Seagull Models YAK 54 User manual

1
Specications:
Wingspan --------------- 73 in (185.0 cm)
Wing Area -------------- 996.3 sp.in (64.3 dm²)
Weight ------------------ 11.5-12.3 lbs (5.2-5.6 kg)
Length ------------------ 65.7 in (167.0 cm)
Engine ------------------ 35-40cc
Servo-------------------- 5 channels 6 servos
Motor 180/ 3000-3500watt/ ESC 80A-120A/ Lipo
12s 3300-4200mAh
Electric propeller 20x8-21x10
ASSEMBLY MANUAL
Code : SEA 360

YAK 54 Instruction Manual.
2
1
2
2
3
3
4
ank you for choosing the YAK 54 ARTF by SG MODELS. e YAK 54 was designed
with the intermediate/advanced sport yer in mind. It is a semi scale airplane which is easy
to y and quick to assemble. e 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 nd that most of the work has been done for you already. e motor mount
has been tted and the hinges are pre-installed. Flying the YAK 54 is simply a joy.
is instruction manual is designed to help you build a great ying aeroplane. Please read
this manual throughly before starting assembly of your YAK 54 Use the parts listing below
to indentify all parts.
If you are inexperienced with basic R/C ight we strongly recommend you contact your
R/C supplier and join your local R/C model Flying Club. R/C Model Flying Clubs oer a
variety of training procedures designed to help the new pilot on his way to successful R/C
ight. ey will also be able to advise on any insurance and safety regulations that may
apply.
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 & REPONSIBILITY.
INTRODUCTION
WARNING
KIT CONTENTS
5
6
7
8
9

3
1.
2.
KIT CONTENTS
SEA360 YAK 54
1. Fuselage
2. Wing set (2)
3. Tail set (2)
4. Cowling
5. Wing tube
6. landing gear
7. Fuel tank
8. Tail whee
9. Spinner
ADDITIONAL ITEMS REQUIRED
TOOLS & SUPPLIES NEEDED
in cyanoacrylate glue.
Medium 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.
read-lock.
Paper towels.
�35-40cc gasoline engine.
�Computer radio 5 channel with 6
servos.
�Glow plug to suit engine.
�Propeller to suit engine 20x8-21x10.
�Protective foam rubber for radio
system.
HINGING THE AILERON
Prepare the aileron hinges by scung
the area that will be inserted into the
wing or flying surface with medium grit
sand paper. Be careful not to remove
too much material. Use isopropyl al-
chol, and a paper towel to remove any
excess debris that remains on the hinges.
Mix a sucient amount of 30-min-
ute epoxy in a cup, and with a tooth-
pick, smear epoxy in the hinge pockets
of the wing panel and aileron. Slowly
and carefully, insert each hinge into the
wing panel. Partially remove and re-
install the hinge to ensure that you’ve
completely coated it with glue. Clean up
any excess epoxy with isopropyl alco-
hol, and tape the aileron in place to cure.
Note : e control surfaces, including the ailer-
ons, elevators, and rudder, are prehinged with
hinges installed, but the hinges are not glued in
place. It is imperative that you properly adhere
the hinges in place per the steps that follow us-
ing a high-quality thin C/A glue.
Carefully remove the aileron from one
of the wing panels. Note the position of
the hinges.

YAK 54 Instruction Manual.
4
5.
6.
4.
7.
8.
9.
3.
Hinge
Press the aileron and wing together such
that less than a 1/64” hinge line gap exists
between the aileron and wing. e bevels
should virtually touch. Use a paper towel
and rubbing alcohol to wipe away any
visible epoxy around the hinges.
Allow the glue to fully cure for at least 6
hours.
When fully cured, move each control
surface throughout is travel range server-
al times to break away any epoxy in the
hinge. Be sure to deect the surface fully.
Note : Work the aileron up and down sev
eral times to “work in” the hinges and check
for proper movement.
Epoxy
Epoxy

5
INSTALL THE AILERONS
CONTROL HORN
1.
2.
3.
4.
Fiberglass control horn
Prepare the aileron control horns by sand-
ing the section that extends into the control
surface with medium grit sand paper. Use iso-
propyl alcohol and a paper towel to remove
any excess debris from the control horn.
5.
6.
7.
Epoxy
Epoxy

