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Instruction Manual

version

SPECIFICATION
- Wingspan: 1684mm (66.3 in)
- Length: 1605mm (63.1 in)
- Flying weight: 4700-5200 gr
- Wing area: 54.7 dm2
- Wing loading: 87g/dm2
- Wing type: Naca airfoils
- Covering type: Genuine ORACOVER®
- Gear type: Aluminum Hi-grade for main
gear and spring wire for tail gear (included)
- Spinner size: Plastic 70mm (included)
- Radio: 4 channel minimum (not included)
- Servo: 6 standard hitorque servo: 2 aileron;
2 elevator; 1 rudder; 1 throttle (not included)
- Recommended receiver battery:
4.8-6V / 1200-2000mAh NiMH (not included)
- Servo mount: 21mm x 42 mm
- Propeller: suit with your engine

- Engine: .120 / 2-stroke or .120/4-stroke glow
engine or 20cc gas engine (not included)
- Motor: brushless outrunner 2000-2400 W,
450 KV (not included)
- Gravity CG: 137 mm (5.3in) Back from the
leading edge of the wing, at the fuselage
- Control throw Ailerons: Low: 11mm up/down,
10% expo; High: 13mm up/down, 10% expo
- Control throw Elevators: Low: 11mm up/down,
12% expo; High: 13mm up/down, 12% expo
- Control throw Rudder: Low: 35mm right/left,
15% expo; High: 60mm right/left, 15% expo
- Experience level: Intermediate
- Plane type: Scale Aerobatic
RECOMMENDED MOTOR AND BATTERY SET UP
- Motor: RIMFIRE .120 (not included)
- Lipo cell: 6-12 cells / 4000 – 5500mAh
(not included)
- Esc: 80-100A (not included)

YAK54 MK2

GP/EP size.120/20cc SCALE 1:4 ¾ ARF

BASIC CONNECTION FOR AIRPLANE AND ADJUSTMENT OF SERVOS

FOR YOUR RADIO INSTALLATION

Example of connection

For more information, refer to radio system instruction manual.
Follow instruction manual of Engine and Battery.

Y-Harness

Switch

Receiver

Engine

Throttle Servo

Y-Harness

Battery (Receiver)

Rudder

Elevator Servo

Elevator

Elevator Servo

Elevator

Aileron Servo

Aileron

Rudder Servo

YAK54 MK2

Instruction Manual

Elevator Control

Aileron Control

11mm
11mm

Rudder Control

35mm
35mm

11mm
11mm

FLIGHT PREPARATION PRE FLIGHT CHECK

1. Completely charge your transmitter and receiver

batteries before your first day of flying.

2. Check every bolt and every glue joint in your

plane to ensure that everything is tight and well

bonded.

3. Double check the balance of the airplane
4. Check the control surface
5. Check the receiver antenna . It should be fully

extended and not coiled up inside the fuselage.

6. Properly balance the propeller.

3. Turn the airplane upside down. Place your fingers

on the masking tape and carefully lift the plane.

4. If the nose of the plane falls, the plane is nose

heavy. To correct this first move the battery pack

further back in the fuselage. If this is not possible

or does not correct it, stick small amounts of lead

weight on the fuselage under the horizontal

stabilizer. If the tail of the plane falls, the plane is

tail heavy. To correct this, move the battery and

receiver forward or if this is not possible, stick

weight into the firewall. When balanced correctly,

the airplane should sit level or slightly nose down

when you lift it up with your fingers.

BALANCING

1. It is critical that your airplane be balanced correctly.

Improper balance will cause your plane to lose

control and crash.

THE CENTER OF GRAVITY IS LOCATED 137mm

(5.3 in) BACK FROM THE LEADING EDGE OF

THE WING, AT THE FUSELAGE. BALANCE A

PLANE UPSIDE DOWN WITH THE FUEL TANK

EMPTY.

2. Mount the wing to the fuselage. Using a couple of

pieces of masking tape, place them on the top

side of the wing 137mm (5.3 in) back from the

leading edge, at the fuselage sides.

YAK54 MK2

Instruction Manual

CONTROL THROWS

1. We highly recommend setting up a plane using

the control throws listed.

2. The control throws should be measured at the

widest point of each control surface.

3. Check to be sure the control surfaces move in

the correct directions.

LATERAL BALANCE

After you have balanced a plane on the C.G.

You should laterally balance it. Doing this will

help the airplane track straighter.

