Great Planes GPMA1232 User Manual

™

INSTRUCTION MANUAL

Wingspan: 71.5 in [1815 mm]

2

Wing Area: 836 in

Wing Loading: 27−30 oz /ft

[53.9 dm2]

2

[82−92 g/dm2]

Length: 73 in [1855 mm]

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-assembled 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

Weight: 9.75− 10.75 lb

[4420 −4870 g]

Radio: 4– 6 channel

SPECIFICATIONS

Engine: 1.20 cu in [20cc] 2-stroke glow,

1.55 cu in [25cc] 4-stroke glow,
Rimfire 1.20 Brushless
electric

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

INSTRUCTIONS AND WARNINGS CONCERNING THE ASSEMBLY AND USE OF THIS MODEL.

© 2014 Great Planes Model Mfg. A subsidiary of Hobbico, Inc.

Champaign, Illinois

[phone], Ext 5

[e-mail]

GPMA1232

TABLE OF CONTENTS

INTRODUCTION

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

SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . 3

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

Engine Recommendations. . . . . . . . . . . . . . . . . . . . . . 3

Brushless Electric Motor . . . . . . . . . . . . . . . . . . . . . . . 3

Radio Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

ADHESIVES, HARDWARE & OTHER ACCESSORIES. . 4

KIT INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

ORDERING REPLACEMENT PARTS . . . . . . . . . . . . . . . 5

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

ASSEMBLE THE WINGS . . . . . . . . . . . . . . . . . . . . . . . . . 6

ASSEMBLE THE FUSELAGE . . . . . . . . . . . . . . . . . . . . .8

Mount the Landing Gear . . . . . . . . . . . . . . . . . . . . . . . 8

Prepare the Fuselage for Mounting

the Engine (or Electric Motor) . . . . . . . . . . . . . . . . . . . 9

Mount a Glow Engine. . . . . . . . . . . . . . . . . . . . . . . . . 10

Hook Up the Throttle . . . . . . . . . . . . . . . . . . . . . . . . . 11

Install the Fuel Tank. . . . . . . . . . . . . . . . . . . . . . . . . . 11

Mount an Electric Motor . . . . . . . . . . . . . . . . . . . . . . . 12

Cut the Cowl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Mount the Cowl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Mounting the Cowl with Wood Screws . . . . . . . . . . . 21

Finish the Cowl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Hook Up the Rudder and Elevators . . . . . . . . . . . . . . 22

FINAL ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Set the C.G. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Balance the Model Laterally . . . . . . . . . . . . . . . . . . . 25

Set the Control Throws . . . . . . . . . . . . . . . . . . . . . . . 25

PREFLIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Identify Your Model . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Ground Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Range Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

ENGINE /MOTOR SAFETY PRECAUTIONS . . . . . . . . . 26

AMA SAFETY CODE (excerpts) . . . . . . . . . . . . . . . . . . . 27

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Radio Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

CHECK LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

FLYING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

OPTIONAL WOOD/FRP EP MOTOR MOUNT BOX . . . 28
ENGINE CUTOUT TEMPLATE FOR O.S. 1.55FS-a . . . 31

Congratulations and thank you for purchasing the Great Planes
Sequence 1.20 ARF! The Sequence may not have all of the
frills of your exclusive, composite pattern plane, but it’s still
a contender at a fraction of the price. And the Sequence’s
simplicity makes it the perfect entry for beginner/intermediate
pattern pilots or a great practice/backup ship for experienced
pilots. And while we’re at it, the Sequence is a great all-around
sport plane too!

NOTE: An optional wood motor mount for brushless electric
motors is available separately (GPMA4382). This mount allows
outrunners to be “front mounted” and has provisions for geared
inrunners. Full instructions for assembly and mounting are in
the back of the manual on page 28.

For the latest technical updates or manual corrections to
the Sequence 1.20 ARF visit the Great Planes web site at
greatplanes.com. Open the “Airplanes” link, then select the
Sequence 1.20 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.

