Skymaster PC-21 instruction Manual

Skymaster PC-21 instruction Manual
1/4 Scale Almost-Ready-To-Fly RC Model
Assembly and operations manual
Spesifications
Scale : 1/4
Weight : 18Kg
Length : 112.5”: (2850mm)
Engine : Jetcat SPT5
Span : 90 ”: (2288mm)
Radio : 12 Ch (8 servos)
The PC21 by Skymaster
The 1/4 PC21 produced by Skymaster is the result of years of R&D work and excessive testing. We are proud that
you have decided to buy the best ARF 1/4 PC21 in the market today. We hope you enjoy your PC21 Please note
that the photos show certain views from the prototypes. Some modifications and upgrades might have taken place
by the release of the model. We have tried to produce a very scale replica of this turbo prop. This manual describes
the assembling of “ PRO” model. Landing gear and doors are factory installed. Before you start building and setting-up your aircraft, please make sure you have read this instruction manual, and understood it. If you have any
questions, please don’t hesitate to contact us. Below are the contact details:
Office Taiwan:
No.15, Min-San 3rd Street, Ren-Wu Area, Kaohsiung, 814, Taiwan, R.O.C.
TEL: +886 9 3299 7923
FAX: + 886 7373 1215
http://www.skymasterjet.com
Sales : skymasterjets@hotmail.com
Technical support : morne.m@pixie.co.za
SM © 2015
Assembly & Operation Manual
Index:
INTRODUCTION....................................................................................................................................... 3
DISCLAIMER..............................................................................................................................................3
WARNING…...............................................................................................................................................3
ARF PAINT.................................................................................................................................................4
FINISHING YOUR MODEL........................................................................................................................4
HANDLING & TRANSPORTING ...............................................................................................................5
TOOL LIST................................................................................................................................................ 6
HEALTH…..................................................................................................................................................7
GENERAL ASSEMBLY TECHNIQUES..................................................................................................…7
RADIO EQUIPMENT & ACCESSORIES…………….................................................................................8
KIT CONTENTS…….……………...............................................................................................................9
OPTIONAL PARTS………………..……………….....................................................................................10
WING..……………………………………………………………………………………………………………...11
STABILIZER & RUDDER……................................................................................................................. 12
FUSELAGE ………………….........................................................................................,,............ ………..13
FUEL CELLS…………………………………………………………………………………………………...…14
FUEL DIAGRAM………………………….………………………………………………………………………15
AIR SYSTEM .......................................................................................................................................... 16
AIR DIAGRAM......................................................................................................................................... 17
TURBINE INSTALLATION……………………………………………………………………………………....18
COCKPIT & CANOPY…......................................................................................................................... 19
EQUIPMENT INSTALLATION …………………………..…...…….............................................................20
BEFORE YOU FLY.................................................................................................................................. 21
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Assembly & Operation Manual
INTRODUCTION
Thank you for purchasing Skymaster arf pro pc21 We have put a lot of effort and time into this model.
We at Skymaster strive to be a market leader in the ARF— jet market. We were the first company to
produce ARF—jets in the world and we would like to continue being amongst the best. Although we
have made every effort that this model was fit for shipping, we would like you to inspect the contends
and call your nearest dealer immediately if any defects or missing parts are spotted! This manual will
allow you to duplicate the factory prototypes.
LIABILITY
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 Skymaster 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 Skymaster 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 Skymaster, 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 Skymaster
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.
WARNING
This ‘jet’ 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 jet according to the AMA rules, or those laws and regulations governing model flying in the country of use.
The engine, landing gear, servos, linkages and control surfaces have to be attached properly. Please
use only the recommended servos and accessories. 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. A tail heavy
plane can be an enormous danger for you and all spectators. Fix any weights, and heavy items like batteries, very securely into the plane. Make sure that the plane is secured properly when you start the engine. Have a helper hold your plane from the nose before you start the engine. Make sure that all spectators are far 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 1st 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 the engine, run at
about half throttle and repeat this range check. Make sure that there is no range reduction before ‘failsafe’ occurs. If the range with engine running is less then with the engine off, please DON’T FLY at that
time. Make sure that your wing spar tube is not damaged. Check that the anti-rotation dowels for the
wings are not loose. Check that the wing, stab, fin and nose retaining bolts are tight. Please don’t ignore
our warnings, or those provided by other manufacturers. They refer to things and processes which, if
ignored, could result in permanent damage or fatal injury. Secure the plane before starting engine.
