Great Planes GPMA1470 User Manual

WARRANTY

Great Planes

®

Model Manufacturing Co. guarantees this kit to be free from defects in both material and workmanship at the date of
purchase.This warranty does not cover any component parts damaged by use or modification. In no case shall Great Planes’ liability
exceed the original cost of the purchased kit. Further, Great Planes reserves the right to change or modify this warranty without notice.

In that Great Planes has no control over the final assembly or material used for final assembly, no liability shall be assumed nor
accepted for any damage resulting from the use by the user of the final user-assemb led product.By the act of using the user-assembled
product, the user accepts all resulting liability.

If the buyer is not prepared to accept the liability associated with the use of this product, the buyer is advised to return this
kit immediately in new and unused condition to the place of purchase.

To make a warranty claim send the defective part or item to Hobby Services at the address below:

Hobby Services

3002 N. Apollo Dr. Suite 1

Champaign IL 61822 USA

Include a letter stating your name, return shipping address, as much contact information as possible (daytime telephone number, fax
number, e-mail address), a detailed description of the problem and a photocopy of the purchase receipt. Upon receipt of the package
the problem will be evaluated as quickly as possible.

READ THROUGH THIS MANUAL BEFORE STARTING
CONSTRUCTION. IT CONTAINS IMPORTANT WARNINGS
AND INSTRUCTIONS CONCERNING THE ASSEMBLY
AND USE OF THIS MODEL.

GPMZ0286 for GPMA1470 V1.0© Copyright 2005

Champaign, Illinois

[phone], Ext 5

[e-mail]

INSTRUCTION MANUAL

Wingspan: 43.25 in [1110mm]
Wing Area: 340 sq in [21.9 dm2]
Weight: 2.5-3 lb [1130-1360 g]
Wing Loading: 17-20 oz/sq ft [52-61 g/dm2]
Length: 34 in [865mm]
Radio: 3-channel
Engine: .15-.25 cu in [2.5-4cc] two-stroke,

.30 cu in [5cc] four-stroke

INTRODUCTION................................................................2

AMA ...................................................................................2

SAFETY PRECAUTIONS..................................................2

ADDITIONAL ITEMS REQUIRED .....................................3

Hardware and Accessories..........................................3

Adhesives and Building Supplies.................................3

Optional Supplies and Tools ........................................3

IMPORTANT BUILDING NOTES.......................................4

COMMON ABBREVIATIONS ............................................4

ORDERING REPLACEMENT PARTS...............................4

KIT CONTENTS.................................................................5

PREPARATIONS................................................................6

ASSEMBLE THE WING.....................................................6

Install the Ailerons........................................................6

Install the Aileron Servos and Pushrods......................6

Join the Wing...............................................................7

Mount the Wing to the Fuselage..................................8

ASSEMBLE THE FUSELAGE...........................................9

Install the Stab and Fin................................................9

Install the Elevator Servo and Pushrod .....................11

Install the Fuel Tank, Engine, Throttle Servo

and Pushrod....................................................11

Mount the Cowl..........................................................13

Install the Canopy and Tail Cone ...............................14

Install the Radio.........................................................14

Apply the Decals........................................................14

GET THE MODEL READY TO FLY..................................15

Check the Control Directions.....................................15

Set the Control Throws..............................................15

Balance the Model (C.G.) ..........................................15

Balance the Model Laterally.......................................16

PREFLIGHT .....................................................................16

Identify Your Model.....................................................16

Charge the Batteries..................................................16

Balance Propellers.....................................................16

Ground Check............................................................16

Range Check .............................................................17

ENGINE SAFETY PRECAUTIONS .................................17

AMA SAFETY CODE.......................................................17

CHECK LIST....................................................................18

FLYING.............................................................................18

Fuel Mixture Adjustments ..........................................18

Hand Launching.........................................................19

Flight ..........................................................................19

Landing ......................................................................19

The Great Planes

®

1/12 scale Combat Corsair ARF is a
great-flying model suitable for sport flying or AMA Combat
Class #2610. Whether you are a competitor or just want a
great-looking and great-flying Corsair, this 1/12 scale
Combat Corsair ARF will become a favorite.

For the latest technical updates or manual corrections to the
Combat Corsair visit the Great Planes web site at
www

.greatplanes.com. Open the “Airplanes” link, then
select the 1/12 scale Combat Corsair ARF. If there is new
technical information or changes to this model a “tech
notice” box will appear in the upper left corner of the page.

We urge you to join the AMA (Academy of Model Aeronautics)
and a local R/C club.The AMA is the governing body of model
aviation and membership is required to fly at AMA clubs.
Though joining the AMA provides many benefits, one of the
primary reasons to join is liability protection. Coverage is not
limited to flying at contests or on the club field. It even applies
to flying at public demonstrations and air shows. Failure to
comply with the Safety Code (excerpts printed in the back of
the manual) may endanger insurance coverage. Additionally,
training programs and instructors are available at AMA club
sites to help you get started the right way. There are over
2,500 AMA chartered clubs across the countr y. Contact the
AMA at the address or toll-free phone number below:

Academy of Model Aeronautics

5151 East Memorial Drive

Muncie, IN 47302-9252

Tele. [phone]

Fax [phone]

Or via the Internet at:

http://www.modelaircraft.org

IMPORTANT!!! T w o of the most important things you can do
to preserve the radio controlled aircraft hobby are to avoid
flying near full-scale aircraft and avoid flying near or over
groups of people.

1.Your Combat Corsair should not be considered a toy, but
rather a sophisticated, working model that functions very
much like a full-size airplane. Because of its performance
capabilities, the Combat Corsair, if not assembled and
operated correctly, could possibly cause injury to yourself or
spectators and damage to property.

PRO TECT YOUR MODEL,YOURSELF

& OTHERS...FOLLOW THESE

IMPORTANT SAFETY PRECAUTIONS

AMA

INTRODUCTIONTABLE OF CONTENTS

2

2.You must assemble the model according to the instructions.
Do not alter or modify the model, as doing so may result in an
unsafe or unflyable model. In a few cases the instructions may
differ slightly from the photos. In those instances the written
instructions should be considered as correct.

3.You must take time to build straight, true and strong.

4. You must use an R/C radio system that is in first-class
condition and a correctly sized engine and components (fuel
tank, wheels, etc.) throughout the building process.

5.You must correctly install all R/C and other components so
that the model operates correctly on the ground and in the air .

