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T-28 Trojah
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 :1613 mm(63.5")
Wing Span :2057 mm(81")
Wing Area :70.12 sq. dm
7.55 sq. ft
Wing Loading :117 g/sq. dm
39.5 oz/sq. ft
Flying Weight :8.2 kg(18 lbs)
Radio :6ch & 8 servos
Engine :180 4-cycle
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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 nut
We strongly recommen you use the thread lock for all the screws when you build your model.
Page 3
Make sure hinges are
mounted in the same line.
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 (3x50mm)
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.
Apply instant CA glue to aileron and pin hinge.
Keep some space about 1mm width between
aileron and trailing edge.
Assemble the aileron to main wing with instant type CA glue. Be careful
to ensure the moving parts of the hinges are able to move freely.
1
2
3
4
5
1
Accessory list for the coming installation steps.
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
Page 4
6
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 (3x50mm)
Washer(3x15mm)
2
Washer(3x15mm)
Lock Nut (3mm )
Rod (2x300mm)
Clevis
Washer(3x15mm)
Washer
Lock Nut (3mm )
Screw (3x50mm)
Screw (2x10mm)
TP Screw (2.3x12mm)
3mm
1.5mm
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
Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
Epoxy the flaps to the wings as illustration.
7
6
8
9
10
2
Accessory list for the coming installation steps.
30mm
30mm
40mm
AILERON
FLAP
Side View
FLAP
AILERON
Adjustment.
Top view
ELEVATOR
Side View
30mm
30mm
Centre of Gravity.
Position for
right diagram.
Adjustment.
123mm
Top view
Side View
40mm
40mm
RUDDER
Adjustment.
The centre of the Gravity.
Epoxy the fixed landing gear to the relevant
position in the fuselage.
77
15
76
79
78
81
80
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1mm
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 landing gear to the wing steadily.
Collar (5mm)
Collar (5mm)
Collar (5mm)
Collar 5mm
3
Install the wheel to the fixed landing gear.
2
Wooden Block(49x22x12mm)
1
Wooden Block(19x15x10mm)
2
Wooden Block(53x22x12mm)
2
7
Collar (5mm)
Wheel (100mm)
Wooden supporter
(41.5x28x26mm)
Landing gear(5mm)
2
1
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)
The sketch map when the gear up and down.
TP Screw (2.3x12mm)
Wooden Block(19x15x10mm)
Drill holes to appropriate position in the belly pants and the
wings and epoxy the belly pant to the wing as diagram.
72
73
71
74
75
14
Accessory list for the coming installation steps.
Wood dowel (6x50mm)
Wheel (100mm)
TP Screw (3x20mm)
Washer (3x6mm)
PVC part
Main wing joiner
Rib template (2mm ply)
2
Gear door
Gear door
1
2
8
8
2
1
1
2
LockNut (4mm)
2
Bushing (8x4mm)
Wood dowel (6x30mm)
2
Note:rubber wheels oleo struts
and retracts are optional.
2
2
2
Wooden Block(9mm)
2
2
Blind Nut (6mm)
Screw(6x50mm)
Reinforcement Plate
1
2
Pin hinge (36x20x1mm)
4
Screw (2x10mm)
Washer (2x5mm)
8
4
Nut (2mm )
8
TP Screw (2.3x12mm)
Mounting plate
LockNut(4mm)
Bushing (8X4mm)
inside
LockNut(4mm)
Bushing (8X4mm)
inside
Wheel (100mm)
Mount the gear door and the wheel to the retract.
Clevis
Retainer
Rod (2x300mm)
Screw (2x10mm)
Install the nylon control horn and connect the linkage.
1.5mm
TP Screw (2.3x12mm)
3mm
Rod (2x300mm)
Clevis
Washer(3x15mm)
Washer
Lock Nut (3mm )
Screw (3x50mm)
Screw (2x10mm)
8
TP Screw (2.3x12mm)
Secure the servo.Install the nylon control horn
and connect the linkage.
Appropriate
position
Screw (2x10mm)
Washer (2x5mm)
Nut (2mm )
Washer (2x5mm)
Note:rubber wheels oleo struts
and retracts are optional.
TP Screw (2.3x12mm)
Mount the gear door and the wheel to the retract.
5mm
Cut away the surplus parts of plastic cover
carefully along the shaded line.
Strut ( 90 )
12
13
11
15
3
14
Accessory list for the coming installation steps.