YAK 54 Instruction Manual.
6
INSTALLING THE AILERON SERVOS
Minimum servo spec.
Torque : 333.00 oz-in (23.98 kg-cm) @
6.0V; oz-in (29.02 kg-cm) @ 7.4V
Attach the extension to the servo lead
and secure with Safety Clip, safety wire,
tape or other method. Ensure the plugs
will not come apart from vibration or
light tension.
Fasten the pull string from the servo
hole to the male plug of the servo exten-
sion.
Layout the servo on the wing to test fit
the installation and ensure servo lead is
he correct length.
NOTE : servos arm for aileron is not
provided from manufacturer.
8.
1.
2.
3.
4.
Fiberglass control horn
Epoxy
Please study images below.
5.

7
6.
7.
8.
9.
Install servo with servo mounting
screws.
in CA
38mm
INSTALLING THE AILERON PUSHROD
Please study images below.
1.
2.
3.

YAK 54 Instruction Manual.
8
Repeat all the above steps for the other
wing.
INSTALL HINGE FOR STABILIZER
AND ELEVATOR
4.
1.
3.
2.
4.
6.
5.
7.
95mm
Please study images below.
Epoxy
Epoxy

9
INSTALL ELEVATOR CONTROL HORN
8.
6.10.
1.
2.
5.9.
7.
Fiberglass control horn
Epoxy

YAK 54 Instruction Manual.
10
7.
8.
9.
10.
3.
4.
5.
6.
Epoxy
Epoxy
You cut horizontal tail sevor hole.

11
15.
16.
17.
11.
12.
13.
14.
Minimum servo spec.
Torque : 333.00 oz-in (23.98 kg-cm) @
6.0V; oz-in (29.02 kg-cm) @ 7.4V

YAK 54 Instruction Manual.
12
5.
1.
2.
3.
2.
3.
4.
1.
INSTALL HINGE FOR RUDDER AND
FIN
Please study images below.
INSTALL RUDDER CONTROL HORN
Please study images below.
Epoxy
Epoxy

13
8.4.
5.
6.
7.
2.
1.
3.
HORIZONTAL TAIL INSTALLATION
Please study images below.

YAK 54 Instruction Manual.
14
4.3.
5.
4.
1.
5.
1.
2.
ELEVATOR PUSHROD INSTALLATION.
Please study images below.
NSTALL RUDDER CABLE AND SERVO
NOTE : servos arm is not provided
from manufacturer.
130mm
38mm

15
4.
5.
6.
7.
Tape the rudder balance tab to the top
leading edge of the vertical n in the
neutral position as shown. is ensures
the rudder is straight when the cables are
attached.
read the rudder cable through a
brass swage tube, then the threaded co
pler, and back through the brass swage
tube on both sides. Pull light tension on
the cable through the coupler on both
sides as shown.
Loop the cable back through the brass
swage tube and tighten the second loop
through the brass swage tube as shown.
Crimp the brass tube with a crimping
tool or pliers.
Cut o excess cable as shown.
3.
2.

YAK 54 Instruction Manual.
16
Feed one rudder cable through the pre
installed cable exit tube in the rear of the
fuse toward the front of the fuse. Repeat
for other side.
read cable through brass swage tube.
read cable through the threaded
coupler hole, and back through the brass
swage tube as shown.
Loop the cable back through the brass
swage tube and pull tight.
8.
9.
12.
13.
14.
10.
11.

17
Crimp the brass swage tube with a
crimping tool or pliers.
Locate items necessary to install
tailwheel.
Cut o excess cable as shown.
15.
18.
19.
1.
2.
16.
17.
TAILWHEEL INSTALLATION
Epoxy
3.
Epoxy

YAK 54 Instruction Manual.
18
7.
4.8.
5.9.
6.INSTALLING THE MAIN LANDING
GEAR TO FUSELAGE
1.
Please study images below.
Loctite
3x15mm

19
2.
3.
4.
5.
6.
7.
3x4mm
8.
9.

YAK 54 Instruction Manual.
20
12.
13.
10.14.
11.
16.
15.
17.
Loctite
3x10mm
3x4mm
3x10mm