Hangar 9 P-47 thunderbolt User manual

Wingspan: .......................... 65” / 165.1 cm
Wing area: .......................... 727.5 sq in / 4693.5 sq cm
Fuselage length: ................. 51.18” / 130 cm
ASSEMBLY MANUAL
P-47 Thunderbolt
Weight: .............................. 8–9 lbs (3.5–4.1 kg)
Recommended engine: ........ .60–1.00 2-stroke
........ .72–1.00 4-stroke
Radio: ................................ 5-channel w/6 servos
Specifications



2
Contents of Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Required Radio and Engine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Additional Required Tools and Adhesives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Covering Colors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Before Starting Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Using the Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Section 1: Joining the Wing Halves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Section 2: Attaching the Wing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Section 3: Installing the Horizontal Stabilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Section 4: Installing the Vertical Stabilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Section 5: Installing the Ailerons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Section 6: Installing the Elevators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Section 7: Rudder Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Section 8: Retract Linkage Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Section 9: Four-Stroke Engine Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Section 10: Two-Stroke Engine Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Section 11: Fuel Tank Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Section 12: Radio Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Section 13: Linkage Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Section 14: Cowling Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Section 15: Canopy and Decal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Adjusting the Engine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Preflight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Control Throws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Recommended CG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Range Testing the Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
2005 Official AMA National Model Aircraft Safety Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Table of Contents

3
Large Parts:
A. Wing Set HAN2976
B. Fuselage HAN2977
C. Tail Set HAN2978
D. Painted Canopy HAN2981
E. Cowling HAN2979
F. Fiberglass Belly Pan HAN2985
Radio Equipment
• 5-channel radio system (minimum)
• 5 standard servos (JRPS537 recommended
or equivalent)
• Low-Profile Retract Servo (JRPS791)
• 12" Servo Extension (JRPA098) (2)
• 18" Servo Extension (JRPA099) (2)
• Large Servo Arms w/Screw (JRPA212)
• Radio Switch (JRPA003)
• 900mAh receiver battery (minimum)
Recommended Engines
• .61 2-stroke
• 1.00 4-stroke
Recommended JR® Systems
• XF421EX
• XP6102
• XP662
• X-378
• XP9303
• 10X
Small Parts:
1. 31/4" Wheels HAN2385
2. Fuel Tank HAN1987
3. Engine Mount HAN2033
4. Tailwheel Assembly HAN2980
Items Not Shown:
Plastic Wheel Wells HAN2984
P-47 Mechanical Retracts HAN2983
Decal Set HAN2987
Pushrod Set HAN2986
Cockpit Detail HAN2982
JR XF631
Evolution .61NT
EVOE0610
Saito 1.00 FA-AAC
SAIE100 JR XP9303
A
B
C
E
D
F
Contents of Kit
Required Radio and Engine

4
Tools
• Hobby scissors
• Drill
• Drill bits: 1/16", 5/64", 3/32", 1/8", 9/64",
5/32", 1/4"
• Felt-tipped pen
• Flat blade screwdriver
• Foam: 1/4"
• Hex wrench: 9/64", 3/16"
• Hobby knife
• Phillips screwdriver (small)
• Pliers
• Sandpaper
• Socket wrench: 11/32"
• Square
• T-pins
Adhesives
• 6-Minute Epoxy (HAN8000)
• 30-Minute Epoxy (HAN8002)
• Thin CA (PAAPT07)
• Medium CA (PAAPT01)
• CA Remover/Debonder (PAAPT16)
• Masking Tape (MMM20901)
• Canopy glue (Formula 560)
Other Required Items
• Epoxy Brushes (DUB345)
• Fuel tubing
• Mixing Sticks for Epoxy (DUB346)
• Paper towels
• Rotary tool w/sanding drum
• Rubbing alcohol
• Ruler
• String
• Wax paper
An RC aircraft is not a toy! If misused, it can cause serious bodily harm and damage to property. Fly only in open areas,
preferably at AMA (Academy of Model Aeronautics) approved flying sites, following all instructions included with your
radio and engine.
• Black HANU870
• White HANU874
• Silver HANU881
Additional Required Tools and Adhesives
Warning
Covering Colors