6.You must check the operation of the model before every
flight to insure that all equipment is operating and that the
model has remained structurally sound. Be sure to check
clevises or other connectors often and replace them if they
show any signs of wear or fatigue.

7. If you are not an experienced pilot or have not flown this
type of model before, we recommend that you get the
assistance of an experienced pilot in your R/C club for your
first flights.If you’re not a member of a club, your local hobb y
shop has information about clubs in your area whose
membership includes experienced pilots.

8.While this kit has been flight tested to exceed normal use,
if the plane will be used for extremely high stress flying, such
as racing, or if an engine larger than one in the
recommended range is used, the modeler is responsible for
taking steps to reinforce the high stress points and/or
substituting hardware more suitable for the increased stress .

9. WARNING: The cowl and tail cone included in this kit are
made of fiberglass, the fibers of which may cause eye, skin
and respiratory tract irritation. Never blow into a part to
remove fiberglass dust, as the dust will blow back into your
eyes. Always wear safety goggles, a particle mask and
rubber gloves when grinding, drilling and sanding fiberglass
parts. Vacuum the parts and the work area thoroughly after
working with fiberglass parts.

Remember:Take y our time and follow the instructions to
end up with a well-built model that is straight and true.

This is the list of hardware and accessories required to finish the
Combat Corsair. Order numbers are provided in parentheses.

❏ 3 channel radio
❏ (3) Micro servos with 34 oz-in of torque
❏ (2) 12” [305mm] ser vo extensions
❏ Engine
❏ Propellers suitable for your engine.

In addition to common household tools and hobby tools, this
is the “short list” of the most important items required to build
the Combat Corsair.

Great Planes Pro™CA and Epoxy glues

are recommended.

❏ R/C foam rubber (1/4" [6mm] - HCAQ1000, or 1/2"

[13mm] - HCAQ1050)

❏ 1/2 oz. [15g] Thin Pro CA (GPMR6001)
❏ 1/2 oz. [15g] Medium Pro CA+ (GPMR6007)
❏ Pro 30-minute epoxy (GPMR6047)
❏ Pro 6-minute epoxy (GPMR6045)
❏ 4-40 tap and drill set (GPMR8101)
❏ #1 Hobby knife (HCAR0105)
❏ #11 blades (5-pack, HCAR0211)
❏ R/C-56 canopy glue (JOZR5007)
❏ CA applicator tips (HCAR3780)

Here is a list of optional tools mentioned in the manual that
will help you build the Combat Corsair.

❏ Epoxy brushes (6, GPMR8060)
❏ Mixing sticks (50, GPMR8055)
❏ Mixing cups (GPMR8056)
❏ Builder’s Triangle Set (HCAR0480)
❏ Curved-tip canopy scissors for trimming

plastic parts (HCAR0667)

❏ Masking tape (TOPR8018)
❏ 2 oz. [57g] spray CA activator (GPMR6035)
❏ Denatured alcohol (for epoxy clean up)
❏ Switch & Charge Jack Mounting Set (GPMM1000)
❏ Rotary tool such as Dremel

®

❏ Rotary tool reinforced cut-off wheel (GPMR8200)
❏ Servo horn dr ill (HCAR0698)
❏ Hobby Heat

™

micro torch (HCAR0750)

❏ Dead Center

™

Engine Mount Hole Locator (GPMR8130)

❏ AccuThrow

™

Deflection Gauge (GPMR2405)

❏ CG Machine

™

(GPMR2400)

❏ Precision Magnetic Prop Balancer

™

(TOPQ5700)

Optional Supplies and Tools

Adhesives and Building Supplies

Hardware and Accessories

ADDITIONAL ITEMS REQUIRED

We, as the kit manuf acturer, provide you with a top quality ,
thoroughly tested kit and instructions, but ultimately the
quality and flyability of your finished model depends on
how you build it; therefore, we cannot in any way
guarantee the performance of your completed model and
no representations are expressed or implied as to the
performance or safety of your completed model.

3

• When you see the term

test fit

in the instructions, it means
that you should first position the part on the assembly
without using any glue, then slightly modify or

custom fit

the part as necessar y for the best fit.

• Whenever the term

glue

is written you should rely upon
your experience to decide what type of glue to use.When
a specific type of adhesive works best for that step, the
instructions will make a recommendation.

• Whenever just

epoxy

is specified you may use

either

30­minute (or 45-minute) epoxy or6-minute epoxy. When 30­minute epoxy is specified it is highly recommended that
you use only 30-minute (or 45-minute) epo xy, because you
will need the working time and/or the additional strength.

• Photos and sketches are placed before the step they
refer to .Frequently you can study photos in following steps
to get another view of the same parts.

• The stabilizer and wing incidences and engine thrust
angles have been factory-built into this model. However,
some technically-minded modelers may wish to check
these measurements anyway.To view this information visit
the web site at www.greatplanes.com and click on
“Technical Data.” Due to manufacturing tolerances which
will have little or no effect on the way your model will fly,
please expect slight deviations between your model and
the published values.

Fuse = Fuselage

Stab = Horizontal Stabilizer

Fin = Ver tical Fin

LE = Leading Edge

TE = Trailing Edge
LG = Landing Gear
Ply = Plywood

" = Inches

mm = Millimeters

SHCS = Socket Head Cap Screw

COMMON ABBREVIATIONS

IMPORTANT BUILDING NOTES

4

ORDERING REPLACEMENT PARTS

Replacement parts for the Great Planes 1/12 Combat Corsair
ARF are available using the order numbers in the
Replacement Parts List that follows. The fastest, most
economical service can be provided by your hobby dealer or
mail-order company.

To locate a hobby dealer, visit the Great Planes web site at

www.greatplanes.com

. Choose “Where to Buy” at the
bottom of the menu on the left side of the page. Follow the
instructions provided on the page to locate a U.S., Canadian
or International dealer. If a hobby shop is not available,
replacement parts may also be ordered from Tower
Hobbies®at www.towerhobbies.com, or by calling toll free
[phone].

Parts may also be ordered directly from Hobby Services by
calling [phone], or via facsimile at [phone],
but full retail prices and shipping and handling charges will
apply. Illinois and Nevada residents will also be charged

sales tax. If order ing via fax, include a Visa®or MasterCard

®

number and expiration date for payment.
Mail parts orders and payments by personal check to:

Hobby Services

3002 N Apollo Drive, Suite 1

Champaign IL 61822

Be certain to specify the order number exactly as listed in
the Replacement Parts List. Payment by credit card or
personal check only; no C.O.D.

