Top Flite A0101 INSTRUCTION BOOK

WARRANTY.....Top Flite Models guarantees this kit to be free of 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 Top Flite’s liability exceed the original cost of the
purchased kit. Further, Top Flite reserves the right to change or modify this warranty without notice.

In that Top Flite 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 immediately return this kit in new and unused condition to the place of purchase.

Top Flite Models

P.O. Box 788

Urbana, Il 61803

Technical Assistance - Call [phone]

www.top-flite.com

CRS6P03 V3.1

READ THROUGH THIS INSTRUCTION BOOK FIRST. IT CONTAINS IMPORTANT INSTRUCTIONS AND WARNINGS CONCERNING THE ASSEMBLY AND USE OF THIS MODEL.

Entire Contents © Copyright 2002

USA

MADE IN

™

Introduction............................................3

Precautions............................................3

Die-Cut Patterns ...............................4-5

Decisions You Must Make Early in the

Building Process ...................................6

Engine & Mount Selection ....................6

Full Cockpit (optional)...........................6

Flaps.....................................................6

Retracts ...............................................6

Common Abbreviations........................6

Types of Wood .......................................6

Supplies & Tools Needed......................6

Other Items Required............................7

Get Ready to Build.................................7

Build the Stab ........................................7

Build the Fin ..........................................8

Build the Elevators................................8

Build the Rudder....................................9

Build the Wing .....................................10

Tip Panels.............................................12

Wing Joining........................................13

Wing Structure Completion................14

Wing Sheeting......................................15

Fuselage Top........................................19

Fuselage Bottom .................................22

Wing Mounting.....................................26

Stab & Fin Mounting............................27

Firewall & Engine Installation.............30

Flaps .....................................................31

Tips for Robart Hinge Points...............33

Wing Tips .............................................34

Ailerons ................................................34

Finishing...............................................35

Cowl Finishing ....................................35

Final Sanding .....................................35

Fuelproofing........................................35

Balance the Airplane Laterally ...........36

Covering...............................................36

Recommended Covering Sequence...36

Apply the Decals & Trim......................36

Hinging .................................................37

Final Control Hardware Hookups.......38

Cockpit Finishing.................................38

Retracts Notes .....................................39

Cooling Notes ......................................40

Control Surface Throws......................40

Install Receiver, Switch & Battery......40

Balance Your Model.............................40

Final Hookups and Checks.................41

Preflight................................................41

Charge the Batteries...........................41

Find a Safe Place to Fly......................41

Ground Check the Model....................41

Range Check Your Radio ...................41

Engine Safety Precautions .................41

AMA Safety code .................................42

Flying....................................................42

Takeoff ................................................42

Flight...................................................43

Landing...............................................43

Flap Operation....................................43

Three-view drawing..............Back cover

2

PROTECT YOUR MODEL, YOURSELF &

OTHERS – FOLLOW THIS IMPORTANT

SAFETY PRECAUTION

Your Top Flite F4U Corsair is not a toy,
but rather a sophisticated, working model that
functions very much like an actual airplane.

Because of its performance, the Corsair, if not
assembled and operated correctly, could possibly
cause injury to yourself or spectators and
damage property.

To make your R/C modeling experience totally
enjoyable, we recommend that you get
experienced, knowledgeable help with
assembly and during your first flights. You’ll

learn faster and avoid risking your model before
you’re truly ready to solo. Your local hobby shop
has information about flying clubs in your area
whose membership includes qualified instructors.

You can also contact the national Academy of
Model Aeronautics (AMA), which has more than
2,500 chartered clubs across the country. Through
any one of them, instructor training programs and
insured newcomer training are available.

Contact the AMA at the address or toll-free phone
number below:

Academy of Model Aeronautics

5151 East Memorial Drive

Muncie, IN 47302-9252

Telephone: [phone]

Fax: [phone]

INTRODUCTION

Thank you for purchasing the Top Flite GOLD
EDITION Corsair.

The Top Flite F4U Corsair is a sport scale model of
the Chance Vought F4U Corsair. This kit may be
built as a sport model for sport flying or detailed out
for sport scale competition. Either way, the model
possesses a very good scale outline.

