Hangar 9 P-51D Mustang 40 ARF User manual

Specications
Wingspan: ......................................................... 58.25 in (1480mm)
Length: ................................................................ 50.4 in (1281mm)
Wing Area: ................................................626 sq in (40.39 sq dm)
Weight: ........................................................... 6.5–7 lb (2.9–3.2 kg)
Radio: ...............................................4- to 6-channel w/5-8 servos
Engine: ................................................ .40–.46 2-stroke, Power 46
P-51D Mustang Sport 40 ARF
Assembly Manual

2 Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Table of Contents
Contents of Kit and Parts Layout ...........................................2
Included Parts Listing............................................................3
Important Information Regarding Warranty...........................4
Recommended Setup.............................................................4
Transmitter Requirements......................................................4
Radio Equipment Requirements ........................................4–5
Optional Retracts ...................................................................5
Field Equipment Required......................................................5
Optional Field Equipment.......................................................5
Additional Required Tools......................................................5
Additional Required Adhesives ..............................................5
UltraCote Covering Colors .....................................................5
Using the Manual...................................................................5
Before Starting Assembly ......................................................5
Preparing the Fuselage for Electric Power .............................6
Installing the Main Radio System ..........................................6
Installing the Rudder and Elevator Pushrods.......................10
Installing the Tail Surfaces...................................................11
Installing the Glow Engine ...................................................13
Installing the Fuel Tank, Cowling and
Spinner for Glow Installations .......................................18
Installing the Electric Motor.................................................22
Installing the Cowling and Spinner for
Electric Motor Installations ............................................23
Installing the Pilot and Canopy ............................................25
Installing the Aileron Servos................................................25
Installing the Fixed Flaps .....................................................29
Installing the Optional Flap Servos ......................................30
Installing the Fixed Landing Gear.........................................34
OptionalInstalling the Retract Actuator ................................36
OptionalInstalling the Retract Mechanism ...........................42
Attaching the Wing ..............................................................45
Center of Gravity..................................................................46
Control Throws ....................................................................47
Safety Do’s and Don’ts for Pilots .........................................48
Flight Preparations...............................................................48
Daily Flight Checks...............................................................48
Flying Your P-51 Mustang ...................................................49
Maintaining Your P-51D Mustang........................................49
Glossary of Terms................................................................50
Age Requirements ...............................................................51
Safety, Precautions and Warnings .......................................51
Warranty Information...........................................................51
Compliance Information for the European Union.................52
2009 Official Academy of Model Aeronautics Safety Code ..53
Replacement Parts
1. HAN4426 Fuselage with Hatch and Canopy
2. HAN444002 Left Wing
3. HAN444003 Right Wing
4. HAN444004 Painted Cowl
5. HAN2830 Canopy with Painted Frame
6. HAN4435 Pilot Bust
7. HAN4429 Tail Set with Tail Wheel
8. HAN4437 Exhaust
9. HAN4438 31/2-inch (90mm) Wheels (pr)
10. HAN4432 Wing Tube
11. HAN4709 Tail Wheel
12. HAN444005 Fixed Landing Gear without Wheels
(Includes mounting blocks, not
shown)
Items not shown
HAN444010 Flap Stays
HAN4434 Pushrod Set
HAN4436 Decal Set
HAN40M Engine Mount
HAN2479 11 oz Fuel Tank
HAN444006 Retract Wood Trays and Templates
HAN444007 Landing Gear Doors, Left and Right
Contents of Kit and Parts Layout
1
2
10
7
3
4
5
6
11
7
9
912
12
8

3Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Included Parts Listing
PACKAGED IN KIT
Fuselage with hatch 1
Left wing with flap and aileron 1
Right wing with flap and aileron 1
Horizontal stabilizer with elevator 1
Vertical fin and rudder with tail wheel 1
Fin fairing block 1
Fiberglass cowl 1
Clear cowl template 1
Canopy 1
Anodized aluminum wing tube 1
Exhaust stack (left and right) ea. 1
11 oz fuel tank 1
Painted pilot 1
FUSELAGE
#2 x 3/8 silver self-tapping screw 4 cowl
#2 x 5/16 black self-tapping screw 4 exhaust
Receiver plywood cover 1
Fuel tank plywood brace 1
Foam cushion 5 receiver and receiver battery
4-40 x 5/8 socket head cap screw 2 fuel tank brace
#4 washer 2 fuel tank brace
#2 x 3/8 self-tapping screw 4 receiver cover
Hook and loop straps 2 EP battery
Throttle pushrod plywood support 1 4-stroke
Throttle pushrod housing 1 4-stroke
WINGS
Nylon clevis 4 ailerons and flaps
25/8inch (67mm) pushrod 2 aileron
3-inch (76mm) pushrod 2 flap
#2 x 5/16 black self-tapping screw 16 aileron and flap hatch
Wood servo blocks 8 aileron and flap servos
4-40 x 3/4 socket head cap screw 2 wing attachment
#4 flat washer 2 wing attachment
#4 lock washer 2 wing attachment
RUDDER & ELEVATOR
Nylon clevis 2 rudder and elevator
Safety tubing 2 rudder and elevator
231/4-inch (590mm) pushrod 1 elevator
26-inch (660mm) pushrod 1 rudder
ENGINE & MOTOR
Metal engine mount with hardware 1
Nylon clevis 1 throttle
Safety tubing 2 throttle
155/8-inch (397mm) pushrod 1 throttle
Brass pushrod connector with hardware 1 throttle
40mm EP standoff 4 EP motor
8-32 x 1/4 machine bolt 4 EP mounts
8-32 blind nut 4 EP mounts
#8 flat washer 4 EP mounts
#8 lock washer 4 EP mounts
LANDING GEAR
Fixed gear wire struts 2 landing gear
Fixed gear mounting block 2 landing gear
31/2-inch (90mm) main wheel 2 landing gear
6-32 x 1/2 socket head cap screw 8 landing gear
#6 flat washer 8 landing gear
Threadlock 1
Allen wrenches 2 landing gear
5mm wheel collar with setscrew 4 landing gear
#2 x 3/8 silver self-tapping screw 4 retract servo tray
Nylon clevis 1 retracts
11/4-inch (32mm) pushrod 1 retracts
Retract servo wood tray 1 retracts
Air cylinder support tray 1 retracts
Wood template 1 retracts
Gear door (left and right) 2
Wire tie 4 gear doors

