Building Instructions for CARF

Building Instructions for CARF
CARF-Models Spitfire
Building Instructions
Version 1.1
Building Instructions for CARF-Models Spitfire
Thank you very much for purchasing our CARF Models Spitfire all composite
aircraft, made in total area vacuum sandwich (TAVS) technology. Skilled
craftsmen and experienced modelers have finalized the shapes and contours as
well as the details of the plane before the production mold was made. This hightech marvel of production tooling is a precise, handcrafted set of molds, which will
allow us to supply precision composite parts for many years to come. Before you
get started building and setting-up your aircraft, please make sure you have read
this instruction manual several times, and understood it. If you have any
questions, please don’t hesitate to contact us. Below are the contact details:
Email: LQIR#FDUIPRGHOVFRP
Website: KWWSZZZFDUIPRGHOVFRP
Liability Exclusion and Damages
You have acquired a kit, which can be assembled into a fully working R/C model
when fitted out with suitable accessories, as described in the instruction manual
with the kit. However, as manufacturers, we at CARF-Models are not in a position
to influence the way you build and operate your model, and we have no control
over the methods you use to install, operate and maintain the radio control system
components. For this reason we are obliged to deny all liability for loss, damage or
costs which are incurred due to the incompetent or incorrect application and
operation of our products, or which are connected with such operation in any way.
Unless otherwise prescribed by binding law, the obligation of the CARF-Models
company to pay compensation is excluded, regardless of the legal argument
employed. This applies to personal injury, death, damage to buildings, loss of
turnover and business, interruption of business or other direct and indirect
consequent damages. In all circumstances our total liability is limited to the
amount which you actually paid for this model.
BY OPERATING THIS MODEL YOU ASSUME FULL RESPONSIBILITY
FOR YOUR ACTIONS.
It is important to understand that CARF-Models Co., Ltd, is unable to monitor
whether you follow the instructions contained in this instruction manual regarding
the construction, operation and maintenance of the aircraft, nor whether you install
and use the radio control system correctly. For this reason we at CARF-Models
are unable to guarantee or provide a contractual agreement with any individual or
company that the model you have made will function correctly and safely. You, as
operator of the model, must rely upon your own expertise and judgment in
acquiring and operating this model.
CARF-Models Spitfire
2
Supplementary Safety Notes
Pre-flight checking:
Before every flying session check that all the model’s working systems function
correctly, and be sure to carry out a range check. The first time you fly any new
model aircraft we strongly recommend that you enlist the help of an experienced
modeler to help you check the model and offer advice while you are flying. He
should be capable of detecting potential weak points and errors. Be certain to
keep to the recommended CG position and control surface travels. If adjustments
are required, carry them out before operating the model. Be aware of any
instructions and warnings of other manufacturers, whose product(s) you use in
this particular aircraft, especially engine and radio equipment. Please don’t ignore
our warnings, or those provided by these other manufacturers. They refer to facts
and processes which, if ignored, could result in permanent damage or fatal injury.
Attention !
This Scale-Aircraft is a high-end product and can create an enormous risk for both
pilot and spectators, if not handled with care, and used according to the
instructions. Make sure that you operate your Spitfire according to the AMA rules,
or those laws and regulations governing the model flying in the country of use.
The engine, servos and control surfaces have to be attached properly. Please use
only the recommended engines, servos, propellers, and accessories supplied in
the kit. Make sure that the ‘Centre of Gravity’ is located in the recommended
place. Use the nose heavy end of the CG range for your first flights, before you
start experimenting with moving the CG back. If you find that you need to relocate
your batteries or even add weight in the aircraft to move the CG to the
recommended position, please do so and don’t try to save weight or hassle. A tail
heavy plane, in a first flight, can be an enormous danger for you and all
spectators. Fix any weights, and heavy items like batteries, very securely to the
plane. Make sure that the plane is secured properly when you start the engine.
Have at least 2 helpers hold your plane from the tail end, or from behind the wing
tips, before you start the engine. Make sure that all spectators are behind, or far in
front, of the aircraft when running up the engine. Make sure that you range check
your R/C system thoroughly before the first flight. It is absolutely necessary to
range check your complete R/C installation first WITHOUT the engine running.
