Goldwing RC YAK55M 30CC User manual

GOLDWING RC
YAK55M 30CC
Giant Scale Aerobatic Aircraft

Specifications
Wing Span: 73"(1860mm)
Length: 68"(1730mm)
Wing Area: 1023sq in(66sq dm)
Flying Weight: 9.7-11lbs(4400-5000g)
Glow: .91-1.20（2C） 1.10-1.40（4C）
Gas： 26CC-38CC Gas DLE30 DLE35
Electric Power：1900-2200Watt electric motor
ESC： 80-100A
Radio: 4+ Channels
Servos: 4-6 servos required 160 oz to 330 oz (10-20kg/cm)
All contents copyright 2016, GoldWing RC
Version 1.0, Jan 2016
Dear Customer,
Thank you for purchasing the new Goldwing RC giant scale aerobatic aircraft. This manual covers the
YAK55M 30CC aircraft. The new version YAK55M 30CC adopts cutting edge aerodynamic features, such as
streamlined canopy, aileron counterbalance, removable side force generators (SFGs) .The YAK55M is also
loaded with high-end accessories including genuine Oracover, CF landing gear, tail wheel assembly and control
horns. And KUZA new fuel Tank with aiioy cap is included.
A QUICK WORD ABOUT SAFETY AND RADIO CONTROL FLYING MODELS
With radio control aircraft, like any hobby or sport, there are certain risks. The operator of these models is
responsible for these risks. If misused or abused, you may cause serious bodily injury and/or damage to
property. With this in mind, you will want to be certain that you build your model carefully and correctly. If
you are not an experienced flier, have your work checked and ask for help in learning to fly safely. This model
aircraft is not a toy and must be operated and flown in a safe manner at all times. Always perform a pre-flight
check of the model including all control surfaces, correct function of the radio gear, structure, radio range, and
any other area relating to the safe operation of this aircraft.
Models are not insurable but operators are. You can obtain coverage through membership in the Academy of
Model Aeronautics (AMA). For an AMA information package call 1-800-435-9262, ext. 292 or visit the AMA
website at "www.modelaircraft.org". Or if you are in any other country please contact the appropriate body.
By the act of using the final assembled model, the purchaser/operator accepts all resulting
liability.

Goldwing RC WARRANTY AND RETURN POLICY
GoldWing RC guarantees this product to be free from defects in both material and workmanship at the date of
purchase. This does not cover any parts damaged by use, misuse or modification. In no case shall liability
exceed the original cost of this kit. Because Goldwing RC has no control over the final assembly or
equipment/components used in the final assembly, no liability shall be assumed for any damage resulting
from the use of this model by the user. By the act of using the final assembled model, the user accepts all
resulting liability. If you should find any missing or damaged parts, or have any questions about this product,
please contact within 30 days of the purchase in order to be covered by our warranty. You may contact us at
[e-mail].
Included Features:
 Improved stainless steel axles
 Flat nylon hinges for better flying strength
 Pre-hinged control surfaces
 Larger aileron and elevator design. Up to 60 degrees of throw on all control surfaces for excellent 3D
aerobatic flying
 Extra covering provided for small repairs and covered in genuine Ultracote / Oracover
 Aluminium hub rubber wheels
 KUZA RTF Fuel Tank with alloy tank cap

 Side force generators
 Canopy hatch pins are made of nylon rods for better resistance aganist vibration
Carbon Fiber accessories version：
 Extra strength carbon fiber control horns

 One piece air foiled carbon fiber landing gear
 Carbon fiber tail wheel assembly with CNC machined metal parts, including the aluminium tail wheel
hub.
 Increased diameter carbon fiber wing tube over previous versions
Scheme D White/red/blue

