Troy Built Models P-39 Airacobra User manual

P-39 Airacobra
SAFETY PRECAUTIONS
INSTRUCTION MANUAL
First-time builders should seek advice from people having building
experience.If misused or abused,it can cause serious bodily injury
and damage to property.
Fly only in open areas and preferably at a dedicated R/C flying site.
We suggest having a qualified instructor carefully inspect your
airplane before its first flight.Please carefully read and follow all
instructions included with this airplane,your radio control system
and any other components purchased separately.
(The people under 18 years old is forbidden from flying this model)
This R/C airplane is not a toy!
Specification:
Length: 1788mm(70.4＂)
Wing span: 2040mm(80.3＂)
Wing area: 78.5sq.dm(8.5sq.ft)
Wing loading: 93g/sq.dm(30.5oz/sq.ft)
Flying weight: 7.3kg(16.1bs)
Radio: 6ch & 8servos
Engine: 30cc gasoline engine

4-cycle .180
18″X10
6
86
6
6 channel radio for aiplane is highly recommended for this model.
9
Optional parts: rubber wheel with metal hub.
Spinner
We strongly recommen you use the thread lock for all the screws when you build your model.

3-way
pressure inlet
Air tank
3-way
pressure inlet
3-way
pressure inlet
3-way
pressure inlet
3-way
pressure inlet
Switch
Air inlet
Strut
Strut
Strut
Quick release connector
Make sure to assemble retracts as instructed below.
Three wheel retract system
Quick release connector
Pressure reduction inlet
Ø1.7mm
Ø0.2mm
The status when the
gear up
Pull out length of 8mm
to make gear down
Air valve Air valve
Pleas notice the inner diameter for each
side of the pressure reduction inlet.
Please insure the sealing of the retract
system before flight .
3-way pressure inlet 5
1
Air tank
1
Air inlet
2
1
1
Air line (3000mm)
2
Quick release connector
Strut
( 90 )
1
Strut ( 90 )
Switch
Clevis
Rod (2X300mm)
1
1
1
Retainer
TP Screw(2.6x14mm) 2
1mm
Aileron
Trailing
edge
Make sure they are in
the right position while
installing.
8
6
2
2
2
4
2
2
2
2
Clevis
Rod (2x300mm)
Retainer
TP Screw (2.3x12mm)
Wooden Block(20x20x8mm)
Servo tray(68.5x56.5x2mm)
Pin hinge(24x24mm)
Screw (3x40mm)
Washer(3x15mm)
2
Washer(3x15mm)
Lock Nut (3mm )
Clevis
Retainer
Rod (2x300mm)
Screw (2x10mm)
6
Pin hinge(24x24mm)
Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
Install the servo as the illustration below
Install the nylon control horn and connect the linkage.
Keep some space about 1mm width between
aileron and trailing edge.
Apply instant AB glue to aileron and pin hinge.
Assemble the aileron to main wing with instant type AB glue. Be careful
to ensure the moving parts of the hinges are able to move freely.
Make sure hinges are
mounted in the same line.
1
2
3
4
5
1
Accessory list for the coming installation steps.

8
Pin hinge(24x24mm)
Flap
1mm
Make sure they are in
the right position while
installing.
Trailing
edge
8
8
2
2
2
4
2
2
2
2
Clevis
Rod (2x300mm)
Retainer
TP Screw (2.3x12mm)
Wooden Block(20x20x8mm)
Servo tray(68.5x56.5x2mm)
Pin hinge(24x24mm)
Screw (3x30mm)
Washer(3x15mm)
2
Washer(3x15mm)
Lock Nut (3mm )
TP Screw (2.3x12mm)
1.5mm
3mm
Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
8
TP Screw (2.3x12mm)
Rod (2x300mm)
Clevis
Washer(3x15mm)
Washer
Lock Nut (3mm )
Screw (3x40mm)
Screw (2x10mm)
Secure the servo.Install the nylon control horn
and connect the linkage.
Epoxy the pin hinges to the flap.
Keep some space about 1mm width between
trailing edge and flap.
Install the servo as the illustration below
Epoxy the flaps to the wings as illustration.
7
68
9
10
2
Accessory list for the coming installation steps.
150mm
The centre of the Gravity.
15
76