Leave the transmitter antenna retracted, and check the distance you can walk
before ‘fail-safe’ occurs. Then start up the engine, run it at about half throttle and
repeat this range check with the engine running. Make sure that there is no range
reduction before ‘fail-safe’ occurs. Only then make the 1st flight. If you feel that the
range with engine running is less then with the engine off, please contact the radio
supplier and the engine manufacturer and DON’T FLY at that time. If you fly with
2.4 GHz technology, please follow the radio manufacturer’s instructions for range
checking. Always check range before a flying session!
CARF-Models Spitfire
3
Packing Checklist (include in box)
Amount Description English
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
Check
Fuselage
Rudder
Right wing (with LG Housing installed)
Left wing (with LG Housing installed)
Wing tube anodized Ø40 x 580 mm long
Right aileron
Left aileron
Cowling
Canopy frame
Clear canopy
Elevator
Cowling
Stabilizer assembled
Wing radiator
Air intake
Oil cooler (Option)
Hardware pack
Instruction Manual and photo sheets (English)
CARF-Models Spitfire
4
Hardware
Wing pack
Quantity Description
2
2
1
4
8
6
16
6
16
22
16
16
1
4
1
Allen screw M5 x 60 Wings mount rear
Allen screw M5 x 100 Wing mount front
Plywood 3 x15 x 500mm Strip for servo hatches
Phenolic small control for Aileron and Flap
Steel spring clevises M3 for Aileron and Flap
T-Nut M4 for plywood servo mount
T-Nut M4 for Landing gear mount
Allen screw M4 x 8mm for plywood servo mount
Allen screw M4 x20mm for Landing gear mount
Washer M4 for all M4 screws
Sheet metal screws 2.2 x 9.5 for mount servo hatches
Sheet metal screws 2.9 x 13 for servo mount
All thread M3 x 1000mm Long for all linkage
Plywood 3 mm servo mount set milled for Aileron, Flap
Plywood 1.5 x 13 x 600mm Strip for Aileron, Flap servos mount
Separate
Pack
Stab/Elevator/Rudder pack
Quantity Description
3
2
1
4
8
1
1
1
2
1
1
Steel spring clevises M3 for Elevator 1pc, Rudder 2 pcs
Thread end with hold for Rudder
Pull-Pull wire dia 0,65 x 1200 mm. Long for Rudder
Camp tube for pull-pull wire
Sheet metal screws 2.9 x 13 for servo mount
Plastic ball ink M3 for Elevator
Allen screw M3 x 20 mm. for Elevator control horn
Stop nut M3
Hinge pin 1 meter long
Carbon Tube OD8, ID6 1000 mm long for Elevator
Plywood 3 mm servo tray milled for Rudder and Elevator
Separate
Pack
Fuselage pack
Quantity Description
12
1
2
1
Sheet metal screws 2.9 x 13 mm. for cowling mount
Throttle servo mount milled
Plywood 3 mm. firewall milled
Plywood 3 x15 x 500mm Strip for servo cowling mount
CARF Models Spitfire
Separate
Pack
5
Wood Bag
Quantity Description
2 Ply wood strip 3x15x500 mm.
1 Ply wood strip 1.5x15x600 mm.
4 Aileron and Flap servo mounting
1 Throttle servo mounting
2 Firewall plate
1 Elevator and Rudder servo mounting
2 Gear door left and right
CARF-Models Spitfire
6
Canopy Assembly and Installation
The canopy should only be installed
after all the work on the inside is
complete to avoid damaging it. Using
a Dremel tool, trim the excess
material from the canopy frame as
shown in the photo. Do not cut out
the window opening at this time.
Sand rough edges from the inside of
the canopy frame where it will contact
the fuse. An easy way to center the
frame to the fuse is to use a piece of
masking tape. Align the tape with the
bottom of the cockpit opening in the
fuse and mark down from the top
7/16”(10mm). Use this as a guide to
center the canopy in the rear. In the
front, measure the distance from the
outside edge to the center of the fuse.
Once the canopy frame is centered,
mark it at the center line of the fuse.
Remove the tape from the sides of the
fuse and reinstall the canopy frame.
