Seagull Models YAK 55 Assembly Manual
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Seagull Models YAK 55 Assembly Manual

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MS: 131
ASSEMBLY MANUAL
"Graphics and specifications may change without notice".
Specifications:
Wing span ---------------------------68.9in (175cm).
Wing area ---------------1026.1sq.in (66.2sq dm).
Weight --------------------11.5-14.3lbs (5.2-6.5kg).
Length ------------------------------64.8in (164.7cm).
Engine -----------------1.2 - 1.6 cu.in -----2-stroke.
30-35 --- gasoline engine.
Radio ----------- 6 channels with 6 digital servos.

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Summary of Contents for Seagull Models YAK 55

  • Page 1 MS: 131 ASSEMBLY MANUAL “Graphics and specifications may change without notice”. Specifications: Wing span ---------------------------68.9in (175cm). Wing area ---------------1026.1sq.in (66.2sq dm). Weight --------------------11.5-14.3lbs (5.2-6.5kg). Length ------------------------------64.8in (164.7cm). Engine -----------------1.2 - 1.6 cu.in -----2-stroke. 30-35 --- gasoline engine. Radio ----------- 6 channels with 6 digital servos.

  • Page 2: Kit Contents

    YAK 55. INTRODUCTION. Thank you for choosing the YAK 55 ARTF by SEAGULL MODELS. The YAK 55 was designed with the intermediate/advanced sport scale in mind. It is a semi scale airplane which is easy to fly and quick to assemble. The airframe is conventionally built using balsa, plywood to make it stronger than the average ARTF , yet the design allows the aeroplane to be kept light.

  • Page 3: Hinging The Ailerons

    www.seagullmodels.com KIT CONTENTS HINGING THE AILERONS. Note: Properly hinging the control surfaces on Fuselage this models is very important.Poorly Left wing panel installed hinges affect the model’s Right wing panel precision and control response and can Canopy also be dangerous. Tail set Aluminum wing tube 1) Sand each end of hinge point hinge...

  • Page 4: Hinging The Elevator

    Instruction Manual YAK 55. 4) Mix 30 minute epoxy or use Pace PT- 55 hinge glue. Place a sufficient amount of glue in each of the hinge pockets in one wing panel. 5) Press the aileron and wing together such that less than a 1/64”...
  • Page 5 www.seagullmodels.com INSTALL ELEVATOR CONTROL HORN. Fiberglass control horn INSTALL AILERON CONTROL HORN. Fiberglass control horn Elevator control horn INSTALL RUDDER CONTROL HORN. Fiberglass control horn Aileron control horn...

  • Page 6: Engine Mount Installation

    Instruction Manual YAK 55. Thread locker glue. Rudder control horn. ENGINE MOUNT INSTALLATION. 1) Locate the items necessary to install the INSTALLING THE STOPPER ASSEMBLY. engine mount included with your model. . 1) Using a modeling knife, carefully cut off the rear portion of one of the 3 nylon tubes leaving 1/2”...

  • Page 7: Fuel Tank Installation

    www.seagullmodels.com 6) When satisfied with the alignment of the stopper assembly tighten the 3 x 20mm machine screw until the rubber stopper ex- pands and seals the tank opening. Do not overtighten the assembly as this could cause the tank to split. FUEL TANK INSTALLATION.
  • Page 8 Instruction Manual YAK 55. Vent tube. Fuel fill tube. Fuel pick-up tube. 2) You have to trim each axle using a tool cutting and cut-off wheel. 9) Connect the lines from the tank to the Caution when cutting the axles and engine and muffler.
  • Page 9 www.seagullmodels.com 1) Using a small weight ( Weighted fuel pick-up INSTALLING THE MAIN ALUMINUM ) and string, feed the string through works well LANDING GEAR TO FUSELAGE. the wing as indicated. 3) The blind nuts for securing the landing gear are already mounted inside the fuselage. 4) Using the hardware provided, mount the main landing gear to the fuselage.
  • Page 10 Instruction Manual YAK 55. 6) Secure the servo to the aileron hatch using Phillips screwdriver and the screws provided with the servo. 7) Apply 1-2 drops of thin C/A to each of the mounting tabs. Allow the C/A to cure without using accelerator.