4 Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Important Information
Regarding Warranty
Please read our Warranty and Liability Limitations section on
page 49 before building this product. If you as the purchaser
or user are not prepared to accept the liability associated
with the use of this Product, you are advised to return this
Product immediately in new and unused condition to the
place of purchase.
Recommended Setup–2-Stroke Glow
• Evolution®.46NX with Muffler (EVOE0461)
• Evolution Propeller 11 x 5 (EVO10050) or
10 x 6 (EVO11060)
• 23/4-inch 2-blade Spinner, Red (DUB292)
• Exhaust Diverter (DUB697) (Optional)
Recommended Setup–4-Stroke Glow
• Saito 82 (SAIE082aGK)
• 13 x 8 propeller (EVOE13080)
• 23/4-inch 2-blade Spinner, Red (DUB292)
Recommended Setup–
Electric Power (EP)
• E-flite®Power 46 BL Outrunner Motor (EFLM4046A)
• 60-Amp Pro Switch-Mode BEC Brushless ESC
(EFLA1060)
• Thunder Power 4S 3850–4500mAh Li-Po Battery Pack
• APC Propeller 13x6.5-inch (APC13065E) or
14x7 (APC14070E)
• 23/4-inch 2-blade Spinner, Red (DUB292)
Transmitter Requirements
The P-51D Mustang requires a minimum of a 6-channel
radio to operate all the functions of your aircraft. We suggest
the following radio systems available through Horizon Hobby
or your local hobby distributor.
Spektrum DX6i SPM6600
Spektrum DX7 SPM2710
JR Systems X9303 2.4GHz JRP2915
JR Systems 12X 2.4GHz JRP1200
Radio Equipment Requirements -
6-Channel Receiver
The following items are recommended when installing the
6-Channel AR6200 receiver (SPMAR6200) in your aircraft:
DS821 Digital Sport Servo (5–8) JRPS821
(Note: One less servo required for EP version)
3-inch Servo Extension (Retract) JSP98100
6-inch Servo Extension (ESC) JSP98020
9-inch Servo Extension (2) (Ailerons) JRPA097
Y-harness (2) JSP98020
Receiver Battery, 6-volt, 2700mAh JRPB5008
JR Chargeswitch JRPA004 or
JR Switch JRPA005
Ailerons: DS821 Servo (2)
• Y-harness (plugged into receiver)
• 9-inch Extension (connected to servo) (2)
Elevator: DS821 Servo
Rudder: DS821 Servo
Throttle: DS821 Servo
Note: ESC will require a 6-inch extension plugged
into the receiver
Optional Flaps: DS821 Servo (2)
• Y-harness (plugged into receiver)
Optional Retracts: DS821 Servo
• 3-inch Extension (plugged into receiver)
Note: Retracts can also use an MN48 servo
(JSP20040) when using the included plywood servo
adapter.
Radio Equipment Requirements -
7-Channel Receiver
The following items are recommended when installing the
7-Channel AR7000 receiver (SPM6070) in your aircraft:
DS821 Digital Sport Servo (5–8) JRPS821
(Note: One less servo required for EP version)
3-inch Servo Extension (Retract) JSP98100
6-inch Servo Extension (3) (ESC, Ailerons) JSP98020
9-inch Servo Extension (2) (Ailerons) JRPA097
Y-harness JSP98020
Receiver Battery, 6-volt, 2700mAh JRPB5008
JR Chargeswitch JRPA004 or
JR Switch JRPA005
Ailerons: DS821 Servo (2)
• 6-inch Extension (plugged into receiver) (2)
• 9-inch Extension (connected to servo) (2)
Elevator: DS821 Servo
Rudder: DS821 Servo
Throttle: DS821 Servo
Note: ESC will require a 6-inch extension plugged
into the receiver
Optional Flaps: DS821 Servo (2)
• Y-harness (plugged into receiver)
Optional Retracts: DS821 Servo
• 3-inch Extension (plugged into receiver)
Note: Retracts can also use an MN48 servo
(JSP20040) when using the included plywood servo
adapter.
The Spektrum trademark is used with permission
of Bachmann Industries, Inc.

5Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Radio Equipment Requirements -
9-Channel Receiver
The following items are recommended when installing the
9-Channel AR9000 receiver (SPMAR9000) in your aircraft:
DS821 Digital Sport Servo (5–8) JRPS821
(Note: One less servo required for EP version)
3-inch Servo Extension (Retract) JSP98100
6-inch Servo Extension (5) (ESC, Ailerons) JSP98020
9-inch Servo Extension (2) (Ailerons) JRPA097
Receiver Battery, 6-volt, 2700mAh JRPB5008
JR Chargeswitch JRPA004 or
JR Switch JRPA005
Ailerons: DS821 Servo (2)
• 6-inch Extension (plugged into receiver) (2)
• 9-inch Extension (connected to servo) (2)
Elevator: DS821 Servo
Rudder: DS821 Servo
Throttle: DS821 Servo
Note: ESC will require a 6-inch extension plugged
into the receiver
Optional Flaps: DS821 Servo (2)
• 6-inch Extension (plugged into receiver) (2)
Optional Retracts: DS821 Servo
• 3-inch Extension (plugged into receiver)
Note: Retracts can also use an MN48 servo
(JSP20040) when using the included plywood servo
adapter.
Optional Retracts
Robart Spring Down includes prebent struts and air
installation kit (HANP51)
23/4-inch (70mm) Main Wheels (HAN305)
Robart Air Pump (ROB164G)
DS821 Digital Sport Servo (JRPS821) or
MN48 Mini Servo (JSP20040)
Field Equipment Required
• Fuel (15% recommended)
• Long Reach Glow Plug Wrench (HAN2510)
• Metered Glow Driver with Ni-Cd & Charger (HAN7101)
• 2-Cycle Sport Plug (EVOGP1)
• Manual Fuel Pump (HAN118)
Optional Field Equipment
• Self-stick weights, 6 oz (HAN3626)
• PowerPro 12V Starter (HAN161)
• 12V 7Ah Sealed Battery (HAN102)
• Power Panel (HAN106)
• Blue Block After Run Oil (EVOX1001)
• Cleaner and towels
Additional Required Tools
Drill File
Pin vise Pliers
Ruler Hobby scissors
Side cutters Epoxy brushes
Felt-tipped pen Rotary tool
Sanding drum String/dental floss
Mixing sticks Mixing cups
Paper towels Rubbing alcohol
Covering iron Small clamps
Hook and loop tape Pencil
Hobby knife with #11 blade Medium grit sandpaper
Phillips screwdriver: #1, #2
Low-Tack Tape (MMM209034)
Box end or open end wrench: 12mm
Hex wrench or ball driver: 3/32-inch
Drill bit: 1/16-inch (1.5mm), 5/64-inch (2mm),
13/64-inch (5mm)
Additional Required Adhesives
Canopy Glue (PAAPT56)
Medium CA (PAAPT02)
Thin CA (PAAPT08)
Threadlock (PAAPT42)
30-Minute Epoxy, 8 oz (PAAPT39)
Hinge Glue (PAAPT55)
UltraCote® Covering Colors
• Black HANU874
• White HANU870
• Silver HANU881
• Cub Yellow HANU884
• True Red HANU866
• Olive Drab HANU904
Using the Manual
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 each step completed.
Steps with a single box () are performed once, while 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.
Before Starting Assembly
Before beginning the assembly of your model, 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.
HAN100 – Heat Gun
HAN150 – Covering Glove
HAN101 – Sealing Iron
HAN141 – Sealing Iron
Sock

6 Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Preparing the Fuselage for
Electric Power
Required Parts
Fuselage
Required Tools and Adhesives
Drill bit: 7/32-inch (5.5mm) Drill
Hobby knife with #11 blade
Rotary tool with sanding drum
Before beginning the assembly of your model you
should decide if you will be installing an electric or glow
power system. If you opt to install the electric system,
you will need to prepare the firewall at this time to
provide cooling for the speed control and battery, and
drill the holes for the blind nuts to mount the electric
motor.
Step 1
Use a drill and 7/32-inch (5.5mm) drill bit to drill the four
holes in the firewall for the blind nuts. The location has been
etched in the firewall.
Step 2
Use a hobby knife and rotary tool with a sanding drum to
remove the three areas on the firewall to allow cooling air to
pass into the fuselage for cooling.
Step 3
It may be necessary to remove the covering from the bottom
of the fuselage to allow cooling air to exit the fuselage when
using older batteries. If you are using the new Thunder
Power Generation 2 batteries or equivalent then the cooling
hole is not mandatory.
5-inch
(127mm)
3-inch
(76mm)
2-inch
(51mm)
Front of Fuselage
Installing the Main Radio System
Required Parts
Fuselage Foam: 1/4-inch (6mm)
Plywood receiver hatch Pre-cut foam (thin) (2)
Pre-cut foam (thick) (2) Pre-cut foam for receiver
Servo with hardware (2) (3 for glow engine installations)
Switch harness Receiver battery
#2 x 3/8-inch self-tapping screws (4)
Required Tools and Adhesives
Phillips screwdriver: #1 Thin CA
Hook and loop tape
Servo Extension Options
6-Channel receiver:
Y-harness (ailerons)
Y-harness (flaps)
3-inch (76mm) extension (retracts)
6-inch (152mm) extension (electronic speed control)
7-Channel receiver
6-inch (152mm) (2) (ailerons)
Y-harness (flaps)
3-inch (76mm) extension (retracts)
6-inch (152mm) extension (electronic speed control)
9-Channel receiver
6-inch (152mm) (2) (ailerons)
6-inch (152mm) (2) (flaps)
3-inch (76mm) extension (retracts)
6-inch (152mm) extension (electronic speed control)

7Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Step 1
Locate the items necessary to install the receiver battery and
receiver in the fuselage.
Step 2
Remove the canopy hatch from the fuselage by sliding the
hatch pin forward. Lift the hatch from the rear and slide
rearward to remove.
Hint: Place a drop of light oil in the hatch pin from the
inside of the canopy hatch so it will operate smoothly.
Step 3
Mount the switch to the side of the fuselage using the
hardware provided with the switch. Use a #1 Phillips
screwdriver to tighten the screws.
Step 4
Use a #1 Phillips screwdriver to thread one of the servo
mounting screws into the holes in the radio tray as shown.
This will cut threads in the plywood for the next step.
Step 5
Apply 2–3 drops of thin CA in each hole to harden the
threads. This and the previous step prepares the plywood
for the screws so they will have a lower chance of
vibrating loose.
Step 6
Prepare the rudder and elevator servos by removing the
stock servo horns from the servos using a #1 Phillips
screwdriver. Install the grommets and brass eyelets in the
servos according to the instructions provided with the
servos or your radio system.
Hint: If you are installing a glow engine, prepare a third
servo for use as the throttle servo.

8 Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Step 7
Secure the servos in the radio tray using the screws
provided with the servos. Tighten the screws using a #1
Phillips screwdriver. Orient the output of the rudder and
elevator servos as shown in the photo below.
Step 8
If you are installing a glow engine, install the throttle servo
at this time.
Step 9
Wrap the receiver battery in foam. Slide the receiver battery
into the fuselage under the fuel tank/battery tray. Make sure
the battery can not move by using more foam to secure its
position in the fuselage. Connect the lead from the battery to
the receiver at this time as well.
Step 10
Place the thicker piece of pre-cut foam included with your
model in the area for the receiver.
Step 11
Next, place the pre-cut foam with the opening for the
receiver in the receiver area.
Step 12
Plug the battery, rudder, elevator and throttle servo leads in
the appropriate ports of the receiver.
Note 1: If you are using a computer radio, you can mix
the ailerons (and flap channels) and use four 6-inch
(152mm) extensions plugged into the aileron, flap and
auxiliary ports of the receiver. If not, you can also use
two Y-harnesses (flap and aileron) at this time.
Note 2: If you are installing retracts, plug a 3-inch
(76mm) extension in the gear/retract port of the receiver.
Note 3: If you are building your model for use with
an electric power system, plug a 6-inch (152mm)
extension in the throttle port of the receiver.

9Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Step 13
Place the receiver in the opening in the foam. Make sure
the antennas on the receiver are straight to allow for the
best reception of radio signals. Tuck the servo leads neatly
in the fuselage.
Note 1: Some receivers may require the foam to be cut
to fit properly.
Note 2: If you are using a 2.4GHz radio system, it is
recommended to bind the receiver to the transmitter
at this time and check the operation of the servos that
are plugged into the receiver. Follow the instructions
provided with your radio for the procedure to bind the
receiver to the transmitter if necessary.
Step 14
Place the remaining pre-cut foam over the receiver to fill the
receiver area. The amount of foam will be dependant on your
choice of receiver.
Step 15
Secure the receiver hatch in place using four #2 x 3/8-inch
self-tapping screws and a #1 Phillips screwdriver. Note the
location of the blind nuts in the receiver hatch in the photo.
NOTE: SPECIAL CONSIDERATION
FOR ELECTRIC MODELS
EP Step A
When installing an electric power system you must install
the hook and loop straps that secure the motor battery. The
first strap is placed in the forward of the fuselage as shown.
EP Step B
The second strap is installed in the receiver hatch before it is
placed in the fuselage.
Step 16
Mount the remote receiver inside the fuselage using hook
and loop material. Note the direction of the antenna on
the receiver.