P-3
Assembly & Operation Manual
ARF Paint
The color finish on your Skymaster PC21 arf pro model was applied out of the mould.
We have used only the highest standard automotive paints to finish your model.
Should you damage the finish, Skymaster stock the color paint and hardener required
for the repair. A good automotive spray painter should also be able to mix and supply
the correct samples for repair.
If you have no experience in the use of these paints, it will be best to seek assistance.
Do not leave your model unprotected in the sun! always cover your model or park it in
the shade. Extreme temperatures will damage the paint!
Finishing Your All White PC21 ARF PRO
It is always best to fully assemble the model before painting. By doing so no damage
or glue prints will ruin the paint.
The all white model will have some release agent on the surfaces.
Use #1000 wet and dry paper to sand the entire model. Mould lines can be sanded
and filled using normal automotive fillers.
Please be extra careful when sanding near the hinge line! The hinges can easily be
damaged. When masking and painting please make sure the control surfaces are not
bend past 90—180 degrees extensively. This will cause the hinges to crack and may
cause flutter.
The rudder and clear canopy are not installed. It is best to install these components
after painting was done.
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Assembly & Operation Manual
HANDLING & TRANSPORTING
Composite models are very light but strong. These characteristics do have a down side!
It is brittle.
Take care when handling your model. DO NOT ATTEMPT TO PICK UP AN FULLY FUELED
MODEL BY THE LEADING EDGE BY YOURSELF! The leading edges will crack and delaminate. Full size jets have specially marked access points for the hooks of cranes!
Inspect your model before and after a rough landing. Make sure all parts are safe and sound.
Inspect model before and after transport. A sudden stop can easily cause an unnoticed dent!
We recommend to REMOVE the elevators and wings for transport. It will only take a couple of
seconds.
The wings and tails are very flight worthy structures. They are light and extremely strong , however, they will dent if mishandled. Always support these structures on clean soft foam rubber.
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Assembly & Operation Manual
Tools and Adhesives
Tools etc:
This is a fairly quick and easy plane to build, for a jet model, not requiring difficult techniques or special equipment, but even the building of Skymaster aircraft requires some
suitable tools! You will probably have all these tools in your workshop anyway, but if
not, they are available in all good hobby shops, or hardware stores like "Home Depot"
or similar.
1. Sharp knife (X-Acto or similar)
2. Allen key set (metric) 2.5mm, 3mm & 5mm
3. Sharp scissors, curved type for canopy
4. Pliers (various types)
5. Wrenches (metric)
6. Slotted and Phillips screwdrivers (various sizes)
7. Drills of various sizes
8. Battery drill and Dremel tool (or similar) with cutting discs, sanding tools and mills
9. Sandpaper (various grits), and/or Permagrit sanding tools.
10. Carpet, bubble wrap or soft cloth to cover your work bench (most important !)
11. Car wax polish (clear)
12. Paper masking tape
13. Denaturized alcohol, Acetone, or similar (for cleaning)
Adhesives:
Not all types of glues are suited to working with composite
parts. Here is a selection of what we normally use, and what we can truly recommend.
Please don’t use inferior quality glues - you will end up with an inferior quality plane,
that is not so strong or safe. Jet models require good gluing techniques, due to the
higher flying speeds, and hence higher loads on many of the joints. We highly recommend that you use a slow cured epoxy for gluing highly stressed joints, like the hinges
and control horns, into position and the most commonly used is ‘Aeropoxy’ (Bob Violett
Models, USA). The self-mixing nozzles make it easy to apply. It takes about 1 - 2 hours
to start to harden so it also gives plenty of time for accurate assembly. Finally it gives a
superb bond on all fibreglass and wood surfaces.
1. CA glue ‘Thin’ and ‘Thick’ types. We recommend ZAP, as this is a very high quality.
2. ZAP-O or Plasti-ZAP, odourless (for gluing the clear canopy)
3. 30 minute epoxy (stressed joints must be glued with 30 min and NOT 5 min epoxy).
