Seagull Models YAK 52 User manual

YAK 52

“Graphics and specifications may change without notice”.

MS:119

ASSEMBLY MANUAL

Specifications:

Wingspan----------------------------63.4in(161cm).

Wingarea-----------------689.8sq.in(44.5sqdm).

Weight------------------------9.3-10.1lbs(4.2-4.6kg).

Length------------------------------51.7in(131.3cm).

Engine ------------------0.91cu.in---------2-stroke.

1.20cu.in ---------4-stroke.

Radio-------------------6channelswith8 servos.

Retractslandinggear(included).

YAK 52.Instruction Manual.

INTRODUCTION.

ThankyouforchoosingtheYAK52ARTFbySEAGULLMODELS.The YAK52 wasdesignedwith

the intermediate/advanced sport flyer in mind. It is a semi scale airplane which is easy to fly and

quicktoassemble.Theairframeisconventionallybuiltusingbalsa,plywoodtomakeitstrongerthan

theaverageARTF,yetthedesignallowstheaeroplanetobekeptlight.Youwillfindthatmostofthe

workhasbeendoneforyoualready.Themotormounthasbeenfittedandthehingesarepre-installed

. Flying the YAK 52 is simply a joy.

This instruction manual is designed to help you build a great flying aeroplane. Please read this

manualthoroughlybeforestartingassemblyofyour YAK52 .Usethepartslistingbelowtoidentify

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.

IfyouareinexperiencedwithbasicR/CflightwestronglyrecommendyoucontactyourR/Csupplier

and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training

proceduresdesignedtohelpthenew pilotonhisway tosuccessfulR/Cflight. Theywillalsobeable

to advise on any insurance and safety regulations that may apply.

KIT CONTENTS

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ADDITIONAL ITEMS REQUIRED.

0.91 2-stroke.

1.20 4-stroke.

Computer radio with 8 servos.

Glow plug to suit engine.

Propeller to suit engine.

Protective foam rubber for radio

system.

Siliconefuel line.

TOOLS & SUPPLIES NEEDED.

Thick cyanoacrylate glue.

30 minute epoxy.

5 minute epoxy.

Hand or electric drill.

Assorted drill bits.

Modellingknife.

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.

The control surfaces, including the

ailerons, 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 using a high-quality

thin C/A glue.

2)Removeeachhingefrom the wing panel

and aileron and place a T-pin in the center of

each hinge. Slide each hinge into the aileron

untiltheT-pin is snugagainst the aileron.This

will help ensure an equal amount of hinge is

oneitherside ofthehingeline whentheaileron

is mounted to the wing panel.

HINGING THE AILERONS .

Note:

1) Carefully remove the aileron from one

of the wing panels. Note the position of the

hinges.

Hinge.

3) Slide the aileron on the wing panel until

there is only a slight gap. The 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

shouldbemaintainedbetweenthewingpanel

andaileron.

T-pin.

1 Fuselage

2 Left wing panel

3 Right wing panel

4 Tail set (2)

5 Canopy

6 Aluminum wing tube

7 Fiberglass cowl

8 Retracts landing gear

9 EP conversion pack

10 Hardware bag included

11 Retract covers

12 Wing fillet

KIT CONTEN.TS

YAK 52.Instruction Manual.

8)After both ailerons are securelyhinged,

firmly grasp the wing panel and aileron to

make sure the hinges are securely glued and

cannot be pulled out. Do this by carefully

applying medium pressure, trying to separate

the aileron from the wing panel. Use caution

not to crush the wing structure.

7) Repeat this process with the other wing

panel, securely hinging the aileron in place.

6) Using C/A remover/debonder and a

papertowel,removeanyexcessC/Agluethat

may have accumulated on the wing or in the

aileronhinge area.

5)Turnthe wing panel over and deflect the

aileron in the opposite direction from the

opposite side. Apply thin C/A glue to each

hinge,making surethattheC/Apenetratesinto

both the aileron and wing panel.

Workthe aileron upand downseveral

times to “work in” the hinges and

check for proper movement.

Note:

HINGING THE ELEVATOR.

Glue the rudder hinges in place using the

same techniques used to hinge the ailerons.

4) Deflect the aileron and completely

saturate each hinge with thin C/A glue. The

aileronsfrontsurfaceshould 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.

Thehingeis constructed ofa special

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.

Note:

Hinge.

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HINGING THE RUDDER.

Glue the rudder hinges in place using the

same techniques used to hinge the ailerons.

