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MS: 131

ASSEMBLY MANUAL
“Graphics and specifications may change without notice”.

Specifications:
Wing span ---------------------------68.9in (175cm).
Wing area ---------------1026.1sq.in (66.2sq dm).
Weight --------------------11.5-14.3lbs (5.2-6.5kg).
Length ------------------------------64.8in (164.7cm).
Engine -----------------1.2 - 1.6 cu.in -----2-stroke.
30-35 --- gasoline engine.
Radio ----------- 6 channels with 6 digital servos.
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Instruction Manual

YAK 55.

INTRODUCTION.
Thank you for choosing the YAK 55 ARTF by SEAGULL MODELS. The YAK 55 was designed
with the intermediate/advanced sport scale in mind. It is a semi scale airplane which is easy to fly
and quick to assemble. The airframe is conventionally built using balsa, plywood to make it stronger
than the average ARTF , yet the design allows the aeroplane to be kept light. You will find that most
of the work has been done for you already. The motor mount has been fitted and the hinges are preinstalled . Flying the YAK 55 is simply a joy.
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual thoroughly before starting assembly of your YAK 55. Use the parts listing below to identify
all parts.

WARNING.
Please be aware that this aeroplane is not a toy and if assembled or used incorrectly it
is capable of causing injury to people or property. WHEN YOU FLY THIS AEROPLANE YOU
ASSUME ALL RISK & RESPONSIBILITY.
If you are inexperienced with basic R/C flight we strongly recommend you contact your R/C
supplier and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training
procedures designed to help the new pilot on his way to successful R/C flight. They will also be able
to advise on any insurance and safety regulations that may apply.

KIT CONTENTS

5

5

6

5

8

1

3

2

4

9
7

2
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KIT CONTENTS
1
2
3
4
5
6
7
8
9

Fuselage
Left wing panel
Right wing panel
Canopy
Tail set
Aluminum wing tube
Scale pilot
Main landing gear
Fiberglass cowl

ADDITIONAL ITEMS REQUIRED.

HINGING THE AILERONS.
Note: Properly hinging the control surfaces on
this models is very important.Poorly
installed hinges affect the model’s
precision and control response and can
also be dangerous.
1) Sand each end of hinge point hinge
using coarse sandpaper. This will improve the
bond of the epoxy to the hinge. Apply a thin
coat of Petroleum jelly to the hinge point to
prevent the epoxy from gluing the hinge
surface.
2) Mix minute epoxy. Using a glue syringe
or toothpick, place 30-minute epoxy into one
of the hinge pockets in the aileron leading edge
of the aileron. Some epoxy should ooze out of
the pocket as the hinge is installed. If not,
remove the hinge and apply more epoxy. Wipe
away any excess epoxy with rubbing alcohol.
Continue installing hinges in the leading edge
of the aileron. The control surfaces (aileron)
will be installed after the epoxy is fully cured.

1.2-1.6 cu.in
2-stroke
30-35 gasoline engine.
Radio System required 6 channels
with 6 digital servos.
Glow plug to suit engine
Propeller to suit engine
Protective foam rubber for radio
system
Silicone fuel line
TOOLS & SUPPLIES NEEDED.
Thick cyanoacrylate glue
30 minute epoxy
5 minute epoxy
Hand or electric drill
Assorted drill bits
Modelling knife
Straight edge ruler
2mm ball driver
Phillips head screwdriver
220 grit sandpaper
90° square or builder’s triangle
Wire cutters
Masking tape & T-pins
Thread-lock
Paper towels

3) Allow the glue to fully cure for at least 6
hours.When cured, work each hinge
throughout its full motion several times.This
will break free any epoxy that may have found
its way into the hinge joint. Move the hinge
throughout its full travel until no resistance is
felt. This may take as many as 40 - 45 times.

C/A glue.

Epoxy.

3
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Instruction Manual

YAK 55.

4) Mix 30 minute epoxy or use Pace PT55 hinge glue. Place a sufficient amount of glue
in each of the hinge pockets in one wing panel.

Epoxy.

5) Press the aileron and wing together such
that less than a 1/64” hinge line gap exists
between the aileron and wing. The bevels
should virtually touch. Use a paper towel and
rubbing alcohol to wipe away any visible epoxy
around the hinges.
Note: Work the aileron up and down several
times to “work in” the hinges and check
for proper movement.

HINGING THE ELEVATOR.
Glue the elevator hinges in place using the
same techniques used to hinge the ailerons.

6) Allow the glue to fully cure for at least 6
hours.
7) When fully cured, move each control
surface throughout is travel range serveral
times to break away any epoxy in the hinge.
Be sure to deflect the surface fully.