Epoxy the landing gear to the wing steadily.
Collar (5mm)
Collar (5mm)
Collar (5mm)
Collar 5mm 3
Install the wheel to the fixed landing gear.
Epoxy the fixed landing gear to the relevant
position in the fuselage.
Top view
Side View
40mm
40mm
RUDDER
Adjustment.
Top view
ELEVATOR
Side View
30mm
30mm
Centre of Gravity. Position for
right diagram.
Adjustment.
30mm
30mm
40mm
AILERON
FLAP
Side View
Adjustment.
AILERON FLAP
71
72
73
70
74
75
14
Clevis
Retainer
Rod (2x300mm)
Screw (2x10mm)
Install the nylon control horn and connect the linkage.
Wheel (100mm)
TP Screw (3x20mm)
Washer (3x6mm)
PVC part
Main wing joiner
Rib template (2mm ply)
2
8
8
2
1
1
2
LockNut (4mm)
2
Bushing (8x4mm)
Wood dowel (6x30mm) 2
Wood dowel (6x50mm) 2
Note:rubber wheels oleo struts
and retracts are optional.
2
2
Blind Nut (6mm)
Screw(6x50mm)
Reinforcement Plate 1
Mount the gear door and the wheel to the retract.
Secure the servo.Install the nylon control horn
and connect the linkage.
5mm
Cut away the surplus parts of plastic cover
carefully along the shaded line.
TP Screw (2.3x12mm)
1.5mm
3mm
8
TP Screw (2.3x12mm)
Bushing (8X4mm)
LockNut(4mm)
inside
Wheel (100mm)
Rod (2x300mm)
Clevis
Washer(3x15mm)
Washer
Lock Nut (3mm )
Screw (3x30mm)
Screw (2x10mm)
Trim the covering for assembling the wheel well carefully.
12
11 13
14
15
3
Accessory list for the coming installation steps.

A=A'
A`
A
Make sure to glue securely.
If not properly glued, a failure in flight may occur.
Securely glue together.If coming off during flights,
you'll lose control of your airplane which leads
to accidents!
1.8mm
TP Screw (3x20mm) 8
Washer (3x6mm) 8
TP Screw (3x20mm)
Washer (3x6mm)
According to the rib template drill holes to another
main wing.
6mm
According to the rib template drill holes in one wing and
epoxy wood dowel in them.
Wood dowel (6x30mm)
Rib template (2mm ply)
2
Wood dowel (6x30mm)
1
Rib template (2mm ply)
Main wing joiner
1
Main wing joiner
6mm
Rib template (2mm ply)
30mm
210mm
100mm
R10mm
R10mm
For air tube
For servo wire
Trim holes in the appropriate position in the wings
and drag the servo wire and the air tube out.
The sketch map when the main wing
assembled completely.
Epoxy the wheel house to the wings carefully.
Note:Please fix the air tube before
assemble the wheel house to the wing.
Assemble the landing gear to the wheel house.
17
18
20
21
4
16 19
Cut the surplus shaded portion carefully
off the canopy and exhaust .
Epoxy plies to relevant position inside the fuselage as
below for assembling the cowling.
Epoxy plies inside the fuselage under the cowing and
mount the canopy with TP screw as illustration.
TP Screw (2.3x8mm)
TP Screw (2.3x8mm)
1.5mm
6
TP Screw (2.3x8mm)
Ply (15x15x3mm) 6
1.5mm
8
TP Screw (2.3x8mm)
Ply (15x15x3mm) 8
2
Pvc part
2
Wooden Block(24x20x12mm)
2
Wooden Block(24x15x12mm)
2
7
Collar (5mm)
Wheel (100mm)
Wooden supporter
(41.5x28x26mm)
Landing gear(5mm)
21
12
TP Screw (3x20mm )
Landing gear straps
2
Gear door
2
1
Landing gear(5mm)
1
Wheel (90mm)
Wooden supporter
(46x28x14mm) 1
4
TP Screw (2.3x12mm)
1
Aluminum part(60x6mm)
TP Screw (3x20mm)
Wooden Block
TP Screw (3x20mm)
Collar (5mm)
Wooden supporter
Collar (5mm)
Washer (3x6mm)
Assemble the wheel and gear door to landing gear.
Epoxy the exhaust to appropriate position in the
fuselage as illustration.
69
65
13
67
66
68
Accessory list for the coming installation steps.