4. Aeropoxy/Loctite Hysol 3462 or equivalent (optional, but highly recommended)
5. Epoxy laminating resin (12 - 24 hr cure) with hardener.
6. Milled glass fibre, for adding to slow epoxy for stronger joints.
7. Micro-balloons, for adding to epoxy for lightweight filling.
8. Thread-locking compound (Loctite, or equivalent)
At Skymaster we try our best to offer you a high quality kit, with outstanding value-for money, and as complete as
possible. However, if you feel that some additional or different hardware should be included, please feel free to let
us know.
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Assembly & Operation Manual
HEALTH
Use a mask (available at auto paint stores) to protect from inhaling the glass or carbon
fiber dust. Use this mask whenever you are sanding or cutting fiberglass or
carbon fiber materials. Use a charcoal filter paint mask (available at auto paint supply
stores) when spraying any primer or paint. Spray out of doors or in a properly vented
spray booth. Use safety glasses any time rotary tools, such as Dremel cut-off disc or
Perma-Grit cutters, are being used.
GENERAL ASSEMBLY TECHNIQUES
We recommend to wax the model before assembling. This will help protect the finish
from an epoxy finger print. Wax will not help for CA glues!
Extra glue, extra paint, extra resin will add up to a heavy model. Plan before you glue!
The glass cloth side of parts to glue, should be sanded with #80 grit paper for best
glue adhesion.
Support the fuselage on foam pads.
Skymaster makes every attempt to insure that the parts fit. However, due to manufacturing tolerances, some parts may fit a little tight. Always trial fit parts and adjust if
needed.
Only use high quality adhesives such as the ZAP products from Pacer Technology.
For extremely high stress areas we recommend “Aeropoxy.” It is the strongest and
best gripping adhesive we have found.
If fuel or grease are on the surface, first clean with acetone or thinners.
Clean off all excess glue—excess glue is excess weight.
Always check the outside skin of the model to look for any glue residue and remove it
with Acetone before it cures. “Aeropoxy” is tough to remove once it has thoroughly
cured.
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Assembly & Operation Manual
Radio equipment
Failure to use the recommended servos, output arms, extensions, and hardware
may result in a loss of control!
Throughout this manual we have used JR equipment. If you make use of another
manufacturer, please use equipment with similar specifications!
The model will require extension leads! Please use high quality extension leads.
The trend nowadays is to use dual battery management systems and dual RX equipment. Using S-bus or X-bus will simplify your installation. Consult your radio manufacturer for further detail.
Always center and install the correct output arms while on the bench, once the servo is
in the aircraft access to the servo arm screw is sometimes limited.
Do not save any money when buying radio equipment. The price of servo’s are far
from the price of replacing the entire model.
REMEMBER: The best equipment is only as good as the weakest link. Ask yourself if this servo or link or lead etc is worthy of my trust to protect my very large
investment...
Accessories
1. 2 DS8911 servo’s for the elevator.
2. 2 DS 8911 for ailerons + 2 DS 8911 for Flaps
3. 1 DS8911 for rudder
4. 1 JR8511 steering servo.
5. 2 x 2way valve + 1 x 1way valves + sequencer for landing gear + doors + brakes
6. Powerbox Royal with build in matchbox function.
7. Pneumatic support set for landing gear
8. 1 x Turbo prop motors, with power 5kW with accessories.
9. Fuel tubing, Hopper tank (or BVM UAT), festo fittings, fuel filters, fuel tube etc
10. Cable ties in various lengths.
11. Radio system with S-bus or X-bus technology (will simplify the radio installation)
Did you understand everything in this manual completely?
Then, and only then, let’s start assembling your model. If not, please read it
again before you start the assembly.
P-8
Assembly & Operation Manual
Kit Contents
Picture A
PC21 ARF PRO Contents:
Picture A
Fuselage front and rear section.
Fin + Rudders & engine hatch.
