinkles just disappear from the
mainsail luff, no tighter, and lock the halyard with the rope
clutch. The topping lift can now be eased.
All models sail and tack easily under mainsail alone. If you
have a lot of tacking to clear a channel then it may be much
easier with just the main. You don’t have to worry about
tacking the jib, you won’t be going too fast, particularly in
crowded waters, and visibility is excellent.
The correct technique for sailing mainsail only is to sheet
it free to avoid choking the boat. The traveller can be locked
on the centerline, and the mainsheet slackened off so the
boom is about 12" out from center. Your boat speed should be 5
- 6 knots in 10 to 15 knots of wind,
even better with a rotating mast.
If you find boat speed is less,
then the problem is an oversheeted main or trying to point
too high.
There is a technique involved
in sailing main only, and once
learned how, it is a very relaxed
form of sailing. The secret is to
keep the main eased out more,
particularly after a tack. Don’t try
to point high until boatspeed has
built up.
The jib halyard can now be
connected and the jib hoisted.
Tighten until the wrinkles just disappear from the jib luff, using the
halyard winch if needed. There's
no need to go any tighter. As the
wind increases you will find the
An F-28R with furled asymmetric spinnaker
halyard will need tightening,
Copyright © 1997 By Corsair Marine
Page 12
Boom vang and Cunningham eye controls on an F-27
When reaching, the headsail
shape can be improved by using
a barber hauler. This is a line
hooked to the headsail clew, and
led to a block attached to an eye
on the float deck and then back to
a camcleat on the cockpit coaming. Two barber haulers give a
wide range of sheet adjustment.
One can also be used on the
boom to hold it down while running or reaching. This is much
more efficient than the traditional
boom vang and a good safety
feature to prevent an unexpected
For the best performance while
running, weight should be kept
forward. At least one crew member should sit on the main hull
bow when racing downwind. This
reduces wetted area and can
make a significant difference.
again, just enough to just get the wrinkles out. Sheet the jib
Several different reefing systems can be fitted, and all the
and you are sailing!
control methods are well documented. The roller reefing
If available, two additional controls may be added to the
boom as used on the F-28 and optional for the F-31 is a very
mainsail at this stage, these being the boom vang (fixed
effective reefing system, being fast, easy to operate, and
masts only) which just snaps on, and the Cunningham eye
infinitely adjustable. It’s other main advantage is the ability to
tackle. A 4:1 fiddle block with cleat is snap shackled to the
easily roll up the mainsail for storage.
mast step, and the line from the top fiddle block is passed
To reef, first disconnect the boom vang (if fitted) and
through the Cunningham eye on the sail and hooked to the
Cunningham eye tackle. The topping lift should also now be
horn cleat on the side of the mast. This gives an 8 : 1
purchase, and should be adjusted to just remove the wrinkles
from the mainsail luff. Neither of
these controls are essential for
everyday sailing, their main purpose being to give more efficient
control over the mainsail. Both
must be removed when roller
Corsair trimarans are sailed
like any other yacht, the most
notable differences being the response, lightness of the helm,
and the low angle of heel. This
ranges from an average of 5 to
10 degrees to a maximum of
about 15 degrees.
Pointing ability is excellent,
but care must be taken not to
oversheet or try to point too high.
Just a few degrees less pointing,
with sheets slackened slightly,
can see boatspeed jump from 6
Jib barber hauler in use on an F-27 - will considerably boost performance
or 7 knots to 9 or 10 knots.
Page 13
Copyright © 1997 By Corsair Marine
To reef, disconnect line from cleat,
unthread from clew eye, and
rethread through new reefing eye.
More line will be required and this
comes from the excess on cleat
Reefing eye should
also be lashed around
Rolled Main
Wrap excess line around cleat so that line
emerging from camcleat is not too long.
Eye line
used to lift the back of the boom a couple of inches above
horizontal. This stops the main from creeping forward to bind
against the mast when furling. This may not be required,
depending on the cut of the mainsail.
Now take the main halyard around the winch and release
the rope clutch. Go forward with the halyard held in hand,
unlock the furling handle and begin turning. As the main is
rolled down, let the halyard slowly run out to suit. When the
main is rolled up sufficiently, lock the furling handle, let off the
topping lift, return to the cockpit and retension the halyard.
Reefing is complete.
You should always try to locate the head of the reefed
mainsail close to or just above a staying point, rather than in
the middle of a mast panel. This avoids unwanted bending
loads on any unsupported mast section.
As mentioned previously, if you find a problem with the
mainsail rolling up close to and jamming against the mast,
this is usually caused by not lifting the end of the boom
sufficiently with the topping lift.
You may also find it easier to regulate the speed at which
the halyard runs out, as you wind the boom, by using the ball
of your foot on the line just before it enters the mast.
The boom vang cannot be reconnected, but with the
barber hauler system available, if needed, from the floats,
this is not of any importance.
A Jiffy reefing system may also be fitted, in addition to the
roller furling boom, and this can give slightly better sail
control for better sailing efficiency.
Copyright © 1997 By Corsair Marine
Page 14
Main neatly roller reefed. This F-27 is heading for Hawaii
from San Francisco
To use, simply roller reef as described above, but only roll the main
up until the selected jiffy reefing points
are reached (two sets usually included
as standard). Lock the furling handle
as before, and then reattach the Cunningham eye tackle to the reefing tack
Now unthread the outhaul line and
rethread it through the new reefing
clew eye. All the controls of a jiffy
reefing system are now in place, except you don’t have to tie off the sail it
being already neatly rolled around the
boom! It is advisable to take a line
from the Cunningham eye forward and
around the mast. This avoids the possibility of the bolt rope pulling out of the
mast groove.
F-28 Mainsail being roller furled. Note foot being used to control halyard.
The correct rotation of a rotating
mast will give a much more efficient
and powerful mainsail. It is thus important that the rig not be
lines to the deck, one from each side for absolute control, but
set up too tight as this can prevent full rotation.
this can also be just another complication and is not necesThere are many opinions on what the correct amount of
sary for general sailing.
rotation should be, but a general guideline is to keep the mast
rotated enough to give a smooth, even, transition from the
All Corsair models will point very high if set up and sailed
mast to the mainsail on the leeward side.
correctly, but this can also be very dependent on the crew’s
The amount of rotation will depend on the type and shape
skill. It is possible to point just as high or higher than an
of mast, and can range from 35 to 90 degrees from the boat
equivalent monohull, but this may not be the fastest way to
centerline. A good rule of thumb is for the mast to be rotated
windward. A good multihull is capable of much higher speeds
around 40 degrees more than the boom.
to windward than a mono, which also brings the apparent
wind forward, to where pointing will be lower, but the resultant speed to windward is much greater.
One thing to avoid is over sheeting the headsail, as while
pulling this on very tight will guarantee a good pointing angle,
the boat speed may be slow. The correct way is to let the
sheet out 1 - 2 “ from being tight on, so that the curve of the
Avoid allowing the mast to rotate or swing back and forth,
which can happen in light winds combined with waves, or
when sailing off the wind with less sail pressure. This is
usually prevented by having the mainsheet angled forward
from the boom, which forces the boom forward to keep the
mast rotated when pulled tight.
The amount of mast rotation is controlled by a line to the
rotation arm on the mast from either the boom or the deck.
A line from the boom has the advantage of being self-tacking,
by maintaining the mast at a constant rotation angle relative
to the boom on all points of sail. However, the control line will
have to be detached from a roller furling boom and transferred to an eye on the deck when furling the main.
A control line from the deck is also self-tacking, but it does
not automatically adjust for different angles of sail. It will thus
need to be let out when bearing off. Some racers like to fit two
Page 15
F-28R Mast Rotator Arm
Copyright © 1997 By Corsair Marine
Achieving good windward performance can be very satisfying, but it does depend on a lot of factors being right. Screacher
can be left up permanently as shown on this F-28R
headsail leach matches the curve of the mainsail. It should
then not backwind the main, and your pointing angle and
boatspeed should both be excellent.
Once you have achieved good boatspeed, then experiment by tightening sheets very slightly, pointing slightly
higher, while trying to maintain the same boatspeed.
The mainsail traveller should be around 6" to windward in
lighter conditions, then around the centerline in moderate
winds, and as the wind increases, moved outboard slightly
and more mainsheet tension applied. In very strong winds
the mainsheet should be pulled on as tight as possible. Stand
above it and pull it on as hard as you can - most sailors don't
have this tight enough in strong winds. A tight mainsheet
helps keep the forestay straight for good pointing ability.
If the jib is backwinding the main, open the slot, by
moving the traveller a little more to center. Keeping an open
slot between jib and main is crucial to good windward
performance, as any back winding of the main will choke the
boat. Equally as important, the jib must be relatively flat with
NO HOOK in the leach, and not oversheeted. Leach battens
are highly recommended to keep the leach flat.
If set up and sailed correctly, a Corsair trimaran will match
the windward ability of the best monohull racers, 20 to 30%
larger. Pointing high and going fast is one of the hardest
Copyright © 1997 By Corsair Marine
things to achieve in any boat, but with a little care and tuning
a Corsair is one of the best.
When reaching, it is vital that the mainsail be let out far
enough. A common mistake is to sheet it in too tight, with loss
of boat speed, a heavy helm and an excessive heel angle.
Your mainsail should have leach tell tails fitted as standard. Watch these, and should they disappear behind the
mainsail to leeward, then you are sheeted in too tight. They
should always be flowing aft.