Trim the cowling for engine and muffler.
2
Pvc part
The servos installation finished sketch map.
14
Ply(15x15x3mm)
14
TP Screw (2.3x8mm)
1
Canopy
2
2
Clevis
Copper joiner
2
2
Screw (2x10mm)
Nut (2mm )
2
Washer(2x5mm)
Steel wire
Copper joiner
Lock Nut (2mm )
Screw (2x10mm)
Ball joint
Washer(2x5mm)
Install the servo.
Mount the servo of nose wheel to the fuselage.
Nose wheel servo
switch servo
Throttle servo
Elevator servo
Rudder servo
Install the servo of switch.
12
64
60
Accessory list for the coming installation steps.
62
61
63
Epoxy the main wing hardly together with wing joiner.
Drill holes to appropriate position in the front of mid
wing and epoxy wood dowel in them.
Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
2
Wood dowel (6x50mm)
Wood dowel (6x50mm)
6mm
80mm
6mm
80mm
11mm
Assemble the wings to the fuselage with screw
and blind nut as below.
6.2mm
Blind Nut
Reinforcement Plate
Screw(6x50mm)
2
2
Blind Nut (6mm)
Screw(6x50mm)
Reinforcement Plate 1
4
Blind Nut (4mm)
1
Engine mount (68x105mm)
Linkage Stopper
4
4
12
4
Washer(4x8mm)
Screw (4x35mm)
Spring Washer (4mm)
Nut (4mm)
2
4
Screw (4x25mm)
2
Plastic tube (2x650mm)
Fuel tank (550cc) 1
In case of 2-cycle & 4-cycle engine.
The front view of the engine installation finished.
Drill holes to relevant position in the fuselage.
23
22
5
2624
25
Accessory list for the coming installation steps.

Washer (4x8mm)
Washer (4x8mm)
Washer (4x8mm)
Screw (4x35mm)
Screw (4x25mm)
Nut (4mm)
Spring Washer (4mm)
4mm
Set Screw (3x4mm)
Set Screw (2mm)
Rod (2x650mm)
Set Screw (2mm)
Washer (2mm)
Linkage Stopper 1
1
1
1
Washer (4x8mm)
4
Set Screw (3x4mm)
The side sketch map of the engine installation finished.
Drill 4 holes and set blind nut in appropriate position
in the firewall before install the engine.
Install the engine carefully.
Assemble the accelerator push rod to the engine.
Engine installation finished sketch map.
162 mm
5.2mm
Blind Nut
Blind Nut (4mm) 4
Fuel supply line
Fuel spray line
Air pressure line
Assembly of the fuel tank.
27
28
29
30
32
6
31
Elevator servo
Rudder servo
The sketch map of the linkages for the rudder
and elevator in the fuselage.
2
1
wheel (90mm)
TP Screw(3x20mm) 4
2
Steel wire (0.5x1500mm)
2
Lock Nut (4mm )
Bushing (8X4mm)
2
2
Clevis
Copper joiner
2
2
Screw (2x10mm)
Nut (2mm )
2
Washer(2x5mm)
Rod (2x300mm) 1
1
Retainer
1
1
Air tank
Switch
Note:rubber wheels oleo struts
and retracts are optional.
Assemble the wheel and oleo strut to
the retract as illustration.
Assemble the retract to the fuselage with
TP Screw as illustration.
Assemble the steel wire to the nose arm.
Collar (5mm) 2
1
Wheel (75 mm)
1
Steering fullarm (60x6mm)
2
Washer(4x8mm)
2
Screw (4x25mm)
1
Aluminum shaft(5x50mm)
Brass collar (5mm)
Brass collar (5mm)
Wheel (75 mm)
Aluminum shaft
Screw (4x25mm)
Screw (4x25mm)
Washer(4x8mm)
Washer(4x8mm)
Steering fullarm (60x6mm)
1.8mm
TP Screw(3x20mm) 4
TP Screw(3x20mm)
Clevis 1
Install the rudder servo to appropriate position
in the fuselage.
56
55
59
60
11
58
Accessory list for the coming installation steps.