Line up the marks to the center line
and move the frame fore and aft to
the best fit to the fuse. Once in place,
tape the canopy frame to the fuse in
the front and rear only. Using
masking tape, outline the position of
the frame on the fuse. This will help
with alignment later and help keep
glue from getting on the fuse when
installing the canopy.
After the canopy frame is fit to the
fuse, carefully cut out the window
openings. Take your time here as the
frame will be delicate until the canopy
is glued in. With the windows cut out,
sand the rest of the inside canopy
frame for better adhesion of the
canopy. For the best fit, the windows and the bubble canopy will be cut apart and
installed individually. continued
CARF-Models Spitfire
7
Canopy assembly and installation cont.
Carefully cut out the windows and
canopy so as to have about
1/8”(3mm) overlap on the inside for
gluing. Once you are satisfied with
the fit, scuff the area of the windows
that will mate to the frame. Work from
the inside using Plasti Zap and a fine
glue tip Note Do not use an
accelerator when gluing windows or
the clear windows may fog. Starting
with the front window, slowly work
your way around the window making
sure to get no glue on the outside
Repeat for the two side windows and
the bubble canopy.
After all the windows and the canopy
are glued in to the frame, the canopy
can be installed on the fuse. Note, if
you plan to install a cockpit, you may
want to do so before installing the
frame. The canopy in our prototype
will be glued in place using a slow
setting epoxy. Using the masking
tape applied earlier as a guide, scuff
the mating area of the fuse where the
canopy will attach. Glue the frame to
the fuse and tape in place until the
epoxy cures.
CARF-Models Spitfire
8
Cowl Installation
The cowl is already fit to the fuse at
the factory and only requires a small
amount of work to complete, Test fit
the cowl to the fuse. A small amount
of sanding may be necessary at the
aft end of the cowl for a perfect fit
Once satisfied with the fit, tape the
cowl to the fuse. The cowl is held in
place with nine 3mm by 20mm
screws and blind nuts. Starting at
the top, drill an 1/8”(3mm) hole at
the seam, in line with the scale
dummy screws. Install screw and
blind nut and tighten. Continue
working your way down installing
screws after each hole is drilled to
maintain proper alignment. Remove
the cowl. On the inside of the fuse,
scuff the area around the holes you
just drilled. The blind nuts are install
to the fuse with the flat part of the nut
against the fuse. The blind nut is
held in place with fiber reinforced
epoxy built up around the nut. Install
the cowl and tighten all screws.
Apply epoxy as shown in the photo
and allow glue to cure. Use photo
below as a guide to cut out the hole
in the front of the cowl, the cooling
holes and exhaust holes if
necessary. Leave about 3/8”
(10mm) around the outside for
support.
CARF-Models Spitfire
9
Firewall and Engine Installation
There are many engines and
exhaust combination that will work in
the Spitfire, including a soon
available canister system for the DA
85. This is intended as a guide and
the measurements for your engine
may differ The engine we will install
in our prototype is a DA 50 with a
pitt’s style muffler and will provide
very scale performance. NOTE, If
you intend to use a canister exhaust
be sure cutout cooling holes in the
fuse for air to exit.
The plywood firewall is precut and
ready to install. Scuff the back side
of the plywood and the nose of the
fuse with 50 grit sandpaper. Use a
slow drying epoxy or laminating resin
to glue firewall in place. Tape and
allow to cure.
The seam in the fuse will provide us
with the vertical center line. Mark
this onto the firewall, To find the
horizontal center line, use a straight
edge on top of the fuse and measure
down 80 mm. Use a square from the
vertical line to transfer the horizontal
line to the firewall. This is the exact
center point and measurements for
the engine mounting holes will be
made from these lines. Your engine
manufacturer may have a template
you can use to easily mark your bolt
hole positions, if not this is can be
done with a few measurements.
Measure the distance of your engine
mounting holes from center to
center. Using the photo as a guide
transfer the measurement to the
firewall.
