Seagull Models YAK 54 User manual

MS: 65

ASSEMBLY MANUAL

Kit features.

• Ready-made—minimalassembly&finishingrequired.

• Ready-coveredcovering.

• Photo-illustratedstep-by-stepAssemblyManual.

MadeinVietnam.

Specifications

Wingspan---------------------------------------- 57in----------------------------145cm.

Wing area---------------------------------------- 697 sq.in------------------- 45 sq.dm.

Approximate flying weight------------------ 6.4-7.5lbs------------------- 2.9-3.4kg.

Length--------------------------------------------52.8in---------------------------134cm.

Recommended engine size---------------- .61 cu.in---------------------- 2-stroke.

.72-.82 cu.in------------------ 4-stroke.

Radio System required 4 channels with 6 digital servos.

Flying skill level Intermediate/advanced.

YAK 54. Instruction Manual

INTRODUCTION.

Thank you for choosing the YAK 54 ARTF by SEAGULL MODELS. The YAK 54 was designed

withtheintermediate/advancedsportflyerinmind.Itisa scale airplane whichiseasytoflyandquick

to assemble. The airframe is conventionally built using balsa, plywood to make it stronger than the

averageARTF,yetthedesignallowstheaeroplanetobekeptlight.Youwillfindthatmostofthework

has been done for you already. The motor mount has been fitted and the hinges are pre-installed

. Flying the YAK 54 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 54. 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

proceduresdesignedtohelpthenewpiloton his way to successful R/C flight. They will also beable

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

ADDITIONAL ITEMS REQUIRED.

.61 2-stroke engine

.72-.82 4-stroke engine

Computer radio with six digital

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.

PARTS LISTING.

FUSELAGE ASSEMBLY

(1) Fuselage.

(1) Canopy hatch.

WING ASSEMBLY

(1) Right wing half/ aileron.

(1) Left wing half with/ aileron.

(1) Aluminium dihedral brace.

Tail section assembly

(1) Horizontal stabilizer/ elevator

halves.

(1) Rudder halves.

Some more parts.

HARDWAREPACK

COWLING

Landinggear.....

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NOTE: To avoid scratching your new aero-

planewesuggestthatyoucoveryour

workbench with an old towel. Keep a

couple of jars or bowls handy to hold

the small parts after you open the

bags.

Pleasetrialfitallparts.Makesureyou

have the correct parts and that they

fit and are aligned properly before

gluing! This will ensure proper as-

sembly as the YAK 54 is made from

natural materials and minor adjust-

ments may have to be made.

The paint and plastic parts used in

this kit are fuel proof. However, they

arenottolerantofmanyharshchemi-

cals including the following: paint

thinner, cyano-acrylate glue accel-

erator,cyanoacrylategluede-bonder

andacetone.Donot let thesechemi-

calscome incontact withthe colours

onthecoveringand the plasticparts.

Please contact Horizon Hobby for product support and technical assistance at 877-

504-0233. ReplacementpartsareavailablefromyourlocaldealerorthroughHorizon

Hobby.

HORIZON HOBBY DISTRIBUTIONS INC

4105FieldstoneRd, Champaign, IL 61822- USA

FOR USA MARKET ONLY.

Horizon Hobby, Inc. guarantees this kit to be free from defects in both material and workmanship

at the date of purchase. This warranty does not cover any parts damage by use or modification.

In no case shall Horizon Hobby’s liability exceed the original cost of the purchased kit. Further,

Horizon Hobby reserves the right to change or modify this warranty without notice. In that

Horizon Hobby has no control over the final assembly or material used for the final assembly,

no liability shall be assumed nor accepted for any damage resulting from the use by the user

of the final user-assembled product. By the act of using the user-assembled product, the user

accepts all resulting liability.

Once assembly of the model has been started, you must contact Horizon Hobby, Inc. directly

regarding any warranty question that you have. Please do not contact your local hobby shop

regarding warranty issues, even if that is where you purchased it. This will enable Horizon to

better answer your questions and service you in the event that you may need any assistance.

If the buyer is not prepared to accept the liability associated with the use of this product, the

buyer is advised to return this kit immediately in new and unused condition to the place of

purchase.