Scheme E Yellow/black /red

Items required to complete this model:
 26-38 cc gas engine with stock or aftermarket
exhaust system
 Appropriate propeller for your engine
 All the required engine and exhaust mounting
hardware
 Ignition battery and switch
 One quality throttle servo and appropriate
servo arm
 3 high quality metal gear servos of 80 in-oz or
better for the ailerons and elevators
 One high quality rudder servo of 160 in-oz or
better
 Appropriate servo arms for the above
 Servo wire extensions. Recommend KUZA
Twisted 22 AWG Servo Extensions (Not
included)
One 12”(305mm) No. KAG002522
Three to four 18”(455mm) No. KAG002523
 Switches with charging jacks for the Rx
 Rx batteries of significant capacity to power
your choice of servos.
 Receiver of your choice
Required tools
 Covering Iron and heat gun
 Assortment normal hobby tools such as
screwdrivers, hobby knife, drill and drill bits,
pliers, etc.
 Thick and thin CA adhesives
 30 minute epoxy
 Isopropyl alcohol
 Ruler or tape measure
 Blue thread-lock or equivalent

Note: As with all kits, it’s a good idea to read all the instructions and study the parts before you begin
construction. Handle the parts of this kit with care so you do not damage any of the structure or covering.
Inspect all the parts for any shipping damage and report any issues to as soon as you can. Make sure you
have a flat and sturdy workbench and follow all safety advice for the tools and adhesives you plan to use.
AIRCRAFT COVERING
1. With all ARFs, varying temperatures and storage delays can cause covering material to loosen over time
and transportation. We recommend lightly going over all the covering with a covering iron set at medium
temperatures. Be sure to use a soft cover over your iron so you do not scratch the covering surface. Be
sure you go over all seams and edges of the covering to assure it is secure to the airframe and other
covering. Be careful not to apply too much heat or you may cause bubbles or damage to the covering. A
heat gun may also be used along with a soft cotton cloth to shrink and adhere the covering. Again, be
extremely careful when using a heat gun.
2. Be sure to seal any exposed wood with a thin coating of epoxy to prevent engine oil from soaking in. This
is especially important around the engine compartment and servo openings with exposed areas.
3. Some modelers prefer to seal the hinge gaps using strips of appropriate covering or clear trim tape. We
have found this to be helpful with models intended for higher speed flight or models with unusually large
hinge gaps. Our aircraft utilize a very tight double beveled hinge line and do not normally require this step.
Sealing the hinge gaps is therefore left as an option for the modeler.
Please verify the accessories before assemble:
 Carbon Fiber control Horns (Bag No. KA03CA4) : 8 single horns for ailerons and elevator and rudder.

Sand the area of the horn that will be glued to help adhesion.
 KUZA new 360cc fuel Tank with alloy cap
 Push rod kits: Two 2.5x60mm Pushrods for aileron. Two 2.5x110mm Pushrods for elevator.
 Ball link assembly (Bag No. KAG00122): 8 for ailerons & elevator & rudder.

 Alu long arm kits: 4 single arms for ailerons and elevator and rudder.
 Servo lead safety clips：5 pcs (Bag No. KAG0021)
 Alu Main wheels：2pcs（Bag No. KAG0157）

 New axle kits (Bag No. KA03CH)
 Carbon fibre tail wheel assembly with CNC machined metal parts, including the aluminium tail wheel
hub. (Bag No. KAGC103)
 Extra covering provided for small repairs

 4 allen key wrench (Bag No. KA03CE)
 Side force generators (2 x 3x12mm hex bolts & 2 x 3mm stainless steel self-locking nuts & 2 x washers )
 Screews for landing gear: 4(4x20mm) hexagon bolts and 4 washers

 Bolts & washers for cowl: 4(3x14mm) Hexagon bolts and 2(10mm) PTFE washers and 2 wsahers
 Gas engine washers for 30CC version: 12(20mm) POM washers
RUDDER ASSEMBLY
NOTE: There are pictures of different planes in this manual, however, this plane’s rudder is assembled
the same way.
1．It is much easier to install the twin control horns before installing the rudder. Locate the carbon fiber
rudder control horns, ball links, and associated bolts and nylon-insert lock nuts. Use some fine sandpaper