5
Before beginning the assembly of the P-47, remove each part from its bag for inspection. Closely inspect the
fuselage, wing panels, rudder, and stabilizer for damage. If you find any damaged or missing parts, contact the place
of purchase.
If you find any wrinkles in the covering, use a heat gun or covering iron to remove them. Use caution while working
around areas where the colors overlap to prevent separating the colors.
This manual is divided into sections to help make assembly easier to understand and to provide breaks between
each major section. In addition, check boxes have been placed next to each step to keep track of them as they’re
completed. Steps with two boxes indicate that the step will require repeating, such as for a right or left wing panel,
two servos, etc. Remember to take your time and follow the directions.
Horizon Hobby, Inc. guarantees this kit to be free from defects in both material and workmanship at the date of
purchase. This warranty does not cover any parts damaged by use or modification. In no case shall Horizon Hobby’s
liability exceed the original cost of the purchased kit. Further, Horizon Hobby reserves the right to change or modify
this warranty without notice.
In that Horizon Hobby has no control over the final assembly or material used for the final assembly, no liability
shall be assumed nor accepted for any damage of the final user-assembled product. By the act of using the product,
the user accepts all resulting liability.
Once assembly of the model has been started, you must contact Horizon Hobby, Inc. directly regarding any warranty
question that you have. Please do not contact your local hobby shop regarding warranty issues, even if that is where
you purchased it. This will enable Horizon to better answer your questions and provide service in the event that you
may need any assistance.
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.
Horizon Hobby Service Department
4105 Fieldstone Road
Champaign, Illinois 61822
[phone]
horizonhobby.com
HAN100 – Heat Gun
HAN150 – Covering Glove
HAN101 – Covering Iron
HAN141 – Sealing Iron
Sock
Before Starting Assembly
Using the Manual
Warranty Information

6
Required Parts
• Left and right wing panels • Center wing panel
• Wing joiner • Wing dowels (2)
Required Tools and Adhesives
• Masking tape • 30-minute epoxy
• Epoxy brush • Mixing stick
• Rubbing alcohol • Paper towels
 Step 1
Draw a centerline on the wing joiner as shown.
 Step 2
Test the fit of the wing joiner into one of the wing panels.
The joiner should slide into the panel with little resistance
up to the line drawn on the joiner. Lightly sand the joiner
as necessary to achieve a proper fit.
Note: The joiner will be angled towards the
top of the wing.
 Step 3
Test the fit of the wing joiner into the remaining wing
panel. The joiner should again slide into the panel with
little resistance up to the line drawn on the joiner. Lightly
sand the joiner as necessary to achieve a proper fit.
 Step 4
Remove the covering in the leading edge for the wing
dowels. Locate a 1/4" x 1 3/16" wing dowel. Use
30-minute epoxy to glue the wing dowels into the wing
panels. The dowels should be inserted so 3/8" of the
dowel is left exposed in front of the leading edge. Repeat
for both wing dowels.
 Step 5
Without using any glue, test fit the wing panels together
using the wing joiner. The panels must fit together without
any gaps top or bottom. If any gaps do exist, use a
sanding bar to lightly sand the root ribs of both panels
until the panels fit together perfectly.
Section 1: Joining the Wing Halves

7
Note: Read through the remaining steps of
this section before mixing any epoxy.
Hint: It is extremely important to use plenty
of epoxy when joining the wing panels. It will
also be helpful to use wax paper under the
wing joint to avoid gluing the wing to your
work surface.
 Step 6
Mix approximately 1 ounce of 30-minute epoxy. Using
an epoxy brush, apply a generous amount of epoxy to the
wing joiner cavity of one of the wing panels.
 Step 7
Completely coat half of the wing joiner with epoxy. Be sure
to apply epoxy to the top and bottom of the joiner also.
Insert the epoxy-coated side of the joiner into the wing
joiner cavity up to the mark on the joiner. If you have used
enough epoxy, it will ooze out of the cavity as the joiner is
installed. Remove any excess epoxy using a paper towel
and rubbing alcohol.
 Step 8
Apply epoxy to the exposed portion of the wing joiner and
to both root wing ribs of both panels.
Section 1: Joining the Wing Halves

8
 Step 9
Carefully slide the wing panels together. Apply enough
pressure to firmly seat the two wing panels together,
causing any excess epoxy to ooze out from between the
panels. Use rubbing alcohol and a paper towel to remove
the excess epoxy. Check to make sure there are no visible
gaps between the panels. Use masking tape to securely
hold the wing panels together. Allow the epoxy to fully
cure before continuing to the next section.
 Step 10
Center the wing bolt plate on the bottom of the wing and
trace the placement of the plate onto the wing using a
felt-tipped pen.
 Step 11
Remove the covering 1/16" inside the line drawn using a
sharp hobby knife. Remove the lines from the wing using
rubbing alcohol and a paper towel. Use medium CA to
glue the plate in position.
 Step 12
Use a 1/4" drill bit and drill through the place for the
wing bolts.
Section 1: Joining the Wing Halves

