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In the interests of your own safety and that of others, the model must only be operated by experienced, disciplined
modellers with sufficient specialised expertise, and it must be serviced and maintained regularly and competently. If
you have no experience in building and operating models of this type, it is vital that you enlist the help and advice
of an experienced jet modeller if you are to avoid potentially catastrophic errors; this applies in particular to the jet
engine itself, which should only be run when an experienced operator is present. If you have a model flying group
or club in your area where training and support are available, we strongly recommend that you join that group. With
this model any defect or deficiency in its construction or operation can result in serious personal injury or even
death.

CAUTION!
Before you operate this model aircraft, you must determine the local by-laws and regulations which apply to you. In
legal terms our models are classed as aircraft, and as such are subject to legal regulations and restrictions which
must be observed. Contact your Rep regarding the AMA Regulations for turbine powered aircraft.

WARNING!
It is your responsibility to protect others from possible injury. Keep a safe distance from residential areas in order to
protect people, animals and buildings: at least 1.5 km “as the crow flies”.
Keep well clear of high-tension overhead cables. Don’t fly the model in 

poor weather

, especially when there is 

low

cloud cover 

or

 fog

. Don’t fly the model directly 

into the sun

, as you could easily lose visual contact with the

model. To avoid collisions, always keep well clear of full-size aircraft, whether manned or unmanned. It is your
responsibility to land immediately if a real aircraft approaches.

When operating a jet engine you must keep people and animals in a safe distance from it. This means:

In front of the engine

4.5 m

To the side of the engine 7.5 m
Behind the engine

4.5 m

WARNING!
The operator of the model must be in full possession of his or her bodily and mental faculties. Operating a model
aircraft under the influence of alcohol or drugs is not permissible under any circumstances. This applies both to the
operator and to his or her assistants.

WARNING!
Radio-controlled model aircraft may only be used for the purpose intended by the manufacturer. They must never
be used as machines for carrying people or goods, nor for any other purpose except as model aircraft. Misuse of this
model may result in serious personal injury or even death.

WARNING!
It is important not to make any modifications of any kind to the model. If you deviate from the instructions, perhaps
by using different components or materials, or by making changes to the structural design, you may seriously affect
the ability of the model aircraft to function correctly. Please resist the temptation, and build the model exactly as
directed.

WARNING!
Before you fly the model it is essential to check the Centre of Gravity and the control surface travels, as stated in
these instructions. These settings are very important, and our recommended values must be observed. Before you
fly the model, carry out a careful check of all the working functions and all the control surfaces. Check the range of
the radio control system with the transmitter aerial collapsed. If the check is satisfactory, repeat it with the engine
running, with an assistant holding the model securely. Read the instructions supplied with your radio control
system, and make sure that you observe the manufacturer’s recommendations.

safety instructions and warnings

Summary of Contents for Yak-55 SP

Page 1: ...Ultimate RC Aerobatic Contest Aircraft Span 3 31 m 131 Length 2 95 m 115 Weight 18 5 20 kg 40 44 lb Preliminary Assembly and Setting Instructions Yak 55 SP ...

Page 2: ... is your responsibility to land immediately if a real aircraft approaches When operating a jet engine you must keep people and animals in a safe distance from it This means In front of the engine 4 5 m To the side of the engine 7 5 m Behind the engine 4 5 m WARNING The operator of the model must be in full possession of his or her bodily and mental faculties Operating a model aircraft under the in...

Page 3: ...operating 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 Composite ARF 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 expe...

Page 4: ...c servo tray Then plug the servos into your receiver and center them precisely Now glue the extension servo arms to the servo discs Use CA glue Steel rulers laid on the servo horns help to allign them BEFORE you glue them on All servos center slightly different You MUST center the servos first before you glue the horns on The horns must be 100 parallel Then take the disc of the rear servo off and ...

Page 5: ...cut a little slot into the phenolic servo tray aside each servo you can feed the wires through and the whole unit is unmounted and removed from the wing within sec onds for maintainance or adjustments Now slide the whole unit into the wing and fix it with 14 servo screws Check the servo arm cut out in the bottom wing surface and re shape it if necessary Now install the ball link into the aileron c...

Page 6: ...m rigid and stiff Mount the servos rock hard to the phenolic tray and mount the pheniolic tray with the rubber soft mounts in the stab Make sure again that the servo arms are 100 parallel this only can be done by centering the servos with the receiver FIRST and then glue the phenolic servo horns on the servo disc Use 2 small sheet metal screws to secure the phenolic arm to the servo disc Elevator ...

Page 7: ...e the servo discs off again You cannot insert the servo tray with the arms mounted After the servo tray is in place then you can mount the servo arms to the servos and tighten the center screw Use thread locker to make sure that they don t come loose ...

Page 8: ...ht have to re shape the cutout slightly You can get a 45 50 deg throw on the eleva tors Very important Make sure that the slot in the stab is WIDE ENOUGH so that the e rings on the aluminum pins cannot stripped of by touching the cutout borders ...

Page 9: ...2 long all threads and the 4 ball links This setup is sufficient when you use the Volz Alustar Digital servos On top of that main drive both servos get a coupling to another backup servo which is connected to the main disk of each main servo But and this is important these 2 backup servos are NOT connected with each other This allows a better fine tuning for centering Start with screwing the 4 ser...

Page 10: ...d paper to prepare the glue surfaces Use thin CA glue Then attach the top horn to the servo disc and the small phenolic doubler Attention The top servo horn has the addi tional horns for servo No 3 and No 4 Both sides are in mirror so check carefully which horn you glue to which side the additional arms point backwards and the slot for the pull pull cables must point forward This means the 2 big d...

Page 11: ...ttom horn with a dot of 5 minute epoxy so that you can tighten the M3 screws properly the small horns are con nected with standard clevises It is on purpose that the holes in the discs are slightly bigger than the pin of the clevis This takes any possible tension out of the system Now insert the unit into the main fuselage board and fix it with the supplied sheet metal screws Install the pull pull...

Page 12: ...imple pipe mount ing the adjustable wing and stab mount should be fixed permanently when you are satisfied with the adjustments during the first flights Especially I do not trust the carbon thread for more than a few hours of engine vibration so after you set the incidence perfectly fill the outer area of the hole with Silicon this still allows to get it off one day and readjust if needed This win...

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Page 16: ...own up down Aileron 75 90 110 130 at root Rudder 135 135 160 160 counter blalance L E Elevator 60 60 150 150 couter balance L E Incindences We determined the wing to be 0 4 0 5 deg positive and the stab to be 0 2 deg negative this can be achieved by setting the rear wing dowel to approx the center of the slot and the front pin of the stab approx 1 1 5 mm down Thrust The Yak 55SP needs remarkably l...

Page 17: ...is missing or inadequate We tried to offer this airplane as complete as possible Please let us know you will help us to continue making good things better You purchased a Yak from the very first production run If you notice any problems or have improvement ideas this is more important than ever that we know this immediately So we can make improvements quickly We try hard to improve our product con...

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