Troy Built Models B-25 Mitchell User manual

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!

B-25 Mitchell

Specification:

Length :1935 mm(76.2")

Wing Span :2420 mm(95")

Wing Area :77.6 sq. dm

7.82/sq.ft

Wing Loading :128 g/sq. dm

42 oz/sq. ft

Flying Weight :10 kg(22.1 lbs)

Radio :6ch&13 servos

Engine(a pair) :91 4-cycle

: 4-cycle .91

14"x7

Spinner nut

(with 13 servos),

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.

Apply

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)

1mm

Aileron

Trailing

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!

Make sure hinges are

mounted in the same line.

Pin hinge(24x24mm)

Clevis

Rod (2x300mm)

Retainer

TP Screw (2.3x12mm)

Wooden Block

(20x20x8mm)

Servo tray(68.5x56.5x2mm)

Pin hinge(24x24mm)

Screw (3x40mm)

Washer(3x15mm)

Lock Nut (3mm )

Clevis

Retainer Rod (2x300mm)

Screw (2x10mm)

Install the nylon control horn and connect the linkage.

Install the servo as the illustration below

Apply instant type CA glue to aileron and pin hinge.

Keep 1mm width space between aileron and trailing edge.

Assemble the aileron to main wing with instant

type CA glue.

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

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

Air tank

Air inlet

Air line (3000mm)

Quick release connector

Strut

( 90 )

Strut ( 110 )

Switch

Clevis

Rod (2X300mm)

Retainer

TP Screw(2.6x14mm) 2

TP Screw (2.3x12mm)

1.5mm

Pin hinge(36x20x1mm)

PVC

PVC Securely glue together. If coming off during flights, you 'll

lose control of your airplane which leads to accidents!

3mm

Pin hinge(36x20x1mm)

Clevis

Rod (2x300mm)

Retainer

TP Screw (2.3x12mm)

Wooden Block

(20x20x8mm)

Servo tray(68.5x56.5x2mm)

Screw (3x50mm)

Washer(3x15mm)

Lock Nut (3mm )

Rod (2x300mm)

Clevis

Washer(3x15mm)

Washer

Lock Nut (3mm )

Screw (3x40mm)

Flap

1mm

Make sure they are in

the right position while

installing.

Trailing

edge

Screw (2x10mm)

Install the servo as the illustration below

Secure the servo.Install the nylon control horn and

connect the linkage.

Epoxy the pin hinges to the flap.

Leave some space with width of 1mm between

trailing edge and flap.

Be careful to ensure the moving parts of the hinges

are able to move freely. Epoxy the flap to the main wings.

Accessory list for the coming installation steps.

85mm

Centre of Gravity.

TP Screw (2.3x12mm)

1.5mm

2mm

Pin hinge(36x20x1mm)

Clevis

Retainer

Rod (2x300mm)

Clevis

Washer(3x15mm)

Washer

Lock Nut (3mm )

Screw (3x50mm)

Flap

1mm

Make sure they are in

the right position while

installing.

Trailing

edge

Screw (2x10mm)

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

Epoxy the flap to the mid wing.

Install the nylon control horn and connect the linkage.

Epoxy the pin hinges to the flap.

Secure the servo.Install the nylon control horn and

connect the linkage.

Keep some space of 1mm width between the flap

and trailing edge.

Epoxy the nose landing gear to appropriate position

inside the fuselage.

Top view

Position for

right diagram.

ELEVATOR

Side View

20mm

Adjustment.

Top view

Side View

25mm

RUDDER

Adjustment.

AILERON

40mm

FLAP

20mm

Side View

AILERON FLAP

Adjustment.

TP Screw (2.3x12mm)

Blind Nut (4mm)

Engine mount (106x86mm)

Linkage Stopper

Washer(4x8mm)

Screw (4x35mm)

Spring Washer (4mm)

Nut (4mm)

Screw (4x25mm)

Plastic tube (2x400mm)

Fuel tank (550cc) 2

3mm

Hook screw 2

1.5mm

Rod (2x300mm)

Clevis

Washer(3x15mm)

Washer

Lock Nut (3mm )

Screw (3x50mm)

Clevis

Retainer

Rod (2x300mm)

Screw (2x10mm)

PVC

75mm

Install the nylon control horn and connect the linkage.

