Goldwing RC 91in EXTRA300LP50-60CC User manual

ARF MODEL
91in EXTRA300LP 50-60CC
Instruction Manual

Dear Customer,
Thanks for purchasing this newly designed 91in EXTRA300 50-60CC aerobatic RC airplane. The weight is
approximately 17.5Lbs. It’s good for IMAC and free style flying. It’s a beautiful plane with amazing flight
performance. It’s covered with genuine monocote, and comes with good quality accessories, including
carbon fiber wing tube, Anodized 6061 aluminum landing gear or carbon fiber as an option. We hope you
enjoy this plane.
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, proper
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".
By the act of using the final assembled model, the purchaser/operator accepts
all resulting liability.
ARF MODELS WARRANTY AND RETURN POLICY
We guarantee that the plane is in perfect condition at purchase. The warranty will be voided after
modifications and usages. If you have any questions or find any issues, please contact the distributors in
your area.
SPECIFICATIONS
WING SPAN:91"(2310mm)
LENGTH: 88-1/4"(2240mm)
WING AREA:1494sq in(96.4sq dm)
FLYING WEIGHT:16.5-18lbs(7500-8200g)
GAS:50CC-70CC Gas DLE55 DLE61 DA50 DA60 GP61
Electric Power：
Hacker Q80-8M with 12S 5000mah 24x10 prop
Or other 4000Watt electric motor
ESC:160A

RADIO:6+CH/5-6S
FEATURES INCLUDED
Newly designed structure
Two pieces removable wings & stabs
Larger aileron and elevator design for excellent 3D aerobatic flying
Full length Tuned pipe tunnel designed into fuselage
Servo extension safety connector clips
High performance cap head bolts
Flat nylon hinges for increased strength
High quality 3mm ball links assembly
Carbon fiber wing tube
Carbon fiber stab tube
Removable rudder
Includes Side Force Generator’s(SFG)
CNC anodized aluminum Canopy Bolts

Adjustable pushrods for easy fine tuning(Includes wrench)
New dual fiberglass horn assembly

Carbon fiber tail wheel assembly
High-quality durable rubber wheels
Stainless steel Axles
Two options for landing gear: Anodized 6061 Aluminum or Carbon fiber
Carbon fiber landing gear Anodized 6061 Aluminum landing gear

X basla batten structure ensures high strength of fuselage
Canopy hatch pins are made of nylon rods for better resistance aganist vibration
The EXTRA is designed to directly accommodate KUZA® rudder servo tray.
New KUZA Gas Tank with alloy tank cap

Scheme A : Silvery/red/ black

Scheme B : White/ blue/black
Scheme C : White /red/blue

Items Required to Complete This Model:
50-70CC Gas engine and exhaust
Appropriate propeller for your Motor
All required engine and exhaust mounting
hardware
Ignition battery and switch
One quality throttle servo and appropriate
servo arm
4Pcs high quality metal gear servos or better
for the ailerons and elevators
Appropriate servo arms for the above
Servo wire extensions. Recommends two 48”,
One 18”, two 12” extensions
Two switches with charging jacks for the Rx
Two high quality Rx batteries of significant
capacity to power your choice of servos.
One Receiver of your choice
Shop Supplies/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. recommends 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. 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 locate the accessories before assembly:
New Expoxy horn kits (Bag No. KA05CA): 8 single horns for ailerons and elevators. 2 dual horns for
rudder.

There is a layer of protection film on the horns. Please remove the film as shown following picture.
Make sure to sand the horns so the surface is rough to glue correctly.
Pushrods(Bag No. KA05CBG2) Four 3x61mm pushrods for ailerons. One 3x125mm pushrods rudder
（Pull-push style）

Pull-pull assembly kits for the rudder. (Bag No. KA05CD)
Ball link assemblies (Bag No. KAG00131): 8 for ailerons and elevators.
Alu long arm kits (Bag No. KA05CC): 4 single arms for ailerons and elevators. 1 dual arm for the rudder.
6 Servo extension safety connector clips (Bag No. KAG0021)