The decals in the kit (and shown on the box cover)
duplicate a Korean war vintage F4U-4 Corsair
which lends itself well to a MonoKote®covering.
Most other types of the Corsair line, such as
the F4U-1A, may be built from this kit with
minor modifications.

Several color photo sets and 3-view drawings
suitable for sport scale documentation are
available from:

Scale Model Research

3114 Yukon Ave.

Costa Mesa, CA 92626

[phone]

The Top Flite Corsair is designed to fly as good as
it looks. The outer wing panels have jig tabs that
automatically build in approx. 1-1/4 degrees of
washout to prevent tip stalling. The computer­designed, interlocking structure allows you to build
a straight and true model that will fly great.

This model aircraft is not for beginners. The Top
Flite Corsair has excellent flight characteristics and
is very maneuverable, but it is quite fast and does
not have the required stability and self recovery
characteristics of a good R/C trainer. A pilot should
be confident flying a sport aircraft with ailerons
before attempting to fly the Corsair.

Please inspect all parts carefully before starting to
build! If any parts are missing, broken or defective,
or if you have any questions about building or
flying this model, please call us at [phone]
and we'll be glad to help. If you are calling for
replacement parts, please look up the part
numbers and the kit identification number
(stamped on the end of the carton) and have them
ready when calling.

PRECAUTIONS

1. You must build the plane according to the plan
and instructions. Do not alter or modify the model,
as doing so may result in an unsafe or unflyable
model. In a few cases the plan and instructions
may differ slightly from the photos. In those
instances you should assume the plan and written
instructions are correct.

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

3. You must use a proper R/C radio that is in first
class condition, the correct sized engine and
correct components (fuel tank, wheels, etc.)
throughout your building process.

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

5. You must test the operation of the model before
the first and each successive flight to insure that all
equipment is operating, and you must make certain
that the model has remained structurally sound. Be
sure to check external nylon clevises often.
Replace any that show signs of wear.

6. You must fly the model only with the competent
help of a well experienced R/C pilot if you are not
already an experienced R/C pilot at this time.

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

NOTE: We, as the kit manufacturer, can

provide you with a top quality kit and great
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

4

DIE-CUT PARTS

5

DIE-CUT PARTS

SUPPLIES AND TOOLS NEEDED

❏ 2 oz. Thin CA Adhesive (GPMR6003)
❏ 2 oz. Medium or Thick CA (GPMR6009)
❏ 6-Minute Epoxy (GPMR6045)
❏ 30-Minute Epoxy (GPMR6047)
❏ Hand or Electric Drill
❏ Drill Bits: 1/16", 3/32", 1/8", 5/32", 3/16",

13/64", 7/32", 1/4", and 5/16"

❏ Soldering Iron & Silver Solder
❏ Sealing Iron (TOPR2100)
❏ Heat Gun (TOPR2000)
❏ Hobby Saw (Razor Saw)
❏ Hobby Knife, #11 Blades
❏ Plier
❏ Screwdrivers (Phillips & Flat Head)
❏ T-Pins (HCAR5150)
❏ Straightedge
❏ Short Ruler
❏ Masking Tape (required for construction)
❏ Sandpaper (coarse, medium, fine grit)*
❏ Bar Sanders (see below)
❏ Waxed Paper
❏ Lightweight Balsa Filler (HCAR3401)
❏ 1/4-20 & 8-32 Tap, (GPMR8105) (GPMR8103)
❏ Tap Wrench
❏ Isopropyl Rubbing Alcohol (70%)
❏ Rotary tool (Dremel

®)

) or similar (optional)

On our workbench, we have four 11" Great
Planes®Easy-Touch™Bar Sanders, equipped

with #50, #80, #150 and #220-grit sandpaper.
This setup is all that is required for almost any
sanding task. Custom sanding blocks can be
made from balsa for sanding hard to reach spots.
We also keep some #320-grit wet-or-dry
sandpaper handy for finish sanding before

covering. Great Planes Easy-Touch Bar

6

DECISIONS YOU MUST MAKE

EARLY IN THE

BUILDING SEQUENCE

ENGINE AND MOUNT SELECTION

The recommended engine size range is as follows:

.60 to .90 cu. in. 2-stroke
.90 to 1.20 cu. in. 4-stroke

NOTE: The smaller engines in the range provide

more than enough power to fly the Corsair well. Do
not hesitate to use them.