9
Required Parts
• Assembled wing • Fuselage
• 1/4-20 blind nut (2) • 1/4" washer (2)
• 1/4-20 x 1 1/2" socket head bolt (2)
• Fiberglass wing fairing
Required Tools and Adhesives
• 30-minute epoxy • Pliers
• Hex wrench: 3/16"
 Step 1
Locate the two 1/4-20 blind nuts. Mix a small amount of
30-minute epoxy and apply it to the barbs of the blind nut.
Use pliers or a C-clamp to install the blind nut from the
inside of the fuselage.
Note: Make sure no epoxy gets into the
threads of the blind nut.
 Step 2
Use the two 1/4 x 1 1/2" socket head bolts and
1/4" washers to attach the wing to the fuselage.
 Step 3
Measure the distance between a point centered at the
rear of the fuselage and each wing tip. The measurement
will be equal if the wing is aligned correctly. If the
measurement is not the same, slightly oval the hole for the
wing bolts until an equal measurement is achieved.
A A
A=A
 Step 4
Position the fiberglass wing fairing onto the wing. Trace
around the fairing using a felt-tipped pen.
Section 2: Attaching the Wing

10
 Step 5
Remove a strip of covering that is 1/8" wide inside the
lines drawn in the previous step. Use care not to
cut into the underlying wood, weakening the
wing structure.
 Step 6
Use 30-minute epoxy to glue the fairing to the wing. Use
a covering iron to apply the trim covering along the joint
between the wing fairing and the wing.
Required Parts
• Assembled wing • Fuselage
• Stabilizer • Elevator joiner wire
• 1/4-20 x 2" wing bolt (2)
Required Tools and Adhesives
• Hobby knife • Felt-tipped pen
• Ruler
 Step 1
Slide the stab into the fuselage, making sure the
stabilizer is as far forward as possible. Center the stab
in the opening by measuring the distance from the
fuselage to each tip. The stab is aligned when both
measurements are identical.
 Step 2
Check the distance from each stab tip to a center point at
the firewall. These measurements must be equal for the
stab to be aligned.
Section 2: Attaching the Wing
Section 3: Installing the Horizontal Stabilizer

11
 Step 3
Check to make sure the wing and stabilizer are parallel.
If they are not, lightly sand the opening in the fuselage
for the stab until the stab is parallel to the wing.
A A
A=A
 Step 4
After verifying the alignment of the stabilizer, use a felt-
tipped pen to trace the outline of the fuselage on the stab.
 Step 5
Remove the stab and use a hobby knife with a new blade
to remove the covering 1/16" inside the lines just drawn.
Use rubbing alcohol and a paper towel to remove the
lines once they are no longer needed.
Note: Use care not to cut into the underlying
wood and weaken the structure. Doing so
could cause the stab to fail in flight, resulting
in the loss of your airplane.
 Step 6
Slide the elevator joiner wire into the slot for the stabilizer.
Slide the stabilizer partially back into the slot.
 Step 7
Mix 1/2 ounce of 30-minute epoxy. Apply epoxy to the top
and bottom of the exposed wood of the stabilizer. Slide the
stabilizer the rest of the way into the slot in the fuselage.
Double-check the alignment to verify it’s correct. Remove
any excess epoxy using a paper towel and rubbing
alcohol. Allow the epoxy to fully cure before continuing.
Section 3: Installing the Horizontal Stabilizer

12
Required Parts
• Fuselage assembly • Fin
• Tail wheel wire • Steering control arm
• Tail wheel wire support bracket
Required Tools and Adhesives
• 30-minute epoxy • 6-minute epoxy
• Square • Hobby knife
• Pliers • Ruler
 Step 1
Remove the covering from the fuselage for the vertical fin.
Test fit the fin to the fuselage. Slide the fin as far back in
the slot as possible. Trace the outline of the fuselage onto
the fin using a felt-tipped pen. Trace the outline of the
dorsal fin onto the top of the fuselage as well.
 Step 2
Remove the fin and use a hobby knife with a new blade
to remove the covering 1/16" below the lines just
drawn. Use rubbing alcohol and a paper towel to remove
the lines once they are no longer needed. Remove the
covering from the bottom of the dorsal fin and the top
of the fuselage.
Note: Use care not to cut into the underlying
wood and weaken the structure. Doing so
could cause the fin to fail in flight, resulting in
the loss of your airplane.
Section 4: Installing the Vertical Stabilizer