Main rubber wheels (Bag No. KAG014B)：2PCS
New stainless steel Axle kits (Bag No. KA05CH): 2PCS
New Carbon fiber tail wheel assembly. (Bag No. KAG0104)

4mm ALU canopy bolts & 12mm PTFE washers (Bag No.KAG0043)
Side force generators (mounted with four M3X18 hand bolts and 2 balsa sheets)
Bolts for landing gear: 4(4x20mm) hex bolts and 4(M4) stainless steel self-locking nuts & 4 washers
Bolts & washers for cowl: 4(3x16mm) Hexagon bolts and 2(10mm) PTFE washers and 2 wsahers

4 allen keys(Bag No. KA05CE)
Bolts & washers for stab tails: 4(3x12mm) Hexagon bolts and 4(10mm) PTFE washers
Washers for gas engine: 12(20mm) POM washers
Wing Assembly
1.Aileron push rod linkage set. 3x61mm Pushrods for aileron.

2.It is much easier to install the twin control horns before installing the wing. Locate the fiberglass aileron
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 cut the covering away from the slots in the rudder and trial fit the two control horns.
3. 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 aileron 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.
4. The slots for the supplied hinges are pre cut. Locate the hinges and dry fit the hinges and aileron into
place and test the operation. The hinges should seat fully into the slots so that the hinge line gap is minimal
while still allowing full aileron deflection.
5. Before gluing the hinges in you must first clean the hinges of any mold release agent using isopropyl
alcohol. We also recommend scuffing up the plastic with light sandpaper for maximum glue adhesion.
6. Mix up some 30 minute epoxy and using a toothpick or small wooden dowel coat the inside of each
hinge slot with epoxy. Also put a thin layer of epoxy on one side of the hinges. Install this end into the
slots of the rudder and make sure each hinge is properly aligned at exactly 90 degrees to the hinge line.
7. Now coat the other end of the hinges with epoxy and install the aileron into the trailing edge of the wing.
Again, make sure the hinges remain in proper alignment. Using paper towels and some isopropyl alcohol
clean off any excess epoxy from the hinges and surrounding areas.
8. Make sure the aileron is fully seated so that the hinge gap is minimal while still allowing full deflection of
the aileron. When satisfied, use some masking tape to hold the aileron in place along the bottom and
counterbalance. After the epoxy has cured, remove the masking tape and check for proper operation. If
the hinges are stiff some light oil carefully placed on each hinge will help greatly.

9. Cut the covering from the aileron servo openings from corner to corner and iron down inside the openings.
Connect servo wire extensions to your servos and secure the connections with the supplied clips, your own
clips, or tape. Feed the servo wires into the wing and out the root. Install the servos and screw firmly in
place.
10. Use your radio to set the centers of each servo and then assemble and adjust the length of each control
rod. The servo arm should be as close to perpendicular to the control rod as possible while the aileron is at
neutral. Double check all screws, bolts and nuts to assure proper installation and operation without
binding.Once satisfied, permanently attach the ball link to the servo arm with the supplied screw and nut.
11. Check the final radio operation of the ailerons and make sure there is no binding or servo fighting of
each other. Also check to make sure all linkage bolts and nuts are secure.
12. We recommend using KUZA 1.75” aluminium CNC servo arm (sold separately) for wing control.

Elevator Assembly
1. Push rod linkage set for elevator. 3x61mm Pushrods for elevator.
2. Find the slots for the control arms in the elevators and remove the covering where the horns are
inserted and the area for the plate.
3. Sand the area on the horn that will be glued inside the elevator.

4. Using plenty of 30 minute epoxy fit the horn and plate into place. Use a ball joint and bolt to hold
the horn in place while drying.
REPEAT FOR THE OTHER SIDE
5. Place long arms onto the servo’s you are planning to use for the elevators.
6. Place the servo into the elevator and screw in place. Remember to harden the holes with thin Cyano.

7. Place the servo arm back onto the servo, remembering to centre.
Use nutlock on the servo arm screw.
8. Fit the pushrod in place remembering one end is reverse threaded. Set it so the arm is centered and
the elevator is flat. Choose the holes depending on how much deflection you require.