The instructions show an OS®.61 2-stroke engine
side mounted at a 45 degree inverted position. It
also shows a Top Flite internal muffler
(TOPQ7915). This power package works very well.
Most .61 2-stroke engines will fit in the supplied
EM60120 engine mount.

The instructions also show the installation of an OS

1.20 4-stroke engine. Even though it is shown
mounted inverted, it could also be mounted upright
or on its side; the decision is yours. Flexible exhaust
systems are available for most 4-stroke engines and
there is more than enough room inside the Corsair’s
cowl to route the exhaust out the bottom. You would
also have to change the cowl mounting. The engine
is shown on the plans mounted to a JT-122 SV
isolation mount which may no longer be available.
The supplied EM60120 mount will fit the O.S. 1.20.

FULL COCKPIT

(Optional)

You must decide before you build the fuselage if
you will be adding the optional full cockpit kit
(TOPQ8404) to your Corsair. If you are undecided,
you should build it as though you are going to
install it. That way you can add it at a later time
should you want to.

FLAPS

You must decide early in the building process if
you are going to use operating wing flaps. These
are not required but do add to the Corsair's
appearance and flyability. The flaps as described
in this manual work very well, giving super stable
slow flight with virtually no trim changes. Obviously
there is some extra work and craftsmanship
required to fit operating flaps to the model. If you
use operating flaps, you will need to have (2)
standard servos and small Robart hinge points
(ROBQ2508) available during construction.

RETRACTS

You will need to decide early whether you intend to
use retractable landing gear in your Corsair.
Robart 100 degree rotating retracts (ROBQ1815)
were used in the prototypes and the rib spacing
and mounts in the kit are designed to accept them.
Century Jet Models 90 degree rotating retracts
(CJMQ3055) will also work as well. Other retracts
have not been tested.

COMMON ABBREVIATIONS USED IN

THIS BOOK AND ON THE PLANS:

Deg. = Degrees Ply = Plywood
Elev = Elevator Rt = Right
Fuse = Fuselage Stab = Stabilizer
LE = Leading Edge TE = Trailing Edge

(front) (rear)
LG = Landing Gear " = Inches
Lt = Left Tri = Triangle

TYPES OF WOOD

Sanders are made from lightweight extruded

aluminum and can be found at most hobby shops.
They are available in three sizes – 5-1/2"
(GPMR6169) – 11" (GPMR6170) for most general
purpose sanding and 22" (GPMR6172) for long
surfaces such as wing leading edges. We
recommend using the 2" wide self-adhesive
sandpaper sold in 12' rolls by Great Planes.
Standard sandpaper can be attached by gluing it
to the sander with brush-on rubber cement. Apply
the rubber cement to both the bottom of the
sander and the back of the sandpaper. When both
surfaces are dry to the touch, press the sandpaper
firmly onto the sander. Spray adhesive can be
used for this purpose but it’s much harder to
remove the sandpaper when you need to replace
it. Use a knife blade for cutting sandpaper, not
your good scissors!

GET READY TO BUILD

❏

1. Unroll the plan sheets. Reroll the plan sheets

inside out to make them lie flat.

❏ 2. Remove all parts from the box. As you do,

determine the name of each part by comparing it
with the plan. Using a felt-tip pen, write the part
name or size on each piece to avoid confusion later.
Use the die-cut patterns shown on pages 4 and 5 to
identify the die-cut parts and mark them before
punching out. Save all scraps. If any of the die-cut
parts are difficult to punch out, do not force them!
Instead, first cut around the parts with a hobby knife.
After punching out the die-cut parts, use your bar
sander or sanding block to lightly sand the edges to
remove any die-cutting irregularities.