Secure the servo.Install the nylon control horn

and connect the linkage.

Cut off the surplus portion carefully along the shaded line.

Glue these PVC parts to relevant position on

the wings with CA glue.

Glue this PVC part to relevant position on the right wing.

Accessory list for the coming installation steps.

Ply (30x30x9mm) 2

Rubber band

Mount the receiver and the battery to the fuselage.

Landing gear 1

Copper joiner

Clevis 2

(5mm)

Collar (5mm) 7

Steel wire (0.5x1500mm)

Wheel (75 mm)

Wheel (115 mm)

TP Screw(3x20mm) 8

Landing gear (5mm)

Wooden Block(56x29x26mm)

Wooden Block(89x29x14mm) 1

Landing gear straps 4

Ally nose arm

42mm

decorate

Epoxy the decoration part to the fuselage carefully as

below.

Steel wire

Copper joiner

Aluminum tube

Clevis

Add a rubber ring to the

clevis for insuring safety

Collar (5mm)

Collar 4mm 3

Epoxy the main landing gear to the side fuselage.

Install the nose landing gear as below.

Collar (5mm)

Wooden supporter

Collar (5mm)

TP Screw (3x20mm)

3x20mm TP Screw

Landing gear straps 4

Collar 4mm 4

Install the main landing gear and fix it to the wooden

supporter steadily.

Accessory list for the coming installation steps.

PVC Part 2

Epoxy the PVC part to the fuselage carefully as below.

PVC Part 2

Epoxy the PVC part to the fuselage carefully as below.

1.5mm

TP Screw (2.3x8mm)

PVC Part

Ply (15x15X3mm)

PVC Part 1

75mm

280mm

Epoxy the PVC part to the fuselage carefully as below.

Epoxy plies to appropriate position in the fuselage under

the PVC part and assemble the PCV part to the fuselage

with TP screw as illustration.

Epoxy the PVC part to appropriate position in the

fuselage as illustration.

Accessory list for the coming installation steps.

147 mm

5.2mm

Blind Nut

Blind Nut (4mm)

Washer (4x8mm)

Screw (4x35mm)

Screw (4x25mm)

Nut (4mm)

Spring Washer (4mm)

4mm

Set Screw (3x4mm)

Set Screw (2mm)

Rod (2x400mm)

Set Screw (2mm)

Washer (2mm)

Linkage Stopper 2

Set Screw (3x4mm)

In case of 2-cycle & 4-cycle engine.

Assemble the engine as below.

Assemble the accelerator push rod to the engine.

Fix the hook screw to wood block and epoxy the wood block

to appropriate position in the side faselage as below.

The sketch map of the the push rod assemble

completion

The front view and side view when the engine install

completion.

Drill four holes as show for engine mount.

Hook screw

Rubber band

16mm

PVC Part

TP Screw (2.3x8mm)

PVC Part

Decorate

Ply (15x15x3mm)

1.5mm

TP Screw (2.3x8mm)

Ply (15x15X3mm)

1.5mm

TP Screw (2.3x8mm)

PVC Part

Ply (15x15X3mm)

PVC Part 1

Assemble the switch servo to the fuselage.

Epoxy the belly pant to main wing and drill holes to

relevant position on the belly pant.

Cut off the surplus part carefully along the shaded

line.

Epoxy plies to appropriate position in the fuselage which

under the fiber part and assemble the fiber part to fuselage

with screw.

Epoxy plies to appropriate position in the fiber part under

the PVC part and assemble the PVC part to fiber parts

with TP screw as illustration.

76 78

77 79

Accessory list for the coming installation steps.

Linkage Stopper

Washer (2mm)

Nut (2mm)

Set screw (3x4mm)

Fuel tank (550cc) 2

Washer (4x12mm) 2

Blind Nut (4mm)

TP Screw (3x20mm) 26

TP Screw ( 2.3x8mm)

Ply (15x15x3mm) 26

Nut (4mm)

Wheel (115mm)

Note:rubber wheels oleo struts

and retracts are optional.