13
 Step 3
Slide the fin back into the fuselage. Check the alignment
of the fin to the stabilizer using a square. The fin must be
90 degrees to the stabilizer when properly aligned.
If not, carefully sand the bottom of the fin to provide the
clearance to align the fin.
 Step 4
Mix 1/2 ounce of 30-minute epoxy. Apply the epoxy to
both the exposed wood on the fin and the slot in the
fuselage. Use care not to get epoxy on the elevator joiner
wire. Insert the fin and use tape to hold the fin in position
until the epoxy fully cures.
Note: Check the alignment of the fin
periodically to make sure it isn’t moving while
the epoxy cures.
Section 4: Installing the Vertical Stabilizer

14
Required Parts
• Wing • Aileron (left and right)
• CA hinges (6)
Required Tools and Adhesives
• Thin CA • T-pins
  Step 1
Remove the aileron from the wing. Place a T-pin in the
center of each hinge.
  Step 2
Place the hinges in the precut slots in the aileron. The
T-pin will rest against the leading edge of the aileron when
installed correctly.
  Step 3
Slide the aileron and wing together. The gap between
the leading edge of the aileron and wing should be a
maximum of approximately 1/64". Check to make sure the
gap, at both ends of the aileron, is equal and the aileron
can move without rubbing on the wing.
Note: Do not use CA accelerator during the
hinging process. The CA must be allowed to
soak into the hinge to provide the best bond.
Using accelerator will not provide enough time
for this process.
  Step 4
Remove the T-pins and move the aileron to provide the
best access to the hinge. Apply thin CA to each hinge.
Make sure the hinge is fully saturated with CA. Use a
paper towel and CA remover/debonder to clean up any
excess CA from the wing and/or aileron. Make sure to
apply CA to both sides of the hinges.
Section 5: Installing the Ailerons

15
  Step 5
Firmly grasp the wing and aileron and gently pull on the
aileron to ensure the hinges are secure and cannot be
pulled apart. Use caution when gripping the wing and
aileron to avoid crushing the structure.
  Step 6
Work the aileron up and down several times to work in the
hinges and check for proper movement.
 Step 7
Repeat Steps 1 through 6 for the remaining aileron.
Section 5: Installing the Ailerons

16
Required Parts
• Fuselage assembly • Elevator (left and right)
• Elevator joiner wire • CA hinge (6)
Required Tools and Adhesives
• Thin CA • T-pins
• 30-minute epoxy • Medium sandpaper
• Drill • Drill bit: 9/64"
  Step 1
Locate three CA hinges. Place a T-pin in the center of the
hinges. Place the hinges into the elevator half.
  Step 2
Test fit the elevator and stab together. The elevator joiner
wire will be inserted into the hole drilled in the elevator.
  Step 3
Mix 1/2 ounce of 30-minute epoxy and apply it to the
groove and hole in the elevator half. Insert the elevator
joiner wire. Remove any excess epoxy using rubbing
alcohol and a paper towel.
Note: You can combine the previous step with
the following step if you like. This will hold the
elevator in position while the epoxy cures.
  Step 4
Check to make sure the elevator moves freely. Check
to make sure the hinge gap between the elevator and
stabilizer is roughly 1/64". Apply thin CA to both sides of
the hinge. Make sure to saturate the hinge and don’t use
accelerator.
  Step 5
Once the CA and epoxy have fully cured, gently pull
on the elevator and stab to make sure the hinges are
well glued. Flex the elevators a few times to break-in the
hinges following the same procedure as the
aileron installation.
 Step 6
Repeat Steps 1 through 5 to install the remaining
elevator half.
Section 6: Installing the Elevators

17
Required Parts
• Fuselage assembly • Rudder
• Tail wheel assembly • Tail wheel bracket
• #2 x 3/8" sheet metal screw (2)
Required Tools and Adhesives
• 6-minute epoxy • Drill
• Drill bit: 1/8" • Thin CA
• T-pins
 Step 1
Roughen the tail gear wire using medium grit sandpaper
where it will enter the rudder. Use 6-minute epoxy to glue
the wire into the rudder.
 Step 2
Locate three CA hinges. Place a T-pin in the center of the
hinges. Place the hinges into the rudder. Slide the hinges
and rudder into position. Check that the gap between the
rudder and fin is roughly 1/64". Apply thin CA to both
sides of the hinges. Perform the pull test after the CA has
fully cured.
 Step 3
Secure the tail wheel bracket to the fuselage using two
#2 x 3/8" sheet metal screws.
 Step 4
Slide the wheel collar against the tail wheel bracket and
tighten the setscrew.
Section 7: Rudder Installation