Academy of Model Aeronautics

If you are not already a member of the AMA, please join! The
AMA is the governing body of model aviation and membership
provides liability insurance coverage, protects modelers’ rights
and interests and is required to fl y at most R/C sites.

Academy of Model Aeronautics

5151 East Memorial Drive
Muncie, IN 47302-9252

Tele. [phone]

Fax [phone]

modelaircraft.org

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

2

SAFETY PRECAUTIONS

ADDITIONAL ITEMS REQUIRED

Protect Your Model, Yourself & Others…
Follow These Important Safety Precautions

1. Your Sequence 1.20 ARF 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 Sequence, if not assembled and operated
correctly, could possibly cause injury to yourself or spectators
and damage to property.

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 unfl yable 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 good condition,
a correctly sized engine, and other components as specifi ed
in this instruction manual. All components must be correctly
installed so that the model operates correctly on the ground
and in the air. You must check the operation of the model and
all components before every fl ight.

5. If you are not an experienced pilot or have not fl own this type
of model before, we recommend that you get the assistance
of an experienced pilot in your R/C club for your fi rst fl ights.
If you’re not a member of a club, your local hobby shop has
information about clubs in your area whose membership
includes experienced pilots.

6. While this kit has been fl ight tested to exceed normal use,
if the plane will be used for extremely high stress fl ying, 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.

Engine Recommendations

The glow engine sizes are straightforward and as printed

on the cover. You cannot get any simpler than with the O.S.

1.20AX 2-stroke. If a 4-stroke is preferred, the O.S. 1.55FS-a
provides gobs of “grunt” to get you through all the advanced
pattern maneuvers. Both engines may use the standard O.S.
muffl ers that come with them.

Propellers: On the O.S. 1.20AX we preferred the APC 16
x 8 propeller (APCQ1608). With the O.S. 1.55FS-a the APC
17 x 8 (APCQ1710) was preferred.

OTHER ACCESSORIES IF USING A GLOW ENGINE:

❍ 1/4" [6.4mm] R/C foam rubber (HCAQ1000)

❍ 3' [900mm] standard silicone fuel tubing (GPMQ4131)

❍ Great Planes Dead Center Hole Locator (GPMR8130)

❍ 8-32 tap and drill set (GPMR8103)

Brushless Electric Motor

The 50-65-450kV RimFire 1.20 powered by a 5,000mAh 6S

battery and APC 17 x 8E propeller fl ies the Sequence 1.20
nicely. With throttle management the Sequence completes the
Intermediate pattern sequence with a little time to spare. This
combination puts out approximately 1900 watts @ 7,700rpm,
85A (static ground readings of a newly-charged battery). In­fl ight, the maximum current draw during full-throttle bursts
will be approximately 72A with an average current draw of
around 40A when using the throttle judiciously. 72A is above
the motor’s 50A constant current limit (but under its 80A surge
limit), so full-throttle may be used only in bursts. Always use
a Watt meter to verify the current your setup is drawing. (See
more about motor setup on page 25.)

7. WARNING: The cowl, landing gear and wheel pants included
in this kit are made of fi berglass, the fi bers of which may cause
eye, skin and respiratory tract irritation. Never blow into a
part (wheel pant, cowl) to remove fi berglass 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 fi berglass parts. Vacuum the parts and the work area
thoroughly after working with fi berglass parts.

We, as the kit manufacturer, provide you with a top quality,
thoroughly tested kit and instructions, but ultimately the
quality and fl yability of your fi nished 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.

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

FOLLOWING ARE THE ITEMS REQUIRED TO
OUTFIT YOUR SEQUENCE WITH THE RIMFIRE 1.20:

❍ ElectriFly RimFire 1.20 brushless motor (GPMG4770)

❍ Great Planes brushless motor mount for large motors

(GPMG1260) OR optional wood motor mount box
(GPMA4282 illustrated on page 28)

❍ Great Planes Silver Series 80A Brushless ESC

(GPMM1860)

❍ FlightPower Pro 50 6S (22.2V) 5000mAh 50C LiPo

(FPWP5103) OR FlightPower EON-X 30 6S (22.2V)
5000mAh 30C LiPo (FPWP6702) OR (2) FlightPower
EON-X 30 3S (11.7V) 5000mAh 30C LiPo (FPWP6698)
and ElectriFly series adapter (GPMM3143)

NOTE: See LiPo Battery Charger Requirements on page
4 to help you decide on a battery.