❏ 3. As you identify and mark the parts, separate

them into groups, such as fuse (fuselage), wing, fin
and stab (stabilizer), and hardware.

BUILD THE STAB

❏

1. Arrange the stab portion of the plan on a

flat building board (you may wish to cut out the
stab section). Cover the area over the stab with
waxed paper.

7

OTHER ITEMS REQUIRED

❏ Four-Channel Radio with 4 servos (additional

channels and servos required if retracts and/or
flaps are used).

❏ Top Flite Power Point

®

Propellers (see engine

instructions for recommended sizes)

❏ Prop Safety Nut (Great Planes has sizes and

styles that work nicely)

❏ 12 oz Fuel Tank (DUBQ0212)
❏ 5/32" Wheel Collars - 4 (GPMQ4306)
❏ 3/32" Wheel Collars - 2 (GPMQ4302)
❏ Top Flite MonoKote Covering Material (Insignia

Blue and Yellow)

❏ Fuelproof Paint* for Cowl, Canopy and Oil

Coolers (Top Flite LustreKote™recommended)

❏ Latex Foam Rubber Padding, 1/4" thick

(HCAQ1000)

❏ Silicone Fuel Tubing (GPMQ4131)

❏ Plastic Pilot: Williams Bros. Standard, 2" Scale

#17600 (WBRQ1050)

❏ Main Gear Retracts (optional)...Robart #615

(ROBQ1815) Century Jet 33325 - complete
kit (CJMQ3055)

❏ Air Control Kit (optional retracts)...Robart

#188VRX (ROBQ2307) (Not required with CJ

33325)

❏ Oleo Robo Struts (optional)...Robart #650

(ROBQ1700) (Not required with CJ 33325)

❏ Hinge Points (optional flaps)...Robart #308

(ROBQ2508)

❏ 3-1/4" Main Wheels...Robart #134 (ROBQ1534)
❏ 1-1/4 Tail Wheel (GPMQ4242)
❏ .60 to .80 2-stroke, .90 to 1.20 4-stroke

NOTE: Top Flite “LustreKote Paint” matches

MonoKote covering and is available in aerosol cans.

❏ 2. Cut the balsa 3/8" x 5/8" x 24" LE stock to fit

nicely at the center joint. Save excess material for
the fin LE. Trim the tip of the LE to the approximate
shape on the plan but leave about 1/16" excess for
final shaping later.

❏ 3. Cut the balsa 1/4" x 3/8" x 30" TE stock to

the correct length. Extra material is kept for the Fin.

❏ 4. Cut the two elevator tip blocks from the 1/2"

x 1/2" x 4" balsa stick provided. Shape the tips to
match the plan shape.

❏ 5. Make the stab tips from excess 3/8" x 5/8" LE

stock. Set the previously made parts aside for now.

❏ 6. Make a top and bottom stab skin by placing

the 1/16" die-cut balsa pieces, stab front and stab
back, together over waxed paper and glue them

together with thin CA. Block sand the skins lightly
with 220-grit sandpaper.

❏ 7. Pin the bottom skin to the stab plan. Draw

tick marks for the rib spacing on the skin to match
the plan. Glue the LE and TE pieces on top of the
bottom skin.

❏ 8. Cut the “ribs” from two 3/32" x 3/8" x 24"

balsa sticks. Align them with the “tick” marks and
glue in place. Do not overlook the two angled
pieces in the center over the fuse stab base.

❏ 9. Check the fit of the stab tips. Sand if

necessary, then glue them in place.

❏ 10. Use a bar sander to flatten the top of the

exposed structure. No parts should be left high or
low. Check all glue joints and add glue to any that
appear weak.

❏ 11. Glue on the top stab skin with medium or

slow CA. Be sure to apply glue to all ribs as well

as the LE and TE.

❏ 12. True the stab tips to match the die-cut

stab skins.

❏ 13. Draw a centerline around the stab to help

you maintain symmetry during sanding. Rough
shape the LE and the tips to the approximate cross
section shown on the plan.