CARF-Models Spitfire
10
Horizontal Stab Installation
The horizontal stab will be install
using a slow setting, fiber reinforced
epoxy. Start by test fitting the stab
into the fuse. The stab is installed by
sliding it in from the side, not the
back and without the elevators
installed. Install a ball link into the
elevator control horn, and then
mount the elevator onto the stab with
the 1mm wire provided. The control
horn will center the stab in the fuse
as shown in the photo. A
measurement will be taken from the
center seam of the fuse, at a panel
line to the tip of the stab which will
insure the stab is perpendicular to
the fuse. Compare the
measurement from side to side
moving the front of the stab until both
sides are equal. With the stab in
position, apply tape to the stab
around the fillet making alignment
easer when gluing the stab in later.
Install the wing. This will help us to
check the horizontal alignment.
Looking at the plane from the rear,
make sure the stab is parallel with
the wing. Once satisfied with the fit,
remove the stab. Using the tape as
a guide, scuff the area of the stab
that will be glued to the fillet. Also,
scuff the inside of the fillet
The stab can now be installed and
glued in. With the stab installed,
slide it rearward about 1inch. This
will expose the glue area of the stab.
(see photos on next page) We
would recommend a slow setting
epoxy here to allow plenty of working
time. Apply glue to the stab and to
the areas of the fuse you have
access to. continued,
CARF-Models Spitfire
11
Horizontal Stab Installation continued
Slide the stab back into position and
recheck all measurements, then tape
into position. A small fillet of glue on
the inside of the fuse is
recommended for a stronger bond.
We use a small syringe with a piece
of brass tubing attached to apply
glue to the inside of the fuse.
Control surface/servo installation
Before we install the control
surfaces, we need to install the tail
servo tray. The servo tray is
installed right behind the rear wing
mount support, about 4”(101mm)
down from the rear wing saddle.
Scuff the contact area of the fuse
and the edge of the mount. Spot
tack in place with CA, then glue in
place with a bead of reinforced
epoxy. After the glue cures, install
the servos as shown in the photo.
Note that the elevator servo is
installed from the bottom to allow
room for the rudder servo arm to
clear. We now need to construct the
elevator push rod. The push rod is
made up from a one meter long
carbon rod included in your kit. You
may need to cut the rod to length so
test fit it before you proceed. Start
by drilling a 3mm hole in the carbon
rod about 5/8” from the end. Drill slowly as not to crack the rod. Continued
CARF-Models Spitfire
12
Control surface/servo installation cont.
Take a two inch piece of 3mm
threaded rod and bend the end as
shown. Scuff the last one inch of the
rod on both the inside and outside.
Insert the 3mm rod and tack glue
with CA to hold it centered in the
carbon rod. We wrapped the last
one inch of our rod with thread
soaking it with thin CA for extra
reinforcement. Reinforced epoxy
should be worked in to the end of the
tube with a T-pin working your way
around the 3mm rod. Be sure to
clean off the excess glue from the
threaded rod.
Once the glue has cured, install a
3mm ball link onto the threaded rod.
Bolt the ball link to the elevator with a
3mm screw and lock nut. Now the
elevator can be installed. Insert the
control rod through the hole in the
rear and guide up to the servo while
aligning the elevator. The elevator is
hinged with a 1mm rod cut to length.
Guide the rod through the elevator
and the holes in the hinges. The rod
can be held in place with a small dab
of epoxy. Should you need to
remove the elevator later you can
just grind out the epoxy. With the
elevator installed, you can now hook
up the elevator servo using a ball link
bolted to a servo arm. After the
elevator is installed we can install the
rudder.
NOTE: Use a piece of scrap
plywood to make a support for the
elevator pushrod about half way
back and mount it to the fuse.
The only work required to the rudder is the installation of the control horns.
Continued
CARF-Models Spitfire
13
Control surface/servo installation cont.
You must first mill the holes in the
rudder. Measure up from the bottom
of the rudder 2 3/8” (60mm) and
back from the front 3/4” (19mm) This
will be the front lower point of the
slot. The slot will be parallel with the
horizontal panel line on the rudder.
Mark back from this point 5/8”
(16mm) and up 1/8” (3mm). The slot
will go all the way through the
rudder. With the slot milled, we can
fit the control horns. Slowly trim the
control horns until they protrude from
the rudder 5/8” (16mm) The controls
horns should touch together in the
center of the rudder. The rear of the
horn will be trimmed so the control
horn can angle forward slightly.
