Seagull Models YAK 55 Manual de usuario

“Graphics and specifications may change without notice”.

ASSEMBLY MANUAL

MS: 131

Specifications:

Wingspan---------------------------68.9in(175cm).

Wingarea---------------1026.1sq.in(66.2sqdm).

Weight--------------------11.5-14.3lbs(5.2-6.5kg).

Length------------------------------64.8in(164.7cm).

Engine -----------------1.2-1.6cu.in-----2-stroke.

30-35 --- gasoline engine.

Radio-----------6channelswith6digitalservos.

YAK 55. Instruction Manual

INTRODUCTION.

Thankyouforchoosingthe YAK 55 ARTFbySEAGULLMODELS.The YAK 55 wasdesigned

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

andquick toassemble.Theairframeisconventionallybuiltusingbalsa,plywood tomakeitstronger

thantheaverageARTF, yet the design allows the aeroplane to bekeptlight.Youwill find that most

oftheworkhasbeendoneforyoualready. Themotormounthasbeenfittedandthehingesarepre-

installed . 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

supplierandjoinyourlocalR/CModelFlyingClub.R/CModelFlyingClubsofferavarietyoftraining

proceduresdesigned tohelpthenew pilotonhiswaytosuccessfulR/C flight.Theywillalso beable

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

KIT CONTENTS

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ADDITIONAL ITEMS REQUIRED.

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

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

KIT CONTENTS

1 Fuselage

2 Left wing panel

3 Right wing panel

4 Canopy

5 Tail set

6 Aluminum wing tube

7 Scale pilot

8 Main landing gear

9 Fiberglass cowl

1) Sand each end of hinge point hinge

using coarsesandpaper.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.

3)Allow the glue to fully cure for at least 6

hours.When cured, work each hinge

throughout its full motion several times.This

willbreakfree any epoxy that may havefound

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.

2) Mix minute epoxy. Using a glue syringe

or toothpick, place 30-minute epoxy into one

ofthe hingepocketsintheaileronleadingedge

oftheaileron. Some epoxy should ooze outof

the pocket as the hinge is installed. If not,

removethehinge and apply moreepoxy.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.

HINGING THE AILERONS.

Properlyhingingthecontrol surfaces on

this models is very important.Poorly

installed hinges affect the model’s

precisionandcontrolresponseandcan

also be dangerous.

Note:

C/Aglue.

Epoxy.

YAK 55. Instruction Manual

HINGING THE ELEVATOR.

HINGING THE RUDDER.

Glue the elevator hinges in place using the

same techniques used to hinge the ailerons.

Glue the rudder hinges in place using the

same techniques used to hinge the ailerons.

Work the aileron up and down several

times to “work in” the hinges and check

for proper movement.

Note:

 4) Mix 30 minute epoxy or use Pace PT-

55hinge glue.Placea sufficientamountof glue

ineachof the hinge pocketsinonewingpanel.

5)Pressthe aileronandwingtogether 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

rubbingalcoholto wipeawayanyvisible epoxy

around the hinges.

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.

Epoxy.

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INSTALL AILERON CONTROL HORN.

Aileroncontrol horn.

INSTALL ELEVATOR CONTROL HORN.

Epoxy.

Elevator control horn.

Epoxy.

INSTALL RUDDER CONTROL HORN.

Epoxy.

Fiberglass control horn.

YAK 55. Instruction Manual

Ruddercontrolhorn.

1) Locate the items necessary to install the

engine mount included with your model. .

ENGINE MOUNT INSTALLATION.

4x30mm.

2) Usefour4x30mmhead bolts and four 4mm

washers to attach the engine mount rails to

thefirewall.Tightenthescrews . Make sureto

use threadlock on the screws to help prevent

them from vibrating loose.

Thread locker glue.

3) Carefully bend the second nylon tube

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

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) Usingamodeling knife, cut one length

ofsiliconfuelline. Connectoneendoftheline

totheweighted fuel pick up and the other end

to the nylon pick up tube.(The silicon tube is

not included).

Epoxy.

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5) With the stopper assembly in place,

the weighted pick-up should rest away from

therear 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.

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.

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.

Important: When the stopper assembly is in-

stalled 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.

Carefully use a lighter or heat gun to

permenently set the angle of the vent tube.

Venttube. Fuel pick up tube.

Fuel fill tube.

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.

Fueltank.

C/Aglue.

Balsa wood included.

 8) Use balsa stick to help prevent moveable

from transferring to the fuel tank.

 7) Slide the fuel tank into the fuselage.

Guide the lines from the tank through the hole

in the firewall.

C/Aglue.

Fueltank.

YAK 55. Instruction Manual

Fuel pick-up tube. Fuelfill tube.

Venttube.

Blow through one of the lines to ensure

thefuel lines have not become kinked in-

side the fuel tank compartment. Air should

flowthrough easily.

 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.

Pushrodwire.

1) Locate the items neccessary to install

the wheel and wheel pants as shown.

WHEEL AND WHEEL PANTS

INSTALLATION.

Repeat steps as above to attach remain-

ing wheel pants to the landing gear.

2) You have to trim each axle using a tool

cutting and cut-off wheel.

Caution when cutting the axles and

wear protective goggles.

Aluminumlandinggear.

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INSTALLING THE MAIN ALUMINUM

LANDING GEAR TO FUSELAGE.

Lockerglue.

M4x 20mm.

 3) The blind nuts for securing the landing

geararealreadymountedinsidethefuselage.

 4) Using the hardware provided, mount

the main landing gear to the fuselage.

 5) Placethefuselageinvertedon the work-

benchinasuitablestand.Setthe landing gear

in place and use a screwdrive to secure the

landing gear to the fuselage using bolts

M4x20mmandwashers.Make sure to use the

threadlock on the bolts so they don’t vibrate

loose.

FUSELAGE SERVO INSTALLATION.

We recommended to use long servos arm

(70mm diameter)for all servos without throttle

servo.

Because the size of servos differ, you

mayneed toadjustthe sizeoftheprecutopen-

ing in the mount. The notch in the sides of

themountallowtheservoleadtopassthrough.

Install the rubber grommets and brass

collets onto the servo. Test fit the servo into

the servo mount.

1) Usingasmallweight (Weighted fuelpick-up

workswell) and string, feed the string through

the wing as indicated.

String.

Small weight.

2) Place the servo between the mounting

blocksand spaceitfromthehatch.Useapencil

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.

5) Use dental floss to secure the connection

so they cannot become unplugged.

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\Aglue.

YAK 55. Instruction Manual

8) A string has been provided in the wing to

pull the aileron lead through to the wing root.

Remove the string from the wing at the servo

location and use the tape to attach it to the

servoextensionlead.Pulltheleadthroughthe

wing and remove the string.

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.

1)Elevatorservos:Installtheservosin the

both side of fuselage.

Drill a 1mm pilot hole before installing the

screw. Using the screws included with the

servos, fasten the servos in place.

Left side.

Elevator servo.

Right side.

Elevator servo.

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