  • Page 11: Installing The Switch

    www.seagullmodels.com 2) Use a pin drill and 4mm drill bit to drill a INSTALLING THE SWITCH. small indentation in the mount for the engine mounting screw. Install the switch into the precut hole in the side of fuselage. 3) Use a drill to drill the four holes in the engine mount rails.

  • Page 12: Cowling Installation

    Instruction Manual YAK 55. 7) Slide the throttle pushrod wire into the tube. Position the engine between the mounts. Use four M5x30mm machine screws to secure the engine to the mount as shown. COWLING INSTALLATION. Machine M5x30mm Screw 1) Slide the fiberglass cowl over the...
  • Page 13 www.seagullmodels.com 2) While keeping the back edge of the cowl flush with the marks, align the front of the cowl with the crankshaft of the engine. The front of the cowl should be positioned so the crankshaft is in nearly the middle of the cowl opening.

  • Page 14: Spinner Installation

    Instruction Manual YAK 55. Because the size of servos differ, you may need to adjust the size of the precut opening in the mount. The notch in the sides of the mount allow the servo lead to pass through. 1) Using a small weight (...
  • Page 15 www.seagullmodels.com Secure the servos with the screws provided with your radio system. Plastic tape. Aileron electric. Wing. M3 lock nut. Wing bottom. Servo 1. Aileron. Repeat the procedure for the other aileron pushrod. INSTALLING HORIZONTAL FIN. Repeat the procedure for orther wing. 1) Remove the covering at the rear tail AILERON PUSHROD HORN INSTALLATION root of horizontal fin as picture shown below.

  • Page 16: Installing The Rudder

    Instruction Manual YAK 55. 2)Sand the aluminium tube using sandpaper. This will improve the bond of the Machine screw epoxy to the cardboard horizontal fin. (3x15mm). Coat both sides of one half of the aluminium tube with 30 minute epoxy. Next, pour some epoxy into the cardboard horizontal fin.
  • Page 17 www.seagullmodels.com Rudder control horn. Elevator control horn. 4) Allow the glue to fully cure for at least 6 hours. RUDDER PULL PULL CABLE INSTALLATION. 5) When fully cured, move each control surface throughout is travel range serveral See pictures below: times to break away any epoxy in the hinge.

  • Page 18: Elevator Pushrod Installation

    Instruction Manual YAK 55. 2) Insert servo arm into servo. Elevator pushrod. Control horn. M2 lock nut. Metal clevis. Rudder servo arm. Rudder pushrod. Rudder pushrod. ELEVATOR PUSHROD INSTALLATION. MOUNTING THE TAIL WHEEL. See pictures below. Cut.
  • Page 19 www.seagullmodels.com INSTALLATION PILOT. 1) A scale pilot is included with this ARF. The Seagull Pilot included fitting well to the cockpit. (or you can order others scale pilot figures made by Seagull factory. They are available at Seagull distributors.) If you are going to install a pilot figure, please use a sanding bar to sand the base of the figure so that it is flat.

  • Page 20: Apply The Decals

    Instruction Manual YAK 55. 4) Install the canopy and secure it with M2x6mm ATTACHMENT WING - FUSELAGE. screws. Attach the aluminium tube into fuselage. C/A glue. Wing tube. M2 x 6mm. APPLY THE DECALS. Insert two wing panels as pictures below.

  • Page 21: Control Throws

    www.seagullmodels.com Accurately mark the balance point on the top of the wing on both sides of the fuselage. The balance point is located 130 mm back from the leading edge of the wing at the wing root. This is the balance point at which your model should balance for your first flights.

  • Page 22: Flight Preparation

    Plug in your radio system per the 2) Check every bolt and every glue joint manufacturer's instructions and turn every- in the YAK 55 to ensure that everything is tight thing on. and well bonded. C) Check the elevator first. Pull back on 3) Double check the balance of the air- the elevator stick.

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