In light winds the mainsheet system can tend to bind and
be hard to let out. To overcome this there is sometimes a
lever on the side of the camcleat block that disconnects the
ratchet. The mainsheet system will then run out easily.
The headsail should also be barber hauled out to the
floats when reaching. This is used to get the perfect shape
in the headsail (so that it doesn’t backwind the main), and will
boost reaching performance significantly.
Page 16
This is an optional roller furling wire or Kevlar luff
combination genoa/reacher, flown from the spinnaker
bow pole. The spinnaker halyard is used on the F-24,
while a separate dedicated halyard is used in both the
F-28 and F-31R. This allows the screacher to be
always left up while furled, ready for instance use.
This multipurpose sail can be a perfect all-around,
first choice, additional sail for cruisers, or an essential
powerhouse for racers. It is still a developing sail in
many respects, and offers some significant and worthwhile advantages.
It can be used very effectively to windward in light
airs, and for reaching in moderate airs. It thus eliminates the regular hank on genoa, while providing more
sail area, and it is easier to change headsails. The jib
is just dropped and the screacher unfurled when required. Sheeting is to a simple strap around the aft
beam, which can be moved in and out for the correct
sheeting angle.
For the best windward performance, it is very important to keep the luff tight, and many racing owners have
even fitted 2 to 1 halyards to keep the clutch loads
Screacher being used to windward - makes a great all-around sail
for cruisers. Easy to use, and easy to put away.
lower. However, the risk of twist when hoisting can then be
higher, and cruisers will usually not experience the sort of
high loads that some hard racers can induce, in the search
for the ultimate performance.
The screacher can be tacked easily when needed by
rolling up and then unrolling on the new side.
The spinnaker is a very easy sail to use on a trimaran, due
to the wide beam and level sailing. The spinnaker thus
becomes a very practical and safe sail for family sailing, with
very few control problems. The F-24, F-28 and F-31 now only
use asymmetric spinnakers, which are the easiest to use,
and the fastest if used correctly.
The asymmetric spinnaker can be launched from the
leeward wingnet, or main hull bow, and the sheets led back
to blocks on the floats near the aft beams for general all round
performance. For better pointing ability, particularly when
tacking downwind, a closer sheeting angle is better, and the
ideal position will vary depending on spinnaker. A block on
a movable strap around the aft beam gives plenty of options
in this regard.
The tack line is led from a block at the end of the pole back
along the main deck to a cleat on the cabin roof at the aft end.
To set, connect tack line, sheet, and halyard. Pull on tack line
until tack is at the end of pole, hoist and then sheet in.
Asymmetric spinnaker on an F-24 Mk II being raced very
hard. Note the extra long tiller extensions each side rigged
up by these Australian skiff sailors, which are held in place
by shockcord to the aft beams. Works very well.
The asymmetric spinnaker can be jibed either through
inside in front of the screacher or forestay, or around the
outside. With 'inside' jibing the sheets are run between the
spinnaker tack and the screacher if fitted, forestay if not.
Outside jibing requires the sheets to be run outside the
spinnaker tack.
Inside jibing is probably the most common, as outside
jibing does have the risk of a sheet going under the boat,
Page 17
Copyright © 1997 By Corsair Marine
Asymmetric spinnaker on an F-28R. Jib can be flown inside by racers as shown for better performance in light airs
though this is lessened by using a continuous one piece
sheet. The advantage is that the sail does not have to fit
through the narrow slot between spinnaker and screacher.
With inside jibing, the skipper should start turning
slowly while the crew eases the sheet to keep the sail full.
As the clew nears the slot, or the spinnaker starts to
collapse, the new sheet should be quickly pulled in to pull
the spinnaker through the slot and around, while also
releasing the old sheet.
Outside jibing procedure is similar, with the crew
waiting until the clew reaches just in front of the headstay,
and then pulling in the new sheet, with the sail going
around the outside.
In all cases it is very important that the skipper turns
slowly, and then heads up to fill the sail before coming to
the right course.
On first using an asymmetric spinnaker you may be
disappointed with downwind performance with a fixed mast
- unless you take note of what is said here. The asymmetric
cannot match a full symmetric spinnaker straight downwind
because of the smaller, flatter area, and a restricted ability to
Copyright © 1997 By Corsair Marine
project to windward. The major advantage is considerably
easier handling, and a superior reaching performance.
Tacking downwind does not work well with fixed masts, as
the mast interferes with mainsail flow, and the main is thus
not very effective. A rotating mast is much more efficient and
such boats can achieve a very large performance increase,
making downwind tacking the fastest way to go.
However, the same effect can be achieved with a fixed
mast by using the jib inside the spinnaker which, besides
increasing area, helps smooth the flow over the mast and
main with spectacular results.
The basic technique/rule is to sail downwind while keeping
the apparent wind at about 90°, trimming the sails so they are
not stalling or luffing. The jib, for instance, should be sheeted
to the float just aft of the forward beam. The extra speed
generated will pull the apparent wind further forward, allowing you to go deeper and deeper while maintaining a very
high speed. Just keep the apparent wind at around 90°. It can
be tricky to get the right angles, but if done correctly, the
results can be devastating. So try it! Flying the jib inside the
spinnaker may also help improve performance with a rotating mast in light winds.
Page 18
Be fully aware that it is possible to capsize
any multihull and the following rules should
always be observed for safe sailing:
1. Reduce sail early as follows:
a. Genoa/screacher should be replaced by jib in windspeeds
greater than 12 knots.
b. Main should be reefed to first set of reef points when wind
reaches 20 knots.
c. Main should be further reefed to second reef points when
wind reaches 25 knots.
d. In winds over 35 knots main should be roller reefed to 4th
batten from the top and jib replaced by storm jib
e. Over 50 knots, main should be furled more, or completely,
leaving only the storm jib.
If necessary, all sail can be taken off and a properly set up
Storm Parachute Anchor put out. This is now a well proven
method for a multihull to survive even the worst offshore
storm. It appears to virtually eliminate the danger of capsize
from both extreme wave action and hurricane force winds.
Other variations of the above are possible depending on
the circumstances. Experienced and alert racing crews can
delay reefing to even well beyond the above limits.
A quick way to reduce sail, and achieve a very comfortable and safe motion is to simply drop the jib and sail under
main only, reefed if considered necessary. This avoids the
need to tack the jib, and the fully battened main remains
docile and easy to handle.
Sometimes, when running downwind, it is better to drop
the main and run under jib only. Corsair built trimarans can
go to windward and tack while sailing under either jib or
mainsail alone.
2. When winds are strong and gusty, and the boat is being
sailed hard, then always have the sheet of the largest sail
up, be it the mainsail, genoa, or spinnaker, in hand,
ready for quick release. Use only the camcleats provided
and never use self-tailers as cleats in high winds - they are
too difficult to release fast.
Always be ready to release the sheets if you feel the boat
is being pressed too hard. Instruct your crew to do likewise.
If concerned, then just reef until you are comfortable.
This is definitely not safe sailing with a novice crew aboard! The F-27 shown is sailing in 30 knots with full sail, and an
experienced crew. Boat speed reached 23 knots. Note how the main hull bow stays high, while the boat planes on the aft
sections - this is an important safety characteristic of all Farrier designs. It is very hard to bury the bow. DO NOT do this sort
of thing with your family on board. To be safe, always reef early.
Page 19
Copyright © 1997 By Corsair Marine
For safety, always wear a life jacket, and, when sailing hard, always keep the sheet in hand ready for instant release
Never leave the sheets unattended, if un-reefed and
the wind is exceeding 20 knots.
If being pressed while reaching then it is better to bear
away downwind than round up. The boat will slow down,
and the mast momentum from the turn is to windward,
reducing heel. Round up and speed may increase surprisingly, while mast is thrown to leeward, heeling the boat more.
The only time to luff up is while hard on the wind (do not
bear away in this case), feathering the sails until any gust
passes by.
In general, your visual indication of being overpowered is
when the leeward float is pressed far enough down to have
waves regularly wash over it. If cruising with your family, then
you should reef before this for the best comfort. If sailing for
speed, this is not of great concern, providing the crew is
vigilant, and this sort of sailing has been done for hours at
very high speeds.
It is not unusual to drive the low resistance float bows
through waves, or even submerge the float in some circumCopyright © 1997 By Corsair Marine
stances. This has been found to have no adverse effect on
the boat, and in fact the boat will tend to round up slightly, not
slew to leeward as commonly and mistakenly believed. Early
Farrier designs used low buoyancy floats, and frequently
completely submerged the leeward float, with speeds in
excess of 15 knots, for quite some time, with no ill effect on
the boat. However, this is sailing on the limit, and don't push
your luck unless prepared for a ducking.
3. Beware of being caught side on, with little speed and with
all sails sheeted in tight. This can happen after a tack if
concentration is lost.
4. If caught in a severe thunderstorm, a simple safety
procedure is to drop all sail and simply let the boat drift. You
will lie side on to the wind which is quite safe, unless the
waves are very large, in which case you should steer off
downwind. Corsairs will steer quite well from a reach to a run
with no sails up in any winds over 5 knots - try it sometime.
It is even possible to round up into the wind.
Page 20
5. Another safety procedure in a severe storm is to simply
drop all sails and anchor, which is probably not used enough
as a safety procedure. It is very effective. At sea a Storm
Parachute anchor has the same effect.