❍ Great Planes 6mm male/4mm female bullet adapters

(GPMM3119) OR Great Planes 4mm female bullet
connectors (GPMM3115) and 3/16" [5mm] heat shrink
tubing (GPMM1056)

3

❍ Great Planes adhesive-back Velcro (GPMQ4480)

11/16"

[18mm]

❍ Electrifl y Powermatch Power Meter Balancer (GPMM3220)

IMPORTANT:
adapter plugs, refer to the Battery Precautions on page 12.

OPTIONAL:

If using the GPMG1260 brushless motor mount for large
motors, it is suggested to replace the Phillips screws and
thin washers that come with the mount with socket-head cap
screws and regular washers (see page 13):

❍ 3 x 8mm socket-head cap screws (DTXC8640)

❍ 3mm fl at washers (DUBQ3307)

A 2.0mm precision-machined hex driver (DTXR0289) is also

suggested for securely tightening the set screws in the collar
on the shaft of the RimFire 1.20

The preferred propeller for the RimFire 1.20 on 6S is either
the APC 17 x 8E (APCQ4018) or the Xoar 17 x 8 Electric
Series propeller (XOAQ4073).

Note: The battery wires from the ESC will have to be extended
to reach the battery. See page 14 for more details. Following
are the items that will be required:

❍ 2’ Deans 12 gauge silicone wire (WSDC1000)

❍ Deans Ultra Plug™ set (WSDM3001)

❍ Electrical solder, soldering fl ux, soldering iron

LIPO BATTERY CHARGER REQUIREMENTS

A LiPo-compatible battery charger with cell balancing is required.
When shopping for a charger (if you don’t already have one)

select a charger (and DC power supply if required) capable
of enough power (Watts) to charge your batteries within an
acceptable time—usually one hour. Once you calculate the Watts
required add in a factor of 20% for loss from normal ineffi ciency:

To fi nd out how many Watts are required to charge a 6S,

5,000mAh battery, fi rst multiply the number of cells (6) times
the Voltage of a fully-charged LiPo cell (4.2V):

Then multiply the Voltage of the fully-charged pack by the

pack’s capacity in Amps:

Finally, increase the Watts needed from a charger by a factor

of 20%:

126 Watts x .2 = 25W + 126W = approximately 150 Watts.

You will need a charger capable of approximately 150 Watts

to charge a 6S 5000mAh battery in about one hour.

If you use two 5000mAh 3S batteries connected in series
with a series adapter you will need a charger capable of
approximately 75 Watts (3 x 4.2 x 5 = 63 + (63 x .2) = 75W).
But then you will have to charge each battery separately

(unless you purchase a charger with multiple charging ports).

If your charger is not capable of the Watts required you should still
be able to charge the battery, except it will take more than one hour.

Before connecting multiple battery packs with

6 x 4.2V = 25.2V

25.2V x 5A = 126 Watts

Radio Equipment

The Sequence can be fl own with as few as four channels, but

the ailerons will have to be connected to the same channel
in the receiver via a dual servo connector (FUTM4130 for
Futaba) and the elevator servos will have to be connected to
the same channel via a servo reverser (FUTM4150). If fl ying
with six channels, the ailerons and elevators can be linked
electronically through the programming in the transmitter to
allow for unlimited mixing/fi ne-tuning options.