If additional assistance is required for any reason contact
Product Support by e-mail at:

[e-mail]

or by telephone at [phone].

Replacement Parts List

Order Number Description How to Purchase

Missing pieces ................................................Contact Product Support

Instruction manual...........................................Contact Product Support

Full-size plans.................................................Not available

Kit parts listed below .......................................Hobby Supplier

GPMA2610............Fuselage Set

GPMA2611............Wing Set

GPMA2612............Tail Set

GPMA2613............Canopy

GPMA2614............Cowl

GPMA2615............Decal Sheet

5

Before starting to build, take an inventory of this kit to make sure it is complete and inspect the parts to make sure they
are of acceptable quality. If any parts are missing or are not of acceptable quality, or if you need assistance with assembly,
contact Product Support. When repor ting defective or missing parts, use the part names exactly as they are written in
the Kit Contents list.

Great Planes Product Support:

3002 N Apollo Drive, Suite 1

Champaign, IL 61822

Telephone: [phone], ext. 5

Fax: [phone]

E-mail:

[e-mail]

KIT INSPECTION

1 Cowl
2 Fuselage
3 Cowl Ring
4 Wing Joiner
5 Engine Mount
6 Canopy
7 Belly Pan

8 Fuel T ank

9 Tail Cone
10 Fin with Rudder
11 Stabilizer with Elevators
12 Right Wing with Aileron
13 Left Wing with Aileron

Kit Contents (Photographed)

(4) 3mm Blind Nuts
(4) 3 x 19mm Machine Screws
(4) 3 x 19mm Sheet Metal Screws
(6) 2x 15mm Screws
(4) 2x7mm Washer Head Screws
(8) 3mm flat Washers
(4) 3mm lock Washers
(1) Elevator Joiner Wire
(2) 2x 15mm Threaded Rod
(1) 1 x 305mm Wire

(1) 1 x 500mm Wire
(1) 2 x 254mm Tube
(3) Nylon Control Horns
(2) Control Horns
(2) Faslinks
(4) Clevis Retainers
(12) Hinges
(1) 2.5mm Allen Wrench

Kit Contents (Not Photographed)

KIT CONTENTS

2

1

4

3

5

12

6

8

7

10

9

13

11

❏ 1. If you have not done so already, remove the major

parts of the kit from the box and inspect for damage. If any
parts are damaged or missing, contact Product Suppor t at
the address or telephone number listed in the “Kit
Inspection” section on page 5.

❏ 2. Remove the tape and separate the ailerons from the

wing and the elevators from the stab.Use a covering iron with
a covering sock on high heat to tighten the covering if
necessary .Apply pressure over sheeted areas to thoroughly
bond the covering to the wood.

Do the right wing first so your work matc hes the photos
the first time through.You can do one wing at a time, or
work on them together.

❏❏1. Test fit the right aileron to the wing with three

hinges. If the hinges don’t remain centered, stick a pin
through the middle of the hinge to hold it in position.

❏❏2. Remove any pins you may have inserted into the

hinges. Adjust the aileron so there is a small gap between

the LE of the aileron and the wing.The gap should be small,
just enough to see light through or to slip a piece of paper
through. Apply six drops of thin CA to the top and bottom of
each hinge. Do not use CA accelerator. After the CA has
fully hardened, test the hinges by pulling on the aileron.

❏❏3. Cut the covering from the opening in the bottom of

the wing for the aileron servo. Use an iron to seal the
covering to the edges of the opening.

❏❏4. On the top of the wing cut the covering inside the

opening for the aileron servo wire to pass through. Use an
iron to seal the covering to the edges of the opening.

❏ 5. Repeat steps 1-4 for the left wing panel.

❏❏1. Installing the servos in the wing will require the use

of two 12" [305mm] servo extensions. One Y-harness
connector is required and is used to allow the aileron servos
to plug into one slot in your receiver. You may have a
computer radio that allows you to plug the servos into
separate slots and then mix them together through the radio
transmitter. If you choose to mix them with the radio rather
than the Y-harness, refer to the instructions with your
particular brand of radio.

Install the Aileron Servos and Pushrods

Install the Ailerons

ASSEMBLE THE WING

PREPARATIONS

6

❏❏2. Attach the ser vo extensions to the aileron servos.

Secure the connectors together using a large piece of heat
shrink tubing, tape or other method for securing the connectors.

❏❏3.Tie the string located inside the servo compartment

to the servo wire. Pull the ser vo wire through the wing with
the string. Feed the servo wire out the hole in the top of the
wing center section. Tape the servo wire to the wing to
prevent it from falling back into the wing.

❏❏4.Install the servo into the opening in the bottom of the

wing. Drill a 1/16" [1.6mm] hole through the mounting holes
of the servo, drilling through the plywood plate in the wing.
Install and remove a servo mounting screw into each of the
holes. Inser t a drop of thin CA into the holes to harden the
wood.After the glue has hardened, mount the servo onto the
blocks using the hardware that came with your servo.Center
the servo and install a servo arm as shown.

❏❏5. Use the nylon mounting plate and two 2 x 16mm

screws to mount a nylon control horn to the aileron as
shown in the photo and the sketch. Use a 5/64" [2mm] drill
to drill the holes for the mounting screws.

❏❏6. Make the aileron pushrod and connect the aileron

to the servo arm using the hardware shown in the photo. If
necessary, enlarge the hole in the servo arm with a 5/64"
[2mm] drill.

❏ 7. Repeat steps 1-6 for the left wing panel.

❏ 1. Glue both plywood wing joiners together with epoxy.

Clamp them together until the glue hardens.

Join the Wings

7

❏ 2. Test fit the plyw ood wing joiner into the joiner pocket in

each wing half. Be careful to make sure that you insert the
joiner positioned as shown.

❏ 3. When satisfied with the fit, apply 30-minute epoxy to

the joiner, the joiner pockets and the root of both wing
halves. Insert the joiner into the pockets. Clean excess
epoxy with denatured alcohol. Hold the wing together by
applying masking tape to the top and bottom of the wing.Set
the wing aside and allow the glue to harden.

❏ 1. Cut the covering from the top and bottom of the wing

revealing the wing bolt holes.