10 Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Installing the Rudder and Elevator
Pushrods
Required Parts
Fuselage assembly Clevis (2)
Clevis retrainer (2)
231/4-inch (590mm) elevator pushrod
26-inch (660mm) rudder pushrod
Servo horn, 180-degree (2)
Required Tools and Adhesives
Drill bit: 5/64-inch (2mm) Pin vise
Phillips screwdriver: #1 Side cutter
Step 1
Locate the items necessary to install the rudder and elevator
pushrods in your model.
 Step 2
Use a pin vise and 5/64-inch (2mm) drill bit to enlarge the
hole in the servo horn that is 5/8-inch (15mm) from the
center of the horn as shown.
 Step 3
Use side cutters to remove the remaining arm from the servo
horn so it doesn’t interfere with the operation of the servos.
 Step 4
Slide the 231/4-inch (590mm) elevator pushrod into the tube
in the fuselage.
 Step 5
Insert the bend in the pushrod wire through the hole in
the servo horn. With the radio on and the elevator servo
centered, secure the servo horn to the elevator servo using
the screw from the servo and a #1 Phillips screwdriver.

11Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Step 6
Repeat Steps 2 through 5 to install and connect the 26-inch
(660mm) rudder pushrod.
Step 7
Slide a clevis retainer on one of the nylon clevises.
Step 8
Thread the clevis 12-turns on the rudder pushrod. The exact
position of the clevis will be adjusted once the tail has been
bolted to the fuselage.
Step 9
Thread the clevis 12-turns on the elevator pushrod. The
exact position of the clevis will be adjusted once the tail has
been bolted to the fuselage.
Installing the Tail Surfaces
Required Parts
Fuselage assembly Stabilizer/elevator
Rudder/fin Fin fairing block
Required Tools and Adhesives
Nut driver: 7/32-inch or adjustable wrench
Ruler
Step 1
Remove the foam that protects the airframe from damage on
the rudder and elevator.

12 Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Step 2
Locate the rudder/fin assembly. Use a 7/32-inch nut driver to
remove the nuts and washers from the threaded rods on the
bottom of the fin. Slide the fuselage fairing on the bottom of
the fin as shown.
Note: The fuselage fairing is not glued in place. Make
sure to keep the fairing in position when installing the
stabilizer.
Step 3
Position the stabilizer/elevator assembly so the control
horn will face down, away from the fin. The threaded rods
from the rudder/fin assembly will slide into the two holes
in the stabilizer.
Step 4
Slide the stabilizer/fin assembly into position on the fuselage.
The stabilizer will rest tightly against the fuselage, and the fin
will rest snug against the top of the stabilizer.
Step 5
Place the washers then thread the nuts on the rods. Tighten
the nuts snugly against the bottom of the fuselage using a
nut driver or an adjustable wrench. Do not over-tighten the
nuts.

13Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Note: The nuts should be sufficiently tight enough
to not allow for rotation of the stab under slight
force. Avoid over-tightening the nuts and damaging
the fuselage.
Step 6
Connect the clevis to the center hole of the rudder control
horn. With the radio system on and the rudder servo
centered, use a straight edge to make sure the rudder is
aligned with the fin. Thread the clevis in or out until the
rudder and fin are aligned.
Step 7
Connect the clevis to the center hole of the elevator control
horn. With the radio system on and the elevator servo
centered, use a straight edge to make sure the elevator is
aligned with the stabilizer. Thread the clevis in or out until
the stabilizer and elevator are aligned.
Note: Once the rudder and elevator are adjusted, slide
the clevis retainer over the forks of the clevis so it does
not open accidentally.
Installing the Glow Engine
Required Parts
Fuselage assembly Engine mount
Engine mount strap (2) 8-32 locknut (4)
#8 washer (4) Clevis
Clevis retainer 3mm setscrew
Brass pushrod connector Connector backplate
Engine Servo horn, 180-degree
155/8-inch (397mm) throttle pushrod
8-32 x 3/4-inch machine screw (4)
8-32 x 1-inch machine screw (4)
Required Tools and Adhesives
Threadlock Phillips screwdriver: #2
Drill bit: 5/64-inch (2mm) Pin vise
Pliers Ruler
Side cutter
1.5mm hex wrench (included)
Step 1
Locate the items necessary to attach the engine to the fuselage.