6. Always listen to the latest weather forecast before you set
out on any sailing trip.
7. Always leave yourself a large safety margin, be it while
sailing, or simply motoring around.
8. Always carry full safety gear, including life jackets, as
required by U.S. Coast Guard and local regulations.
The above procedures will give a high margin of safety and
should always be observed whenever safety is paramount.
If absolute performance is required, and an experienced
crew is aboard, the above limits can be comfortably exceeded. In some earlier sea trials full sail has been carried in
over 40 knots of wind, including the spinnaker. This is not for
the inexperienced however, and any skipper doing such
sailing must be prepared for and accept the responsibility for
the extra risks involved. It should not be done offshore.
Corsair trimarans have several unique sailing features,
one of these being the ability to make continuous 360 degree
turns in the one spot. To do this, while going to windward for
instance, just tack, but don’t touch any of the sheets. You will
continue to turn, jibe, and tack again indefinitely. Can be a
handy tactic on starting lines.
A simple way of heaving to, is to just tack as above, but
immediately put the helm over to turn back into the wind, with
the jib sheeted on the windward side. This prevents tacking
again and the boat will instead fall off. The rudder then takes
over again and turns the boat back into the wind. You will
then stabilize like this, just off the wind, moving forward very
slightly. The helm can be lashed over and you now have a
stable, barely moving work platform to do any needed
repairs, stop for lunch, or just wait for someone else to catch
Should you ever loose the rudder, for whatever reason,
don’t despair. Among the repertoire of tricks is the ability to
sail without the rudder. It takes a little practice to get right, and
it is worth practicing sometime. Pull the rudder fully up (first
making sure you have plenty of room!). Now, to go to
Set up and sailed properly, a Farrier design is a very safe, yet very fast boat. This F-31 is powering into 25 to 30 knot
winds, with a single reef. Speeds of around 11 knots to windward are possible in such conditions
Page 21
Copyright © 1997 By Corsair Marine
When seeking the best performance, keep things in perspective - there will always be some boats that will be faster...
Sir Peter Blake's 60 foot trimaran Steinlager and an early Farrier design - the Trailertri 680.
windward, you sheet the jib or genoa as per normal but let the
main right out. Pull the main on slightly and you will begin
moving. Pull the main on more and you will come higher, let
it out and you will go lower. Pull the main hard on and you will
tack. Immediately let it right out until you stabilize on a reach,
and then start pulling it in until you are going high again.
This takes a bit of practice to get it right, and for a time you
will be all over the place, but after a while you should be able
to work your way to windward, tacking too, just by adjusting
the mainsail.
You can also sail surprisingly effectively without any sails.
The mast alone is sufficient to get steerage way downwind,
and once moving you can bring her up on to a reach, even
back into the wind. This can be a handy feature for coming
into a ramp or dock at a greatly reduced speed.
Another feature is the ability to back up. This takes a bit
of practice, but by turning into the wind, and waiting until she
starts going backwards, you can control this backing for as
long as you want. Just steer the rudder whichever way you
want to go. Can be useful in backing off a beach, or away
from a dock - just let her go back, swing around once in clear
water, and then accelerate away.
The high potential speeds possible with rotating masts off
the wind can be intimidating to new multihull sailors, and, if
necessary, the potential speed can be reduced to a more
Copyright © 1997 By Corsair Marine
comfortable level by reducing sail or by under rotating the
mast, which depowers the mainsail. More rotation can be
used as one becomes comfortable with the speeds possible.
When spinnaker running before very large seas offshore,
with boat speeds of 20 knots or more, there can be a danger
of pitch poling. This can be caused by pressure from the
mainsail which cannot be released downwind should the
bow dig in. The solution is to drop the mainsail, which
virtually eliminates this risk. This rule only applies to racers,
as cruisers should have reduced sail well before this even
becomes a danger.
The limit for racers with modern rigs will always be nose
diving, though this is hard to do with a Farrier design, due to
their characteristic 'high bow' sailing stance. The F-28, for
instance, at speed, frequently has the complete center hull
bow section out of the water, the waterline beginning just in
front of the daggerboard. This comes from the wide flat swept
up aft sections of the main hull which generate negative lift,
actually sucking the stern down.
This characteristic can be maximized when needed with
high speed racing downwind, by moving the crew inboard
and aft to the back of the cockpit. This keeps the flat aft
sections of the center hull in the water and the bows very
high, by increasing the negative lift at the hull aft sections.
This works most effectively on aft cockpit rotating mast
Page 22
boats, where the heeling component of the sails is less than
the fixed mast, the drive being angled more forward.
Also important for the best performance, by minimizing
wetted surface area, is to move crew weight well forward in
light to moderate winds, to keep the bows down, countering
the stern negative lift.
The boat should also be heeled to leeward (crew on
leeward side) when sailing to windward in light winds, just as
with a mono. This keeps the sails in a more efficient shape.
Trimarans tend to be lively at anchor, due to their light
weight and shallow draft. They like to sail from side to side,
which can be annoying. This is simple to overcome by using
a bridle setup to each float bow. These have eyes fitted as
standard, for a block to lead the bridle lines aft.
When anchoring, just lay out your anchor as per normal,
over the main hull bow roller. Set up the rope bridles, running
through the blocks on the float bows and back to the
spinnaker coaming winches. Bring the 2 bridle lines together
in the center of the boat and attach to the anchor line. Let the
line out further until the bridles take over the load. You will
then have a well behaved boat.
into a beach. You can either pull in far enough so that the boat
cannot move around (which can wear out your expensive
bottom paint) or anchor just far enough out so that the boat
remains floating in 2 or 3" of water.
After sailing is finished, the jib is dropped and the mainsail
is roller furled or folded. Remember to lift the boom aft end
as required with topping lift for smooth roller furling. Once
fully rolled, you should then hold the mainsail with one hand,
and reverse wind the boom with the other. This loosens the
tightly rolled main, preventing any wrinkles, and relieves any
bending force on the battens.
The floats can be folded before arriving at the ramp for
reduced beam, and this also allows the float bows to be very
useful step-off points, if needed. Use the secondary wider
folded position on the F-31 if windy and there is still some
distance to the ramp.
Prior to folding, with all rotating masts, the mast raising
wires must be fitted.
Rotating masts must be supported by raising wires
before disconnecting shrouds, or mast could fall
One major multihull advantage is the ability to come right
The advantages of a multihull with shallow draft can be easily seen. Sometimes you don't even need to anchor. Just pull up at
the nearest beach - an F-27 in Japan.
Page 23
Copyright © 1997 By Corsair Marine
To fold, disconnect the shrouds from the float chainplates
(not required with F-24). The shrouds are then retained to
the float by the Link Plates with rotating masts, which give
just enough slack to fold, while preventing the mast from
falling should the mast raising wires be forgotten.
The F-31 fixed mast version will require that the shrouds
be completely disconnected from the float, and they can then
be secured to the mast with velcro straps. This stops them
from flopping around. An alternative is to attach them to the
float deck just behind the forward beams. This keeps them
from moving, yet allows the float to fold up.
Before folding, first check to see no one is on the side
being folded, and then undo the beam bolts. The beams on
the side first released may spring about 12" into the air as the
last bolt is undone. Hold the top of the beam and lift upward
damage the stops. You will have to slow it slightly. Insert the
beam locking pin. If the float does not fold in fully, the usual
cause is the wingnet catching on the aft corner of the cabin
side rail. To correct, just push the wingnet down under the
cabin side rail.
Take great care while folded in winds of 25 knots or
more. A combination of a high cross wind and a fast,
tight turn, may be sufficient to overcome the folded
stability of bigger designs, resulting in a roll over.
Now fold the second side. You may find this initially more
difficult, as the boat is heeled this way, due to the first float
folded lifting that side. Crew weight on the already folded side
will help by levelling the boat out more. Lift, and once again
don’t let the float come in too fast once it starts moving. Insert
the beam locking pin.
If anything seems hard or difficult when folding, STOP
and see if anything is misaligned, or snagged. A common
error is to try and fold without disconnecting the shrouds. The
beam won't budge, so remember to check this.
Raise the daggerboard and rudder, and cleat both in the
up position. You are now ready for the trailer.
If there is a cross wind at the ramp, then a Side
Guide Rail should be fitted to the leeward side of the
trailer. This will prevent the boat swinging sideways
and off the trailer.
Back the trailer down into the water until the water
reaches the forward inward bend of the trailer side
members and the float supports are just visible above
water level. Don’t submerge the trailer any further than
this. Gently guide the boat into the center and pull up as
far as it will go. Take care here, that it comes on straight,
and avoid pulling it over the center hull side supports,
as this can damage the Log paddlewheel sender unit
on the bottom of the hull (gets expensive to replace).
A side line from the windward aft cleat may also be
helpful in cross winds to prevent the stern swinging too
far sideways.
If motoring onto the trailer, leave the daggerboard
down until the last minute - otherwise any crosswind
makes it very difficult to keep on center. Once fully on,
connect the trailer winch hook, and winch on the
remaining few feet.
The boat can now be pulled from the water, and
when on level ground remember to check that it is fully
winched on. Once out of the water there always tends
to be some slack in the winch wire. Tie an extra safety
line from the bow eye down to the winch post, ready for
F-28 Shroud disconnected, and being restrained by link to give just
enough slack for folding. Mast raising wires must be fitted prior to
disconnecting shroud (can be seen in background).