Nose gear + Main gear + doors installed
Wings left and right + flaps + aileron
Elevator left and right
Flap horns fearings
Canopy assembly + glass
Wing tube
Stabilizer tubes (2)
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Assembly & Operation Manual
OPTIONAL PARTS
3 x Air Tanks
1 x Retract Valve
2 x Filler & 2 x Pressure Gauges
1 x Electronic Brake Valve
5 x Air Tubing, 10 x Quick Disconnect
8 x T-pieces
Photo 2
Fuel Tank
Accessory Set
Photo 3
Photo 4
L/G hydrolic set
Photo 5
Jettronic 2way & 1 way valve
& Sequencer
Control Brake, Gear and Doors
Photo 6
Cockpit + Pilot
5 Blade Prop
Photo 7
Photo 8
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Assembly & Operation Manual
WINGS
NOTE: Make sure to have some sort of protective foam on the work bench. This will
protect the paint surface from unwanted dents. Assemble both wings simultaneously.
Mark √ each step.
Photo 9
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Photo 10
Photo 11
Use masking tape to keep flap in position. Mask off area for carbon hinges.
Assemble 2 pr carbon hinges and mark slots for carbon hinges onto wing.
Dremel slots for hinges and glue hinges to both flap and wing.
Make sure hinge points are all aligned and high of each hinge same.
When dry—trail fit the hinge fairings. Glue in place.
Secure flap servo with aluminum brackets.
Mark slots for flap pushrod. Dremel slots to clear pushrods.
Photo 12
Glue flap horn to flap—note—make sure horn is secure into balsa in flap.
Install pushrod and check operation of flap. Set flap travel as shown. 38mm
Secure aileron servo with 2 aluminum brackets.
Cut slots for pushrods.( Note—Internal pushrods are
shown. You may use external pushrods.)
Glue aileron horn to aileron. Make sure horn is glued
into balsa block into aileron.
Photo 13
Fit pushrod and secure cover.
Repeat for other wing.
Photo 14
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Assembly & Operation Manual
ELEVATORS & RUDDER
NOTE: Use some protective foam on the work bench to protect the paint surface from
unwanted dents. A removable elevator mechanism is installed. Mark √ each step.
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Fit servo horn and centre servo using radio. Remove horn. Mark location of horn.
Dremel hole to clear horn, refit horn.
Fit horn to servo bracket via root of stab.
Mark location for elevator horn.
Cut slot for horn.
Glue horn with 5 minute epoxy. Make sure the horn is glued into balsa block located inside elevator.
Secure pushrod.
Repeat for other stab and Fin.
Fit stab with 2 carbon rods and secure with bolts
Fit fin and secure by clamping carbon rod.
Run 3 servo wires neatly in rear fuselage.
Photo 16
Photo 15
P-12
Assembly & Operation Manual
FUSELAGE
Photo 17
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Photo 18
Photo 19
Before joining the fuselage it is necessary to tidy up the servo wires. Make sure
wires are secure .
Tidy up the air line. Use quick disconnects between wing and fuselage.
Check operation of landing gear and doors.
Install JR DS8511 steering servo. Bolt with 4 x M3 bolts and lock nuts.
Centre servo and connect to actuator.
Secure rear fusealge with 6 screws.
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Assembly & Operation Manual
FUEL CELLS
NOTE: Bad plumbing lead to flame outs. This will destroy your model. Please take your
time and do a good job.
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Make up fuel line fittings. Make sure clunk moves freely and reaches all corners of
inside of tanks.
Fit to main tank. Mark pipes for “inlet” and “outlet”.
Plumb tank using diagram on next page.
Fill tank and check for leaks. Secure tank with ply bracket and 2 bolts.
Drain tank with turbine fuel pump and check no air bubbles in system until last drop
is drained. A good plumbing will secure good turbine operation.
SMOKE TANK:
Note : Optional smoke tank can be installed in front of turbine!
Photo 20
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Assembly & Operation Manual
FUEL CELL DIAGRAM
Photo 21
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Assembly & Operation Manual
AIR SYSTEM
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You will need 2 x 2way and 1x 1way + sequencer.
All work done at factory.
Glue the air tanks (3) with silicon
Use quick connectors on fuselage joints to help
with break up of model if glued in tail.
Fit the 3 filler valves and 3 pressure gauges
onto plywood tray.
Plumb the landing gear, door and brake system
by using color air tubing. T all same color
tubing together until a single pipe emerge.
Fit electronic valves + sequencers on tray.