HINGING THE RUDDER.
Glue the rudder hinges in place using the
same techniques used to hinge the ailerons.

4
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INSTALL ELEVATOR CONTROL HORN.
Fiberglass control horn.

INSTALL AILERON CONTROL HORN.
Fiberglass control horn.

Epoxy.

Epoxy.

Epoxy.

Elevator control horn.

INSTALL RUDDER CONTROL HORN.

Fiberglass control horn.
Epoxy.

Aileron control horn.

5
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Instruction Manual

YAK 55.

Thread locker glue.

Epoxy.

Epoxy.

Rudder control horn.

ENGINE MOUNT INSTALLATION.
1) Locate the items necessary to install the
engine mount included with your model. .

INSTALLING THE STOPPER ASSEMBLY.

1) Using a modeling knife, carefully cut
off the rear portion of one of the 3 nylon tubes
leaving 1/2” protruding from the rear of the
stopper. This will be the fuel pick up tube.

4x30mm.
2) Use four 4x30mm head bolts and four 4mm
washers to attach the engine mount rails to
the firewall. Tighten the screws . Make sure to
use threadlock on the screws to help prevent
them from vibrating loose.

2) Using a modeling knife, cut one length
of silicon fuel line. Connect one end of the line
to the weighted fuel pick up and the other end
to the nylon pick up tube.(The silicon tube is
not included).
3) Carefully bend the second nylon tube
up at a 45º angle. This tube is the vent tube.

A

6
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B

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6) When satisfied with the alignment of
the stopper assembly tighten the 3 x 20mm
machine screw until the rubber stopper expands and seals the tank opening. Do not
overtighten the assembly as this could cause
the tank to split.

FUEL TANK INSTALLATION.

You should mark which tube is the vent
and which is the fuel pickup when you
attach fuel tubing to the tubes in the stopper.
Once the tank is installed inside the fuselage,
it may be difficult to determine which is which.
7) Slide the fuel tank into the fuselage.
Guide the lines from the tank through the hole
in the firewall.
Vent tube.

Fuel pick up tube.

A

Fuel fill tube.

Carefully use a lighter or heat gun to
permenently set the angle of the vent tube.
Important: 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.
4) 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 falls into the tank.
5) With the stopper assembly in place,
the weighted pick-up should rest away from
the rear of the tank and move freely inside the
tank. The top of the vent tube should rest just
below the top of the tank. It should not touch
the top of the tank.

C/A glue.

Fuel tank.

8) Use balsa stick to help prevent moveable
from transferring to the fuel tank.

Balsa wood included.

Fuel tank.

B

C/A glue.

7
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Instruction Manual

YAK 55.

Vent tube.

Fuel fill tube.
Fuel pick-up tube.

2) You have to trim each axle using a tool
cutting and cut-off wheel.

9) Connect the lines from the tank to the
engine and muffler. The vent line will connect
to the muffler and the line from the clunk to the
carburetor.

Caution when cutting the axles and
wear protective goggles.

Pushrod wire.

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.
WHEEL AND WHEEL PANTS
INSTALLATION.
1) Locate the items neccessary to install
the wheel and wheel pants as shown.

m
inu
m
u
Al

r.
ea
g
g
din
n
la

Repeat steps as above to attach remaining wheel pants to the landing gear.

8
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INSTALLING THE MAIN ALUMINUM
LANDING GEAR TO FUSELAGE.

1) Using a small weight (Weighted fuel pick-up
works well) and string, feed the string through
the wing as indicated.

3) The blind nuts for securing the landing
gear are already mounted inside the fuselage.
4) Using the hardware provided, mount
the main landing gear to the fuselage.
5) Place the fuselage inverted on the workbench in a suitable stand. Set the landing gear
in place and use a screwdrive to secure the
landing gear to the fuselage using bolts
M4x20mm and washers. Make sure to use the
threadlock on the bolts so they don’t vibrate
loose.

Small weight.

String.

2) Place the servo between the mounting
blocks and space it from the hatch. Use a pencil
to mark the mounting hole locations on the
blocks.

3) Use drill bit in a pin vise to drill the mouting
holes in the blocks.

Locker glue.
.

M4x 20mm.

FUSELAGE SERVO INSTALLATION.

4) Apply 2-3 drops of thin C/A to each of the
mounting holes. Allow the C/A to cure without
using accelerator.

We recommended to use long servos arm
(70mm diameter)for all servos without throttle
servo.
Install the rubber grommets and brass
collets onto the servo. Test fit the servo into
the servo mount.
C\A glue.
Because the size of servos differ, you
may need to adjust the size of the precut opening in the mount. The notch in the sides of
the mount allow the servo lead to pass through.

5) Use dental floss to secure the connection
so they cannot become unplugged.

9
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