Copyright © 1997 By Corsair Marine
Page 24
Remove the bow line, separate the two lines, and
use as the side tie-downs. Fit the aft mast support and
the trailer lights.
Remove the jib and fold. The jib sheets can be
stowed in the anchor well ready for instant use next
time. If possible, the jib can be stowed inside one of the
reaches the aft mast support.
CAUTION: If your trailer winch
does not have an automatic brake
feature, don’t let go of the winch
handle while lowering. Should
this happen it will start spinning
very fast and could cause injury.
Don’t try and stop it - except by
using the winch brake. DON’T
try and grab the handle - you
will just have to let the mast fall better than a broken hand.
Once the mast is fully down,
disconnect the winch hook, reconnect to the bow eye, and retension. The jib halyard is then
reconnected to the mast.
Disconnect mast from the step,
and lift it up to enable the wind
indicator to be removed from the
masthead. Walk the mast forward until the mast can be
This is about the right position for the trailer when retrieving
mounted on the pulpit's lift up
spigot (in roller furling shaft hole)
floats - thus keeping it from cluttering up the main cabin.
or rested on the carrier on the pulpit.
If possible, relieve the tension on the battens, and these
Secure the mast to the pulpit and aft mast support. All
can be left in the loosely rolled main. Remove the roller
rigging wires and stays should now be secured to the mast
furling handle (if fitted) and stow in the anchor well. Leave the
with the Velcro ties. This is to prevent them from rubbing on
topping lift on, to take the weight, and disconnect boom from the deck which will quickly wear through any gelcoat or paint.
the mast. Lay it down on the cabin roof to one side and fit the
On long trips it is also a good idea to pad between the wires
sail cover/bag. Disconnect the topping lift, and reconnect to
the mast.
The boom/mainsail is heavy on the F-28 and F-31 and
hard to handle. It can be stowed in the cabin if you wish, but
this takes considerable effort, and room inside. It is much
more convenient to stow it on the cabin roof, where it is
protected by its bag and is ready for instant use next time.
To lower the mast, release the jib halyard from the rope
clutch, turning block and mast base block (if necessary) and
cleat it to a horn cleat on the mast side. Release the trailer
winch hook, pass it over the bow roller and hook to the jib
halyard. Tension the winch until the forestay just becomes
slack, allowing the pin to be removed. There is no need to
slacken the turnbuckle.
Take the forestay back and secure to the mast. Remove
all halyards etc. from the rope clutches and blocks as
required. Wrap these around the mast to retain all stays and
halyrads neatly against the mast. It is important that this is
done now, otherwise when lowering the mast any loose
stays will tend to fall away over the boat. It also makes
subsequent rigging easier.
Fit the mast raising pole/yoke assembly, and begin lowFitting an F-28 Mast to pulpit. All such masts with roller
ering the mast by letting out the trailer winch line. The raising
furling fit on a vertical 'swing up' spigot on the pulpit. Mast
wires must be fitted with rotating masts. As the mast
raising pole yoke can be left on mast as shown if wished.
comes down, take care that the winch line meets the center
Note also rotator position - folded up against mast.
of the raising pole, and that the mast is central when it
Page 25
Copyright © 1997 By Corsair Marine
and the mast, or remove the wires altogether.
Do not use elastic cord type ties on the mast, with
hooks, as they can be dangerous by whipping back
and causing eye damage.
Rudder should be fully up, and tied to one side. Should
local regulations not permit the rudder to be left on the
transom, it should be removed and stowed in the towing
vehicle. If fitted, secure the pop-top down, or it could lift up
during high speed towing.
Connect the trailer lights (making sure they are on the
correct sides) and then check that the trailer is correctly
positioned under the hull. You are now ready for the road.
Should there be no ramp present, then all Corsair models
can be quite safely lifted in and out by the usual dockside lift,
using the optional and permanent Lifting Eyes.
Slings can also be used around the complete folded craft,
the best bearing areas for the slings being the beam areas.
Other temporary lifting points are the mainsheet traveller
(outer corners), shroud chainplates on the center hull (when
fitted), or the beam bolt pads in the beam recesses.
For marina docking, the shrouds are released from the
floats and the floats folded as normal. The marina slip can
then be entered and the folded boat moored as with any
other craft. However, care must be taken if high cross winds
are a possibility, as folded stability is limited. Precautions
include running a line from the mast to the dock on each side,
a wider folded position, or lowering the mast in extreme
conditions. Folded stability without the mast is very good,
and the folded boat can actually self right up to even a 80 to
85° heel angle.
One problem with marina docking is oil stains or growth
on the lower float sides. This is not a major problem with short
stays in a slip, but will be a nuisance over a long period.
There are several ways to overcome this, one being the
use of an antifouling wax on the float sides. Thus the
gelcoat finish is preserved and only an occasional wipe is
needed. Antifouling paint could also be applied to the float
sides but this is not attractive, it needing to be 2' 6" wide.
One of the best and recent solutions for long term Marina
docking is a dock liner, which surrounds the boat with
sterilized water, preventing growth.
* * * * * * * SAFETY * * * * * * *
The modern trimaran with its enormous stability and
unsinkability is a very safe craft, and has now established an
excellent safety record. However, this safety is dependent
on the operator and how the craft is handled.
The major hazard to be avoided is capsize, and a few
simple rules make this virtually impossible. Capsize is rare
This is not a safe angle of heel - go this far and you are probably gone! This F-27 is being pulled over to test stability.
Copyright © 1997 By Corsair Marine
Page 26
with well sailed cruising
multihulls, but can occasionally occur with racers
pushed to the limit - just
like race cars. The important factor, as with a car,
is that the degree of risk is
up to the driver/skipper.
Drive/sail too fast for the
conditions and the risk of
a crash is higher. The
decision is yours.
It is not taken away
from you by a heavy keel
below, making it impossible to go fast. Nobody
seriously suggests weighing down a car to prevent
a roll over, nor should a
sailboat be weighed down
to limit performance, just
because a few may not
have the maturity to sail a
Even when fully flooded, a Corsair will stay afloat easily. This F-27 was deliberately flooded
fast type of craft safely.
in order to demonstrate its unsinkability.
Thus, like a car, a multihull has the capability of
very high speeds when desired, and the risk factor can
coverage is not available for any boat undertaking any
consequently be higher. The choice is yours however, as it
passage offshore longer than 200 miles.
is not compulsory to go fast. In general, the risk factor will
only begin to increase when boat speed exceeds 15 knots
* * * * * * * * * * * * WARNING * * * * * * * * * * *
while reaching, or about 8 knots to windward. When sailed
for the conditions, or with safety in mind, Corsairs are the
This is the ultimate safety feature for any boat. All Corsair
models are unsinkable, being constructed almost comVOYAGE AND ANY OWNER TAKING A CORSAIR
pletely in foam/glass, with multiple watertight compartments.
With no heavy keel, it is therefore immune from sinking, even
with all watertight compartments flooded. No matter what
happens, you can be assured that your Corsair will always
It is not within the scope of this manual to go into all the
be there, and will never go aground in 200 feet of water!
equipment for offshore sailing, this being covered
There are up to 12 watertight compartments, depending
available books, and/or offshore safety
on the model, including:
items are an underwing re-entry hatch,
Floats: 3 compartments each.
and a properly set up STORM PARAForward berth: an important factor against collision.
CHUTE ANCHOR. The parachute anchor is a recent develThe four beams: up to 170lbs buoyancy each
opment for multihulls and offers a very comfortable and safe
method for surviving severe storms.
All Corsair models have been designed strong enough for
heavy weather sailing, and both the F-27 and F-31 have now
crossed both the Atlantic and Pacific Oceans many times.
Capsize is always a possibility, even if a remote one, and
However, it should be noted that they are small boats for
should it ever occur, stay calm, and make sure all crew are
such long offshore passages, and for this reason such
accounted for. Anyone inside can stay there, it being safe for
voyages are not recommended.
some time. There is no danger of sinking.
Due to the considerable wear and tear that can result from
When sailing offshore the following items should always
such voyages, and the many unforeseen hazards, warranty
be stored in the safety compartment (accessible from underCORSAIR MARINE, Inc.
Page 27
Copyright © 1997 By Corsair Marine
neath if capsized), with lanyards attached, and in watertight
EPIRB unit
Cutting Tools
Extra wrenches & tools
Bolt Cutters
Spare Beam Bolt Wrench
VHF Hand Held Radio
Copy of Righting instructions Flares
Surge is the major enemy inside the boat, and the first
priority should be to seal all hatches, vents etc. and try to
keep the boat dry as possible. Pop-top will remain in place as
this will try to float upwards. Main battery switch should be
turned off and all loose objects stored in the cabin settees,
these now being above water. Surge will otherwise remove
everything. Water level while inverted is around the bottom
of the beams - float decks are only just immersed.
If possible, the battery should be removed as it will
discharge under water. It should be a sealed unit thereby
eliminating the danger of acid or gas.
If offshore, the crew outside can use the recommended
re-entry hatch to shelter inside, or if not fitted, obtain a cutting
tool from the safety compartment, (accessible while inverted) and cut an access hole into the hull under the cockpit
storage lockers.