Photo 22
The air system will consist of :
Air up, Air down retracts (2)
Air up, Air down door (2)
Air out brakes (1)
Air filler input (3)
Total of 8 pipes
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Air leaks can damage your model! Please do a thorough check for air leaks. Make
sure the system can hold pressure for at least an hour in the up and down position.
Do not rush this installation.
Photo 23
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Assembly & Operation Manual
AIR DIAGRAM
P-17
Assembly & Operation Manual
TURBINE INSTALLATION
You will need to cut fuselage to clear exhaust of turbo prop.
Make sure spinner have enough clearance.
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Please follow the instructions supplied with your turbo prop.
Run all turbine wires and power cables on opposite side of servo wires.
Install fuel pump close to UAT. We recommend to make use of a mechanical shut
off valve as well.
Use correct propeller for your turbo prop.
Photo 24
Photo 25
Photo 26
Photo 27
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Assembly & Operation Manual
COCKPIT AND CANOPY (after painting)
Photo 28
Photo 29
Photo 31
Photo 30
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Cut cockpit to fit fuselage.
Secure rear of cockpit with 2 screws.
Check that canopy clear the cockpit. Trim if needed.
Install pilot.
If you ordered the all white—you will need to cut glass and glue after painting.
Use non CA glue to glue glass to frame. Use canopy glue!
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Assembly & Operation Manual
EQUIPMENT INSTALLATION INTO PC21
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1.
2.
3.
4.
5.
6.
7.
Equipment installation is a personal venture. There is one golden rule: Do it as neat
and logical as possible! This will make fault finding and service of components easier. The pc21 basically consist of 7 circuits!
Servo wires
Power cables
Data cables
Pneumatic pipes
Air pipes
Fuel pipes
RX cable / Satellite Receivers
Please try and separate these circuits as far as possible. It is advisable not to run RX
cables near any kind of electrical fields. Make all switches and filler valves and charging sockets easy accessible. If you use S-bus technology it will simplify installation.
.
Photo 32
Photo 33
P-20
Photo 34
Assembly & Operation Manual
BEFORE YOU FLY
It is assumed that the builder of this kit has acquired the basic skills and knowledge necessary to make a safe and functional radio control installation into a
model. Therefore, these notes are intended only to assist that experience.
TRAVEL MAX SETTINGS:
1.
2.
3.
4.
Elevator
Rudder
Aileron
Flap
37
64
20
38
mm at T/E
mm each way
mm each way
mm see picture 12 page 11
Do not change location of CG unless you are experience and have some feel of
model before! CG = 175mm from leading edge
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Dry weight will be between 40 and 45 lbs depending equipment.
100—120 psi for pneumatic system
Make use of battery management system. Double up on batteries and make sure
all wired can carry current needed to operate.
Do a complete range check before flight. Do this with turbine running. Follow manufacturers instructions.
Set the maximum speed to 160mph! The prototype were tested with Kingtech turbo
prop turbines. This will be more than enough power for unlimited vertical performance.
Set a timer . It can safe your model.
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Assembly & Operation Manual
Take-Off
Do some taxi tests before your flight! Make sure you are familiar with all settings and
make sure the model track straight on the ground without rudder input.
Choose a fine day for the maiden flight. Select take off flap or flight mode 1 and open
throttle. Gently pull back on stick 15m down the runway. Raise the flaps and gear at
safe altitude. If the ailerons feel sluggish—select higher rate. Land and adjust to fit
your need.
Slow Flight
Most of the first flight should be utilized to get familiar with the slow speed flight characteristics. Select the flaps to the takeoff position; there should be no pitch change. Extend the gear and select full landing flaps; adjust the power to maintain level flight and
a speed of about 80—90mph. Climb to a safe altitude and slow the model to the edge
of a stall to know where that edge is.
Landing
Fly a complete circuit before landing. Approach from the downwind side and lower the
LG. Fly a complete circuit getting use to the power required. On the next circuit lower
the flaps. Just before touch down—pull more elevator to flare model. Let the model roll
out and apply brakes.
Taxi back and do necessary adjustments to customize PC21.
We at Skymaster wish you many happy flights with your PC21! Add some landing
lights for more realism.
Blue skies!
Anton Lin and Skymaster Team!
P-22
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