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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 compo-
nents. 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 Sky-
master company to pay compensation is excluded, regardless of the legal argument employed. This ap-
plies to personal injury, death, damage to buildings, loss of turnover and business, interruption of busi-
ness 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 air-
craft, 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 ac-
cording 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 bat-
teries, very securely into the plane. Make sure that the plane is secured properly when you start the en-
gine. Have a helper hold your plane from the nose before you start the engine. Make sure that all spec-
tators 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 re-
tracted, 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 ‘fail-
safe’ 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. 

 

 
 
 

 

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Summary of Contents for PC21 Arf Pro

Page 1: ...f PRO model Landing gear and doors are factory installed Before you start building and set ting up your aircraft please make sure you have read this instruction manual and understood it If you have an...

Page 2: ...EALTH 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...

Page 3: ...s 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 th...

Page 4: ...n 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 rui...

Page 5: ...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 sto...

Page 6: ...uality 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 recom mend that you use a sl...

Page 7: ...t 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 Skyma...

Page 8: ...m the price of replacing the entire model REMEMBER The best equipment is only as good as the weakest link Ask your self if this servo or link or lead etc is worthy of my trust to protect my very large...

Page 9: ...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 Stabi...

Page 10: ...2 x Pressure Gauges 1 x Electronic Brake Valve 5 x Air Tubing 10 x Quick Disconnect 8 x T pieces Accessory Set Fuel Tank Jettronic 2way 1 way valve Sequencer Control Brake Gear and Doors Photo 2 Phot...

Page 11: ...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 push rods Glue flap horn to...

Page 12: ...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 hor...

Page 13: ...dy 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 conn...

Page 14: ...rners 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 t...

Page 15: ...FUEL CELL DIAGRAM P 15 Assembly Operation Manual Photo 21...

Page 16: ...ystem by using color air tubing T all same color tubing together until a single pipe emerge Fit electronic valves sequencers on tray The air system will consist of Air up Air down retracts 2 Air up Ai...

Page 17: ...AIR DIAGRAM P 17 Assembly Operation Manual...

Page 18: ...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 shu...

Page 19: ...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...

Page 20: ...21 basically consist of 7 circuits 1 Servo wires 2 Power cables 3 Data cables 4 Pneumatic pipes 5 Air pipes 6 Fuel pipes 7 RX cable Satellite Receivers Please try and separate these circuits as far as...

Page 21: ...location of CG unless you are experience and have some feel of model before CG 175mm from leading edge Dry weight will be between 40 and 45 lbs depending equipment 100 120 psi for pneumatic system Ma...

Page 22: ...stics Select the flaps to the takeoff position there should be no pitch change Ex tend the gear and select full landing flaps adjust the power to maintain level flight and a speed of about 80 90mph Cl...

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