You now have a large, relatively comfortable life raft, and
well stocked with provisions. Much better off than in a small
liferaft with minimal provisions. In fact the record for the
longest survival time adrift at sea is now held by the crew of
a trimaran capsized off New Zealand in 1990. They were in
such good condition when rescued that their story was first
believed to be a hoax. The same year an offshore racing
monohull disappeared off Australia, taking 6 lives. Had they
been on an unsinkable trimaran, the crew may have survived. Modern satellite position indicating systems now offer
very quick and easy location for a floating, but disabled
multihull, whereas a sunken monohull has no such option.
Righting at sea, unless outside help is available, is
probably not a feasible option as yet. Probably better to leave
the craft as it is, where the crew are safe, and await rescue.
When the opportunity arises, and outside assistance is
available, the most successful system for any multihull, is to
tow the capsized boat fore and aft, the tow line going to the
aft end, in the form of a bridle. Which end depends on the
boat, but the general rule is to choose the end that is floating
Push it too far and this is what may happen - a capsized F-27 - note how high it is floating, the water level being around the
bottom of the beams. Even in this position it remains a relatively easy and safe boat to move around on.
Copyright © 1997 By Corsair Marine
Page 28
However, the cleanup work required is not so easy - the same F-27 just after righting- looks a mess right? Well sail sensibly
and don't even risk a capsize - it is easy to avoid
highest. Thus as the boat begins to move, the lowest end, be
it bows or stern, will begin to sink, and even more so as the
water inside rushes forward. The boat should then flip back
upright, bow over stern or visa versa.
e a c h floa
Bridle to
If the above procedure does not work, then try flooding the
end that needs to sink, or add some crew weight (ready to
abandon ship once the end concerned starts to go under). If
this fails, try towing the other direction. Some controlled
flooding may also be required. Towing sideways will not
Another righting method, that uses the folding system,
has been tested and shown to be workable on a Farrier
designed 19' Tramp in choppy conditions, and on an F-27 in
smooth water. The Tramp was deliberately rolled over, the F27 was a capsize.
The method has not been successfully tested at sea and
thus should not be tried at sea, it being better to wait for
assistance, as the righting action does tend to flood the
inverted boat more. Not a good idea if the righting attempt
doesn't work.
The F-27 capsize was caused by the spinnaker combined
with a mainsail sheeted tight amidships (never do this while
under spinnaker in any circumstances). Both sails were
being carried in winds gusting to 35 knots, with NO ONE
holding the sheets. Crew was just owner and 10 year old
daughter. Boat speed was over 20 knots and the capsize
happened while changing from a run to a reach, and the crew
were not able to release the sheets in time. In these
conditions the sheets should always be hand held without exception. The spinnaker sheet can be easily led to the
windward jib sheet winch, making this very easy to do.
After capsize both crew surfaced under the wingnets, but
found plenty of space to breathe due to the high floating
position. There appears to be little danger in being trapped
Page 29
Copyright © 1997 By Corsair Marine
here. They were then able to get on to the upturned boat (now
a safe 19' wide raft), which was towed ashore, and righted,
with relatively little damage, the next day.
The procedure using the folding system is as follows:
1. Put on a lifejacket - this is essential for easy working in
the water.
2. The boat will be floating side on to the waves, and you
should first attach righting ropes to the windward float beam
areas and bring them over the main hull to the leeward float.
Use a pair of lines for each available crew member.
3. Disconnect and save both shroud tensioners if fitted,
which can then be used to help as necessary.
4. Release top shrouds from the float chainplates, and
allow to drop with fixed masts. Secure a line from the leeward
shroud, with rotating masts, to the leeward float.
5. Connect a line to the forward beam area on the leeward
float and connect this to righting line from other side using
4:1 shroud tensioner.
6. Release all beam bolts. This can be done while
alongside without diving. The bow nets may have to be
unlashed to reach forward beam bolts.
Vent tube float
Air vent tube
10. Release mainsheet from traveller, the jib sheets, jib
tack, inner forestay (if fitted), and any remaining shrouds.
The mast will now drop, or hang from the step pivot pins
with fixed masts, which will soon break from the motion of the
unsupported mast. If not, then remove the nuts of the deck
pivot brackets from inside. Mast will now hang from the
leeward float.
11. Open all hatches on the leeward float, and stand on
the float, stabilizing yourself with the righting ropes, to the
windward side. The float will slowly start to flood. If necessary
small holes may be required on the highest part of the float
side to let out trapped air, or a simple vent tube from this area
to the atmosphere will allow the air out.
12. As the float floods, start rocking back and forth in time
with the waves. Once the float is flooded sufficiently, the boat
should roll upright. It's possible to climb around the boat as
it rotates to end up on deck. The beam retaining pins will fall
out and the floats will tend to unfold themselves.
Now tighten the beam bolts, and start bailing. A long
tubular type bilge pump is needed to do this successfully.
You may initially need to wrap a rag or towel around its body
where it enters the circular float hatch to prevent water
reentering. Pump should always be secured so that it cannot
float away.
If you find your weight is insufficient to cause righting, then
additional weight such as the outboard motor, or battery can
be sent down the mast line to assist. If assistance is available, then a tow sideways will help - and this is the only
situation where a sideways tow will work.
The mast may or may not be salvageable, depending on
the number of crew available.
7. Stand on the wingnet and pull on the shroud tensioner.
The float on the side you are standing on will fold up, your
weight helping. Once folded, insert the beam locking pins.
Repeat process with other side float. Smaller designs will
fold up just from your weight on the wingnet.
You now need to drop the mast off, and use its weight to
assist righting, by helping the hull to rotate in the direction
desired. This is done by hanging it from a line passing over
the leeward float, and attached to the windward float.
If in sheltered waters, damage to mast can be minimized
by pulling back to the trailering position. However, outside
assistance will probably then be needed to rotate the boat.
8. Release the forestay, attach a line, and take to the
center of the leeward float. Run the line over the center hull
to attach to the windward float deck eye just in front of the
deck hatch.
9. Release all halyards from the rope clutches, and
unthread from the turning blocks.
Copyright © 1997 By Corsair Marine
Page 30
There have been exhaustive efforts to minimize
the risk of personal injury, loss, or any other form
of damage, while operating a Corsair built trimaran, but obviously it is impossible to completely
eliminate every risk. Winches cannot be made trip
proof, nonskid can wear and cause slipping, rigging wires can be kinked while rigging and later
fatigue, lifelines can be fallen over, frequent groundings at speed can cause eventual daggerboard or
rudder failure, neglect of proper maintenance can
cause early failure, and lack of experience can
cause accidents in congested areas, or bad conditions. Sailing can be hazardous at times, and the
boat operator should accept responsibility for all
such hazards
Many of these risks have been covered in this
manual, but obviously it is impossible to cover
them all. Some recommended procedures may
not even be the correct ones in certain situations.
The operator should therefore always be vigilant
against all possible safety hazards and correct or
warn the crew against any possible danger immediately.
Capsize matters can be depressing, but to put it in
perspective, a capsize is simply very difficult to do. Luffing
up slightly, or bearing away (if on a reach) is usually all that
is required. The risk of capsize can be virtually eliminated
simply by reducing sail according to the conditions, and
being prepared to let the sheets go.
When under spinnaker in winds of over 20 knots it should
always be a matter of policy to never leave the spinnaker
sheet unattended. It should be hand held, not even cleated.
Cruisers shouldn't even use the spinnaker in over 20 knots.
Under main and jib you can still reach 15 knots, with
complete comfort and safety.
Fortunately it is very hard to capsize a Corsair trimaran,
but this can lead to overconfidence. Don't fall into this trap always be aware that it is possible to capsize, and reduce
speed accordingly to suit the conditions - just like any car.
The trailer winch line should be regularly replaced. This
tends to wear quite rapidly and is under a high strain when
lifting the mast. A breakage here could be very dangerous.
It is always advisable to stand clear of the line while lifting the
mast. Also, frequently check the trailer winch line is tight
when on a long trip.
CAUTION: The spring retaining clips as used on the
Turnbuckle clevis pins should be regularly checked to ensure they will still 'clip' fit on the clevis pin. Replace if they
have lost their spring and become loose, otherwise you
could lose your mast.
These spring clips have been used successfully for over
20 years and are intended as a convenient 'quick rig' feature.
They are not as secure as a properly fitted cotter pin, and if
any doubts exist on their use then a cotter pin or circular ring
should be used instead, and a few of these are usually
included in the Toolbox. However these rings or pins will
increase rigging time, and the final decision in this regard is
for the owner.
If immersing the trailer to the bend in the frame will still not
let you free the boat, be careful; a few inches more can have
your boat drifting away, so have a bow line secured.
These should always be in place and tightened before
going sailing. Otherwise the Upper Folding Struts can again
be overloaded as above, due to the beam inner end being
forced up slightly by sailing loads.
It is also possible, but unlikely, for a Beam bolt to gall and
seize in a bolt pad, which can prevent you from folding up the
boat. If this happens, then you can still fold up the boat by
simply releasing the bolt pad nuts from inside, or cutting off
the Beam bolt head. To avoid this, keep the threads well
lubricated with a Teflon grease.
If you find this is tight going up or down (a not uncommon
problem with full batten boltrope mains), there are now some
spray-on silicon compounds that can help. Remember to
also check that the mainsail foot outhaul is slackened off.
Don't forget this is a very effective and safe way of
absorbing gusts while reaching in strong wind conditions,
particularly under spinnaker. Rounding up tends to throw the
mast to leeward (the wrong way), and can increase speed
dramatically - all very exciting. However, bearing away
throws mast to windward, speed falls off, and the motion
feels much safer. This may sound odd, but try it sometime in
lighter conditions to get confidence - it really works.