Page 6
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!
Note:Please fix the air tube before
assemble the wheel house to the wing.
TP Screw(3x20mm)
2mm
2
Pin hinge (36x20x1mm)
1.5mm
Cut the shaded portion away from the available
pin hinges and enlarge the holes as below.
1.5mm
TP Screw (2.3x12mm)
4
TP Screw (2.3x12mm)
The sketch map when the main wing
assembled completely.
Epoxy the wheel house to the wings carefully.
2mm
A
B
A’
B’
A=A’
B=B’
Screw (2x10mm)
Washer (2x5mm)
Nut (2mm )
Washer (2x5mm)
4
Screw (2x10mm)
Washer (2x5mm)
8
4
Nut (2mm )
TP Screw(3x20mm)
8
Put the pin hinge to appropriate position on the baffle
and drill holes in the baffle as illustration.
Put the retracts to the wing and find out the relevant
position the other part of the pin hinge,drill holes in
the clapboard
Assemble the retracts and the baffle to the landing
gear as illustration.
17
18
20
21
4
16
19
TP Screw (2.3x8mm)
6
TP Screw (2.3x8mm)
Ply (15x15x3mm)
6
Cut off the surplus shaded portion carefully
of the canopy below.
Epoxy plies to relevant position inside the fuselage as
below for assembling the cowling.
TP Screw (2.3x8mm)
8
TP Screw (2.3x8mm)
Ply (15x15x3mm)
8
Epoxy plies inside the fuselage under the cowing and
mount the cowling with TP screw as illustration.
Wooden Block(100x20x3mm)
Wooden Block(100x20x3mm)
2
hatch hinges(3mm)
2
hatch hinges(3mm)
1mm
Landing gear(0.8mm)
1.5mm
1.5mm
2mm
1.5mm
Screw (2x10mm)
Washer (2x5mm)
Nut (2mm )
TP Screw (2.3x12mm)
16
Screw (2x10mm)
Washer (2x5mm)
34
20
Nut (2mm )
20
TP Screw (2.3x12mm)
4
Pin hinge (36x20x1mm)
2
Metal wire (0.8mm)
Epoxy the wood plates to the relevant place outside
the belly cover as picture.
Epoxy the wood plates to the appropriate position
inside the belly cover as picture.
Fix the pinned hinges to the belly cover and the wheel
pants,let the the spring pass the holes in the metal wire
and fix the matel wire to the pinned hinges as illustration.
70
65
13
Accessory list for the coming installation steps.
67
66
68
69
Page 7
Trim the cowling for engine and muffler.
Assemble the receiver and the battery to appropriate
positon in the fuselage.
The servos installation finished sketch map.
Throttle servo
Rudder servo
Elevator servo
switch servo
16
Screw (2x10mm)
Washer (2x5mm)
34
20
Nut (2mm )
20
TP Screw (2.3x12mm)
4
2
Pin hinge (36x20x1mm)
14
Ply(15x15x3mm)
14
TP Screw (2.3x8mm)
1
2
2
Canopy
Wooden Block(100x20x3mm)
hatch hinges(3mm)
B'
A
A'
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'
Assembly of the stabilizer.
Metal wire (0.8mm)
Nose wheel servo
Install the servo of switch.
12
64
60
Accessory list for the coming installation steps.
62
61
63
15mm
120mm
6mm
According to the rib template drill holes to another
main wing.
2
Wood dowel (6x30mm)
Rib template (2mm ply)
6mm
1
Rib template (2mm ply)
6mm
Main wing joiner
1
Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
6mm
120mm
2
Wood dowel (6x50mm)
Rib template (2mm ply)
According to the rib template drill holes in one wing and
epoxy wood dowel in them.
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.
20mm
120mm
60mm
R10mm
R10mm
Air tube
Servo wire
Drill holes to relevant position in the fuselage.
Trim holes in the appropriate position in the wings
and drag the servo wire and the air tube out.
23
22
26
5
2724
25
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4mm
4
Wood dowel (4x30mm)
Wood dowel (4x30mm)
Rib template (2mm ply)
6.2mm
Blind Nut
Screw(6x50mm)
2
2
Blind Nut (6mm)
Screw(6x50mm)
Reinforcement Plate
Reinforcement Plate
1
Assemble the wings to the fuselage with screw
and blind nut as below.
