3D Hobby Shop 60 inch Yak 55M Assembly Manual

Summary of 60 inch Yak 55M

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    Assembly manual / airframe – 60” yak 55m thank you for purchasing this 3dhobbyshop arf rc aircraft. If you have any issues, questions, concerns or problems during assembly, please contact our tech department at: info@3dhobbyshop.Com or 717-814-5316 10am-4pm eastern monday thru thursday. Safety in as...

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    • always obtain proper insurance before flying. Always fly model aircraft in accordance with the academy of model aeronautics (ama) safety code. Visit the ama's website at www.Modelaircraft.Org for more information. Limits of responsibility 3d hobby shop provides high-quality aircraft and components...

  • Page 3: Let’S Get Started!

    Wrinkles : your airplane was packed in plastic at the factory without any wrinkles in the covering. You may notice some wrinkles now; more likely, you will notice a few in a day or two or the first time you take the plane out to the flying field. These wrinkles are the result of wood shrinkage and/o...

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    Landing gear install the wheels onto the axles and secure with the wheel collars, as shown. Use blue loctite on wheel collar set screws. Slide one wheel/axle assembly into a wheel pant, and install the wheel assembly on the landing gear leg. Tighten the locknut as shown to secure the assembly onto t...

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    Attach the gear to the fuselage with short 3mm screws, use loctite. 5.

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    Install gear cover plate as shown, with clear tape, thick ca or epoxy glue. 6.

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    Fuselage remove covering over horizontal stabilizer slot on both sides of fuselage as shown. Remove covering over elevator servo opening on left side of the fuselage as shown. Remove covering over wing spar tube hole and wing pin holes in fuselage as shown. 7.

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    Remove a square of covering on bottom of fuselage behind wing as shown. This is to allow cooling air to exit fuselage. Now is a good time to go over all joints of the motor box with this ca. 8.

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    Horizontal stabilizer install the horizontal stabilizer in the fuselage, but do not glue at this time. Next, install the wing tube in the fuselage and sight from the back and notice if the horizontal stabilizer and wing tube are parallel to each other. If not, sand or shim the stabilizer opening unt...

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    Measure the distance of leading edge of stabilizer to wing tube. Adjust until even. Be certain all four measurements are even before glueing. When stabilizer is centered and aligned, drip thin ca glue onto the stab-to-fuselage joint top and bottom. Note: we do not remove any covering form the horizo...

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    Install the elevator half with the fiberglass joiner rod onto the stabilizer. Makes sure it flexes easily at least 45 degrees up and 45 degrees down, and has approx 1/32” of gap in the hingeline. Apply thin ca glue to the hinges, 2 large drops on each. Place a piece of removable tape on the elevator...

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    Immediately place a piece of tape on the left elevator counterbalance to the stabilizer. Apply thin ca to the elevator hinges and allow everything to dry. Once the elevator assembly is dry, install the elevator control horn. Be sure to sand the portion 12.

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    Installed in the elevator. Note picture for elevator control horn slot location. Open the slot and install control horn with medium ca. Install elevator servo and pushrod as shown. The ball links are mounted to the elevator control arm and servo arm with 2mm bolts, washers and lock nuts. We are usin...

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    Rudder installation open the slot for the rudder control horn. Use picture for reference in locating the slot. Rough the control horn with sand paper where the glue joint will be, so the ca may adhere better. Install the rudder control horn with medium ca. Center the rudder control horn in the rudde...

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    Install the rudder, take your time to align it, and make sure it swings freely. Apply thin ca to the rudder hinges. Tailwheel assembly before installation, use blue loctite on all set screws. 15.

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    The tiller wire will need to be bent slightly to be inserted in the installed bracket on the bottom of the rudder. Attach the tailwheel assembly to the fuselage with two wood screws as shown. 16.

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    Rudder pull-pull linkage install rudder servo in fuselage as shown. We are using a 2” double servo arm. Install the servo arm as close to perpendicular as possible. Then use your radio's subtrim as needed. The rudder pull-pull cables are assembled as shown in the above diagram. Assemble end of pull-...

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    It is easiest to connect the pull-pull cables to the rudder servo first, then connect to the rudder control arms. Tape the rudder counterbalance with removable tape. Be sure the rudder servo is centered. Install the ball links on the rudder control horns. Assemble the front ends of the pull-pull cab...

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    Power system installation the firewall of the yak is arranged to allow the widest possible selection of motors to fit. Extra space has been provided for long motors and long prop adaptors. For this reason, if your motor is compact, you will need to supply spacers to extend the motor forward as shown...

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    Cowl installation the cowl is mounted onto the fuselage with 4 wood screws. These screws go into the small plywood squares on the front inside of the fuselage. The following procedure is helpful to be sure the wood screws hit the plywood squares. First, make small holes into the plywood squares thro...

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    Use masking tape to hold the cowl in place. Drill pilot holes for the wood screws using the paper markers as a guide. 21.

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    Install the 4 wood screws. Tip: remove screws and cowl, soak holes left in mounting tabs with thin ca. This will strengthen the area. Mount cowl again after ca is completely dry. 22.

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    Wings install the ailerons. Adjust the gap (approximately 1/32”) for maxim throw. Glue the aileron hinges with two large drops of ca per hinge. Open the aileron servo opening and control horn slot. Here we have cut an x in the covering for the aileron servo, no need to remove the covering over the o...

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    Rough the control horn as with the elevator control horn. Glue with medium ca. Install the aileron servo, using the installed strings to guide the servo wire to the wing root. 24.

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    Install aileron servo as shown. Assemble the aileron pushrod using two ball links. We are using a 1” servo arm for the ailerons. Note: the correct size aileron pushrods are included in the bag marked “replacement hardware.” repeat the aileron assembly for other wing. Mount the wings to the fuselage ...

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    Receiver mounting locate the balsa receiver mount marked “rx”. You can mount your receiver to this mount with velcro and use ca glue to mount the balsa to the airframe. Side-force-generators (sfg) sfg's are included with two spacers. The small spacer can be used with the sfg's for conventional place...

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    The sfg's are mounted with 2 wood screws. Locate the precut hole in both spacers and sfg. Note: additional longer wood screws are supplied in hardware bag marked “replacement hardware.” 27.

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    Balancing: balance your yak 55 75mm behind the leading edge of the wing where the wing meets the fuselage for your maiden flight. This is approximately on the forward edge of the carbon wing spar tube. Move the flight battery to balance as necessary. Our preferred cg for 3d aerobatic flight is 85-90...