1. Turn the airplane upside down. Attach one loop

of heavy string to the engine crankshaft and

one to the tail wheel wire. With the wings level,

carefully lift the airplane by the string. This may

require two people to make it easier.

2. If one side of the wing fall, that side is heavier

than the opposite. Add small amounts of lead

weight to the bottom side of the lighter wing

half's wing tip. Follow this procedure until the

wing stays level when you lift the airplane.

Aileron 11mm up

11mm down

Elevator 11mm up

11mm down

Rudder 35mm right

35mm left

Low rate:

137mm

(5.3 in)

TOOLS AND SUPPLIES NEEDED.

• Medium C/A glue

• 30 minute epoxy

• 6 minute epoxy

• Hand or electric drill

• Assorted drill bits

• Modeling knife

• Straight edge ruler

• 2 bender plier

• Wire cutters

• Masking tape

• Thread lock

• Paper towels

• Rubbing alcohol

SUGGESTION

To avoid scratching your new airplane, do not unwrap

the pieces until they are needed for assembly. Cover

your workbench with an old towel or brown paper,

both to protect the aircraft and to protect the table.

Keep a couple of jars or bowls handy to hold the

small parts after you open the bag.

NOTE:

Please trial fit all the parts. Make sure you have the

correct parts and that they fit and are aligned properly

before gluing! This will assure proper assembly. The

YAK54 MK2 GP/EP size.120/20cc SCALE 1:4 ¾

ARF is hand made from natural materials, every

plane is unique and minor adjustments may have to

be made. However, you should find the fit superior

and assembly simple.
The painted and plastic parts used in this kit are fuel

proof. However, they are not tolerant of many harsh

chemicals including the following: paint thinner, C/A

glue accelerator, C/A glue debonder and acetone. Do

not let these chemicals come in contact with the

colors on the covering and the plastic parts.

SAFETY PRECAUTION:

• This is not a toy

• Be sure that no other flyers are using your radio

frequency.

• Do not smoke near fuel

• Store fuel in a cool, dry place, away from

children and pets.

• Wear safety glasses.

• The glow plug clip must be securely attached to

the glow plug.

• Do not flip the propeller with your fingers.

• Keep loose clothing and wires away from the propeller.

• Do not start the engine if people are near. Do not

stand in line with the side of the propeller.

• Make engine adjustments from behind the propeller

only. Do not reach around the spinning propeller.

PREPARATIONS

Use a covering iron with a covering sock on

high heat to tighten the covering if necessary.

Apply pressure over sheeted areas to

thoroughly bond the covering to the wood.

INSTALLING THE AILERONS AND Flaps

1. Test fit the ailerons to the wing with the hinges.

If the hinges don’t remain centered, stick a pin

through the middle of the hinge to hold it in

position.

TEMPORARY PIN

TO KEEP HINGE

CENTERED

2. Apply six drops of thin CA to the top and bottom

of each hinge. Do not use CA accelerator. After

the CA has fully hardened, test the hinges by

pulling on the aileron.

YAK54 MK2

Instruction Manual

< Bottom view >

Main Wing

Aileron

YAK54 MK2

Instruction Manual

INSTALLING THE AILERONs SERVOS

1. Install the rubber grommets and brass eyelets onto

the aileron servo.

2. Using a modeling knife, remove the covering from over

the servo box.

3. Place the servo into the servo box. Center the servo

and drill pilot holes through the block of wood for

each of the four mounting screws provided with the

servo.

4. Using the thread as a guide and using masking

tape, tape the servo lead to the end of the

thread: carefully pull the thread out. When you

have pulled the servo lead out, remove the

masking tape and the servo lead from the

thread.

5. Repeat step # 2 - # 5 to install the second aileron

servo in the opposite wing half.

Make certain the hinges are adequately secured with glue. If

they come loose in flight accidents may result.

Secure nylon hinges with instant glue, being careful

not to glue the wing and airleron together.

Apply instant glue (CA glue, super glue).

Align the center line of main wing with aileron.

Cut away film only. here
Supplied with the servo

2mm

Must be purchased

separately!
Assemble left and right

sides the same way

Cut off shaded portion

Set all scerws securely. If they come off during

flight you will lose control of your aircraft!

Tie the string.

Pull out servo

cord with string.

Warning!

Aileron

1. The stopper has been pre-assembled at the

factory.