The tiller should always be light and easy to handle, with
just one hand. If not, then there is something wrong. Usual
cause is the rudder blade has kicked back slightly. If this is
not the problem then rudder may not be raked far enough
forward. This can be changed by filling the pivot hole in the
rudder blade and re-drilling slightly further forward (say 1/4").
This is not an uncommon occurrence due to the difficulty
in getting perfectly fair foils in a production environment, and
even carefully hand made foils can develop a hum. This can
be reduced or eliminated with a little fine tuning by filing or
sanding the trailing edge of the foil concerned as follows:
Better if
30° or smaller
The bottom left shape is probably the easiest to achieve
in practice, and the least likely to be damaged.
This can be a problem at very high speeds, and symptoms include a 'whoop' sound out the back, a huge rooster
tail, and no steering. This normally only happens with speeds
over 15 knots and fortunately the boat usually just keeps
tracking straight.
The cause is air being sucked down the side of the rudder
at high speeds, particularly if oversteering. Immediate cure
is to waggle the rudder a little, or bring it back onto the
Page 31
Copyright © 1997 By Corsair Marine
centerline until the water flow reattaches, or slow down.
To avoid, always keep the leading edge of your rudder
smooth and fair, and if it becomes a consistent problem then
the best cure is to fix a horizontal 'fence' to the leading edge
of the rudder about 12 to 15" up from the bottom.
sion loads in this area to be directed through the Upper
Folding Struts, which, in the case of the F-24 and F-31 are not
strong enough for such loads. They are designed for folding
loads only, and the end mounting points may fail.
Compression Pad must fill this gap
Upper Fold
ing Strut
This will prevent the air from travelling down the blade
and retains steering control, even if the top part of the rudder
has ventilated. Such fences are fitted as standard on some
higher performance models.
When leaving the boat for any length of time with floats
extended, the shroud tensioners on the F-31 should be let
off. If not, the high tension could slowly bend the boat, due to
'creep' characteristics. This rule applies to all boats with
adjustable backstays.
When initially setting up, shrouds with such tensioners
must be adjusted to be just long enough to reach chainplate.
There will then only be a small deflection when the tensioners are applied. Avoid the shrouds being too long as the
resulting large deflection will put too much load on the
tensioners, and this could put the mast at risk.
Low load on
adjusted for
Too much load on
tensioner - could slip
or fail causing loss of
Too much
tighten shroud
When sailing offshore, or for long periods, it is best and
safest to fully tension the cap shrouds with the turnbuckles,
so there is no reliance on the tensioners.
These are fitted to the ends of F-24 and F-31 beams, to
eliminate any gap or movement between the beam ends and
the raised pads in the hull.
Do not remove, as this would cause the high compresCopyright © 1997 By Corsair Marine
This would not cause a serious beam problem as the
beams then simply move inboard to bear against the hull
again. The boat is not threatened structurally. However,
repairing an U.F.S. mounting point is difficult and expensive.
The plastic compression pads should be full width of the
beam and bear evenly against both beam and hull, to avoid
any point loading. This should be checked periodically.
The F-28 has similar pads on the forward beams, but
these are not structurally important, their only purpose being
to eliminate any movement for better rig stiffness.
Take care that you do not step near the inner ends
of the nets on the sides where lashing cannot be used in
order to allow easy folding. Your foot may go through this
gap. This area can be lashed if you wish, but should you
forget to undo when folding, the eyelets in the nets will be
pulled out.
A bimini top can be very useful, due to its ability to shade
the cockpit. For storage, it can be hung over the stern and
tied to the pushpit.
The floats are vented through micro cowl vents fitted to
the float transoms (or spring loaded vents just aft of the
forward beams on earlier models). These are to prevent a
build up of air pressure inside the floats on hot days, that
could be enough to open up the hull to deck join.
The watertight bulkheads at the forward beam and Shroud
chainplate bulkheads thus have very small holes near the
top to allow venting throughout the float. Should the float ever
be holed then these should be well above the flooded
waterline, or at worst, only allow a very small amount of water
Should the float be inverted as in a capsize, then the
airlock formed above these vents would prevent any significant flooding.
Hollow beams such as used on the F-28 also need
draining/venting, and this is done through tubes extending
from the bottom of the beams inside the floats. Should water
appear from these then the source of the leak in the beams
should be investigated, and repaired.
In the case of capsize, these tubes are designed to extend
Page 32
above the floats flooded waterline, so as to prevent any water
entering, and consequent loss of beam buoyancy.
Many grades of stainless steel will get an occasional
brown stain in saltwater, that can look like rust. The grade
used on most marine fittings is Type 304 or 303, and both of
these will show this. Type 316, a more expensive grade, but
actually slightly weaker, does not. All three grades can be
used on a Corsair, depending on the application. To avoid
this staining, always wash your boat down with fresh water
after every outing. The brown stains will not appear if the salt
is washed off.
These can be extended for cleaning, if wished, while boat
is on the trailer. Float supports must first be dropped down,
and the boat then rocked one way. The 'high side' float can
then be extended. Let the boat lean the other way and the
remaining float can be extended. You will need to support the
floats in some way once extended.
The beams should also be carefully checked if they have
received any significant sharp impact. Being carbon fiber,
they can be cracked or damaged from sharp impacts, and
areas to check are around the lower folding strut brackets,
and just inboard from the float. Even if no damage is found,
continue to monitor for cracks over a period of time.
An area to check on early F-31s the deck to hull join flange
on the main hull, just under the forward beams. This was a
difficult join to do, and susceptible to cracking, particularly
after a significant fore and aft collision. The diagonal wire
braces as used on the F-31 tend to direct shock loads into the
forward beam structure in this area. Any cracks in this flange
should be investigated and repaired.
The forward beam bulkhead to hull join tape just adjacent
to this flange area on the F-31 should also be investigated
closely, as this is a known failure point from such collisions.
Damage here may not be visible initially, but it may grow to
eventually fail later, so continue to monitor. The boat still
holds together should this tape delaminate, but obviously
sailing should cease until it is repaired.
If you are having problems with un-house trained birds on
your boat, just leave a dummy, but lifelike, snake in the
cockpit floor. Works well.
Any boat that has had a significant fore and aft collision
on the float bow, or the folded beams have hit a low bridge,
should always be thoroughly checked. No boat can be made
collision proof, and hidden damage can result.
The complete float should always be checked after an
impact, not just the bow area. A heavy fore and aft collision
can actually propagate throughout the float, and has even
generated cracks around the aft deck inspection hatch
flanges for instance. In one case, a float hull had a vertical
fracture in the aft beam area from a severe bow collision.
Hurricanes frequently cause damage to many boats, and
on one occasion capsized a folded F-27. The owner had left
it on a mooring, and being worried about possible damage
from other boats breaking their moorings nearby felt it best
to fold her up to reduce the 'target' profile. However this
considerably reduces stability, and as stated earlier, this is
limited while folded. As a result, no doubt while swinging
sideways, the gale force winds blew the F-27 on its side.
The best procedure in such a situation is to get the boat
out of the water, and trailer it inland away from harm - the
perfect solution and used by most owners. If there is not time
for this, then leave the floats extended, and pump water into
each float and the main hull to weigh her down. Also remove
the wing and bow nets. These don't have much windage, but
it is surprising how much it can be in such winds. Lowering
the mast will also reduce windage. Your boat is then as safe
as anything can be in a hurricane.
Large wood pad 3 x 6 x 12"
(75 x 150 x 300) to spread
load across beam
Option 1 (best): Support under
each beam, just outboard of,
and touching, beam brackets
Option 2: Support under
each beam area on floats
When necessary, the craft can be supported for short periods
as detailed above for anti-fouling or other maintenence work.
Page 33
Copyright © 1997 By Corsair Marine
The following specifications may vary depending on options, and manufacturing or design changes
F-24 Mk II
F-28R continued
L.O.A............................................... 24' 3"
L.W.L.............................................. 23' 7"
Beam.............................................. 17' 11"
Folded Beam.................................. 8' 2"
Draft Hull only ................................ 1'
Draft D/board down ........................ 4' 5"
Sail Area (Main and Jib) ................ 365sq.ft. (34sq.m)
Mast length......................................31' 10"
Mast height above water................. 36' 2"
Approx. Weight ...............................1690lb
Load Capacity ................................ 1000lb
Opt. Watertank capacity..................5 gals.
Opt. Holding tank capacity.............. N.A.
Battery size .................................... Group 24 deep cycle
Outboard recommended................. 4-8HP
Height on trailer ..............................8' 10"
Approx. Towing Weight................... 2800lb
Approx. wind capsize force
31 knots
(fully loaded with main & jib)
Load Capacity ................................ 1350lb
Watertank capacity......................... 16 gals. (60L.)
Opt. Holding tank capacity.............. 16 gals. (60L.)
Battery size .................................... Group 27 deep cycle
Outboard recommended................. 6-10HP
Height on trailer ..............................11' 6"
Approx. Towing Weight................... 4100lb
Approx. wind capsize force
32 knots
(fully loaded with main & jib)
L.O.A............................................... 28' 5"
L.W.L...............................................26' 3"
Beam ..............................................19' 9"
Folded beam .................................. 8' 2 1/2" (2.5m)
Draft Hull only ................................ 1' 2"
Draft d/board down..........................4' 11"
Sail Area (Main and Jib) .................475sq. ft. (44.2sq.m.)