14 Hangar 9 P-51D Mustang Sport 40 Assembly Manual
If you are installing a four-stroke in your model you will also
need to locate the following items.
Step 2
Cut the tip from the included threadlock vial. Slide a #8
washer on a 8-32 x 4/3-inch machine screw. Apply a drop of
threadlock on the threads of the screw. Prepare four screws
at this time.
Step 3
Attach the engine mount to the fuselage using the four
screws prepared in the previous step.
Step 4
Locate the engine mount straps. Note that one side is
smooth, while the other side has dimples. The smooth side
will face up and away from the engine when installed.
Step 5
Slide a 8-32 x 1-inch machine screw through the engine
mount strap from the smooth side. The screw then goes
through the rear hole of the engine mount. Thread a 8-32
locknut on the screw from the underside of the engine
mount. Install both engine mount straps at this time.
Step 6
Slide the engine into position. The engine mount straps will
be on the top of the engine mount lugs as shown.

15Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Step 7
Install an 8-32 x 1-inch machine screw through the
mount and engine mount rail at the front of the mount.
Thread an 8-32 locknut on the screw from the underneath of
the engine mount. Position the engine so the drive washer is
49/16 inches (116mm) forward of the firewall.
SPECIAL CONSIDERATION FOR
FOUR-STROKE INSTALLATION
Step A
You will need to drill the firewall to install the pushrod tube
for the four-stroke throttle linkage. Use a pencil to mark the
firewall in a location that aligns with the carburetor arm of
your engine.
Step B
Remove the engine from the mount and drill a 5/32-inch
(4mm) hole in the firewall at the mark made in the previous
step. Use medium grit sandpaper to roughen the ends of the
pushrod tube. Slide the pushrod tube into the hole so it is
flush with the firewall. Use medium CA to glue the pushrod
in position.
Step C
Cut the threaded end off the 155/8-inch (397mm) threaded
pushrod. Use Z-bend pliers to make a Z-bend in the end
where the threads were.
Step 8
Use a #2 Phillips screwdriver to tighten the screws evenly to
secure the engine in the mount.

16 Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Note: Skip Step 9 if you are installing a four-stroke
engine.
Step 9
Slide a clevis retainer on one of the nylon clevises.
Thread the clevis 12-turns on the 155/8-inch (397mm)
threaded pushrod.
Step 10
Slide the pushrod into the pushrod tube in the firewall.
Connect the clevis to the outer hole of the carburetor arm.
Slide the clevis retainer over the forks of the clevis to keep it
from opening accidentally.
NOTE: SPECIAL CONSIDERATION FOR
FOUR-STROKE INSTALLATION
Step 10a
Insert the Z-bend made in the throttle pushrod in the outside
hole of the carburetor arm. You may need to remove the
carburetor arm or engine to slide the pushrod wire into the
tube inside the fuselage.
Step 11
Use a pin vise and 5/64-inch (2mm) drill bit to enlarge the
hole in the servo horn that is 5/8-inch (15mm) from the
center of the horn as shown.
Step 12
Use side cutters to remove the remaining arm from the servo
horn so it doesn’t interfere with the operation of the servos.

17Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Step 13
Insert the brass pushrod connector in the hole made previously.
Step 14
Secure the pushrod connector using the nylon backplate.
Use pliers to press the backplate into position.
NOTE: SPECIAL CONSIDERATION FOR
FOUR-STROKE INSTALLATION
Step 14a
Slide the plywood pushrod guide on the throttle pushrod.
Position the guide so it is placed as shown in the photo. Do
not glue the guide at this time.
Step 15
Turn on the transmitter and receiver. Center the throttle stick
and trim. Install the servo horn parallel to the servo center line
as shown. This will provide equal travel from low to full throttle.
Step 16
Use the transmitter to move the servo to low throttle.
Close the carburetor on the engine and use a 3mm x 3mm
setscrew and 1.5mm hex wrench (included) to secure the
pushrod to the pushrod connector.
Step 17
Use the transmitter to check that the carburetor will fully
open. You may need to fine-tune the endpoints at the radio if
it doesn’t open fully, or if the servo binds at full throttle.

