Troy Built Models PA-25 User manual

PA - 25
Specification:
Length :1694 mm(66.7")
Wing Span :2449 mm(96.4")
Wing Area :87.1sq.dm
9.4sq.ft
Wing Loading :71.2g/sq.dm
23.3oz/sq.ft
Flying Weight :6.2kg(13.6lbs)
Radio :6ch & 8servos
Engine: :26cc-30cc
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!

: 4-cycle .120
15"X7
6
(with 8 servos),
6
6
6 channel radio for aiplane is highly recommended for this model.
Warning
Remove the covering with proper
pressure to cut through only the covering itself.Otherwise,
cutting down into the balsa structure may weaken the
model part and cause accident.
The pre-covered film on ARF kits may wrinkle due to
variations of temperature.Smooth out as explained right.
2.5 in Spinner
Pre-cover the covering with clean cloth!
Start at low setting. Increase the setting if
necessary.If it is too high,you may damage
the film.
Iow setting
with cover(cloth)

Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
8
2
2
Rod (2.5x300mm)
TP Screw (2.3x12mm)
Servo tray(70x58x2mm)
Pivot&round hinge(4.5X67mm) 6
Install the aileron servo to the servo mount as illustration
below.
Install the control horn and connect the linkage.
Make sure hinges are
mounted in the same line.
1mm
Trailing
edge
Cut away the rubber tube when
the epoxy glue dried.
Make sure they are in
the right position while
installing.
Aileron
Collar (2.5mm)
2
2
2
2
2
2
Screw (3x16mm)
Nut (3mm )
Clevis
Aluminum Washer (3x6mm )
Nut
Clevis
Washer 3x6mm
Screw 3x16mm
Collar
Control horn
6
pivot & round hinges(4.5x67mm)
Apply instant type AB glue to appropriate position in the
trailing edge and assemble the ailerons to them.
Apply instant type AB glue to appropriate position of the aileron and
pivot & round hinges. Insert the pivot & round hinges to the ailerons.
Keep about 1mm width space between the aileron and
the trailing edge.
Accessory list for the coming installation steps.
1
2
3
4
5
1
Top view
Position for
right diagram.
ELEVATOR
40mm
40mm
Adjustment of the elevator,be sure it can work perfectly.
The side view when the install completion.
The front view when the install completion.
110mm
100mm
Centre of the Gravity.
63
61
60
12
62

TP Screw (2.3x12mm)
1.5mm
Epoxy the pin hinges to the flap.
4
Pin hinge(24x24mm)
Flap
1mm
Make sure they are in
the right position while
installing.
Trailing
edge
Keep about 1mm width space between trailing edge
and flap.
Install the flap servo to the servo mount as illustration
below.
Epoxy the flaps to the wings as illustration.
Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
8
2
2
Rod (2.5x300mm)
TP Screw (2.3x12mm)
Servo tray(70x58x2mm)
Pin hinge(24X24mm) 4
Collar (2.5mm)
2
2
2
2
2
2
Screw (3x16mm)
Nut (3mm )
Clevis
Aluminum Washer (3x6mm )
Control horn
Apply instant type AB glue to the control horn and the slots in the
aileron, insert the control horn to the slots as illustration.
6
7
8
9
10
2
Accessory list for the coming installation steps. Trim the canopy carefully along the shaded line.
Assemble the canopy to the fuselage with TP screws.
Drill holes to appropriate position in the cowling and assemble
the cowling to the fuselage with TP screws as illustration.
Fix the fuselage top cover to the fuselage with screws as
illustration.
Screw (3x35mm)
Washer (3x6mm)
5
TP Screw (3x10mm)
6
TP Screw (2.3x8mm)
40mm
40mm
AILERON
Adjustment of the aileron and flap,be sure they can work
perfectly.
AILERON Flap Flap AILERON
50mm
50mm
Top view
RUDDER
Side View
Adjustment of the rudder, be sure it can work perfectly.
3mm
57
11
54
58
55
56 59

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!
AA ’
A=A'
B=B'
BB ’
TP Screw (2.3x12mm)
1.5mm
Install the control horn and connect the linkage.
3mm
Insert the main wing joiner to the wing.
Assemble the wings to the fuselage through the main
wing joiner carefully.
Main wing joiner (20x550mm)
Nut
Clevis
Washer 3x6mm
Screw 3x16mm
Collar
1
Main wing joiner (20x550mm)
The standard sketch map when the kit install completion.
Secure the flap servo, install the control horn and connect
the linkage.
1
Main wing joiner (20x550mm)
2
Washer (3x6mm)
2
Screw (3x16mm)
12 14
13
11
15
3
Accessory list for the coming installation steps.
TP Screw ( 2.3x12mm)
Gear plate
TP Screw ( 2.3x8mm)
TP Screw ( 3x10mm)
Main landing gear
Screw (3x16mm)
Screw (3x35mm)
2
Wheel (110 mm)
Washer (3x6mm)
LockNut (5mm)
LockNut (5mm)
Collar (5mm)
Accessory list for the coming installation steps.
Install the wheels to the undercarriage.
The sketch map when the undercarriage install completion.
Fix the wing struts to the fuselage and wings via Alu
localizers & screws.
Put the fuselage top cover to appropriage position on the
fuselage.
Fix the undercarriage to the fuselage with gear plates
and TP screws.
8
Screw (3x16mm)
Washer (3x8mm) 8
2
Collar (5mm)
10
2
1
8
6
5
4
8
2
TP Screw (2.3x12mm)
Screw (3x16mm)
Washer (3x8mm)
50
51
52
53
10
49

