Seagull Models YAKOVLEV YAK 3 ARF Assembly Manual
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Seagull Models YAKOVLEV YAK 3 ARF Assembly Manual

63 inch
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YAKOVLEV YAK 3
" Graphics and specifications may change without notice ".
A S S E M B L Y M A N U A L
- 63 inch
Specifications:
Wingspan---------------63.0 in (160 cm).
Wing area---------------723.9 sq.in ( 46.7sq.dm).
Weight-------------------11.5 lbs ( 5.2 kg).
Length-------------------55.4 in (140.6 cm).
Engine-------------------20cc
Radio--------------------7 channels with 9 servos.
Code: SEA270
1

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Summary of Contents for Seagull Models YAKOVLEV YAK 3 ARF

  • Page 1 A S S E M B L Y M A N U A L YAKOVLEV YAK 3 - 63 inch “ Graphics and specifications may change without notice ”. Code: SEA270 Specifications: Wingspan---------------63.0 in (160 cm). Wing area---------------723.9 sq.in ( 46.7sq.dm). Weight-------------------11.5 lbs ( 5.2 kg).

  • Page 2: Kit Contents

    YAK 3 Instruction Manual. INTRODUCTION. Thank you for choosing the YAK 3 ARF by SG MODELS. The YAK 3 was designed with the intermediate/advanced sport flyer 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 ARF, yet the design allows the aeroplane to be kept light.

  • Page 3: Additional Items Required

    HINGING THE FLAP. KIT CONTENTS. SEA270 YAK 3 1. Fuselage 2. Wing set 3. Tail set 2x10mm 4. Canopy 5. Cowling 6. Pilot ADDITIONAL ITEMS REQUIRED. 20cc gasoline engine. � Computer radio with 9 servos. � Glow plug to suit engine. �...

  • Page 4: Hinging The Aileron

    YAK 3 Instruction Manual. 4) Deflect the aileron and completely satu- HINGING THE AILERON. rate each hinge with thin C/A glue. The ailer- ons front surface should lightly contact the Note : The control surfaces, including the ai- wing during this procedure. Ideally, when lerons, elevators, and rudder, are prehinged the hinges are glued in place, a 1/64”...

  • Page 5: Install The Ailerons

    8) After both ailerons are securely hinged, firmly grasp the wing panel and aileron to make sure the hinges are securely glued and cannot be pulled out. Do this by carefully ap- plying medium pressure, trying to separate the aileron from the wing panel. Use caution not to crush the wing structure.

  • Page 6: Installing The Aileron Servos

    YAK 3 Instruction Manual. WING ASSEMBLY. Please see below pictures. INSTALLING THE AILERON SERVOS. Attach the aluminum tube into wing. 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.
  • Page 7 7) Apply 1-2 drops of thin C/A to each of the mounting tabs. Allow the C/A to cure without using accelerator. 3) Use drill bit in a pin vise to drill the mouting holes in the blocks. C/A glue 8) Remove the string from the wing at 4) Apply 2-3 drops of thin C/A to each the servo location and use the tape to at- of the mounting holes.

  • Page 8: Aileron Pushrod Installation

    YAK 3 Instruction Manual. INSTALLING THE FLAP SERVO. Repeat the procedure for the flap servo. AILERON PUSHROD INSTALLATION. Please see below pictures. 9) Set the aileron hatch in place and use a Phillips screw driver to install it with four wood screws.

  • Page 9: Light Cover

    LIGHT COVER. Bend at the mark M2 lock nut. Metal clevis. Snap keeper. Servo arm. Snap keeper. Nylon Snap keeper. Hex Nut. Fuel tubing. INSTALLING THE FLAP PUSHROD. STANDARD FIXED LANDING GEAR. Repeat the procedure for the aileron pushrod. 1) Locate the items necessary to install retractable landing gear as shown.
  • Page 10 YAK 3 Instruction Manual. Mark. Drill. 3.5x20 mm 2) Install servo for Retractable landing gear. 38mm M3 lock nut. M3 clevis.

  • Page 11: Optional Retractable Landing Gear

    4) Secure the landing gear doors to the landing gear struts. M3x10 mm 3) Slide the wheel on the axle, then se- M3x8 mm cure it using the wheel collar. Collar. OPTIONAL RETRACTABLE LANDING GEAR. Electric retractable landing gear is not included in this kit, however it is a very popular add-on as optional.
  • Page 12 YAK 3 Instruction Manual. Drill.

  • Page 13: Installing The Fuselage Servos

    Secure the landing gear doors to the landing gear struts. M3x10 mm INSTALLING THE FUSELAGE SERVOS. 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.
  • Page 14 YAK 3 Instruction Manual. THROTTLE SERVO ARM INSTALLATION. Install adjustable servo connector in the servo arm as same as picture below: Loctite secure. Adjustable servo Switch. connector. INSTALLING THE ENGINE SWITCH. Servo arm. Throttle servo arm. Trim and cut. INSTALLING THE RECEIVER SWITCH. Install the switch into the precut hole in the side, in the fuselage.

  • Page 15: Fuel Tank Installation

    5) With the stopper assembly in place, the weighted pick-up should rest away from the rear of the tank and move freely inside the tank. The top of the vent tube should rest just below the top of the tank. It should not touch the top of the tank.