18 Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Installing the Fuel Tank, Cowling and
Spinner for Glow Installations
Required Parts
Fuselage assembly Fuel tank
Spinner assembly (optional) #4 washer (2)
Fuel tank stay Muffler
Cowling (painted) Cowling (clear)
4-40 x 5/8-inch socket head screw (2)
#2 x 3/8-inch self-tapping screw (8)
Exhaust stack (right and left)
Exhaust diverter (optional)
Required Tools and Adhesives
Drill bit: 5/64-inch (2mm) Pin vise
Phillips screwdriver: #1 Box wrench: 7/16-inch
Hex wrench: 3/32-inch, 7/64-inch
Step 1
Locate the items to install the cowl and fuel tank for your model.
Step 2
Inspect the fuel tank according to the following drawing to
determine the vent and clunk lines on the tank. The vent line
must face up when installing the tank or the engine will not
operate properly.
Clunk
Vent Line
Top View
Side View
Vent Line (faces top of fuselage)
To Muffler
To Carburetor
Step 3
Slide the fuel tank into the fuselage. Make sure the vent line
faces to the top as described in the previous step.
NOTE: SPECIAL CONSIDERATION FOR
FOUR-STROKE INSTALLATION
Step 3a
Use medium CA to glue the throttle pushrod guide to the
former as shown. Make sure the throttle linkage does not
bind when gluing the pushrod guide.
Step 4
Secure the tank in the fuselage using two 4-40 x 5/8-inch
socket head screws and two #4 washers and the fuel tank
stay. Tighten the screws using a 3/32-inch hex wrench or
ball driver.

19Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Step 2
Use cardstock to make template indicating the needle valve,
engine head and muffler, as well as any other items that may
protrude through the cowling.
Step 3
Remove the engine from the firewall and position the clear
cowling on the front of the fuselage. Use the templates and a
felt-tipped pen to transfer the locations to the clear cowling.
Step 5
Use the clear cowl as a template tor the painted cowl. Trim
the clear cowl to fit your particular engine. Remember to
leave enough room to install the muffler.
Step 5
Use hobby scissors and a rotary tool with a sanding drum to
neatly trim the painted cowl.
Step 6
Slide the cowling on the fuselage. The spinner backplate
will then be slid on the propeller shaft. Make sure the drive
washer on the engine in positioned correctly and the spinner
backplate is tight against the drive washer.
Note: The Dubro spinner will include adapters to fit a
variety of engine shafts. Make sure to select the correct
adapter for your application.
Note: The spinner is not included and will need to be
purchased separately.

20 Hangar 9 P-51D Mustang Sport 40 Assembly Manual
Step 7
Position the cowl so there is a 3/32-inch (2mm) gap between
the cowl and spinner backplate. Use a pin drill and 1/16-inch
(1.5mm) drill bit to drill through the mounting holes in the
cowling and into the fuselage.
Step 8
Slide the cowling forward to expose the holes in the
fuselage. Place 2–3 drops of thin CA in each of the four
holes to harden the surrounding wood. This will help prevent
the screws from vibrating loose.
Step 9
Use a #1 Phillips screwdriver to install the four #2 x 3/8-inch
self-tapping screws that secure the cowling to the fuselage.
Step 10
Slide the propeller into position.
Step 11
Slide the washer and thread the nut onto the engine shaft.
Rotate the propeller clockwise so it is resting against the
lugs of the spinner backplate. Use a 7/16-inch box end
wrench to tighten the propeller nut. Never use pliers, as the
nut will not be tight enough, and could come loose.