BUILD THE FIN

❏

1. Trim the 3/8" x 5/8" LE and the 1/4" x 3/8" TE

to match the plan. Notice that they extend down

into the formers.

❏ 2. Make a left and a right fin skin by placing the

die-cut 1/16" balsa fin front and fin back together

over waxed paper and applying thin CA to the joint.
Block sand lightly.

❏ 3. Pin the right skin to the plan. Glue the LE and

TE on top of the skin.

❏ 4. Cut to length and glue in the 3/32" x 3/8"

“ribs” where indicated on the plan.

❏ 5. Block sand the structure until it is flat.

❏ 6. Use medium CA to glue the left fin skin to all

the ribs, the LE and the TE.

❏ 7. Draw a centerline around the fin to assist you

in hinging and shaping. Shape the LE of the fin to
match the cross section on the plan.

BUILD THE ELEVATORS

❏

1. Place the 3/32" balsa die-cut elevators over
the plan. Mark the locations of the “ribs” on both
sides of both elevators.

❏ 2. From the grooved 1/2" x 1/2" x 30" balsa

control surface LE, cut two pieces to the length

shown on the plan.

❏ 3. Slide the elevators into the slot in the control

surface LE’s. Glue with CA.

8

❏ 4. Hang the LE’s over the edge of the table and

glue the 3/32" x 1/4" “ribs” (made from 3/32" x 1/4"

x 30" balsa) to the elevators at the locations
marked earlier.

❏ 5. Flip the elevators over onto their other side

and glue the “ribs” onto the second side.

❏ 6. Center the 3/32" die-cut balsa balance tabs

on the forward surfaces of the elevator LE’s. Glue
them in position as indicated by the plan.

❏ 7. Glue the elevator tip blocks (cut earlier) to the

end of the elevators.

❏ 8. Cut 2" balsa balance tab LE’s from 1/4" x

1/2" stock. Glue them to the front edge of the
elevator as shown on the plan.

❏ 9. Cut balance tab root cap strips from leftover

balsa 3/32" balsa. Glue them to the root end of the
balance tabs as shown on the plan. Glue a rib to
the balance tab (made from 3/32" x 1/4" x 30"
balsa) between the tip and the root cap strip.

❏ 10. Make doubler caps for the root end of each

elevator from leftover 1/8" balsa. Glue a cap to the
root end of each elevator. Make four torque rod
doublers (see plan for shape and location) from
leftover 3/32" balsa. Glue them to both sides of the
elevators in the locations shown on the plan.

❏ 11. Sand the tip of each elevator to match the

outline on the plan.

❏ 12. Use a bar sander to sand the ribs to match

the typical cross-section on the plan. Note that
there is some outward curvature to provide the
scale ribbed appearance.

❏ 13. Tape the elevators to the stab for blending

and shaping.

❏ 14. Remove the elevators and shape the LE to a

“V” as shown on the cross-section if you are using
the standard hinging technique. (See the Hinging
section and the plan sheets for alternatives.)

BUILD THE RUDDER

❏

1. Trim the grooved 1/2" x 1/2" balsa LE (left over

from the elevators) to the length shown on the plan.

Cut the balance tab LE from the 1/4" x 1/2" stock.

❏ 2. Join the 3/32" die-cut balsa rudder pieces,

rudder front and rudder back together with CA.

Mark the “rib” locations on both sides of the rudder.

❏ 3. Glue the rudder sheet into the slot in the

rudder LE.

❏ 4. Cut “ribs” from the 3/32" x 1/4" x 30" balsa

sticks and glue them to both sides of the rudder.

❏ 5. Glue the 1/4" x 1/2" balance tab LE to the

front edge of the rudder.

Photo for steps 1-6

❏ 6. Make doublers from leftover 3/32" sheet to

reinforce the area where the torque rod protrudes
into the rudder (see plan for location).

❏ 7. Shape the rudder to match the photos and

the typical cross-section on the plan. Tape the
rudder to the fin for shaping.

❏ 8. Shape the LE to a “V” as shown on the

cross-section if you are using the standard
hinging technique.

