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Composite-ARF Yak-55 SP Assembly Instructions Manual

Ultimate rc-aerobatic contest aircraft
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Yak-55 SP
Preliminary Assembly and Setting Instructions
Ultimate RC-Aerobatic
Contest Aircraft
Span:
3.31 m (131")
Length:
2.95 m (115")
Weight:
18.5 - 20 kg (40 - 44 lb)

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Summary of Contents for Composite-ARF Yak-55 SP

  • Page 1 Yak-55 SP 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...
  • Page 2 safety instructions and warnings 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;...
  • Page 3 However, as manufacturers, we at Composite-ARF 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.
  • Page 4 Aileron Servo Setup Mount the servos in the servo tray. Use the M3x12 allen screw with stop nuts. Use the 3mm washer on top of the servo. Do NOT use the rubber soft mounts. Tighten the servos ROCK HARD to the phenolic servo tray.
  • Page 5 Finally use the small sheet metal screw (2 per servo) and secure the horns to the servo disc additionally. Now assemble the linkage between the 2 servos. Use the supplied aluminum clevises. The 2 clevises on the center servos have to be modified. Cut one arm of each clevis off, so that 2 clevises (one from the front servo and one...
  • Page 6 Elevator servo setup The elevator servo mount is very similar to the aileron system. Please use the same technique as described in the aileron section. It is important that the long rear servo arm is always doubled, to make the system rigid and stiff.
  • Page 7 After you installed and adjusted the linkage, take 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.
  • Page 8 Check the system for free movement. you might 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...
  • Page 9 Rudder Servo setup The 4-Servo rudder setup is also a quickly removable unit, to make service and adjustment easy. It will accept JR 8411 servos or any other brand. Complete hardware is included. It is important, as usual, that the servos are centered BEFORE the horns get finally mounted.
  • Page 10 The main horns are doubled for maximum safety and stiffness. Glue the bottom horn first, but make sure that the servos are centered (of course you can use a match box to get rid of that problem). then glue the small doubler to the bottom horn.
  • Page 11 Now, after all 4 servos are installed and centered, you can mount the servo horns. Test run the system, before you connect any linkages. Then install the linkages. The main ball links have to be installed first. Use the supplied hardware. Make sure that the nut does not hit the servo case.
  • Page 12 Here are some additional photos without further comments, how I set up my last prototype. These are just ideas, but most important is, that all heavy equippment must be as far forward as possible. The long tail and the huge stab, with all their advantages, ask their tribute...

  • Page 16: Control Throws

    The CG is widely changeable. Measured from the leading edge, just where it begins to go staight (outside of the filled): 270 - 350 mm 60 mm are adjustable by choosing either the front or the back mounting position. Another 20 mm are variable due to battery and other hardware components placing.
  • Page 17 This manual is the start to attempt a new level of Composite-ARF instructions, and we would like to complete all our products with this style instructions.