Check proper alignment by viewing
from the front and bottom of the
rudder. When happy with the fit,
glue the horns in with fiber reinforced
epoxy and allow to cure.
We can now install the rudder. The
rudder is held in place using the
same method as the elevator. After
the rudder is installed we can run our
pull-pull cables. On our prototype we
ran the wires directly to the rudder
without the use of a clevis for a more
scale appearance. Keep in mind if
you do it this way the cables will
need replacement if you need to
remove the rudder. The holes for the
pull cables will be aligned with the
control horns 3”(76mm) from the
front of the horn. Mark and drill an
1/8”(3mm) hole in the fuse at this
location. With a small file, slowly
work the hole into a slot in the fuse.
(see photo). Continued
CARF-Models Spitfire
14
Control surface/servo installation cont.
A piece of 1/8”(3mm) plastic tube
can be used as a cable guide. Glue
the tube to the fuse and run the
cable. Use two tension adjusters to
attach the cables to the servo control
arm. Note we are using the inside
holes for the cables. The two
springs in the photo are used to
control our tail wheel assembly.
Wing assembly (Landing Gear)
We’ll start with the installation of the
landing gear. Please note our proto
type did not have the wheel wells
pre-installed at the time this manual
was written. Assemble of the strut
requires only installation of the
wheel. Temporarily install the axle
into the wheel and onto the strut. It
may be necessary to install some
spacers for proper wheel clearance.
Once satisfied mark the axle, remove
and cut to length. Grind a flat spot
on the axle for the set screw and reinstall. The strut can now be
installed into the retract mechanism.
Wheel alignment can be done with
the wings Installed on the fuse.
The mounts are pre-installed and
only require drilling the holes for the
retract unit. It may also be
necessary to remove a small amount
of material from the former to allow
clearance for the strut. Note the
small cutout in the LG mount right
behind the retract to allow the air line
to pass. The mechanism is mounted
as far outboard as it will go in the
hole. When satisfied with the fit,
mount the retract unit with 8, 6-32 wood or sheet metal screws.
CARF-Models Spitfire
15
Wing assembly (Strut Covers)
The strut covers were not
available at the time this manual
was written. These instructions
will help with the installation of
your covers. The landing gear
comes with four brackets that
will be used to attach the cover.
NOTE the lower gear door
bracket needs to be installed
over the lower strut retaining pin
to hold it in place or the pin will
fall out Temporally install the
brackets on the strut and install
the landing gear into the wing in
the fully retracted position. Use
a straight edge across the
opening in the wing for the strut.
Take a measurement from the
straight edge to the mounting
bracket. This will be the size of
the spacers needed to mount
the cover. Use the photos as a
guide to help you understand
this procedure. We used brass
tubing for our spacers. Start
with the spacers a little on the
long side and sand to the
correct length for a good fit of
the cover.
CARF-Models Spitfire
16
Wing assembly (Servo mounts)
Do not change the order of the
following steps. The flaps and
ailerons are pre-hinges at the factory
and only the servos and control
horns need to be installed to
complete. Let’s start with the
assembly of the servo mounts.
Please take care to scuff all mating
areas that will be glued and use only
a fiber reinforced epoxy. Failure of a
glue joint here is not an option. Use
the top photo as a guide to identify
the parts. The lower part (right) will
be assembled and glued to the top of
the wing. The upper part (left) will be
mounted to the lower part using two
3mm screws and blind nuts.
The lower part is made up from two
pre-cut parts and two strips that we
will cut from a piece of 1/8” (3mm) X
1/2” (13mm) plywood. Install the two
blind nuts as shown in the photo.
Glue together the two pre-cut parts
and the two side strips and clamp.
Assemble the upper mount by tack
gluing the parts together with CA and
then applying a bead of epoxy to all
joints as shown.
Wing assembly (control horns)
The control horns will be installed
next as they are used as a guide for
servo installation. Apply masking
tape to the inboard, bottom side of
the aileron Make a line 1”(25mm) in
from the inboard end of the aileron.
From the aft edge of the aileron,
measure up 4 1/8” (105mm). This
will be the forward inside point of the
hole for our control horn. From here measure in 1/8”(3mm) and back 5/8”(16mm).
Use a dremel to mill out the hole using care not to go through the aileron.