Apply instant type AB glue to appropriate position of the elevator and
pivot & round hinges. Insert the pivot & round hinges to the elevator.
Epoxy the elevator to the stabilizer.
Assemble the stabilizer to the fuselage through the stabilizer
joiner.
1mm
Tailing
edge
Cut away the rubber tube when
the epoxy glue dried.
Make sure they are in
the right position while
installing.
Keep about 1mm width space between elevator
and trailing edge.
Elevator
Accessory list for the coming installation steps.
Fix the wing to fuselage with screws throught the holes
applied in the wings and fuselage.
2
2
Rod (2x300mm)
Pivot&round hinge(4.5X67mm) 6
Collar (2mm)
2
2
2
Screw (2x10mm)
Nut (2mm )
1
Stabilizer joiner (12x297mm)
2
Washer(2x6mm) 4 Washer(3x6mm)
Screw (3x16mm) 4
2
Clevis
8
TP Screw (2.3x12mm)
Control horn
Screw
Spring Washer
2
Washer (3x6mm)
2
Screw (3x16mm)
Make sure hinges are
mounted in the same line.
6
Pivot&round hinge(4.5x67mm)
Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
20
16
19
18
4
17
Linkage Stopper
Washer (2mm)
Washer (2mm)
Nut (2mm)
Set screw (3x4mm)
Washer (
2mm )
Set screw (3x4mm)
1
1
1
1
Mount the receiver and the battery to appropriate position
in the fuselage.
The sketch map when the engine install completion.
Install the servo of the throttle.
Assemble the servo in the fuselage.
Fuel supply line
Fuel spray line
Air pressure line
Assembly of the fuel tank.
Fix the fuel tank to appropriate position in the fuselage
with cable tie.
cable tie
cable tie
cable tie 2
44
43
48
46
47
9
45

Fix the stabilizers to the tail fuselage via screws.
Nut
Washer 2x5mm
Screw 2x10mm
Collar
Install the control horn and connect the linkage.
Epoxy the control horn to the slots in the elevator,assemble the
elevator servo to the fuselage as illustration.
TP Screw (2.3x12mm)
4
Washer(2x5mm)
Screw (2x10mm) 4
Collar (3mm)
3
1
1
Tail landing gear 3mm
Tail wheel (45mm)
Aluminium plate
Accessory list for the coming installation steps.
Install the tail landing gear.
4
3
Clevis
4
Copper joiner
4
Aluminum tube
2
2
1
Steel wire (0.5x3000mm)
Collar
Collar
Collar
aluminium plate
TP Screw (2.3x12mm)
Control horn
Pivot&round hinge(4.5X67mm) 3
4
Nut (2mm )
Screw
Spring Washer
4
Washer(3x6mm)
Screw (3x25mm) 4
According to the illustration below bend the tail landing
gear wire and cut off the surplus part.
42mm
25mm
22
21
23
5
25
24
Install the engine mount tubes to the fuselage,lock them
from inside of the fuselage.
Assemble the engine to the fuselage via the engine
mount tubes and screws.
4
Washer(4x8mm)
4
Screw (4x45mm)
Washer(4x8mm)
Screw (4x45mm)
Screw (4x20mm)
Washer(4x8mm)
4
Washer(4x8mm)
4
Screw (4x20mm)
Set Screw (3x4mm)
Set Screw (2mm)
Rod (2x200mm)
Set Screw (2mm)
Washer (2mm)
Linkage Stopper
1
1
1
1
1
4
4
Washer (4x8mm)
4
Rod (2x200mm)
Blind Nut (5mm)
Screw (4x25mm)
Set Screw (3x4mm)
Assemble the throttle linkage.
Drill four holes at the diameters as shown for engine
mount.
160mm
4.2mm
The front view once the engine install completion.
The side view once the engine install completion.
39 42
40
41
8
37
38

1mm
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 rudder
and tail edge.
Epoxy the rudder to the vertical fin..
Assemble the tail landing gear to tail fuselage as below.
Epoxy the control horns to the slots in the rudder.
Rudder
Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
Make sure hinges are
mounted in the same line.
TP Screw (2.3x12mm)
42mm
25mm
3mm
Trim a slot and drill a hole in the rudder for helping
assemble the tail landing to it.
Epoxy the aileron and pivot & round hinges and the
landing gear to the rudder as illustration.
27
26
6
29
28 31
30
2
2
Clevis
Copper joiner
2
Screw (2x10mm)
2
Washer(2x5mm)
Steel wire
Copper joiner
Lock Nut (2mm )
Screw (2x10mm)
Clevis
Washer(2x5mm)
Install the servo of the rudder.
Assemble the servo of the rudder in the fuselage and
connect the servo and the rudder via steel wires.
Lock the linkage to the control horn with screws and nuts
as below. The sketch map of how the steel wires works for the rudder.
Nut 2mm
Screw (2x10mm)
Washer(2x5mm)
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!
The sketch map should be when the rudder and stabilizer
install completion.
A = A ’
B = B ’
AA ’
BB ’
Accessory list for the coming installation steps.
1
Engine mount (60x5mm)
Linkage Stopper
12
4
Washer(4x8mm)
Screw (4x45mm)
2
4
Screw (4x20mm)
4
4
Plastic tube (2x400mm)
Fuel tank (550cc) 1
1
Cable tie 2
Rod (2x200mm)
Blind Nut (5mm)
Steel wire
Copper joiner
Aluminum tube
Clevis
33
34
35
32
36
7