2. Using a modeling knife, cut one length of silicon

fuel line (the length of silicon fuel line is

calculated by how the weighted clunk should

rest about 5mm away from the rear of the tank

and move freely inside the tank). Connect one

end of the line to the weighted clunk and the

other end to the nylon pick up tube in the

stopper.

3. Carefully bend the second nylon tube up at a 45

degree angle (using a cigarette lighter). This

tube will be the vent tube to the muffler.

4. Carefully bend the third nylon tube down at a 45

degree angle (using a cigarette lighter). This

tube will be vent tube to the fueling valve.

When the stopper assembly is installed in the

tank, the top of the vent tube should rest just

below the top surface of the tank. It should not

touch the top of the tank.

5. Test fit the stopper assembly into the tank. It

may be necessary to remove some of the

flashing around the tank opening using a

modeling knife. If flashing is present, make

sure none of it falls into the tank.

6. When satisfied with the alignment of the stopper

assembly tighten the 3mm x 20mm machine

screw until the rubber stopper expands and

seals the tank opening. Do not over tighten the

assembly as this could cause the tank to split.

INSTALLING THE Fuel Tank

YAK54 MK2

Instruction Manual

7. Using a modeling knife, cut 3 lengths of fuel line

150mm long. Connect 2 lines to the 2 vent

tubes and 1 line to the fuel pickup tube in the

stopper.

8. Feed three lines through the fuel tank

compartment and through the pre-drilled hole in

the firewall. Pull the lines out from behind the

engine, while guiding the fuel tank into place.

Push the fuel tank as far forward as possible,

the front of the tank should just about touch the

back of the firewall.

Blow through one of the lines to ensure the fuel

lines have not become kinked inside the fuel

tank compartment. Air should flow through

easily.

Do not secure the tank into place permanently

until after balancing the airplane. You may

need to remove the tank to mount the battery in

the fuel tank compartment.

9. Secure the fuel tank.

INSTALLING THE THROTTLE PUSHROD SERVO

1. Place the engine into the engine mount and align it

properly with the front of the cowling.

If your engine is equipped with a remote needle

valve, we suggest installing it into the engine at

this time.

2. Slide the pushrod housing through the hole in the

firewall, through the hole in the forward bulkhead,

and into the servo compartment.

3. Apply epoxy glue to the pushrod housing where it

exits the firewall and where it passes through the

forward bulkhead. This will secure the housing in

place.

4. Using a modeling knife, cut off the nylon pushrod

housing 26mm in front of the servo tray.

Silicone Tube

Zip tie

Fuel Tank

YAK54 MK2

Instruction Manual

INSTALLING THE ENGINE

Locate the long piece of wire used for the throttle

pushrod. One end of the wire has been pre-bend

in to a "Z" bend at the factory. This "Z" bend

should be inserted into the throttle arm of the

engine when the engine is fitted onto the engine

mount. Fit the engine to the engine mount using

the screws provided.

Must be purchased

separately!

Nut

4x30mm Screw

4mm

4mm Washer

Temporarily install the engine and

make a hole for the throttle rod by

aligning with the position of the

throttle lever.

Throttle rod

PP Pipe

4x30mm

4mm

145mm

Throttle Rod

INSTALLING THE SWITCH

1. The switch should be mounted on the fuselage

side, opposite the muffler, close enough to the

receiver so the lead will reach. Use the face plate

of the switch cut out and locate the mounting

holes.

2. Cut out the switch hole using a modeling knife.

Use a 2mm drill bit and drill out the two mounting

holes through the fuselage side.

3. Secure the switch in place using the two machine

screws provided with the radio system.

INSTALLING THE RECEIVER AND BATTERY

1. Plug the servo leads and the switch lead into the

receiver. You may want to plug an aileron

extension into the receiver to make plugging in the

aileron servo lead easier when you are installing

the wing. Plug the battery pack lead into the

switch.

2. Wrap the receiver and battery pack in the protective

foam to protect them from vibration. Use a rubber

band or masking tape to hold the foam in place.

Do not permanently secure the receiver and battery

until after balancing the model.

INSTALLING THE ELECTRIC MOTOR ( EP VERSION )

YAK54 MK2

Instruction Manual

4mm Washer

4mm Spring Washer

4 x 70mm Cap Screw

4 x 35mm Cap Screw

4x35mm

White glue

Must be purchased

separately!

Switch

Off

Foam Pad

Receiver Tape

Foam Pad

Tape

Battery

Must be purchased

separately!