9

BUILD THE WING

WING CENTER SECTION
NOTE: The center section main spar is made of one

die-cut 1/8" plywood piece sandwiched between two
die-cut 1/16" birch plywood pieces.

NOTE: The wing root ribs are stamped only with a
number (2 is R-2), the wing tip ribs are stamped
with T and a number (T 4 is T-4).

❏ 1. Lightly sand the surfaces of the three pieces

that make up the main spar to make sure they will
lie flat together for a good glue joint.

❏ 2. Make some short sticks from leftover 1/8"

balsa to key the rib slots together and assure
proper alignment during gluing. Test fit pieces.

❏ 3. Use 30-minute epoxy to glue the spar pieces

together. Use weights to hold them flat on the

table while the glue cures. Apply thin CA on the

edges of the spar, especially to areas that do not

appear to be well glued.

❏ 4. Clean up the edges of the spar with

sandpaper. If you will be installing retracts, you
may want to cut any holes required for your
retracts in the spar at this time. See the
instructions that came with your retracts.

❏ 5. Join the die-cut 3/16" balsa aft leading edge

pieces at the center over the template provided on
the plan. Use the plan to mark the rib locations on

the aft LE. Glue the die-cut 3/16" balsa fwd
leading edge pieces to the aft leading edge.

(Center the fwd leading edge on the aft leading

edge as shown on the cross-sectional view.) Refer

to the photo - do not put glue where indicated.

❏ 6. Join the die-cut 3/16" balsa fwd trailing edge

pieces at the center over the template provided on
the plan. Use the plan to mark the rib locations on

the fwd TE. Glue the die-cut 3/16" balsa aft trailing
edge pieces to the fwd trailing edge. (Center the aft

trailing edge on the fwd trailing edge as shown on
the cross-sectional view.)

❏ 7. The hatched area of the forward LE which was

not glued may be cut loose with a razor saw and
removed after the glue has set on the rest of the part.

❏ 8. Drill 3/16" holes through all ribs and doublers

that require them for aileron linkage routing. These
holes are located by punch marks in the ribs just
aft of the spar.

❏ 9. Glue the die-cut 1/16" plywood R-2B rib

doublers to the die-cut 3/32" balsa R-2 ribs. Glue
the plywood R-3B rib doublers to the balsa R-3
ribs. Be sure to make a left and a right of each
assembly. Trial fit the R-3 assembly into the spar

slot – you may find it necessary to bevel the
plywood doubler along the top side a little for a
smooth transition.

❏ 10. Glue the die-cut 1/8" balsa R-4B sub ribs to

the die-cut 1/8" balsa R-4 ribs. Glue the R-5B sub
ribs to the R-5 ribs. Be sure to make a left and a
right of each assembly.

10

❏ 11. Plug the die-cut ribs R-1 to R-6 into the

spar. Hold this assembly over the plan to make
sure the ribs are perpendicular to the spar and not
skewed. When you are satisfied that all ribs are
fitting properly, lightly glue them in place with a
drop of CA. You will glue all these joints thoroughly
after the LE, TE and a few other parts are installed.

❏ 12. Make a couple of 1/2" tall balsa blocks to

support the ends of the R-1’s and prevent the center
section from twisting. Tack glue these to the R-1’s.

❏ 13. Slide the die-cut balsa well doublers (WD)

into place - do not glue yet.

❏ 14. Glue the TE assembly in place. Check the

center section on a flat table to be sure it is not
twisted. Flex and reglue joints to take out any warps.

❏ 15. Align the LE assembly onto the front edge

of the wing. Glue only to ribs R-1, R-2 and R-3.

❏ 16. Glue the die-cut 3/16" balsa LE triplers in

place between R-3 and R-5. Glue ribs R-4 and R-5
to the LE.

❏ 17. Glue both 1/8" die-cut plywood dowel

plates (DP and ADP) in place as shown on plan.

Glue the R-6’s to the LE. Drill a hole through the
LE of the wing through the hole in the forward
dowel plate (DP). Start with a small drill and
gradually increase the size to 5/16".