Pattern fl yers typically prefer digital servos. Powering the
servos from a 6V receiver battery is also in-line with current
pattern practices, but make certain the servos you chose
are compatible with 6 Volts. Following are the recommended
Futaba servos with the associated servo extensions illustrated
in the manual—if setting up your model differently, different
extensions may be required:

❍ Rudder: S9155 (FUTM0215)
❍ Elevators (2): S9650 (FUTM0260) (2 pcs. 36" [915mm]

servo extension—TACM2726)

❍ Ailerons (2): S9252 (FUTM0222) (4 pcs. 6" [150mm]

servo extension—TACM2701)

❍ Throttle (for glow): S3102 (FUTM0034) (12" [305mm]

servo extension—TACM2711)

❍ HydriMax 1600mAh 6.0V NiMH (HCAM6342) or 2000mAh

6.0V NiMH (HCAM6351) receiver battery

❍ Futaba Switch Harness (FUTM4370)
❍ Great Planes 3"[75mm] double-sided servo arm (for the

rudder servo, GPMM1165)

NOTE:

The elevator

servos must
measure no
more than 11/16"
[18mm] from
the bottom up
to the mounting
grommets in order to fi t in the horizontal stabilizers. Taller
servos will require shimming to fi t.

ADHESIVES, HARDWARE AND

OTHER ACCESSORIES

Other than common hobby tools here is a list of the rest of
the items required:

❍ 1/2 oz. [15g] Thin Pro CA (GPMR6001)
❍ 1/2 oz. [15g] Medium Pro CA+ (GPMR6007)
❍ 2 oz. [57g] spray CA activator (GPMR6035)
❍ Threadlocker thread locking cement (GPMR6060)
❍ 2-1/2" spinner (GPMQ4770)
❍ 8mm Propeller Reamer (for O.S. engines or RimFire

1.20 brushless motor) (GPMQ5007)

❍ Drills bits: 1/16" [1.6mm], 3/32" [2.4mm], 1/8" [3.2mm],

7/32" [5.6mm], 7/64" [2.8mm]

4

A Robart Super Stand II (ROBP1402) is also indispensable

for working on your Sequence 1.20.

Following are the MonoKote colors used on the Sequence

1.20 should repairs or patches ever be required.

White (TOPQ0204) Sky Blue (TOPQ0206)
Orange (TOPQ0202) Sapphire Blue (TOPQ0226)
Pink (TOPQ0215) Matte Dove Gray (TOPQ0511)

KIT INSPECTION

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 reporting 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 Ph: [phone], ext. 5
Champaign, IL 61822 Fax: [phone]

E-mail: [e-mail]

ORDERING REPLACEMENT PARTS

Replacement parts for the Great Planes Sequence 1.20 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

greatplanes.com. Choose “Where to Buy” at the upper right
side of the page. Follow the instructions provided on the page
to locate a U.S., Canadian or International dealer.

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
ordering via fax, include a Visa® or MasterCard® number and
expiration date for payment.

Mail parts orders Hobby Services
and payments by 3002 N Apollo Drive, Suite 1
personal check to: 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 productsupport@greatplanes.
com, or by telephone at [phone].

REPLACEMENT PARTS LIST

Order No. Description

GPMA4370
GPMA4371
GPMA4372
GPMA4373
GPMA4374
GPMA4375
GPMA4376

FUSELAGE
WING
STABLIZER
RUDDER
CANOPY/HATCH
COWL
LANDING GEAR

Order No. Description

GPMA4377
GPMA4378
GPMA4379
GPMA4380
GPMA4381
GPMA4382

WHEEL PANTS
WING TUBE
STABILIZER TUBE
DECALS
WING BOLTS (2)
MOTOR MOUNT
BOX PARTS SET

KIT CONTENTS

Kit Contents

1.

1

2 2

4

8

5

12

6

7

11

10

33

9

5

Fuselage

2.

Wing Halves

3.

Horizontal Stab Halves

4.

Cowl

5.

Main Landing Gear

6.

Main Wheels

7.

Wheel Pants

8.

Wing Tube

9.

Tailwheel Hardware

10.

Fuel Tank

11.

Glow Engine Mount

12.

ESC Mount Set

ASSEMBLE THE WINGS

4. Use thin CA followed by a small fi llet of medium CA to

❏

reinforce the servo mounting blocks to the hatch covers.