YAK54 MK2

Instruction Manual

White glue

< Check the

motor rotation >

When rotating clock wise, charge the

connection of 2 wires.

Velcro

Battery Cord

4x70mm

4mm

Electric Speed Controller

Open and Close

Top Hatch

Battery

Electric Speed Controller

VERTICAL STABILIZER INSTALLATION

Installing the rudder using C.A glue as

installing the aileron.

Align the center line of vertical fin with rudder.

Secure nylon hinges with instant glue, being

careful vertical fin and rudder.

YAK54 MK2

Instruction Manual

Align the center line of horizontal tail

with elevator.
Cut away film only here

Secure nylon hinges with instant glue,

being careful tail wing and elevator.

Make certain plane is aligned

accurately per the diagram.

A mis-aligned plane can fly

erraticaliy and cause accidents.

Warning!

Cut off shaded portion

Apply epoxy glue

Apply instant glue

(CA glue, super glue).

90 Degree

EXPLODED VIEW

3mm

3x10mm(TP)

2mm

2x10mm

4x4mm

3x25mm

4x30mm

4mm

4x70mm

4mm

3x15mm

3x12mm

3mm

4x20mm

3x12mm

3x25mm

3x20mm

3mm

Cut off shaded portion

YAK54 MK2

Instruction Manual

INSTALLING THE Tail wheel

3 x 12mm TP Screw

3 x 15mm Cap Screw

3mm Spring Washer

Spring

Must be purchased

separately!

3x12mm

Top Hatch

Silicone

Open and close

INSTALLING THE ENGINE MOUNT

Apply threadlocker

(screw cement).

4 x 30mm Screw

4mm Washer

4mm Spring Washer

4x30mm

4mm

Engine Mount

YAK54 MK2

Instruction Manual

3x15mm

Spring

YAK54 MK2

Instruction Manual

Cut off shaded portion

Assemble left and right

sides the same way

Nut

3mm

< Bottom view >

3 x 25mm Cap Screw

85mm Push rod

3 x 12mm Screw

Aileron

INSTALLING THE AILERON LINKAGES

1. Install the control horn into the aileron.
2. Locate the metal rod wire, screw the plastic link ball

onto the threaded end of the wire. Tighten the nut

against, and then install the metal M3 clevis to the

other side of the pushrod wire.

3. Plug the aileron servo into the receiver and center

the servo. Install the servo arm onto the servo. The

servo arm should be perpendicular to the servo and

point toward the middle of the wing.

4. Center the aileron and hold it in place using a

couple of pieces of masking tape. Adjust the

linkage until the aileron and the servo arm are

both centered and then tighten the nut against.

Remember use thread locking compound to

secure.

5. Repeat step 1 - step 4 for the second aileron

linkage.

YAK54 MK2

Instruction Manual

4mm

5mm

4x20mm

HORIZONTAL STABILIZER INSTALLATION

1. Using a modeling knife, cut away the covering

from the fuselage for the stabilizer and remove it.

2. Remove the covering from the stabilizer.

When cutting through the covering to remove it,

cut with only enough pressure to only cut

through the covering it's self. Cutting into the

balsa structure may weaken it. This could lead

to possible failure during flight.

3. Attach the wing to the fuselage as picture.
4. Test the position of the elevator and adjust it as

shown.

5. When you are sure that everything is aligned

correctly, mix up a generous amount of 30 minute

epoxy. Apply a thin layer to the bottom and to the

top of the stabilizer mounting area and to the

stabilizer mounting platform sides in the fuselage.

Insert the stabilizer in place and re-align. Double

check all of your measurements one more time

before the epoxy cures. Remove any excess epoxy

using a paper towel and rubbing alcohol and hold the

stabilizer in place with T-pins or masking tape.

6. After the epoxy has fully cured, remove the masking

tape or T-pins used to hold the stabilizer in place and

carefully inspect the glue joints. Use more epoxy to fill

in any gaps that were not filled previously and clean

up the excess using a paper towel and rubbing

alcohol.

7. Repeat step 1 - step 2 from the installing aileron for

the installing elevator.

YAK54 MK2

Instruction Manual

3x12mm Screw

3 x 25mm Cap Screw

Nut

3mm

Must be purchased separately!

Cut off shaded portion

Pay close attention here

Apply threadlocker

(screw cement).

3x12mm

3mm

Cable rod

Aluminum ball

INSTALLING THE RUDDER LINKAGES

The rudder is controlled by two metal cables.

Install the rudder linkages and cables as below.