Continued
CARF-Models Spitfire
17
Wing assembly (Control horns)Cont.
Using a piece of card stock we’ll
make up a jig to align the aileron
control horn. Use the photo as a
guide. Measure back from the front
4 1/2”(114mm) and make a notch as
shown. From the same edge
measure back 1/8”(3mm) and up
from the bottom 3/4”(19mm). This
will be the location of the outer hole
in the control horn. Push a T-pin
through the paper at this location.
Be sure to keep the jig on the line
you made earlier or the control horn
alignment will not be correct. Adjust
the hole in the wing or the length of
the horn if necessary for proper
alignment. Be sure to have at least a
1/2”(13mm) of control horn in the
aileron. When satisfied, scuff the
horn and glue in with reinforced
epoxy.
Next we can do the flap control horn.
Note that the control horn is parallel
to the panel line on the wing, not the
hinge line for the flap. Also note the
panel line is 8 1/4”(209mm) from the
aileron. Transfer the panel line to
the flap as shown in the photo. The
hole for the control horn will be
1/4”(6mm)from this line and
1/4”(6mm) from the hinge line. Mark
for the cutout as shown in the photo.
The cut out is 5/8”(16)mm by
1/8”(3mm). We’ll use the jig made
for the aileron control horns and
remark it for the flap horn as shown.
Measure from the notch 3 1/2(89mm)
forward and up 3/8”(10mm) and
insert T-pin which will be the outer
hole in the flap horn. Make a mark
on the control horn at the surface of the flap. Use as a guide to cut the control
horn to length. There should be a 1/4”(7mm) left inside the flap for gluing.
Continued
CARF-Models Spitfire
18
Wing assembly (Control horns)Cont.
Tack glue the flap control horn in
place with CA and final glue with a
bead of epoxy on both the inside and
outside of the flap.
Wing assembly (servo pockets)
We now can mark and cut out the
holes for the servos. Let’s start with
the aileron. Apply masking tape to
the wing and transfer the line made
earlier for the control horn as shown.
This will be the edge of our pocket.
Measure from the aileron cutout in
the wing 4 3/16” (106mm) forward.
This will be the back edge of our
pocket. From here, mark the forward
line 2 7/8”(73mm) The width of the
hole will be 1 11/16” (43mm). Use
an Xacto knife to cut out the hole.
Many light passes with the knife will
result in a very clean cutout.
The flap servo hole will be the same
size. Use the photo as a guide to
locate the hole Apply masking tape
to the wing. Mark a line 1/4”(6mm)
from the panel line directly in front of
the flap control horn as shown. This
will be the edge of our pocket. From
the flap hinge line, measure up
3”(76)mm. This will be the back
edge of our pocket. Measure and
mark the remaining lines and cutout.
Aileron cutout marks shown above
Flap cutout marks shown above
Wing assembly (servo installation)
We will use the holes just cut as a
guide for the servo location. A
1/2”(13mm) servo arm is all that’s
required for the ailerons. Mount the
servo arm to the servo and mount
the servo to the servo mount, then mount to the lower section. Use the photo as a
guide for servo orientation,note the output shaft is in the rearward position.
Continued
CARF-Models Spitfire
19
Wing assembly (Servo installation)Cont.
The servo will be centered fore and
aft in the hole, The servo arm will
line up with edge of the pocket as
shown. Scuff the top of the wing
where the servo will be glued. Tape
the servo lead to the servo so you do
not get glue on it. and glue into
position. Use only fiber reinforced
epoxy here. Once the glue has
cured we can cut the hole for the
push rod
Use the photo as a guide to locate
the position of the push rod exit.
We’ll do the aileron first. Mark two
lines from either side of the control
horn to the servo arm. Measure
back from the servo pocket 7/8”(
22mm). This is the front of our hole.
Measure back from here 1
3/8”(35mm). Cut out slot for the
control rod. Use the 3mm threaded
rod supplied in the kit for the push
rod with 3mm clevises as shown.
Note the small relief on the wing, in
front of the control horn for additional
aileron throw.
Aileron shown above
Use the same method for the flap
control rod with the following
measurements. From the servo
pocket back, measure 1/2”(13mm) to
the front of the slot. From here
measure back 1”(25mm). Cut out a
slot and make control rod as you did
for the aileron.
