Goldwing RC 91in CORVUS 50-60CC User manual

GoldWing RC
91in CORVUS 50-60CC
Giant Scale Aerobatic Aircraft

Specifications
Wing Span: 91"(2310mm)
Length: 89-1/2"(2270mm)
Wing Area: 1507sq in(97.2sq dm)
Flying Weight: 17.2-19.5lbs(7800-8800g)
Gas Power:50-70cc gas Recommend DLE55 or DLE61 or GP61
Electric Power：
Hacker Q80-8M with 12S 5000mah 24x10 prop
Or other 4000Watt electric motor
ESC：160A
RADIO:6+CH
Servos: 5-6 high torque servos
Spinner:3.5 inch(89mm) Not included
All contents copyright 2017, GoldWing RC
Dear Customer,
Thank you for purchasing the new Goldwing RC giant scale aerobatic aircraft. This manual covers the 91in
CORVUS 50-60CC aircraft. Goldwing RC proudly presents 91n CORVUS, Extreme Series, which is a premium
product line of electric & gas RC airplanes designed for unlimited 3D performance. The new 91n CORVUS
adopts cutting edge aerodynamic features, such as streamlined canopy, aileron counterbalance, removable
side force generators (SFGs) .The 91in CORVUS is also loaded with new Carbon fibre tail wheel assembly
with CNC machined metal parts, including the aluminium tail wheel hub. And KUZA new 700cc gas Tank
with Alloy cap is included. We hope you will enjoy your new giant scale aircraft as much as we have.
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:
High quality ball link assemblys
Improved stainless steel Axle kit
Including Servo lead safety clips
Includes Side Force Generator’s(SFG)
High performance cap head screws
One piece air foiled carbon fiber landing gear
Two piece removable stabs
Larger diameter carbon fiber wing tube. Carbon fiber tube for stab.
Adjustable pushrods for easy fine tuning(Includes wrench)
Removable rudder

New extra strength Fiberglass control Horns kit
Carbon fiber tail wheel assembly: GW version is CNC machined metal parts
The CORVUS is designed to directly accommodate KUZA® rudder servo tray

Including high quality Velcro Straps
Including KUZA Socket Head Servo Screws
Including KUZA 700cc Gas Tank V2 Version

Including KUZA CNC Aluminum Fuel Dot & Fuel Vent Line Plug
Including rubber grommets

Including Gas engine mount kit
Scheme A White /Yellow/black

Scheme B Red/White /black

Scheme C White/red /black

Items required to complete this Model:
 50-70 cc gas engine with stock or aftermarket
exhaust systems
 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
 Four high quality metal gear servos of 120 in-
oz
or better for the ailerons and elevators
 One high quality rudder servo of 190 in-oz or
better
 Appropriate servo arms for the above
 Heavy duty servo wire extensions.
Recommends three 12”,two to three 48”
extensions. Your installation though may vary.
 Two heavy duty 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
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 commencing assembly:
 Carbon Fiber control Horns : 8 single horns for ailerons and elevator. 2 dual horns for rudder.
Sand the area of the horn that will be glued to help adhesion.

 GW Version is including 3.5” Painted carbon fiber spinner .ARF Version is not included.
 KUZA new 700cc(24oz) larger volume fuel Tank (including Alloy fuel cap)

 Adjustable pushrods kits: Four 3x61mm Pushrods for elevator & aileron. One 3x125mm Pushrod for
rudder（Pull-push style）
 Pull-pull assembly kits for the rudder.
 Ball link assembly : 8 for ailerons and elevators.

 Servo lead safety clips：6 pcs (Bag No. KAG0021)
 3.5in Main wheels：2pcs GW version is Aluminium hub, ARF version is nylon hub
 New stainless steel Axle kits

 Carbon fibre tail wheel assembly:GW version is CNC machined metal parts
 Side force generators (4 x 3x12mm hex bolts & 4 x 3mm stainless steel self-locking nuts & 4 x washers)
 Bolts for landing gear: 4(4x20mm) hexagon bolts and 4(M4) stainless steel self-locking nuts & 4
washers

 Bolts & washers for cowl: 4(3x16mm) Hexagon bolts and 4(10mm) PTFE washers
 Bolts & washers for stab tails: 4(3x12mm) Hexagon bolts and 4(10mm) PTFE washers
 Gas engine mount kit

RUDDER ASSEMBLY
NOTE: There are pictures of different planes in this manual, however, this plane’s wings 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．To fit the rudder to the fin, locate the rudder hinge wire and insert. To make it easier to insert twist as it is
inserted.
4. The CORVUS 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 CORVUS 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. The CORVUS has the closed loop pre-installed and crimped at the rudder end. These can be connected with
the M3 bolts and nut. The wire will be left looped inside the fuselage and will need to be connected to the
servo arm.

8. 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.
9. 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．The CORVUS also provides pull-push style for rudder. Below is picture of pull-push style linkage set.
12. Cut off excess carbon fiber rudder horn, and use sandpaper to rough the parts needed to inlay, and use
epoxy glue to glue the horn in place.