Seagull Models YAKOVLEV YAK 3 Manuale utente

ASSEMBLY MANUAL

Specications:

Wingspan---------------63.0 in (160 cm).

Wing area---------------723.9 sq.in ( 46.7sq.dm).

Weight-------------------11.5 lbs ( 5.2 kg).

Length-------------------55.4 in (140.6 cm).

Engine-------------------20cc

Radio--------------------7 channels with 7 servos.

“ Graphics and specications may change without notice ”.

YAKOVLEV YAK 3

- 63 inch

Code: SEA270

YAK 3 Instruction Manual.

ank you for choosing the YAK 3 ARF by SG MODELS. e YAK 3 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 ARF, 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 3 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 3 . Use the parts listing below to

indentify all parts.

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.

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.

INTRODUCTION.

WARNING.

KIT CONTENTS.

SEA270 YAK 3

1. Fuselage

2. Wing set

3. Tail set

4. Canopy

5. Cowling

6. Pilot

ADDITIONAL ITEMS REQUIRED.

TOOLS & SUPPLIES NEEDED.

HINGING THE FLAP.

�20cc gasoline engine.

�Computer radio with 9 servos.

�Glow plug to suit engine.

�Propeller to suit engine.

�Protective foam rubber for radio

system.

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.

2x10mm.

YAK 3 Instruction Manual.

HINGING THE AILERON.

Note : e control surfaces, including the ai-

lerons, elevators, and rudder, are prehinged

with hinges installed, but the hinges are not

glued in place. It is imperative that you prop-

erly adhere the hinges in place per the steps

that follow using a high-quality thin C/A glue.

1) Carefully remove the aileron from one

of the wing panels. Note the position of the

hinges.

2) 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.

3) 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. Re-

move 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.

Hinge.

4) Deect the aileron and completely satu-

rate each hinge with thin C/A glue. e ailer-

ons 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.

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.

in CA.

5) 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.

6) Using C/A remover/debonder and a pa-

per towel, remove any excess C/A glue that

may have accumulated on the wing or in the

aileron hinge area.

7) Repeat this process with the other wing

panel, securely hinging the aileron in place.

8) 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 :

INSTALL THE AILERONS

CONTROL HORN.

Fiberglass control horn

Epoxy.

Aileron control horn.

INSTALL FLAP CONTROL HORN.

Install the ap control horn using the

same method as same as the aileron con-

trol horns.

Epoxy.

Flap control horn.

YAK 3 Instruction Manual.

WING ASSEMBLY.

Please see below pictures.

Attach the aluminum tube into wing.

INSTALLING THE AILERON SERVOS.

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.

Note : to be convenience for trans-

ports ,you don’t need to do this steps.

1) Using a small weight (Weighted fuel

pick-up works well) and string, feed the

string through the wing as indicated.

2) Place the servo between the mounting

blocks and space it from the hatch. Use a

pencil to mark the mounting hole loca-

tions on the blocks.

3) Use drill bit in a pin vise to drill the

mouting holes in the blocks.

4) Apply 2-3 drops of thin C/A to each

of the mounting holes. Allow the C/A to

cure without using accelerator.

C/A glue.

5) Use dental oss to secure the connec-

tion so they cannot become unplugged.

6) Secure the servo to the aileron hatch

using Phillips screwdriver and the screws

provided with the servo.

7) Apply 1-2 drops of thin C/A to each of

the mounting tabs. Allow the C/A to cure

without using accelerator.

C/A glue.

8) Remove the string from the wing at

the servo location and use the tape to at-

tach it to the servo extension lead. Pull

the lead through the wing and remove

YAK 3 Instruction Manual.

9) Set the aileron hatch in place and use a

Phillips screw driver to install it with four

wood screws.

2x10mm.

INSTALLING THE FLAP SERVO.

Repeat the procedure for the ap servo.

AILERON PUSHROD

INSTALLATION.

Please see below pictures.

Use a felt tip pen to mark the wire where

it crosses the hole. Use a pair of pliers to

put a shrp 90-degree bend in the wire at

the mark.

Mark.

Bend at the mark

8mm

M2 lock nut.

Metal clevis.

Snap keeper.

Servo arm.

Fuel tubing.

Hex Nut.

Nylon Snap keeper.

INSTALLING THE FLAP PUSHROD.

LIGHT COVER.

Repeat the procedure for the aileron

pushrod.

INSTALLING RETRACTABLE

LANDING GEAR.

Locate items necessary to install Sprin

Landing Gear.

You use this fork set JP ER-120-80degree.

YAK 3 Instruction Manual.

3x20mm.

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