2
1
Steel wire (0.5x3000mm)
U-style wire (170x3mm)
B'
A
A'
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 (170x25mm)
Pin hinge(24x24mm)
6
4
Matal douel (4x30mm)
1
Rib template (2mm ply)
1
Stab joiner (12x270mm)
4mm
1
Rib template (2mm ply)
Rib template (2mm ply)
Assembly of the stabilizer.
Set the U-style wire through the enlarge hole as below.
A ccording to thr rib template drill holes to the tail of
fuselage as below.
Drill two holes at the stabilizer root base via rib template
and epexy the wood dowel in them.
28
29
30
32
6
31
Accessory list for the coming installation steps.
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.
The sketch map of the linkages for the rudder
and elevator in the fuselage.
70mm
110mm
2
Plastical tube(3x30mm)
2.5mm
Drill holes to the relevant position in the tailing edge
and epoxy the rudder to them.
Drill a small hole to appropriate possition in the
fuselage for installing the plastical tube.
60mm
3mm
4
4
Clevis
Copper joiner
4
4
Screw (2x10mm)
Nut (2mm )
4
Washer(2x5mm)
Steel wire
Copper joiner
Lock Nut (2mm )
Screw (2x10mm)
Ball joint
Washer(2x5mm)
Install the servo.
56
55
59
60
11
58
57
Page 9
TP Screw(3x20mm)
TP Screw(3x20mm)
4
1.8mm
1mm
Rudder
Tailing
edge
Cut away the rubber tube when
the epoxy glue dried.
Make sure they are in
the right position while
installing.
Make sure hinges are
mounted in the same line.
4
Pin hinge(2.5x48mm)
30mm
126mm
126mm
126mm
Drill holes to appropriate position in the rudder and epoxy
the ping hinges in them
Keep some space about 1mm width between
the tailing edge and the rudder.
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)
Assemble the retract to the fuselage with
TP Screw as illustration.
Assemble the steel wire to the nose arm.
Install the servo.
Mount the servo of nose wheel to the fuselage.
50
51
53
54
10
49
52
1mm
Elevator
Tailing
edge
Make sure they are in
the right position while
installing.
Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
1
Stab joiner (12x270mm)
Securely glue together. If coming off during flights, you 'll
lose control of your airplane which leads to accidents!
1x20mm
Keep some space about 1mm width between
elevator and tailing edge.
Trim slot to appropriate position in the stabilizer .
Glue the elevator to the stabilizer by CA and epoxy.
Apply instant type CA glue to elevator and pin hinge.
Assemble the stablilizers carefwly to fuselage.
Make sure hinges are
mounted in the same line.
6
Pin hinge(24x24mm)
3mm
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
35
36
37
33
34
7
Accessory list for the coming installation steps.
Page 10
In case of 2-cycle & 4-cycle engine.
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)
160 mm
5.2mm
Blind Nut
Blind Nut (4mm)
4
The front view of the engine installation finished.
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.
39
42
41
8
40
38
43
2
Plastical tube(3x30mm)
2
1
wheel (90mm)
TP Screw(3x20mm)
4
2
Steel wire (0.5x3000mm)
2
Steel wire (0.5x1500mm)
2
2
2
Clevis
Washer(3x15mm)
Lock Nut (3mm )
2
Lock Nut (4mm )
1
Screw (3x80mm)
2
Copper joiner
4
Pin hinge(2.5x48mm)
Fuel supply line
Fuel spray line
Air pressure line
Linkage Stopper
Washer (2mm)
Washer (2mm)
Nut (2mm)
Set screw (3x4mm)
Washer (
2mm
)
Set screw (3x4mm)
1
1
1
1
Note: Customers can choose nylon stabbing fix the tank,
We don’t suppty nylon stabbing.
Mount the fuel tank to the fuselage.
Install the servo.
Assemble the throttle servo to appropriate
position in the fuselage.
Assembly of the fuel tank.
Bushing (8X4mm)
6
6
Clevis
Copper joiner
6
6
Screw (2x10mm)
Nut (2mm )
6
Washer(2x5mm)
Clevis
1
Rod (2x300mm)
1
1
Retainer
1
Ring
1
1
Air tank
Switch
Retracts strut
Nut (4mm)
Bushing (8X4mm)
Note:rubber wheels oleo struts
and retracts are optional.
wheel (90mm)
Assemble the wheel and oleo strut to
the retract as illustration.
45
46
47
9
48
44
Accessory list for the coming installation steps.
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