1. Pull hard on the ailerons to test the hinges. Inspect the

❏

hinges to be sure enough glue has been used. Add a few
drops of thin CA to any hinges that look dry. Note: CA “fogging”
deposited on the covering can be cleaned with CA debonder.

2. Remove the aileron hatch covers and use naphtha

❏

(lighter fl uid) or commercially-available sticker removal

fl uid to wipe away any glue left from the tape that held on
the hatches.

5.

With the servos plugged in and the radio turned on, use

❏

the plastic servo arm gauge to fi nd the servo arms that will
align with the gauge as shown. (This will allow the servo arms
to be perpendicular to the pushrods.) Cut the other arms off.

6.

If using the included Great

❏

Planes 4-40 ball links, enlarge the
holes in the servo arms with a 7/64"
or 1/8" [2.8mm or 3.2mm] drill.

7/64" or 1/8"

[2.8mm–3.2mm]

3. Refer to the “How to Tighten Covering on ARF Models”

❏

sheet and remove wrinkles and bond the covering to the
wings. You can go over the whole model now, or just start
with the wings and get to the rest of the model later.

7. Temporarily mount the aileron servos to the mounting

❏

blocks by drilling 1/16" [1.6mm] holes for the screws.
Remove the screws and servos. Use a few drops of thin
CA to harden the screw holes. Allow the CA to harden before
remounting the servos.

6

NOTE: Every time wood screws are used throughout
the rest of assembly always perform this procedure of
installing and removing the screws, then hardening the
holes with thin CA.

8. Add a 6" [150mm] servo extension to each aileron

❏

servo. Secure the connections with 1-1/2" [40mm] pieces of
the included heat shrink tubing as shown. Use a heat gun to
shrink the tubing.

11. Cut and remove the covering from around the base

❏

of the horns.

12. Securely glue the horns in to position with CA.

❏

9. Mount the servos to the hatches—be certain the servo

❏

arm screws are in place. If you used metal-gear servos, use
a small drop of threadlocker on the threads.

10.

❏

Same as was done for the

4-40 ball links, enlarge

Roughen the tabs
on two of the included,
fi berglass control horns.

servo arms, if using the
included Great Planes

the holes. Without any
glue, test fi t the horns
into the slots—be certain
the horns fi t all the way
down and make any adjustments for a proper fi t

.

13. Drill out the screw holes in the hatch cover frame with

❏

a 1/16" [1.6mm] drill.

Refer to this photo while hooking up the ailerons:

14. Guide the aileron servo wires out the end of the wing

❏

and mount the hatch covers with four #2 x 3/8" [9.5mm]
button-head screws—do not use a ball-end hex wrench.
Use a quality, machine-ground hex driver. If you don’t have
a good hex driver you could replace the included button­heat screws with Phillips screws and washers (not included)
instead. Don’t forget to temporarily remove the hatch covers,
harden the screw holes with thin CA and allow to harden
before remounting the hatches.

7

Threaded Coupler

4-40 Pushrod

2-1/4" [57mm]

15. Make the aileron pushrod from a 4-40 x 4-1/2" [115mm]

4-40x 3/8"

SHCS

4-40x 1/2"

SHCS

4-40 Ball Link

Aileron Horn

4-40 Nut

(Use threadlock)

4-40 Nut

(Use threadlock)

4-40 Ball Link

Stand-Off
(optional)

Flat spot

1" [25mm]

❏

pushrod cut to a length of 2-1/4" [57mm]. Clean the pushrod
with denatured alcohol, scuff the end with sandpaper, then
silver solder on a 4-40 threaded coupler.

ASSEMBLE THE FUSELAGE

CAUTION: The turtledeck and fuselage bottom of the
Sequence 1.20 are made from balsa-covered foam.
Some solvents and adhesives will attack the foam, so use
care—especially when using CA which will defi nitely “eat”
into the foam.