Mast length......................................36' 10"
Mast height above water................. 41' 4"
Approx. Weight ...............................2690lb
Load Capacity ................................ 1350lb
Watertank capacity......................... 16 gals. (60L.)
Opt. Holding tank capacity.............. 16 gals. (60L.)
Battery size .................................... Group 27 deep cycle
Outboard recommended................. 6-10HP
Height on trailer ..............................11' 6"
Approx. Towing Weight................... 4100lb
Approx. wind capsize force
34 knots
(fully loaded with main & jib)
L.O.A............................................... 28' 5"
L.W.L...............................................26' 3"
Beam ..............................................19' 9"
Folded beam .................................. 8' 2 1/2"
Draft Hull only ................................ 1' 2"
Draft d/board down..........................4' 11"
Sail Area (Main and Jib) .................496sq. ft.
Mast length......................................38' 4"
Mast height above water................. 42' 10"
Approx. Weight ...............................2690lb
Copyright © 1997 By Corsair Marine
L.O.A............................................... 30' 10"
Beam ..............................................22' 5"
Folded beam .................................. 8' 2 1/2" (2.5m)
Draft Hull only ................................ 1' 4"
Draft d/board down..........................5' 6"
Sail Area (Main and Jib) .................599sq. ft. (55.6sq.m.)
Mast length......................................40'
Mast height above water................. 44' 11"
Approx. Weight ...............................3850lb
Load Capacity ................................ 1600lb
Watertank capacity......................... 16 gals. (60L.)
Opt. Holding tank capacity.............. 16 gals. (60L.)
Battery size .................................... Group 27 deep cycle
Outboard recommended................. 8-12HP
Height on trailer ..............................11' 6"
Approx. Towing Weight................... 5300lb
Approx. wind capsize force
36 knots
(fully loaded with main & jib)
L.O.A............................................... 30' 10"
Beam ..............................................22' 5"
Folded beam .................................. 8' 2 1/2" (2.5m)
Draft Hull only ................................ 1' 4"
Draft d/board down..........................5' 6"
Sail Area (Main and Jib) .................647sq. ft. (60sq.m.)
Mast length......................................42' 6"
Mast height above water................. 47' 5"
Approx. Weight ...............................3150lb
Load Capacity ................................ 2300lb
Watertank capacity......................... 16 gals. (60L.)
Opt. Holding tank capacity.............. 16 gals. (60L.)
Battery size .................................... Group 27 deep cycle
Outboard recommended................. 8-12HP
Height on trailer ..............................11' 6"
Approx. Towing Weight................... 4400lb
Approx. wind capsize force
32 knots
(fully loaded with main & jib)
Page 34
Mylar may be used for all sails
Sailcloth wgt. to suit wind in area sailed.
All sails are to be fitted with telltales
Max. roach is 41"/1040mm located 60%
up leach
Mainsail has 2 sets of reefpoints
Mainsail to have Cunningham eye fitted
Class emblem to be as shown.
Jib to have 3 leach battens placed at
equal distance on leach.
Jib hanks to be for 1/4"/6mm wire
29' 6"
30' 6"
11' 6"
Blade Jib
27' 8"
24' 6"
9' 9"
20' 8"
24' 6"
15' 5"
LP 4700
Asymmetric 33' 2"
30' 10"
26' 11"
Detailed sail plan available from Corsair Marine
F-24™ Mk II Sail Plan
Page 35
F-24 is a trademark of Ian Farrier
Copyright © 1997 By Corsair Marine
Square Top Mainsail as shown is required to be
Class legal.
Roach to be no more than 26"/660mm, 64% up
leach. (28"/710mm with F-28R).
Mainsail is designed to be almost flush with the
top of the mast as shown -do not shorten luff,
which has cutout as shown for halyard
Vertical Batten to be used at head to ensure head
stands vertical.
Tack cutaway to be as shown
Mainsail has 2 sets of reefpoints,
Mainsail to have Cunningham eye fitted
Class emblem to be as shown.
Mainsail battens to be parallel with boom or
slightly angled up as shown for easy roller
Jib to have four leach battens placed at equal
distance on leach.
Jib hanks to be for 9/32"/7mm wire
Detailed sail plan available from Corsair Marine
Copyright © 1997 By Corsair Marine
F-28™ & F-28R™ Sail Plan
Page 36
F-28 is a trademark of Ian Farrier
Leach Foot
14' 1"
36sq. m.
36' 1"
32' 1" 12' 9"
36' 1"
16' 11" 278sq.ft.
Asymmetric 41' 8" 35' 5" 28' 3" 1004sq. ft.
Spinnaker 12700 10800
If changing mast
Mast step should
rake, make sure
touch against
Center Web always also
deck plate here
bears evenly on
mast deck plate
here. Do not allow
pivot pin to take full
load of mast. Use
aluminum packing on
Deck plate if
Mylar may be used for all sails.
Sailcloth wgt. may be varied to suit wind in
area sailed.
All sails are to be fitted with telltales
Mainsail has 2 sets of reefpoints
Max. Mainsail roach is 56"/1425mm (
located 60% up leach.
Mainsail to have Cunningham eye fitted
Class emblem to be as shown.
Mainsail battens to be angled as shown for
easy roller furling
Jib to have 4 leach battens placed at equal
distance on leach. 4 Leach battens are
optional on Genoa
Foresail hanks to be bronze and for
9/32"/7mm wire
F-31™ Sail Plan
Page 37
F-31 is a trademark of Ian Farrier
Copyright © 1997 By Corsair Marine
Square Top Mainsail as shown is
required to be Class legal.
Roach to be no more than 34"/864mm,
60% up leach.
Mainsail is designed to be almost flush
with the top of the mast as shown -do
not shorten luff, which has cutout as
shown for halyard clearance.
Vertical Batten to be used at head to
ensure head stands vertical.
Tack cutaway to be as shown
Mainsail has 2 sets of reefpoints,
Mainsail to have Cunningham eye
Class emblem to be as shown.
Mainsail battens to be parallel with
boom or slightly angled up as shown
for easy roller furling.
Jib to have four leach battens placed at
equal distance on leach.
Jib hanks to be for 5/16"/8mm wire
Asymmetric 45.2
29.75' 996sq.ft
Detailed sail plan available from Corsair Marine
Copyright © 1997 By Corsair Marine
F-31R™ Sail Plan
Page 38
F-31R is a Trademark of Ian Farrier
Options may be shown in these layouts, and
specifications may be subject to change.
Optional modular
Galley unit
Barber Hauler eyes
Optional Stanchion base
Optional lifeline eye
Optional lifeline eye
Strap around aft beam for
opt. screacher. Can also
be used for spinnaker
Float bow
Stern Cleat
Mainsheet traveller
under cockpit
Spin. T
D/boa rdacUk
Anchor Line
Mast raising wire
Jib Sheet
Spinn.winch & cam cleat
Barber hauler
lead & cleat
D/boa rd D
bow pole
Spinnaker pole
brace wire
Spinnaker Sheet eye
Page 39
Copyright © 1997 By Corsair Marine
Optional aft berth
Water tank and opt.
holding tank are under
forward berth
Optional Stanchion base
Optional lifeline eye
Optional lifeline eye
Strap around aft beam
for optional screacher.
Can also be used for
Safety Compartment
in coaming
Ma st rai sing
wi re anchor
Main H aly aly ar d
D /b oard U d
Drum Cleat
Mainsheet traveller
Jib Sheet
Opt. Furling
line camcleat
Spinn.winch & cam cleat
Barber hauler
lead & cleat
Float bow eye
Spinnaker sheet pad eye
tank fill
Anchor Line
Screacher drum
line lead
Mast rotator
rd D ow n
D /b oaaly
Jib H aral.
Sp in n. H
Sp in n. Ta
Opt. furler
line lead
Spinnaker tack
line deadeye
bow pole
Opt. holding
tank outlet
Barber Hauler eyes
Copyright © 1997 By Corsair Marine
Page 40
Options may be shown in these layouts, and
specifications may be subject to change.
Berth slides forward
to form double
Watertank and opt. holding
tank are under fwd. berth
Optional Stanchion base
Barber Hauler eyes
Optional lifeline eye
Strap around aft beam
for F-31R opt. screacher.
Can also be used for
Safety Compartment hatch
Stern Cleat
tank fill
Jib Sheet
Mainsheet traveller
Sheet Winch
Spinn. Tackline
D/Bb. Clamcleat (up)
Main Halyard
Lifting eye
Spinn.winch & cam cleat
Barber hauler
lead & cleat
Anchor Line
F-31R Mast raising
wire anchor
Float bow eye
Jib Halyard
Spinn. Halyard
D/Bd Clamcleat (down)
Opt. furler
line lead
F-31 Mast raising
wire anchor
bow pole
Opt. Holding
Tank outlet
Spinnaker pole
brace wire
Pad eye for Spinn. sheet and
Shroud tensioner (if used)
Page 41
Copyright © 1997 By Corsair Marine
Inner supports bear
against side of hull
Outer supports bear against
floats (need to be lowered to
unfold boat on trailer)
All supports should bear evenly
and equally against boat
Wire/line to
restrain pole
fore and aft.
Rudder in
If necessary, light lines can
be run each side to mast
raising wire anchor points to
stabilize pole sideways.