Nut (5mm )

Wheel (110 mm)

Nut (4mm )

Wheel (115 mm)

Decorate

Wood dowel (468x50x3mm) 2

Reinforcement Plate 2

Screw (4x45mm)

Screw (4x75mm)

Fuel supply line

Fuel spray line

Air pressure line

Bushing (8X4mm)

Install the servo.

Assemble the throttle servos in the fuselage.

Assembly of the fuel tank.

Assemble the rear wheels.

29 32

Accessory list for the coming installation steps.

Assembly of the fuel tank

Assemble the horizontal tail to fuselage as below.

1.5mm

TP Screw (2.3x8mm)

PVC Part 1

Assemble the canopy to the canopy mount with

screw.

Ply (10x10x2mm) 4

Cut off the surplus part carefully along the shaded

line.

TP Screw (3x20mm)

1.5mm

Install the nose landing gear to appropriate

position in the fuselage.

10mm

TP Screw ( 2.3x8mm)

Ply (15x15x3mm)

1.5mm

Clevis

Copper joiner

Aluminum tube(3x6mm)

Screw (2x10mm)

Nut (2mm )

Washer(2x5mm)

Steel wire

Copper joiner

Aluminum tube Lock Nut (2mm )

Screw (2x10mm)

Ball joint

Washer(2x5mm)

Assemble the steeling fullarm around the landing gear.

Install the servo.

Add a rubber ring to the

clevis for insuring safety

Assembly of the switch servo.

Trim the surplus portion for assemble the nose gear freely.

Epoxy plies to appropriate position in the fuselage which

under the nose gear cover and assemble the nose gear

cover to fuselage with screw.

1.5mm

TP Screw (2.3x8mm)

Ply (15x15x3mm) 10

1.5mm

TP Screw ( 2.3x8mm)

Ply (15x15x3mm)

Decorate

Epoxy the plies under the covering and assemble

it to side fuselage with screw.

Trim the cowling for engine and muffler.

epoxy the ply under cowling and assemble the

cowling to side fuselage.

1.5mm

TP Screw(3x20mm) 8

Assemble the main landing gear. Cut off the surplus parts carefully along the

shaded line the and epoxy them to yhe cowling.

Drill holes at appropriate position in the wing for fetching

out the servo wire and air pipe.

Wood dowel (6x50mm)

Screw(4x35mm)

Screw(4x75mm) Screw(4x75mm)

6.2mm

Blind Nut

6.2mm

Blind Nut

Blind Nut (4mm)

Reinforcement

5mm 5mm

A = A"

Wood dowel (468x50x3mm) 2

Drill holes on the wing root accorrding to rib template.

Hook screw 2

Hook

Rib template (2mm ply)

6mm

Rib template (3mm ply)

Main wing joiner(25x350mm)

The standard sketch map when the main wing install

completion.

Epoxy the side fuselage to the mid wing steadily.

According to the reinforcement drill four holes to

appropriate position in the mid wing and set blind

nut in relevant fuselage position.

Fix the mid wing to the fuselage with the screws

as illustration.

Accessory list for the coming installation steps.

Bushing (8X6mm)

Nut (4mm)

Nut (4mm )

Wheel (75mm)

Wheel (75 mm)

Aluminum part(60x6mm)

Assemble the nose wheel.

Bushing (8X6mm)

3.2mm

Blind Nut

80mm

160mm

Washer(3x6mm)

Screw (3x40mm)

Blind Nut (3mm)

TP Screw ( 2.3x8mm)

Ply (15x15x3mm)

Clevis

Screw (2x10mm)

Nut (2mm )

Steel wire (0.5x1500mm)

Clevis

Copper joiner

Aluminum tube(3x6mm)

TP Screw (3x20mm) 4

TP Screw (2.3x12mm)

Aluminum part(60x6mm)

Nut (4mm )

Wheel (75 mm)

Washer(2x5mm)

Bushing (8X6mm)

Assmble the stabilizer to the tail of fuselage with screw.

Cut off the surplus portion carefully along the shaded line.

Glue this PVC part to appropriate position on the

stabilizer with CA glue.

Put the stabilizer to appropriate position on the fuselage

and drill holes through the PVC,stabilizer until fuselage.

Accessory list for the coming installation steps.

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