1. Use a hobby knife to remove the covering from

the openings for the rudder control cables.

2. The rudder has a block wood plate for mounting

the control horn. Two control horn in positioned

on both side rudder (left and right).

3. Install the control horn to the rudder.
4. Slide a crimp onto the cable, then pass the

cable through the threaded cable end. Pass

the cable back into the crimp and use crimping

pliers to secure the crimp to the cable. Guide

the cable into the fuselage to the position for

the rudder servo.

5. Thread the metal connector to the link ball.
6. Center the rudder servo using the radio and

install the servo arm. Attach the metal clevis to

the rudder servo arm.

7. Slide a crimp onto the cable, then pass the

cable through the threaded cable end. Pass

the cable back into the crimp and use crimping

pliers to secure the crimp to the cable.

8. Thread the metal connector to the metal clevis.
9. Attach the clevis to the rudder servo. There

should be light tension on each of the wires

when installed properly.

Note:

Remember use thread locking compound

to secure.

3x12mm

Cable

3x25mm

YAK54 MK2

Instruction Manual

Rudder servo

3 x 12mm Screw

3 x 20mm Cap Screw

Nut

3mm

Cable rod

INSTALLING THE ELEVATOR SERVO

1. Remove the covering from both size of the

fuselage.

2. Install two servo to the fuselage as shown.

3. Repeat these step as installing the aileron

control horn

INSTALLING THE ELEVATOR LINKAGES

. Repeat these step as installing the aileron

linkage

120mm Push rod

3x20mm

Main Gear Dimensional Detail

TAIL Gear Dimensional Detail

13.0

30.0

270.1

19.0

49.1

25.0 9.0

3.2

16.0

137.7

49.2

25.0

17.0

24.0

167.7

205.7

40.0

13.0

17.0

24.0

4.0

12.0

YAK54 MK2

Instruction Manual

Must be purchased separately!

Cut off shaded portion

Pay close attention here

YAK54 MK2

Instruction Manual

Apply threadlocker

(screw cement).

Elevator rod

3x12mm

Aluminum ball

Apply threadlocker (screw cement).

Cut off shaded portion

Ensure smooth, non-binding movement

when assembling

Must be purchased separately!

3. Slide the adjustable metal connector / servo arm

assembly over the plain end of the pushrod wire.

Position the throttle stick and the throttle trim at

their lowest positions.

4. Manually push the carburator barrel fully closed.

Angle the arm back about 45 degree from center

and attach the servo arm onto the servo. With the

carburator barrel fully closed, tighte the set screw

in the adjustable metal connector.

5. Remove the excess throttle pushrod wire using

wire cutters and install the servo arm retaining

screw.

INSTALLING THE THROTTLE

1. Install one adjustable metal connector through

the third hole out from the center of one servo

arm, enlarge the hole in the servo arm using a

2mm drill bit to accommodate the servo

connector. Remove the excess material from

the arm.

After installing the adjustable metal connector

apply a small drop of thin C/A to the bottom nut.

This will prevent the connector from loosening

during flight.

2. Plug the throttle servo into the receiver and turn on

the radio system. Check to ensure that the throttle

servo output shaft is moving in the correct

direction. When the throttle stick is moved forward

from idle to full throttle, the throttle barrel should

also open and close using this motion. If not,

reverse the direction of the servo, using the

transmitter.

OS 120 AX

YAK54 MK2

Instruction Manual

DLE 20

Connector

Must be purchased

separately!

YAK54 MK2

Instruction Manual

INSTALLING THE SPINNER

Install the spinner back-plate, propeller and

spinner cone. The spinner cone is held in place

using two screws.

The propeller should not touch any part of the

spinner cone. If it dose, use a sharp modeling

knife and carefully trim away the spinner cone

where the propeller comes in contact with it.

3x12mm

Spinner

Propeller

3x10mm

3x12mm TP Screw

Adjust the throttle input
(transmitter throttle stick),
throttle trim movement and
the carburattor opening to the
suitable position and screw
in the 4x4mm set screw.

YAK54 MK2

Instruction Manual

Throttle Servo

MOUNTING THE COWL

1. Remove the muffler and needle valve assembly

from the engine. Slide the fiberglass cowl over the

engine.

2. Measure and mark the locations to be cut out for

engine head clearance, needle valve, muffler.

Remove the cowl and make these cutouts using a

rotary tool with a cutting disc and a rotary sanding

drum attachment.