Seagull Models YAK 54 Manuale utente

Specications:

Wingspan ----------------- 64 in---------------------- 162.5 cm.

Wing Area ---------------- 846 sp.in----------------- 54.6 sq.dm.

Weight --------------------- 9.3 lbs-------------------- 4.2 kg.

Length --------------------- 61.4 in-------------------- 156 cm.

Engine size .91-1.25 cu.in- 2-4stroke / 20cc gasoline engine.

Radio System------------- 5 channel with 5 digital servos.

ASSEMBLY MANUAL

Code : SEA 387

YAK 54 ARF 20cc Instruction Manual.

ank you for choosing the YAK 54 ARF 20cc ARTF by SG MODELS. e YAK 54

ARF 20cc 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 ARF 20cc 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 ARF 20cc 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

SEA387 YAK 54 ARF 20cc

1. Fuselage

2. Wing set (2)

3. Tail set (2)

4. Canopy

5. Cowling

6. Wing tube

7. landing gear

8. Fuel tank

9. Tail wheel

10. Pushrod

11. Ep Motor box

12. Pilot

13. 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.

�20cc gasoline engine.

�Computer radio 5 channel with 5

servos.

�Glow plug to suit engine.

�Propeller to suit engine 20x8-21x10.

�Protective foam rubber for radio

system.

HINGING THE AILERON

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.

C/A Hinge

Remove each hinge from the wing panel

and aileron and place a T-pin in the center

of each hinge. Slide each hinge into the wing

panel until the T-pin is snug against the wing

panel. is will help ensure an equal amount

of hinge is on either side of the hinge line

when the aileron is mounted to the aileron.

Slide the wing panel on the aileron until

there is only a slight gap. e hinge is now

centered on the wing panel and aileron.

Remove the T-pins and snug the aileron

against the wing panel. A gap of 1/64” or

less should be maintained between the

wing panel and aileron.

YAK 54 ARF 20cc Instruction Manual.

NOTE : e hinge is constructed of a spe-

cial material that allows the C/A to wick

or penetrate and distribute throughout

the hinge, securely bonding it to the wood

structure of the wing panel and aileron.

Deect the aileron and completely saturate

each hinge with thin C/A glue. e ailerons

front surface should lightly contact the wing

during this procedure. Ideally, when the

hinges are glued in place, a 1/64” gap or less

will be maintained throughout the lengh of

the aileron to the wing panel hinge line.

Turn the wing panel over and deect the

aileron in the opposite direction from the

opposite side. Apply thin C/A glue to each

hinge, making sure that the C/A penetrates

into both the aileron and wing panel.

Using C/A remover/debonder and a paper

towel, remove any excess C/A glue that may

have accumulated on the wing or in the

aileron hinge area.

Repeat this process with the other wing

panel, securely hinging the aileron in place.

Aer both ailerons are securely hinged,

rmly grasp the wing panel and aileron to

make sure the hinges are securely glued and

cannot be pulled out. Do this by carefully ap-

plying medium pressure, trying to separate

the aileron from the wing panel. Use caution

not to crush the wing structure.

Work the aileron up and down sev-

eral times to “work in” the hinges

and check for proper movement.

Note :

CA glue

Hinge

Locate the aileron control horns. e taller

control horn is used for the ailerons, and the

shorter horn for the aps.

Use sandpaper to scu the bottom of the

aileron and ap control horns. Use a paper

towel and isopropyl alcohol to remove any

oils or debris from the control horns.

Check the t of the control horns to

the aileron and ap. ey should rest ush

against the control surface as shown.

INSTALL THE AILERONS

CONTROL HORN

Ailerons control horn

Place low-tack tape 1/32 inch (1mm)

from the control horn slot. is will pre-

vent epoxy from getting on the control

surface when the control horns are glued

in place.

Apply epoxy to the area of the control

horns that st into the slots. Use enough

epoxy so the control horns will be fully

bonded to the ed surfaces.

Remove the control horns from the

control surfaces. Apply epoxy to the slot

in the aileron and ap. Make sure the

epoxy gets into the slot for a good bond

between the surfaces and control horn.

Epoxy

YAK 54 ARF 20cc Instruction Manual.

Before the epoxy fully cures, remove

the tape from around the control horn.

is will allow the epoxy to ow around

the control horn, creating a small let

between the control horn and surface for

a ished look and secure bond.

Because the size of servos dier, you

may need to adjust the size of the precut

opening in the mount. e notch in the

sides of the mount allow the servo lead to

pass through.

Install the rubber grommets and brass

collets onto the aileron servo. Test t the

servo into the aileron servo mount.

Use dental oss to secure the connec-

tion so they cannot become unplugged.

Using a small weight (Weighted fuel

pickup works well) and thread, feed the

string through the wing as indicated.

Attach servo lead to the aileron servo.

Attach the string to the servo lead and

carefully thread it though the wing. Once

you have thread the lead throught the

wing, remove the string so it can use for

the other servo lead.

INSTALLING THE AILERON SERVOS

Maximum Servo spec.

Torque : 126.6 oz-in (9.11 kg-cm) @ 6.0V;

178 oz-in (12.82 kg-cm) @ 7.4V; 248 oz-

in (17.86 kg-cm) @ 8.4V

Tape the servo lead to the wing to pre-

vent it from falling back into the wing.

Reinstall the servo into the servo mount

and secure the servo inplace using the

wood screws provided with you radio

system.

Repeat the procedure for the other wing

half.

11.

10.

25mm

YAK 54 ARF 20cc Instruction Manual.

Repeat all the above steps for the other

wing.

65mm

INSTALLING THE AILERON PUSHROD

Please study images below.

INSTALL HINGE FOR STABILIZER

AND ELEVATOR

Please study images below.

4.8.

3.7.

40mm40mm

Epoxy

CA glue

YAK 54 ARF 20cc Instruction Manual.

10.

11.

12.

INSTALL ELEVATOR CONTROL HORN

Fiberglass control horn

Epoxy

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