❏ 2.Center the hardwood wing bolt plates over the wing bolt

holes.Use a fine-point felt-tip pen to trace the wing bolt plate
location onto the wing. Cut the covering away from the wing
inside the lines you have dr awn.Use a sharp #11 hobby knife
or use the Expert Tip that follows to cut the covering from the
wing along the lines you have marked. Use care to cut only

into the covering and not into the wood.

HOW TO CUT COVERING FROM BALSA

Use a soldering iron to cut the covering from the stab.The
tip of the soldering iron doesn’t have to be sharp, but a fine
tip does work best. Allow the iron to heat fully. Use a
straightedge to guide the soldering iron at a rate that will just
melt the covering and not burn into the wood.The hotter the
soldering iron, the faster it must travel to melt a fine cut.

Mount the Wing to the Fuselage

8

❏ 3. Glue the plates to the wing. Allow the glue to harden.
❏ 4. From the top of the wing, drill a 1/4" [6mm] hole

through the wing bolt hole and through the wing bolt plates.
Attach the wing to the fuselage with two 1/4-20 x 2" [51mm]
nylon wing bolts.

❏ 5.Cut the covering from the holes in the belly pan. Place

the belly pan in position on the wing.Trace the outline of the
belly pan onto the wing with a felt tip pen.Remove the belly
pan from the fuselage.

❏ 6. Cut away the covering 1/8" [3mm] inside the lines you

have drawn. Glue the belly pan to the wing with 6-minute
epoxy.

Important: Do not use CA. It will melt the foam!

❏ 1. Cut the covering from the slots for the stab and fin and

the pushrod and antenna exits.

❏ 2. If the wing is not mounted to the fuselage, install the

wing to the fuselage.Insert the horizontal stab into the slot
in the side of the fuselage. Make sure the stab is centered
and the distance from the tip of the stab to the tip of the wing
is an equal distance.

❏ 3. Stand back approximately 6' [2m] from the back of the

airplane. Check to be sure the stab is aligned with the wing.
If not, sand the high side of the stab saddle to bring the stab
into alignment.

❏ 4. Trace the outline of the fuselage to the top and the

bottom of the stab.Remove the stab, then carefully cut awa y
the covering inside of the lines you have drawn using the
same technique used for the belly pan. Do not cut the

surface of the wood.This

will

weaken the stab.

Install the Stab and Fin

BUILD THE FUSELAGE

9

❏5. Install the elevator joiner wire into the stab slot.Re-install

the stab into the fuselage. Double-check the stab placement
and alignment to the fuselage. When you are satisfied
everything is properly positioned use thin CA to glue the stab
to the fuselage. Using an extension tip will allow you to apply
the glue easily through the opening for the fin.Apply CA to the
bottom of the stab where the fuse and stab meet, allowing the
CA to wick into the joint.

❏ 6. Install the vertical fin into the slot in the top of the

fuselage. Use a square to be sure the fin is per pendicular to
the stab. Trace the outline of the fuselage onto the fin.
Remove the fin from the fuselage, then cut a wa y the cov ering
using the same technique used on the stab.

❏ 7. Re-install the fin to the fuselage, double check the fin

alignment, and then glue the fin to the fuselage using the
same technique used for the stab.

❏ 8. Remove the wing from the fuselage.

❏❏9. Tape one of the elevators in place on the stab.

Center the elevator joiner wire, then mark where the joiner
goes into the elevator.

❏❏10. Using the reference mark you made, drill a 5/64"

[2mm] hole into the leading edge of the elevator. Hint: Start
the hole with a T-pin, pushing the pin into the elevator. Be
sure the pin goes into the wood straight and does not come
through the surface of the elevator.Once the hole has been
made with the pin, drill out the hole. The pin hole will work
as a guide for the drill to go in straight.

❏❏11. Install three hinges into the slots in the elevator.

Use a T-pin to keep the hinges centered. Apply a small
amount of epoxy to the hole you drilled in the elevator .Insert
the elevator onto the joiner wire while guiding the hinges into
the hinge slots in the stab.Once positioned apply thin CA to
the hinges in the same way you did for the ailerons.

❏ 12. Repeat steps 9-11 for the other elevator.

10

❏ 1. Place the servo into the servo tray, positioning it on the

right side of the fuselage. Drill 1/16" [1.6mm] holes for the
servo screws. Install the ser vo into the servo tray with the
hardware provided with your radio system.

❏ 2. Install the screw-lock connector and 2mm washer into

the outermost hole of the servo arm. Apply a drop of thread­locker to the threads.Then tighten the 2mm knurled nut onto
the connector.

❏ 3.Install the elevator pushrod wire through the hole at the

back of the fuselage, sliding it into the servo compartment
and through the hole in the screw-lock connector.

❏ 4. Install a nylon control horn onto the Z-bend of the

pushrod wire. Install the control horn the same way as was
done with the ailerons.

❏ 5. Center the ser vo.Then tighten the set screw onto the

pushrod wire.

❏ 1. Assemble the fuel tank as shown in the sketch.When

tightening the center screw be sure not to over tighten it.You
just want it snug enough to pull the rubber stopper tight
against the tank.

❏ 2. Position your engine on the engine mount so that the

distance from the back of the mount to the front of the thrust
washer is 3-1/4" [83mm]. Drill a 3/32" [2.4mm] hole through
each of the mounting holes of the engine into the engine
mount. Mount the engine to the mount with four 3 x 15mm
self tapping screws and 3mm flat washers.

Install the Fuel Tank, Engine,

Throttle Servo and Pushrod

Install the Elevator Servo and Pushrod

11

FUEL TANK

SILICONE

FUEL LINE

FUEL

PIPE

FUEL CLUNK

PRESSURE

TAP TO

MUFFLER

TO NEEDLE

VALVE

FIREWALL

❏ 3. On the side of the engine mount are reference marks.

Align the marks that are in line with the engine mounting
rails with the lines on the firewall. Align the center of the
engine with the lines on the firewall.Tack glue the mount to
the firewall.

❏ 4. When positioning your engine, be sure the engine is

centered, but also be sure it is positioned so that the muffler
will be centered over the fiberglass cutout on the left side of
the fuselage.When you are satisfied with the position of the
engine, mark the location of the holes in the engine mount
onto the firewall.

❏5. Remove the engine mount from the firewall.Drill four 1/8"

[3mm] holes though the firewall on each of the four marks.

❏ 6. Install a 3mm blind nut on the back side of the firewall

in each of the four holes.