  • Page 16: Engine Mount Installation

    YAK 3 Instruction Manual. Blow through one of the lines to ensure the fuel lines have not become kinked inside the fuel tank compartment. Air should flow through easily. Balsa wood. ENGINE MOUNT INSTALLATION. 1) Locate the items necessary to install the engine mount included with your C/A glue.
  • Page 17 Machine screw M4x30mm 145mm 4) On the fire wall has the location for the 2) Use a pin drill and 4mm drill bit to throttle pusshrod tube (pre-drill). drill a small indentation in the mount for the engine mounting screw. 5) Slide the pushrod tube in the firewall and guide it through the fuel tank mount.
  • Page 18 YAK 3 Instruction Manual. COWLING. Please see below pictures. HINH XUA 8) Reinstall the servo horn by sliding the connector over the pushrod wire. Cent- er the throttle stick and trim and install the servo horn perpendiular to the servo center line.
  • Page 19 Because of the size of the cowl, it may be nec- essary to use a needle valve extension for the high speed needle valve. Make this out of suf- ficient length 1.5mm wire and install it into the end of the needle valve. Secure the wire in place by tightening the set screw in the side of the needle valve.
  • Page 20 YAK 3 Instruction Manual. - Motor: 110 -2000 Watt 4 mm - Propeller: 17x 8 ~ 19x10 - ESC: 85A - Lipo Batteries: 8S - 9S 3) Attach the electric motor box to the firewall suitable with the cross lines drawn on the electric motor box and fire- wall.

  • Page 21: Installing The Spinner

    Epoxy Battery. 145mm INSTALLING THE SPINNER. Balsa stick. Epoxy 6) Attach the speed control to the side of the motor box using two-sided tape and tie wraps. Connect the appropriate leads from the speed control to the mo- The propeller should not touch any tor.

  • Page 22: Hinging The Elevator

    YAK 3 Instruction Manual. INSTALLING THE HORIZONTAL HINGING THE ELEVATOR. STABILIZER. Glue the elevator hinges in place using 1) Using a ruler and a pen, locate the cen- the same techniques used to hinge the ai- terline of the horizontal stabilizer, at the lerons.

  • Page 23: Hinging The Rudder

    4) With the stabilizer held firmly in place, 7) When you are sure that everything is use a pen and draw lines onto the stabi- aligned correctly, mix up a generous lizer where it and the fuselage sides meet. amount of 30 Minute Epoxy. Apply a thin Do this on both the right and left sides layer to the top and bottom of the stabi- and top and bottom of the stabilizer.
  • Page 24 YAK 3 Instruction Manual. INSTALLING VERTICAL STABILIZER INSTALL RUDDER CONTROL HORN. 1) Using a modeling knife, remove the Repeat steps to install the rudder con- covering from over the precut hinge slot trol horn as same as steps done for ailer- cut into the lower rear portion of the fu- selage.

  • Page 25: Elevator Pushrod Installation

    5) When you are sure that everything is aligned correctly, mix up a generous amount of Flash 30 Minute Epoxy. Ap- ply a thin layer to the mounting slot and to bottom of the vertical stabilizer mounting area. Apply epoxy to the bot- Hinge slot.

  • Page 26: Rudder Pushrod Installation

    YAK 3 Instruction Manual. 3) Thread one clevis and M2 lock nut on to each elevator control rod. Thread the horns on until they are flush with the ends of the control rods. 4) Elevator and rudder pushrods assem- bly as pictures below. Elevator pushrod.

  • Page 27: Mounting The Tail Wheel

    MOUNTING THE TAIL WHEEL. Pen.
  • Page 28 YAK 3 Instruction Manual.
  • Page 29 PLASTIC PARTS WITH PANEL INSTRUCTIONS.
  • Page 30 YAK 3 Instruction Manual. INSTALLATION PILOT AND CANOPY. 1) Locate items necessary to install pilot, seats.

  • Page 31: Apply The Decals

    4) Position the canopy onto the fuselage. Trace around the canopy and onto the fu- selage using a felt-tipped pen. Carefully cut and remove covering material from the fuselage where the canopy makes contact, exposing the bare wood. Then permanently glue the canopy in place with epoxy glue or special “canopy glue”.
  • Page 32 YAK 3 Instruction Manual. Battery. Wing bolt. Receiver. Battery. ATTACHMENT WING- FUSELAGE. Then, install wing guns on the wings.
  • Page 33 Accurately mark the balance point on the top of the wing on both sides of the fuselage. The balance point is located 160mm back from the leading edge of the wing at the wing root. This is the bal- Epoxy ance point at which your model should balance for your first flights.

  • Page 34: Control Throws

    YAK 3 Instruction Manual. CONTROL THROWS. Ailerons: 160mm High Rate : 15mm Low Rate 12mm Elevator: High Rate : 15mm Low Rate 12 mm Rudder: High Rate : 25mm Low Rate 20 mm...

  • Page 35: Flight Preparation

    FLIGHT PREPARATION. PREFLIGHT CHECK. Check the operation and direction 1) Completely charge your trans- of the elevator, rudder, ailerons and mitter and receiver batteries before throttle. your first day of flying. A) Plug in your radio system per the 2) Check every bolt and every glue manufacturer’s instructions and turn joint in the YAK 3 to ensure that eve- everything on.
  • Page 36 YAK 3 Instruction Manual. If you have any queries, or are interested in our products, please feel free to contact us Factory : 12/101A - Hamlet 4 - Le Van Khuong Street - Dong Thanh Ward - Hoc Mon District - Ho Chi Minh City - Viet Nam. Office : 62/8 Ngo Tat To Street - Ward 19 - Binh Thanh District - Ho Chi Minh City - Viet Nam Phone : 848 - 37114542 or 848- 36018777...

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