Trailer winch
line being used
to raise mast
Aft Mast
Mast support
brace (to
Mast in
Mast in
Spinnaker pole can be
removed or stored
vertically for trailering
or docking. Retracted
on F-28.
Bracket for mast
on pulpit.
Tie down line
Keel board should
curve up to match
hull at aft end
Trailer tie down loop
Trailer lights - on a separate removable
bar mounted on transom or Aft Mast
Support, with cable run independently
over boat.
Keelboard must extend
forward past daggerboard
case aft end
If required, separate support bracket can be
made for bow to raise mast above towing
vehicle. Mast can be moved further forward
if required to limit overhang out the rear.
Always check that trailering setup complies with local regulations
(F-31 Aft Cockpit Version Shown)
Copyright © 1997 By Corsair Marine
Page 42
Seller warrants, for a period of one year from the date of
delivery, to the original purchaser, that the F-24/F-27/F-28/F-31
will be free of defects in material and workmanship. Seller's
sole obligation under this warranty shall be limited to replacing,
correcting or repairing any part manufactured by Seller which is
determined by Seller to be defective by reason of faulty
workmanship or material. This warranty shall not apply to:
a. Defects caused by accident, misuse, neglect, improper
repair, lack of maintenance, normal wear and tear, negligent
operation, or improper modification by persons other than
Seller's employees.
b. All parts or accessories not supplied by Seller and any
part not manufactured by Seller. Any warranty on such parts, if
possible, will be passed on to Purchaser, and Seller will agree to
act as Purchaser's agent in any warranty claims on these parts.
c. Any discoloration, crazing or cracking on all exterior
finishes (including paint, gelcoat and anodizing). Only the best
gelcoat and paints are used on the F-24/F-27/F-28/F-31 but they
cannot be warranted as they may be affected by climate or other
factors beyond the control of the Seller.
d. Any damage caused by improperly rigging, trailering, or
e. Defects or faulty workmanship caused by persons other
than the manufacturer, a currently authorized dealer, or a
Corsair-approved repair facility, in modifying the F-24/F-27/F28/F-31 or in adding, altering, or removing equipment to the F24/F-27/F-28/F-31 whether or not such equipment was supplied
by the manufacturer, or if such modifications, additions, or
equipment removal by such persons have not been performed in
strict accordance with accepted boat and yacht building practice
and approved in writing by the manufacturer.
f. Any vessel that has been used in a trans-oceanic passage
exceeding two hundred (200) nautical miles from any coast.
Seller further warrants, for a period of five (5) years, that the
hulls, beams, and folding system of the F-24/F-27/F-28/F-31
shall be free of any structural failure during normal operation.
Seller's obligation under this warranty shall be limited to
replacing, correcting or repairing any failed part which, in the
judgment of the seller, has impaired the structural integrity of
the F-24/F-27/F-28/F-31. This structural failure warranty shall
be void if Seller should determine that said components have
been subjected to any abuse, including but not limited to
collision with other vessels, structures or objects.
Seller further warrants, for a period of five (5) years, that the
hull, deck, floats, beams, and other fiberglass parts
manufactured by seller will be free of voids and blisters. Seller's
obligation under this warranty shall be limited to repairing the
void or blister. Seller reserves the right to exclude from this
warranty provision those portions of any vessel subjected to
prolonged or extended immersion unless previously protected
by proper application of appropriate anti-foulant paint.
Purchaser shall be responsible for returning the F-24/F-27/F28/F-31, or any defective part, to the Seller's plant, for any
warranty repairs, with all transportation charges paid by the
Purchaser. Seller, may at its option, direct Purchaser to
transport the F-24/F-27/F-28/F-31 to an independent repair
facility for any needed replacements, corrections, or repairs.
Purchaser agrees to promptly notify Seller of any condition
or part which Purchaser believes to be defective within thirty
(30) days of discovering defect.
Purchaser and Seller agree that THE FOREGOING
Page 43
Copyright © 1997 By Corsair Marine
For continued safe and enjoyable operation, it is essential
that regular maintenance be carried out. Trimarans are
actually more like aircraft in many aspects, and it is important
to conduct regular maintenance and safety checks to locate
any potential problems before they become serious.
The following Maintenance Safety Checksheet has
thus been developed and it is strongly recommended that
a full check be undertaken every 6 months.
In general, after every sail, the complete boat and trailer
should always be thoroughly washed down with fresh water.
This is very important to keep that new look, and to prevent
rust taking hold on the trailer. Particularly wash out the
brakes and suspension area of the trailer. Regularly check
the bilges of the center hull and the floats for any water.
Sails should always be rolled up or folded (the same way
as you receive them) - dried first if wet.
If possible, keep your boat under cover, as this will ensure
the finish keeps its gloss for the life of the boat. Even the best
gelcoat finish will eventually begin to fade.
strands or wear, particularly where they enter the
mast when sails are up, and where rope clutches
engage. A sleeve over rope tail at rope clutch area
can prolong life and give better clutch holding power
❒ Spinnaker halyard should have any worn area at
the top cut out and the halyard retied or spliced to the
snap shackle.
❒ All stays should be checked for broken strands
or corrosion, particularly at end swages. If any stays
are badly kinked, replacement should be considered.
Stainless steel is prone to fatigue, and in a trailer boat it
is not uncommon to get kinks in the stays while rigging or derigging. This further fatigues the wire, and even though the
stays are oversize, it is strongly recommended that all stays
be replaced after 3 to 5 years.
Check all turnbuckles for corrosion, and that all
locking rings or pins are in place, and work correctly.
Masthead sheaves should turn freely, and clevis
or pivot pins should not be worn or show
signs of distortion.
Spinnaker halyard and Jib halyard sheaves
should turn freely, and clevis or pivot pins should
not be worn or show signs of distortion.
❒ Check bow U-bolt and spinnaker eye for any
Check all chainplates for any signs of movement
Forestay tab/nose should be checked for any
cracks or signs of distortion
Check deck to hull joins where visible for any
delamination or cracking in join.
❒ All other stay attachments to mast should be
checked for distortion or corrosion.
Mast step should be checked for any distortion
or cracks
❒ Mast step sheaves should turn freely, and clevis
or pivot pins should not be worn or show signs of
Check wing nets, particularly eyelets for wear.
Wingnets should be replaced every three or four years.
The taped edges are usually the first to fail, and sometimes
just redoing these will extend the net life. If replacing nets,
avoid any close weave fabrics as these can trap wind
underneath, creating unwanted lift. Bow nets, in particular,
should always be of a very open weave.
❒ Boom gooseneck pins should be checked for any
signs of wear or distortion
❒ Check rudder case for any sign of stress cracks,
or corrosion, particularly at lower end. Rudder blade
should swing up and down easily in case, but without
any slop.
All halyards should be checked for broken
Copyright © 1997 By Corsair Marine
Check rudder blade or shaft around bottom edge
of rudder case for any stress cracks. Replace if
Page 44
Check leading and trailing edges of rudder blade
for any delamination or splitting.
❒ Check rudder control lines for wear, and replace
pull down line every year
❒ Check all pivot pins for corrosion, and that
circlips or nuts are properly fitted.
Check hull and beam brackets for any looseness
or cracking
❒ Check leading and trailing edges of daggerboard
for any delamination
❒ Check all folding struts have plastic bushes at
pivot points, and that there are no major cracks in
welds (these welds are not structurally important, and
small cracks are not significant - these resulting from
flex during folding)
Check daggerboard around bottom edge of hull
for any stress cracks
Check control lines for wear and replace if
❒ Check locking pins (for when floats are
retracted) and brackets for excessive wear. Rubber
stop should be replaced if worn excessively.
Check traveller welds for any signs of cracking
❒ Check Hull area around Lower Folding Strut
brackets for any signs of damage/cracking
❒ Check that floats do not bear directly on to the
main hull. There should be a bumper on the hull side,
or a minimum 1/8" gap.
On early model F-31s check around main hull/
deck join flange just under forward beams for any
cracking in join.
Check all deck fittings for any cracks or wear.
Check Trailer winch line for wear
When raising the mast by using the winch there is
considerable tension on the jib halyard and winch
line. Be doubly careful when checking these for wear
as failure of either one could result in severe injury.
Check all beam join flanges for any signs of
delamination or cracking.
Any delamination or cracking in beam flanges shouldbe
regarded as serious and must be repaired without delay.
Otherwise a small crack can grow until it can cause failure.
❒ Check top non-skidded surface of beams for any
movement or ‘softness’ under foot, or if ‘oil canning’
or rippling of the top beam surface can be observed
while sailing. Must be inspected and repaired
immediately as this could be a serious fault.
❒ Check that plastic compression pads remain on
inner ends of beams and that they bear against deck/
hull when floats are extended. Also check around this
area for any signs of damage or cracking, on both
deck/hull and beam.
Check all trailer supports bear evenly against
Trailer should be regularly cleaned and oiled
Check wheel bearings for wear
Check operation of brakes.
Any defects or problems found during this check
should be remedied immediately.
This Checklist is intended as a guide only and may
not cover every potential problem. Owner should
always check every aspect of boat on a regular basis.
❒ Lightly grease beam bolt threads with a teflon
Page 45
Copyright © 1997 By Corsair Marine
Corsair Marine, Inc., 150 Reed Ct., Chula Vista, CA 91911, U.S.A.
Copyright © 1997 By Corsair Marine
Page 46
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