❏7.Mount the engine mount to the firewall with four 3 x 19mm

screws, 3mm lock washers and 3mm flat washers.

❏ 8. Drill a 3/32" [2.4mm] hole through the firewall, in line

with the throttle arm on the carburetor.Slide the white nylon
guide tube into the hole in the firewall, feeding it back to the
throttle servo.Cut the tube to length.

Refer to this photo for steps 9-12

❏ 9. Mount the throttle servo as shown using the hardware

included with your servo.

❏ 10. Install a screw-lock connector into the outer hole in

the servo arm.

❏ 11. Install the throttle pushrod wire into the tube. The

Z-bend is installed in the throttle arm. Slide the opposite end
of the wire into the screw-lock connector. Adjust the ser vo
arm. Then tighten the set screw against the pushrod wire.

❏ 12. Support the throttle pushrod tube with a piece of

scrap balsa or plywood.

12

❏ 13. Install the fuel tank into the fuselage with the neck of

the tank through the firewall. Hold the tank in place with a
rubber band.

❏ 14. Install silicone fuel tubing onto the aluminum tubes

from the fuel tank.The line with the fuel clunk will feed to the
fuel inlet at the needle valve and the other will attach to the
pressure tap on the muffler.If you choose to use some kind
of an external fuel valve follow the instructions with your
particular brand of fuel valve.You can also install a third line
to the tank and use it for filling the tank.The method you use
is your choice but make your decision before moving onto
the installation of the fuel tank.

❏ 1. Center the cowl ring over the front of the fuselage.

Place the ring so that all four of the mounting tabs will be
accessible once the cowl is installed on the ring. Take into
consideration the placement of the muffler when deciding
exactly where the ring is to be placed.

❏ 2. Drill a 1/16" [1.6mm] hole through each of the

mounting tabs into the fuselage. Mount the cowl to the
firewall with four 2 x 7mm screws and 2mm flat washers.

❏ 3. Cut the cowl ring at the muffler cut out.
❏ 4. Place the cowl onto the cowl ring. Position the cowl so

the engine crankshaft is centered with the center of the cowl.
Once you are satisfied with the placement of the cowl, tack
glue the cowl to the cowl ring with a couple of drops of CA
and CA accelerator. When the glue hardens remove the
cowl and ring from the fuselage.

❏ 5. Mix 1/2 ounce [15cc] of epoxy and micro balloons.

Apply the mixture to the front of the cowl ring and the
fuselage. Allow the mixture to harden.

❏ 6.Make the necessary cut outs in the cowl for the muffler,

needle valve etc.

❏ 7.Fuel proof the cowl ring with a fuel proof paint or epoxy .
❏ 8.If you have not already done so, connect the fuel, vent

and fill lines to the fuel tank and engine.

Mount the Cowl

13

❏ 1. If you will be installing a pilot, do this before installing

the canopy. Glue the canopy to the fuselage with Z-56
Canopy Glue or any good aliphatic glue.

❏ 2. Test fit the tail cone to the fuselage. Cut the tail cone

to fit over the elevator joiner wire. Cut a small strip of
covering from the back of the fuselage to give a gluing
surface for the tail cone.

❏ 3. Glue the tail cone to the fuselage.

Refer to this photograph for the following five steps.

❏ 1. Plug the ser vos into the proper ports in the receiver.

Install a strain relief made from a servo horn as shown in the
sketch. Install the antenna through the antenna tube.

❏ 2. Install the radio switch harness and charge jack. We

used the Ernst Charge Receptacle (ERNM3001) to the side
of the fuselage opposite the muffler.

❏ 3. Plug the switch into the battery .Secure the connectors

with a piece of shrink tube or some other method to keep
them from coming unplugged.

❏ 4.Wrap the receiver and the battery in 1/4" [6mm] foam.

Secure them inside the fuselage with the balsa stick
included in the kit.

❏ 5. Tur n on the radio system and make any adjustments

required to the elevator and throttle pushrods.

❏ 1. Use scissors or a shar p hobby knife to cut the decals

from the sheet.

❏ 2. Be certain the model is clean and free from oily

fingerprints and dust. Prepare a dishpan or small bucket with
a mixture of liquid dish soap and warm water—about one
teaspoon of soap per gallon of water.Submerse the decal in
the soap and water and peel off the paper backing. Note:
Even though the decals hav e a “sticky-back”and are not the
water transfer type , submersing them in soap & water allo ws
accurate positioning and reduces air bubbles underneath.

❏ 3. Position decal on the model where desired. Holding the

decal down, use a paper towel to wipe most of the water a way.

❏ 4. Use a piece of soft balsa or something similar to

squeegee remaining water from under the decal. Apply the
rest of the decals the same way.

Apply the Decals

Install the RadioInstall the Canopy and Tail Cone

14

❏ 1. Tur n on the transmitter and receiver and center the

trims. If necessary, remove the servo arms from the servos
and reposition them so they are centered. Reinstall the
screws that hold on the servo arms.

❏ 2. With the transmitter and receiver still on, check all the

control surfaces to see if they are centered.If necessary, adjust
the clevises on the pushrods to center the control surfaces.

❏ 3. Make certain that the control surfaces and the

carburetor respond in the correct direction as shown in the
diagram.If any of the controls respond in the wrong direction,
use the servo reversing in the transmitter to reverse the
servos connected to those controls. Be cer tain the control
surfaces have remained centered. Adjust if necessary.

Use a Great Planes AccuThrow (or a ruler) to accurately
measure and set the control throw of each control surface as
indicated in the chart that follows.If your radio does not hav e
dual rates, we recommend setting the throws at the low rate
setting. NOTE:The throws are measured at the widest part
of the elevators, rudder and ailerons.

At this stage the model should be in ready-to-fly condition
with all of the systems in place.

❏ 1.Use a felt-tip pen or 1/8" [3mm]-wide tape to accurately

mark the C.G. on the top of the wing on both sides of the
fuselage. The C.G. is located 2-1/2" [64mm] back from

the leading edge of the wing measured at the fuselage.

❏ 2.With the wing attached to the fuselage, all parts of the

model installed (ready to fly) and an empty fuel tank, place
the model upside-down on a Great Planes CG Machine, or
lift it upside-down at the balance point you marked.