We can now trim out the pockets for
installation of the cover. Use two
3/8” (10mm)strips of either 1/32”
plywood or poly ply along the sides
of the pockets. Be sure to only have 1/16 (1.5mm) showing in the pocket or you
will not be able to remove the servo. Apply a small piece to the front of the cover
as shown.
Continued
CARF-Models Spitfire
20
Wing assembly (Servo installation)Cont.
Use a 1/2’(13mm) square piece of
1/8” (23mm) at the rear of the pocket
to screw down the cover
Wing assembly (Pocket
reinforcement)
Do not skip this step, it is
necessary to reinforce the servo
pocket or flutter of the control
surfaces will occur. Using 1/4”(6mm)
balsa make up the reinforcements
as shown. Be sure the grain of the
balsa runs from the top skin to the
bottom. Use photo as a guide to
locate balsa blocks. Measurements
are shown in the photos as a starting
point. Light sanding of the block may
be required for a good fit. Once the
blocks are fit scuff the wings and
glue in place.
On the top side of the wing, 2 1/2”
(63MM) in front of the spar tube we
need to make an exit hole for the
wires and air lines. It’s best to split
the hole between the top and side to
make installing the wing easier. See
photos below
CARF-Models Spitfire
21
Wing assembly (Aileron
installation)
The aileron is held in place with a
1mm rod. Make a Z bend in the end
of the rod as shown in photo.
Working through the opening under
the flap, use a small bead of epoxy
to glue the pin to the top of the wing.
Tail wheel Installation
CARF offers a lightweight
composite tail wheel assembly. A
few photos are included to aid in
installation of this unit. We chose an
optional steerable tail wheel for our
prototype. An access hole needs to
be cut in the rear for installation of
the tail wheel. Care must be taken to
reinforce the rear of the fuse after
cutting the hole. An 1/8 piece of
plywood will need to be cut to fit in
the location shown and will be
attached to two hardwood rails glued
to the side of the fuse. See photos
below for details
CARF-Models Spitfire
22
Finishing Up
On the left side of the fuse, right
under the canopy is an outline of the
door used to enter the plane. We
decided to hinge and use it as a
place to hide the switches and other
miscellaneous service components.
A small piece of music wire is run
through the fuse and out the bottom
to hold the door closed.
As with most scale airplane, and
depending on your engine and
equipment choice. Your spitfire will
most likely require some nose
weight. Since we decided to use a
light weight Da-50 and the heaver
steerable tail wheel in our prototype,
we had to add about 4 lbs. The
photo to the right shows a mount we
made up to get the weight as far
forward as possible Even with this
weight we came out at only 30lbs.
We made two equipment trays out of
scrap 1\8” (3mm) light plywood.
Make sure the fuel tank is centered
or ahead of the CG line. We
centered ours and it seems to work
fine. Your equipment install may
differ depending on the engine and
exhaust you choose.
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Set-up and flying your Spitfire,
CG
The Spitfire will be balanced inverted using the panel line on the top of the wing
that runs from tip to tip. This is the exact balance point for the Spitfire and the CG
should not vary from this line.
Control throws
We set up the ailerons and rudder on our proto-type for maximum throw with
about 30 percent expo for the first flights. The Spitfire requires very little elevator.
Measuring from the trailing edge of the elevator, we had about 1/2”(13mm) of
throw on our low rate setting and 1”(25mm) on high rate. We found the low rate
setting to be more than enough. The flaps on the full scale Spitfire are used only
for landing with 85 degrees of throw. We setup ours the same.
Flying your spitfire
We found our proto type with a DA 50 has more than enough power and is very
easy to fly The tail of the Spitfire will start flying very soon after it starts moving,
Do not assume this means that it is ready to fly. Allow the plane to continue to
build speed until it lifts off. Flaps are not required for take-off. We found our
Spitfire to be very predictable and to have no tendency to stall. A small amount of
elevator trim will be required with the flaps down. Do not stop flying the Spitfire
until the tail wheel is back on the ground, doing so may allow the plane to nose
over and the prop may hit the ground.
CARF-Models Spitfire
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