to roughen up the center areas of the two control horns so that the glue adheres better. Using a sharp
hobby knife or soldering iron remove the covering away from the slots in the rudder and trial fit the two
control horns.
2. Mix up some 30 minute epoxy and coat the inside of the slots and the center of the control horns. Hint: a
scrap piece of 1/16” ply, tooth pick, or old hobby blade can be used to coat the inside of the rudder slots.
Slide the control horns in place and make sure they are centered perfectly by using a ruler to measure
between the pivot holes and the hinge line. Wipe any excess glue off with isopropyl alcohol and paper
towels. Install the ball links, bolts and nuts into the holes to help assure alignment of both control horns
while the glue cures. Set aside until cured. NOTE: There are pictures of different planes in this manual;
however, this plane’s rudder is assembled the same way.
3． Apply 30 minute epoxy to hinges, then insert them into the hinge slots on the rudder, secure the rudder
with masking tapes, then allow the epoxy to dry.

4. The YAK can use either closed loop or a rear push pull servo for the rudder. We recommend that you
balance the model assembled before choosing your servo placement.
5. The YAK is supplied with a high quality set of pull-pull cables and ball-links.
6. Install your rudder servo into the precut locations in the fuselage. Using a fine drill pre-drill the holes and
drop thin CA into the holes to strengthen the wood. You will need 3 inch arms on the servo. Set up your radio
accordingly and center the rudder servo.
7．Aluminum dual servo arm are include in the kit, enlarge the control holes with 2.5mm drill bit.
8. The YAK has the closed loop pre-installed and crimped at the rudder end. These can be connected with the
M2.5 bolts and nut. The wire will be left looped inside the fuselage and will need to be connected to the servo
arm.

9. Use your radio system to center the rudder servo and attach either the supplied arm or an appropriate arm
for your servo. Thread one of the ball links about half way onto one of the threaded couplers. Feed the loose
end of one of the cables through a brass tube and then through the threaded coupler. Holding the rudder
centered, adjust the cable length as tight as possible while checking the ball link position over the servo arm.
When satisfied with the position, pinch the cable around the threaded coupler and then feed the loose end
back through the brass tube. Loop the cable back through the brass tube as before and crimp the brass tube
three times just tight enough not to cut the brass tube but enough to securely hold the wire in place. Cut off
the excess cable with wire cutters. Wick thin CA into the brass tube to help hold the cable secure. Repeat for
the other cable. Hint: Once you have established the position of the threaded coupler on the cable, you can
remove the ball link from the rudder horn to give you more working slack in the fuselage. Re-install the ball
link prior to setting the other cable.

10. Check the operation of the rudder using your radio and make sure there is no binding and the cables are
adjusted properly. You may have to tighten the cables after a few flights as they may stretch slightly from the
initial installation.
11．We recommend using KUZA 3.25” aluminium CNC servo arm (sold separately) for rudder control.
LANDING GEAR ASSEMBLY
NOTE: There are pictures of different planes in this manual, however, this plane’s landing gear is assembled
the same way.
1. Locate the supplied main and tail wheel landing gear parts and sort them out on your workbench.
2. Bolt the main gear to the bottom of the fuselage using the supplied screws and stainless steel Self-locking
nuts. Place the bolts in through the can tunnel opening with appropriate size spanner. Remember the
gear will rake forward.

3.Loosen out the inner nut, then apply thread lock to the axle. Tighten the nut back in place, allow the thread
locker to dry.
4. Install the main wheel axles to the composite landing gear and tighten the nylon-insert lock nut. Install one
wheel collar onto the axle. Use a second wheel collar as a guide to leave a gap on the inboard of the axle. Use
a small drop of thread-lock and tighten in place. Slide the wheel onto the axle and install a second wheel
collar also using thread-lock on the set screw.

5. Fit the wheel pant in place and install using the two supplied screws. Use thread-lock to secure the screws in
place. Repeat the above steps for the other main gear.

6. The tail wheel installation is very simple, the factory has installed most of the accessories, see the below
picture.
7. Line up the caron fiber assembly onto the body of the aircrtaft and use the holes as a drill guide. Use a
2mm drill bit as a pilot hole, then apply thin CA to harden the wood. Use the three self tapping screws and
secure the assembly into place.