❏ 18. If you are using retracts, glue in the die-cut

1/16" plywood spar doublers (SD) on both sides

of the spar using 30-minute epoxy. Cut a notch in

the main spar to match the strut cutout in (SD).
The notch will probably need to be deepened

slightly during final retract fitting. Keep this cut

smoothly radiused to prevent the creation of a
weak spot in the wing. A small Dremel

®

drum
sander is helpful here. See Page 42 for details on
retract installation.

19. If you are using fixed landing gear, assemble
both sets of fixed gear parts with 30-minute epoxy
as follows:

❏ A. Drill the holes in the 1/8" x 1-13/16" x 3"

5-ply plates using the pattern on the wing plan.

❏ B. Glue each basswood 7/16" x 5/8" x 7/8"

landing gear retainer block to a grooved bass
landing gear mount.

❏ C. Refering to the drawing on the wing plan, drill

a 5/32" hole where shown into each Grooved LG
mount and through each LG retainer block.

❏ D. Slide a 1/8" plywood plate onto each main

landing gear wire. Trial fit the LG block assemblies,
relieve any parts if necessary to allow the 1/8" plates
and the block assemblies to almost come together
(a little pressure during final assembly is good).

NOTE: The wire Landing Gear in the kit differs in

appearance from the wire LG in the photos.

❏ E. Drill the four 5/64" holes shown in each

basswood block assembly for the #4 x 1/2" sheet
metal screws, using the 1/8" plate as a pattern.

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❏ F. Disassemble the parts and enlarge the hole

drilled in the previous step in the 1/8" plate to 1/8"
for clearance.

❏ G. Reassemble the fixed gear parts.

❏ 20. Measure and drill the gear mounting holes in

the 1/4" x 5/16" x 3" plywood mounting rails.

Mount the fixed gear plates or retracts – test fit
between R-2B and R-3B while holding the 1/16"

die-cut plywood R-3C gear reinforcement tripler in

place (if you are using retracts, make sure the
retract will clear the wing skins). Adjust the height of
R-3C if necessary. Do this for both wing panels.

❏ 21. Glue the R-3C’s in position.

❏ 22. Tilt the LG assemblies (fixed or retract) until

the struts protrude straight down (the left and right
struts should be parallel to each other and
perpendicular to the ground). Check the fit of the
R-2C’s, adjust their height if necessary, then glue
them in place. Glue in the mounting rails.

❏ 23. Remove the LG assemblies and apply a

small fillet of 30-minute epoxy to all joints involving
plywood in the landing gear mounting areas. Apply
some epoxy to the dowel plate joints also.

❏ 24. Glue all ribs to the spar. Glue both WD’s to

ribs R-1, R-2, R-3 and R-4. Reinforce any glue

joints that appear weak.

TIP PANELS

NOTE: The tip panels are built “UPSIDE-DOWN”
on the plan (the jig tabs are attached to what is,
in the end, the TOP surface of the wing.)

❏❏1. Place the tip panel plan over a flat building

board (you may wish to cut out these sections of the
plan sheet). Cover with waxed paper.

❏❏2. Cut the top 1/4" x 3/8" x 20" hard balsa

spar to length. Pin it in place over the plan.

❏❏3. Cut a 1/16" slot in the 3/32" balsa die-cut

ribs T-4 and T-5 between the punch marks

provided to allow the bellcrank platform to slide in
place later.

❏❏4. Glue die-cut 3/32" balsa ribs T-1 through

T-7 to the spar with the jig tabs at the TE flat

against the work surface.

❏❏5. Cut a V-notch in the bottom 1/4" x 3/8" x 20"

balsa spar so it can bend at T-6. Slide the bottom
spar into place. It will be glued in step 8.

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❏❏6. Notch the inner end of the shaped LE and

TE stock to match the plan.

❏❏7. Glue the TE to the ribs. Notice that T-7 is

glued flush with the top (toward plan) edge of the TE.

❏❏8. With the wing slightly weighted down so

the entire top spar and all the jig tabs rest on the
building board, apply glue to all joints involving the
bottom spar. Make sure the bottom spar is
securely glued at T-6 where it is notched.