Mount the Landing Gear

❏ 16. Connect the aileron horn to the servo arm with the

hardware shown in the illustration—the stand-off on the
aileron horn is optional and not used with the servos shown,
but if your servo spacing is different the standoffs may be
used to keep the pushrod perpendicular to the aileron horn.
Be sure to use threadlocker on the nuts.

1. If you haven’t yet done so, use a covering iron with a

❏

cover sock to go over the fuselage to remove any wrinkles
and bond the covering to the airframe—remember to support
the inside of the sheeting where possible.

2. Test-fi t the main landing gear legs in the fuselage to

❏

distinguish the left from the right and mark them as such.

17. Glue a large alignment pin into the end of each wing.

❏

3. Mount 5/32" [4mm] axles to the main landing gear with

❏

the large lock nuts and threadlocker. Use a rotary tool with a
fi ber-reinforced cutoff wheel to accurately cut the axles to a
length of 1" [25mm], as shown in the illustration. Grind or fi le
a fl at spot on the end of both axles.

8

Fiberglass

Wheel Pant

4-40x3/8" [10mm] Phillips

and #4 Flat Washers

5-32" [4mm]
Wheel Collar

#6 Washers

(as spacers) 6-32" Set Screw

4. Mount the wheels and wheel pants as shown—don’t

Vertical Tick Marks

Horizontal

Tick Marks

Angled

Tick Marks

Angled

Tick Marks

❏

forget to use threadlocker on all the screws.

Prepare the Fuselage for Mounting

the Engine (or Electric Motor)

1. If using the O.S. 1.55 FS-a, remove the bottom cutout

❏

for the muffl er. If using a brushless electric motor, remove all
the other cutouts instead. Use epoxy to seal the MonoKote
around F-1, the seams around the cutouts not removed and
the edges of the cutouts you did remove.

5. Mount the main landing gear in the fuselage with

❏

#8 x 1/2" [13mm] SHCS (socket-head cap screws), #8

lock washers and fl at washers—note that the inner screw
on each gear leg uses no washers so the heads will not
protrude too much above the fuel tank/battery plate. As you
have been doing all along, be certain to use threadlocker on
all the screws.

6. Mount the tail wheel with a 3/32" [2.4mm] wheel collar

❏

and a 4-40 set screw and threadlocker.

2. If mounting a glow engine drill 1/16" [1.6mm] pilot

❏

holes through the fi rewall at the four horizontal and vertical

9

tick marks. If mounting the Great Planes Brushless Motor
Mount for Large Motors drill the holes through the fi rewall

at the four angled tick marks. If mounting the optional wood
motor mount box, refer to the instructions on page 28 and
assemble/mount the box as illustrated.

3. Enlarge the holes with a 7/32" [5.6mm] drill to

❏

accommodate the 8-32 blind nuts. Draw the blind nuts into
the back of the fi rewall with a #8 SHCS (socket-head cap
screw) and washers.

Mount a Glow Engine

Refer to this photo for the following two steps.

1. Temporarily mount the included engine mount to the

❏

fi rewall with four 8-32 x 1" [25mm] SHCS, #8 lock washers
and fl at washers. Clamp your engine to the mount so the
drive washer will be 6-7/16" [164mm] from the fi rewall.

2. Mark the engine mounting bolt holes with a Great

❏

Planes Dead Center Hole Locator (GPMR8130).

4. If you will be mounting the cowl with the optional cowl

❏

ring, drill 1/8" [3.2mm] holes 3/8" [9.5mm] deep into the
fuselage sides through the two laser-cut holes in F-1. (If

you’re not certain how you will mount the cowl, read ahead

about what’s involved to help you decide.)

If mounting an electric brushless motor skip ahead to

“Mount an Electric Motor” on page 13.

3. Take the mount off the fi rewall and drill #29 (or 9/64"

❏

[3.6mm]) holes at the marks. Tap 8-32 threads into the
holes—a variable speed hand drill makes tapping the
threads fast and easy!

4. Fasten the engine mount back onto the fi rewall and bolt

❏

the engine to the mount with four 8-32 x 1" [25mm] SHCS
and #8 lock washers.

10