18
Required Parts
• Quick connector (2)
• Quick connector washer (2)
• Quick connector retainer (2) • 3mm setscrew (2)
• Retract servo tray mount (2) • Retract servo tray
• 3 1/4" main wheel (2) • 5/32" wheel collar (2)
• 3mm setscrew (4)
• 8 7/8" unthreaded retract wire (2)
Required Tools and Adhesives
• 6-minute epoxy • Thick CA
• Retract Servo (JRPS703) • Hobby knife
• Drill • Drill bit: 1/16", 5/64"
• Hex wrench (included in kit)
 Step 1
Notes regarding the retracts:
The included mechanical retracts may require some
adjustment after about 30 minutes of flight to keep them
in the best working order. The following clarifies the
operation of the retract, as well as how to make future
adjustments to keep your retracts working as well as they
did when new.
Installation
When installing the linkage, make sure the actuator rod is
moving to the full up and down positions without binding
the servo. Increase the throw by moving the linkage
outward on the servo arm. Decrease the throw by moving
the linkage inward on the servo arm.
If the servo is binding, it will add extra current draw to
the receiver battery and will greatly reduce flight times.
Change the location of the linkage at the servo arm inward
slightly to eliminate binding.
After flying for around 30 flights, you may notice that the
retracts will begin to have a little play. This is normal and
can easily be adjusted out. There are two setscrews to
adjust the up and down stops for these retracts.
Adjustments
Adjust the retract down stop by screwing the setscrew
in slightly. It will only take a small amount, so start
by turning it around 1/16 of a turn. If the setscrew is
tightened too much, the retract can bind and stall the
servo, placing unnecessary current loads on the
receiver battery.
The adjustment procedure is common after about
30 flights, depending on your runway surface. Check the
operation of your retracts often to keep them in the best
working order. Keep this section handy for future reference
for your P-47 Thunderbolt retracts.
 Step 2
Use 6-minute epoxy to glue the two retract servo tray
mounts into the wing as shown. They will rest flush with
the wing sheeting on the inside of the wing.
Section 8: Retract Linkage Installation

19
 Step 3
Locate the retract servo tray. Use 6-minute epoxy to glue
the servo tray into position.
 Step 4
Install a low profile retract servo in the servo tray using
the hardware provided with the servo. Prevent splitting
the servo tray by drilling 1/16" holes for the servo
mounting screws.
 Step 5
Select a servo arm from those included with your servo
that has a distance of 7/8" to 1" between equally spaced
holes as shown to start with.
 Step 6
Use a 5/64" drill bit to drill the appropriate holes in
the arm. Attach two quick connectors to the servo arm
using quick connector washers and retainers.
 Step 7
Connect the retract servo to your radio system and
electronically move the servo to the retracted position.
Slide the retract control wires through the quick
connectors as shown and secure the servo arm to
the retract servo.
Section 8: Retract Linkage Installation

20
 Step 8
With the retract servo in the retracted position, push the
retract linkage to manually retract the landing gear. Install
3mm setscrews into the quick connectors and tighten
them to secure the retract linkage. Check the actuation
of the retracts, making sure they lock in both the up and
down positions. Make any necessary adjustments to the
linkages as necessary for proper operation of the retracts.
Hint: Adjustments and fine tuning can also
be made to the retract linkages from inside the
wheel wells.
Remember: It may take some time to get the
retracts adjusted so the servo does not stall
when the landing gear is up and extended.
  Step 9
Draw a centerline onto the back of one of the gear doors.
  Step 10
Locate two of the gear door brackets. Position the brackets
2 1/4" and 5" from the top of the door. Mark the locations
for the screws using a felt-tipped pen. Drill the locations
using a 1/8" drill bit.
  Step 11
Attach the gear doors using four 3mm x 10mm screws,
four 3mm lock nuts, eight 3mm washers and two gear
door brackets.
  Step 12
Install a wheel and two wheel collars on the main landing
gear. The order of items is 5/32" wheel collar, wheel, and
then another wheel collar. Secure the collars using the
3mm setscrews.
 Step 13
Repeat Steps 9 through 12 to complete the retract
installation.
Section 8: Retract Linkage Installation