❏❏9. Glue the LE to the ribs, centering it on all

ribs except T-7. T-7 is glued flush with top edge
(toward plan) of the LE.

❏❏10. Draw lines with a pen and a straight

edge as shown in the photos to mark the tapering
of the bottom of the LE and TE. Use a knife and a
sanding block to carefully taper the LE and TE.

❏❏11. Assemble the bellcrank parts onto the

die-cut 1/16" ply support – make a left and a right.

Be sure to put a drop of 6-minute epoxy on the
thread and nut of the 4-40 bolt to prevent it from
vibrating loose.

❏❏12. Glue the bellcrank assembly securely in

place through the slots in ribs T-4 and T-5.

❏❏13. Cut a 1/16" x 3/8" slot in the top and

bottom of T-1 so the 1/16" plywood spar joiners
can pass through the rib and overlap the main spar
when the panels are joined.

REPEAT THE WING TIP PANEL STEPS 1-13 TO
BUILD THE OPPOSITE PANEL. BE SURE TO
MAKE A LEFT AND A RIGHT TIP PANEL.

WING JOINING

❏

1. Trim off all tip panel jig tabs except the tabs

on the T-7’s.

❏ 2. Sand the center section LE and TE (using a

block or sanding bar where possible) to approximate

the shape of the outer panel LE and TE. Be careful

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not to alter the shape of the ribs during this process
(masking tape can be used to help protect them).
Final shaping can be done after wing joining.

❏ 3. Trim the tip panel top and bottom spars so

they protrude 11/16" past T-1.

❏ 4. Notch the front of the center section LE to

accept the tip panel LE. Notch the back of the
center section TE to accept the tip panel TE.

❏ 5. Make any small adjustments necessary to

allow you to mate the tip panel with the center
section. Use a small ruler to check that ribs R-1
and T-1 can be positioned parallel and 11/16"
apart. Adjust if necessary to obtain a good fit.

NOTE: The 3/8" wide tip spar should be
centered over the 1/4" wide center spar.

❏ 6. Place the wing upside down on a flat table

with the balsa 5/8" x 2" x 6" dihedral jig block under
the center section. This sets the proper dihedral
when the tips are on the table surface.

❏ 7. Apply small weights to the tips of the wing. The

T-7 jig tabs and the spar tips should contact the table.
Adjust the LE and TE junctions of the tip and center
sections to align them and relieve any stresses.

❏ 8. Check again to see that R-1 and T-1

are parallel.

❏ 9. Tack glue the TE and spar joints with CA.

❏ 10. Carefully remove the tip weights and look at

the entire wing. Make sure there are no twists in
the wing. If there are any problems, pop loose the
wing joints and realign them.

❏ 11. Replace the wing tip weights and apply

30-minute epoxy to all joints involved. Use
30-minute epoxy to glue the die-cut 1/16" ply spar
joiners in place before the glue cures.

WING STRUCTURE COMPLETION

❏❏

1. Cut a piece of the outer pushrod guide
tube to 18". Roughen the outside of it with coarse
sandpaper. Carefully slide it in place through the
wing ribs. Glue it to all ribs it touches.

❏❏2. Cut a 20" piece of inner pushrod tube and

screw a 1" piece of threaded rod and a nylon clevis
into one end.

❏❏3. Use a sharp knife to cut a 5/16" sq.

window in T-4 where the pushrod passes through.
This will allow the pushrod to move slightly as the
bellcrank rotates.

❏❏4. Slide the inner pushrod tube into place

and connect the clevis to the bellcrank.

REPEAT STEPS 1-4 FOR THE OTHER SIDE OF
THE WING

❏ 5. If you have your aileron servo available it is

easiest to install it now. This will allow you to
confidently zero the bellcranks when the servo is in
its centered position. See plan for proper location
and mounting of the aileron servo. The aileron
servo is mounted on 3/16" x 3/8" plywood rails.

NOTE: The servo may protrude about 5/16" below the

bottom of R-6 into the belly-pan if necessary.

Skip steps 6 to 8 if you are using standard
sport ailerons and no flaps.

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