This is where your model should balance for the first
flights. Later, you may wish to experiment by shifting the
C.G. up to 1/8” [3mm] forward or 1/8” [3mm] back to
change the flying characteristics. Moving the C.G. forward
may improve the smoothness and stability, but the model
may then require more speed for tak eoff and mak e it more
difficult to slow for landing.Moving the C.G.aft makes the
model more maneuverable, but could also cause it to
become too difficult to control. In any case, start at the
recommended balance point and do not at any time
balance the model outside the specified range.

More than any other factor, the C.G. (balance point) can
have the greatest effect on how a model flies and may
determine whether or not your first flight will be
successful. If you value this model and wish to enjoy it for
many flights, DO NOT OVERLOOK THIS IMPORTANT
PROCEDURE. A model that is not proper ly balanced will
be unstable and possibly unflyable.

Balance the Model (C.G.)

IMPORTANT: The Combat Corsair has been extensively

flown and tested to arrive at the throws at which it flies
best. Flying your model at these throws will provide you
with the greatest chance for successful first flights.If, after
you have become accustomed to the way the Combat
Corsair flies, you would like to change the throws to suit
your taste, that is fine. However, too much control throw
could make the model difficult to control, so remember,
“more is not always better.”

These are the recommended control surface throws:

High Rate Low Rate

ELEVATOR: 3/8" [9.5mm] up 7/32" [5.5mm] up

3/8" [9.5mm] down 7/32" [5.5mm] down

AILERONS: 3/8" [9.5mm] up 1/4" [6mm] up

3/8" [9.5mm] down 1/4" [6mm] down

Set the Control Throws

Check the Control Directions

GET THE MODEL READY TO FLY

15

4-CHANNEL RADIO SETUP

(STANDARD MODE 2)

4-CHANNEL

TRANSMITTER

ELEVATOR MOVES UP

4-CHANNEL

TRANSMITTER

RIGHT AILERON MOVES UP

LEFT AILERON MOVES DOWN

RUDDER MOVES RIGHT

CARBURETOR WIDE OPEN

4-CHANNEL

TRANSMITTER

4-CHANNEL

TRANSMITTER

❏ 3. If the tail drops, the model is “tail heavy”and the battery

pack and/or receiver must be shifted forward or weight must
be added to the nose to balance.If the nose drops, the model
is “nose heavy”and the battery pack and/or receiver must be
shifted aft or weight must be added to the tail to balance. If
possible, relocate the battery pack and receiver to minimize
or eliminate any additional ballast required. If additional
weight is required, nose weight may be easily added b y using
a “spinner weight” (GPMQ4645 for the 1 oz. [28g] weight, or
GPMQ4646 for the 2 oz.[57g] weight).If spinner weight is not
practical or is not enough, use Great Planes (GPMQ4485)
“stick-on”lead.A good place to add stick-on nose weight is to
the firewall (don’t attach weight to the cowl—it is not intended
to support weight). Begin by placing incrementally increasing
amounts of weight on the bottom of the fuse over the firewall
until the model balances. Once you have determined the
amount of weight required, it can be permanently attached. If
required, tail weight may be added by cutting open the
bottom of the fuse and gluing it permanently inside.

Note: Do not rely upon the adhesive on the back of the lead
weight to permanently hold it in place. Over time, fuel and
exhaust residue may soften the adhesive and cause the
weight to fall off .Use #2 sheet metal screws, RTV silicone or
epoxy to permanently hold the weight in place.

❏ 4. IMPORTANT: If you found it necessary to add any

weight, recheck the C.G.after the weight has been installed.

❏ 1. With the wing level, have an assistant help you lift the

model by the engine propeller shaft and the bottom of the
fuse under the TE of the fin.Do this several times.

❏2.If one wing always drops when you lift the model, it means

that side is heavy. Balance the airplane by adding weight to the
other wing tip. An airplane that has been laterally balanced

will track better in loops and other maneuvers.

No matter if you fly at an AMA sanctioned R/C club site or if
you fly somewhere on your own, you should always have
your name, address, telephone number and AMA number
on or inside your model. It is required at all AMA R/C club
flying sites and AMA sanctioned flying events. Fill out the
identification tag on the back cover of this man ual and place
it on or inside your model.

Follow the battery charging instructions that came with your
radio control system to charge the batteries. You should
always charge your transmitter and receiver batteries the
night before you go flying and at other times as
recommended by the radio manufacturer.

Carefully balance your propeller and spare propellers before
you fly. An unbalanced prop can be the single most significant
cause of vibration that can damage your model. Not only will
engine mounting screws and bolts loosen, possibly with
disastrous effect, but vibration may also damage your radio
receiver and battery. Vibration can also cause your fuel to
foam, which will, in turn, cause your engine to run hot or quit.

We use a Top Flite Precision Magnetic Prop Balancer

™

(TOPQ5700) in the workshop and keep a Great Planes
Fingertip Prop Balancer (GPMQ5000) in our flight box.

If the engine is new, follow the engine manufacturer’s
instructions to break-in the engine. After break-in,

confirm that the engine idles reliably, transitions smoothly
and rapidly to full power and maintains full power—
indefinitely. After you run the engine on the model, inspect
the model closely to make sure all screws remained tight,
the hinges are secure, the prop is secure and all pushrods
and connectors are secure.

Ground Check

Balance Propellers

CAUTION: Unless the instructions that came with your

radio system state differently, the initial charge on new
transmitter and receiver batteries should be done for 15
hours using the slow-charger that came with the radio
system.This will “condition” the batteries so that the next
charge may be done using the fast-charger of y our choice.
If the initial charge is done with a fast-charger the
batteries may not reach their full capacity and you may be
flying with batteries that are only partially charged.

Charge the Batteries

Identify Y our Model

PREFLIGHT

Balance the Model Laterally

16

Ground check the operational range of your r adio before the first
flight of the day. With the transmitter antenna collapsed and the
receiver and transmitter on, you should be able to walk at least
100 feet away from the model and still have control. Have an
assistant stand by your model and, while you w ork the controls,
tell you what the control surfaces are doing.Repeat this test with
the engine running at various speeds with an assistant holding
the model, using hand signals to show you what is happening.If
the control surfaces do not respond correctly, do not fly! Find
and correct the problem first. Look for loose servo connections
or broken wires, corroded wires on old servo connectors, poor
solder joints in your battery pack or a defective cell, or a
damaged receiver crystal from a previous crash.