Hinge.

WING TIP ASSEMBLY.

Removecovering.

Fillepoxy.

Covering.

Wing tip.

1) Attach the plastic wing tip to the wing. Use a

hobby knife to remove the covering at the wing

end.

2) Apply the epoxy to the surface of both wing

tip and wing end. The plastic wing tip is held in

position and install it to the wing end. Please

see pictures shown.

Install plastic wing tip to wing end.

YAK 52.Instruction Manual.

2 sets.

3x35mm.

ALUMINUMWASHER.

CONTROLHORN

M3 SCREW.

18mm.

Epoxy.

Wing

Epoxy.

M3LOCKNUT.

Aileroncontrolhorn.

Maskingtape.

INSTALL THE AILERONS CONTROL

HORN.

3) Once the epoxy cures and use a covering

iron to seal the covering on the wing and over

the wing tip.

1) Locate the hardware necessary to install

the control horns for the ailerons.

2) Position the control horn on the bottom of

the aileron. You will see pre-drill hole 3mm for

the horn mounting screw on the aileron.

3) Place epoxy into hole. This will harden the

threads and prevent the crews from pulling

loose.

4) Thread a control horn end with aluminum

washer, lock nut until the top edge of the end is

18mm from the vase of the horn as shown.

3mm.

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Install the flap control horn using the same

methodassameas theaileron control horns.

INSTALL FLAP CONTROL HORN.

Hinge.

Flap control horn.

T-pin.

C/Aglue.

T-pin.

C/Aglue.

Install the elevator control horn using the

same method as same as the aileron control

horns.

INSTALL ELEVATOR CONTROL HORN.

CONTROLHORNM3SCREW.

M3 lock nut.

ALUMINUMWASHER. 18mm.

ALUMINUMWASHER.

Epoxy.

Flap.

Aluminum Washer.

CONTROLHORN

M3 SCREW.

M3LOCK NUT.

Epoxy.

Aluminum Washer.

Flap.

2 sets.

3x30mm.

2 sets.

3x35mm.

YAK 52.Instruction Manual.

Rudder.

Aluminum Washer.

CONTROLHORN

M3 SCREW.

M3LOCK NUT.

Epoxy.

Aluminum Washer.

Fuselage.

18mm.

Epoxy.

Rudder.

INSTALL RUDDER CONTROL HORN.

1 sets.

3x50mm.

Aluminum Washer.

CONTROLHORN

M3 SCREW.

M3LOCK NUT.

Epoxy.

Aluminum Washer.

Elevator.

18mm.

Epoxy.

Elevator.

Elevator control horn.

Horizontal

Stabilizer.

Horizontal

Stabilizer.

3mm.

Repeatsteps to install the ruddercontrolhorn

as same as steps done for ailerons.

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ENGINE MOUNT INSTALLATION.

Ruddercontrolhorn.

M3 x 15mm.

1) Locate the items necessary to install the

engine mount included with your model. .

2) Usefour4x30mmheadbolts and four 4mm

washers to attach the engine mount rails to

thefirewall.Tighten the screws . Make sure to

use threadlock on the screws to help prevent

them from vibrating loose.

4x30mm.

Thread locker glue.

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.

INSTALLING THE STOPPER ASSEMBLY.

2) Usingamodelingknife, cut one length

ofsiliconfuelline. Connectoneendoftheline

totheweightedfuel pick up and the other end

to the nylon pick up tube.

YAK 52.Instruction Manual.

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

thetankis installed inside the fuselage, it may

be difficult to determine which is which.

Fueltank.

Venttube.

Fuel pick up tube.

Fuel fill tube.

3) Carefully bend the second nylon tube

up at a 45º angle. This tube is the vent tube.

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.

Venttube. Fuel pick up tube.

Fuel fill tube.

5) With the stopper assembly in place,

the weighted pick-up should rest away from

therear of the tank and move freelyinside 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.

6) When satisfied with the alignment of

the stopper assembly tighten the 3 x 20mm

machine screw until the rubber stopper ex-

pands and seals the tank opening. Do not

overtighten the assembly as this could cause

the tank to split.

FUEL TANK INSTALLATION.

Epoxy.

 7) Slide the fuel tank into the fuselage. Guide

the lines from the tank through the hole in the

firewall.

Fueltank.

 8) Use plywood template to hold in place

the fuel tank with C/A glue to secure the fuel

tank inside the fuselage.

Plywood template.

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