1mm
Rudder
Tailing
edge
Cut away the rubber tube when
the epoxy glue dried.
Make sure they are in
the right position while
installing.
Keep some space about 1mm width between
the tailing edge and the rudder.
Drill holes to the relevant position in the tailing edge
and epoxy the rudder to them.
2.5mm
3mm
30mm
90mm
75mm
2
Plastical tube(3x30mm)
2
Steel wire (0.5x3000mm)
2
2
2
Clevis
Washer(3x15mm)
Lock Nut (3mm )
1
Screw (3x80mm)
2
Copper joiner
Washer(3x15mm)
Screw (3x80mm)
Lock Nut (3mm )
Clevis
Aluminum tube
Steel wire
The sketch map after the rudder shaft assemble finished.
The sketch map of the linkage for the rudder
and the tail wheel.
2
2
Clevis
Copper joiner
2
2
Screw (2x10mm)
Nut (2mm )
2
Washer(2x5mm)
Steel wire
Copper joiner
Lock Nut (2mm )
Screw (2x10mm)
Ball joint
Washer(2x5mm)
Install the servo.
Drill a small hole to appropriate position in the fuselage
for installing the plastical tube and a hole in the rudder
for assembling the rudder shaft.
50
51
53
54
10
49 52
Mount the fuel tank to the fuselage.
Note: Customers can choose nylon stabbing fix the tank,
We don’t suppty nylon stabbing.
Linkage Stopper
Washer (2mm)
Washer (2mm)
Nut (2mm)
Set screw (3x4mm)
Washer ( 2mm )
Set screw (3x4mm)
1
1
1
1
Install the servo.
Assemble the throttle servo to appropriate
position in the fuselage.
B'
AA'
B
Make sure to glue securely.
If not properly glued, a failure in flight may occur.
Temporarily fasten down the main wing and
check its correct position.
Securely glue together.If coming off during flights,
you'll lose control of your airplane which leads
to accidents!
A=A'
B=B'
2
Steel wire (0.5x3000mm)
1
U-style wire (150x25mm)
Pin hinge(24x24mm) 6
4
Matal douel (4x30mm)
1
Rib template (2mm ply)
1
Stab joiner (12x310mm)
Assembly of the stabilizer.
Set the U-style wire through the enlargd hole as below.
2
1
Steel wire (0.5x3000mm)
U-style wire (150x3mm)
2
2
Clevis
Copper joiner
2
2
Screw (2x10mm)
Nut (2mm )
2
Washer(2x5mm)
2
Plastical tube(3x30mm)
35 37
36
33
34
7
Accessory list for the coming installation steps.

4mm
4
Wood dowel (4x30mm)
Wood dowel (4x30mm)
Rib template (2mm ply)
Drill two holes at the stabilizer root base via rib template
and epoxy the wood dowel in them.
1mm
Elevator
Tailing
edge
Make sure they are in
the right position while
installing.
Keep some space about 1mm width between
elevator and tailing edge.
Trim slot to appropriate position in the stabilizer .
Apply instant type CA glue to elevator and pin hinge.
Assemble the stabilizers carefully to the fuselage.
4mm
Rib template (2mm ply)
1
Rib template (2mm ply)
1
Stab joiner (12x310mm)
Stab joiner (12x310mm)
Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
1x20mm
Make sure hinges are
mounted in the same line.
3mm
6
Pin hinge(24x24mm)
According to the rib template drill holes to the tail of
fuselage and assemble the "U"style wire as illustration.
39 42
41
8
40
38
43
Elevator servo
Glue the elevator to the stabilizer by CA and epoxy.
Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
2
2
Clevis
Copper joiner
2
2
Screw (2x10mm)
Nut (2mm )
2
Washer(2x5mm)
Steel wire
Copper joiner
Lock Nut (2mm )
Screw (2x10mm)
Ball joint
Washer(2x5mm)
Install the servo.
4
Plastical tube(3x30mm)
2
Steel wire (0.5x3000mm)
2
2
2
Clevis
Washer(3x15mm)
Lock Nut (3mm )
1
Screw (3x80mm)
4
Copper joiner
3
Pin hinge(2.5x48mm)
Make sure hinges are
mounted in the same line.
Drill holes to appropriate position in the rudder and epoxy
the ping hinges in them
30mm
25mm
80mm
2.5mm
3
Pin hinge(2.5x48mm)
2
Clevis
2
2
Screw (2x10mm)
Nut (2mm )
2
Washer(2x5mm)
Assemble the elevator sever to appropriate position
in the fuselage.
Connect the elevator and the serer via the steel wire.
45
46
47
9
48
44
Accessory list for the coming installation steps.