Keep all engine fuel in a safe place, away from high heat,
sparks or flames, as fuel is very flammable. Do not smoke
near the engine or fuel; and remember that engine exhaust
gives off a great deal of deadly carbon monoxide.Therefore
do not run the engine in a closed room or garage.

Get help from an experienced pilot when learning to
operate engines.

Use safety glasses when starting or running engines.
Do not run the engine in an area of loose gravel or sand;the

propeller may throw such material in your face or eyes.
Keep your f ace and body as well as all spectators a wa y from the

plane of rotation of the propeller as you start and run the engine.
Keep these items away from the prop: loose clothing, shir t

sleeves, ties, scarfs, long hair or loose objects such as
pencils or screwdrivers that may fall out of shirt or jacket
pockets into the prop.

Use a “chicken stick” or electric starter to star t the engine.
Do not use your fingers to flip the propeller .Make certain the
glow plug clip or connector is secure so that it will not pop
off or otherwise get into the running propeller.

Make all engine adjustments from behind the rotating propeller .
The engine gets hot! Do not touch it during or right after

operation. Make sure fuel lines are in good condition so fuel
will not leak onto a hot engine, causing a fire.

To stop a glow engine, cut off the fuel supply by closing off
the fuel line or following the engine manufacturer’s

recommendations. Do not use hands, fingers or any other
body part to try to stop the engine.To stop a gasoline powered
engine an on/off switch should be connected to the engine coil.
Do not throw anything into the propeller of a running engine.

Read and abide by the following excerpts from the Academy
of Model Aeronautics Safety Code.For the complete Safety
Code refer to

Model Aviation

magazine, the AMA web site or

the Code that came with your AMA license.

1) I will not fly my model aircraft in sanctioned events, air

shows, or model flying demonstrations until it has been
proven to be airworthy by having been previously,
successfully flight tested.

2) I will not fly my model aircraft higher than approximately

400 feet within 3 miles of an airport without notifying the
airpor t operator. I will give right-of-way and avoid flying in
the proximity of full-scale aircraft. Where necessary, an
observer shall be utilized to supervise flying to avoid
having models fly in the proximity of full-scale aircraft.

3) Where established, I will abide by the safety rules for the

flying site I use, and I will not willfully and deliberately fly my
models in a careless, reckless and/or dangerous manner.

5) I will not fly my model unless it is identified with my name

and address or AMA number, on or in the model. Note:
This does not apply to models while being flown indoors.

7) I will not operate models with pyrotechnics (any device

that explodes, burns, or propels a projectile of any kind).

1) I will have completed a successful radio equipment ground

check before the first flight of a new or repaired model.

2) I will not fly my model aircraft in the presence of spectators

until I become a qualified flier, unless assisted by an
experienced helper.

3) At all flying sites a straight or curved line(s) must be

established in front of which all flying takes place with the
other side for spectators. Only personnel involved with
flying the aircraft are allowed at or in the front of the flight
line. Intentional flying behind the flight line is prohibited.

4) I will operate my model using only radio control

frequencies currently allowed by the Federal
Communications Commission.

5) I will not knowingly operate my model within three

miles of any pre-existing flying site except in
accordance with the frequency sharing agreement
listed [in the complete AMA Safety Code].

9) Under no circumstances may a pilot or other person

touch a powered model in flight; nor should any part of

the model other than the landing gear, intentionally
touch the ground, except while landing.

Radio Control

General

AMA SAFETY CODE (EXCERPT)

Failure to follow these safety precautions may result
in severe injury to yourself and others.

ENGINE SAFETY PRECAUTIONS

Range Check

17

❏ 1. Fuelproof all areas exposed to fuel or exhaust residue

such as the cowl ring, wing saddle area, etc.

❏ 2. Check the C.G. according to the measurements

provided in the manual.

❏ 3. Be certain the battery and receiver are securely

mounted in the fuse.Simply stuffing them into place with
foam rubber is not sufficient.

❏ 4. Extend your receiver antenna and make sure it has a

strain relief inside the fuselage to keep tension off the
solder joint inside the receiver.

❏ 5. Balance your model

laterally

as explained in the

instructions.

❏ 6. Use threadlocking compound to secure critical

fasteners such as the set screws that hold the screws
that hold the carburetor arm (if applicable), screw-lock
pushrod connectors, etc.

❏ 7. Make sure all hinges are securely glued in place.
❏ 8. Reinforce holes for wood screws with thin CA where

appropriate (servo mounting screws, cowl mounting
screws, etc.).

❏ 9.Confirm that all controls operate in the correct direction

and the throws are set up according to the manual.

❏ 10. Make sure there are silicone retainers on all the

clevises and that all servo arms are secured to the
servos with the screws included with your radio.

❏ 11. Secure connections between servo wires and

Y-connectors or servo extensions and the connection
between your battery pack and the on/off switch with
vinyl tape, heat shrink tubing or special clips suitable for
that purpose.

❏ 12. Make sure any servo extension cords you may have

used do not interfere with other systems (servo arms,
pushrods, etc.).

❏ 13. Secure the pressure tap (if used) to the muffler with

high temp RTV silicone, thread locking compound or J.B.
Weld.

❏ 14. Make sure the fuel lines are connected and are

not kinked.

❏ 15. Balance your propeller (and spare propellers).
❏ 16. Tighten the propeller nut and spinner.
❏ 17. Place your name, address, AMA number and

telephone number on or inside your model.

❏ 18. Cycle your receiver battery pack (if necessary) and

make sure it is fully charged.

❏ 19. If you wish to photograph your model, do so before

your first flight.

❏ 20. Range check your radio when you get to the flying field.

The Combat Corsair is a great-flying model that flies smoothly
and predictably. The Combat Corsair does not, however,
possess the self-recovery characteristics of a primary R/C
trainer and should be flown only by experienced R/C pilots.

A fully cowled engine may run at a higher temperature than
an un-cowled engine. For this reason, the fuel mixture
should be richened so the engine runs at about 200 rpm
below peak speed. By running the engine slightly r ich, you
will help prevent dead-stic k landings caused by overheating.

CAUTION (THIS APPLIES TO ALL R/C AIRPLANES): If,
while flying, you notice an alarming or unusual sound
such as a low-pitched “buzz,” this may indicate control
surface

flutter.

Flutter occurs when a control surface (such
as an aileron or elevator) or a flying surface (such as a
wing or stab) rapidly vibrates up and down (thus causing
the noise). In extreme cases, if not detected immediately,
flutter can actually cause the control surface to detach or
the flying surface to fail, thus causing loss of control
followed by an impending crash. The best thing to do
when flutter is detected is to slow the model immediately
by reducing power, then land as soon as safely possible.
Identify which surface fluttered (so the problem may be
resolved) by checking all the servo grommets for
deterioration or signs of vibration. Make certain all
pushrod linkages are secure and free of play. If it fluttered
once, under similar circumstances it will probably flutter
again unless the problem is fixed.Some things which can
cause flutter are; Excessive hinge gap; Not mounting
control horns solidly; Poor fit of clevis pin in horn; Side­play of wire pushrods caused by large bends; Excessive
free play in servo gears; Insecure servo mounting; and
one of the most prevalent causes of flutter;Flying an over­powered model at excessive speeds.

Fuel Mixture Adjustments

IMPORTANT!!!

Flying a model with too few rubber bands can be
dangerous. If the wing momentarily lifts from the
fuselage and acts as though a large amount of “up”
elevator has suddenly been applied because there are
not enough rubber bands or they are too weak, internal
structural damage may result. Even worse, the wing
could actually detach from the fuselage resulting in a
crash. If the model exhibits any tendencies that indicate
there are not enough rubber bands, immediately reduce
power, land and closely inspect the model for damage.
If no damage is found, add more rubber bands.

FLYINGCHECK LIST

18

19

For the first flight it is recommended that you get someone
experienced in hand-launching models.Set your model on a
bench, off of the ground. Start the engine and make all
needed adjustments holding the plane on the bench.
Carefully carry the plane to the area of your flying field you
intend to launch the plane from.

Have an assistant hold the plane from the bottom of the
fuselage. Holding the plane level and pointing into the wind,
run a few steps and allow the plane to fly out of your hand.
There should not be a reason to actually throw the plane.In
fact, throwing the plane can be more difficult than letting the
plane fly out of your hand. Be smooth on the elevator stick,
allowing the model to establish a gentle climb to a safe
altitude before turning into the traffic pattern.

For reassurance and to keep an eye on other traffic, it is a
good idea to have an assistant on the flight line with you.Tell
him to remind you to throttle back once the plane gets to a
comfortable altitude.

Take it easy with the Combat Corsair for the first few flights,
gradually getting acquainted with it as you gain confidence.
Adjust the trims to maintain straight and level flight. After
flying around for a while and while still at a safe altitude with
plenty of fuel, practice slow flight and execute practice
landing approaches by reducing the throttle to see how the
model handles at slower speeds.Add power to see how she
climbs as well. Continue to fly around, executing various
maneuvers and making mental notes (or having your
assistant write them down) of what trim or C.G. changes
may be required to fine tune the model so it flies the wa y you
like. Mind your fuel level, but use this first flight to become
familiar with your model before landing.

To initiate a landing approach, lower the throttle while on the
downwind leg. Allow the nose of the model to pitch
downward to gradually bleed off altitude. Continue to lose
altitude, but maintain airspeed by k eeping the nose down as
you turn onto the crosswind leg.Make your final turn toward
the grass landing area (into the wind) keeping the nose
down to maintain airspeed and control. Level the attitude
when the model reaches the runway threshold, modulating
the throttle as necessary to maintain your glide path and
airspeed. If you are going to overshoot, smoothly advance
the throttle and climb out to make another attempt. When
you’re ready to make your landing, flare when the model is
a foot or so off the deck, shut off the engine and smoothly
increase up elevator until it gently touches down.

One final note about flying your model. Have a goal or flight
plan in mind for every flight. This can be learning a new
maneuver(s), improving a maneuver(s) y ou already kno w, or
learning how the model behaves in certain conditions (such
as on high or low rates). This is not necessarily to improve
your skills (

though it is never a bad idea!)

, but more
importantly so you do not surprise yourself by impulsively
attempting a maneuver and suddenly finding that you’ve run
out of time, altitude or airspeed. Every maneuver should be
deliberate, not impulsive.For example, if you’re going to do
a loop, check your altitude, mind the wind direction
(anticipating rudder corrections that will be required to
maintain heading), remember to throttle back at the top and
make certain you are on the desired rates (high/low rates).
A flight plan greatly reduces the chances of crashing your
model just because of poor planning and impulsive moves.

Remember to think.

Have a ball!

But always stay in control and fly in a safe manner.

GOOD LUCK AND GREAT FLYING!

Landing

Flight

Hand-Launching

OTHER ITEMS AVAILABLE FROM GREAT PLANES

O.S. .25 FX Engine

The economical .25 FX engine has dual ball bearings for
durability and smooth operation, plus a low crankcase
profile that allows for a proportionately taller, semi-squared
head to increase cooling fin area. The needle valve is
remotely mounted for pilot safety, and an O-ring and ratchet
spring minimizes “creep” due to air leaks and vibration.
Muffler is included; glow plug required. OSMG0525

O.S.®.15 LA Engine

Powerful, dependable, user-friendly – that describes the .15
LA sport engine. Its dual-needle carb offers fine-tuned throttle
control.Also included are a 1-piece crankcase with reinforcing
webbing and cooling fins that extend well do wn onto the upper
crankcase.Y ou’ll also appreciate the safety and protection of
the remote needle, mounted on a nylon backplate. Ratchet
springs and O-ring seals help prevent settings “creep.” Also
includes glow plug and muffler. OSMG0015

Displacement: 0.152 cu in
Bore: 0.598 in
Stroke: 0.539 in
Practical RPM: 2,500-18,000
Output: 0.41 bhp @ 17,000 rpm
Weight: 5.0 oz

Displacement: 0.249 cu in
Bore: 0.708 in
Stroke: 0.630 in
Practical RPM: 2,500-19,000
Output: 0.84 bhp @ 18,000 rpm
Weight: 8.8 oz

A competitor's streamer enters your sights. Use your Great Planes Combat Mustang's speed and agility to take a deep bite!
You can be ready to fly in just 7-10 hours. Easy to assemble and afford, the 1/12 scale Mustang features prebuilt balsa/ply
structures that are factory-covered with high-quality, iron-on film. Great Planes also includes a fiberglass cowl, clear canopy,
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GPMA1475

Wingspan: 38.5 in
Flying Weight: 2 - 2.5 lb)
Length: 35 in
Engine Required: 2-stroke .15-.25 cu in
Radio Required: 3-channel with 3 micro servos