Horizon Hobby

4105 Fieldstone Road

Champaign, Illinois 61822

(217)355-9511

YAK 54. Instruction Manual

1)Carefullyremove the aileronfrom one of

thewingpanels.Notethepositionofthehinges.

2)Removeeachhinge from thewingpanel

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. This will help ensure an equal amount

ofhingeison either side ofthehingelinewhen

the aileron is mounted to the aileron.

HINGING THE AILERONS.

3) Slide the wing panel on the aileron 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

shouldbe maintained betweenthe wing panel

andaileron.

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

5)Turnthe wingpanel over anddeflect the

aileron in the opposite direction from the

opposite side. Apply thin C/A glue to each

hinge,makingsure that the C/Apenetratesinto

both the aileron and wing panel.

The hinge is constructed of a special

material that allows the C/A to wick or

penetrateanddistributethroughout the

hinge, securely bonding it to the wood

structureof the wingpanel and aileron.

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:

The control surfaces, including the

ailerons, elevators, and rudder, are

prehinged with hinges installed, but the

hinges are not glued in place. It is

imperativethat you properly adhere the

hingesin place per the steps that follow

using a high-quality thin C/A glue.

Note:

C/Aglue.

Hinge.

T-pin.

C/Aglue.

T-pin.

www.seagullmodels.com

3x20mm.

HINGING THE ELEVATOR.

8)Afterbothailerons are securely hinged,

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, remove anyexcessC/A glue that

may have accumulated on the wing or in the

aileronhinge area.

HINGING THE RUDDER.

Glue the elevator hinges in place using the

same tectniques used to hinge the ailerons.

Glue the rudder hinges in place using the

same tectniques used to hinge the ailerons.

Work the aileron up and down several

times to “work in” the hinges and check

for proper movement.

Note:

TURNBUCKLE INSTALLATION.

Theholelocationofturnbuckles shown in pic-

ture below .

The mounting holes of turnbuckle was

pre-drilled at factory.

Installing theturnbuckle for tail strut ofhori-

zontal fin as same as pictures below.

See pictures below:

Mark and drill 4 holes for engine mount.

3x25mm.

ENGINE MOUNT INSTALLATION.

Horizontal fin bottom.

Turnbuckle.

Hinge.

pre-drilled at factory

YAK 54. Instruction Manual

2) Usinga modeling knife,cut onelength

ofsiliconfuel line. Connect oneend of theline

tothe weighted fuel pick up andthe other end

to the nylon pick up tube.

3) Carefully bend the second nylon tube

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

Carefully use a lighter or heat gun to

permenently set the angle of 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.

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.

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.

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 STOPPERASSEMBLY.

FUEL TANK INSTALLATION.

Attach the silicone fuel and pressure pipes

tothetank. The lowerpipeis the ‘feed’andthe

uppertwo the ‘pressureand fill’. Thefill pipe is

the next pipe.

Venttube. Fuel pick up tube.

Fuel fill tube.

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1) Assembleand mountingthewheelpants

as shown in the following pictures.

2) Follow diagram below for wheel

installation:

Blow through one of the lines to ensure

thefuel lines have not become kinked in-

side the fuel tank compartment. Air should

flowthrough easily.

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.

WheelCollar.

Axle.

Wheel.

LandingGear.

Nut.

(2)Washer.

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

cutting and cut-off wheel.

46mm

Caution when cutting the axles and

wear protective goggles.

Plastic tape.

WHEEL INSTALLATION.

Rubber band.

Fueltank.

2:Fuel pick-up

tube. 3:Fuelfill tube.

1:Vent tube.

YAK 54. Instruction Manual

(2)Wheel Collar.

Axle.

Wheel. Nut.

Nut.

(2)Washer.

1) The blind nuts for securing the landing

gearare already mountedinsidethe fuselage.

2) Using the hardware provided, mount

the main landing gear to the fuselage.

4) A drop of C/A glue on the wheel collar

screws will help keep them from coming lose

duringoperation.

Repeat the process for the other wheel.

4) Remove the engine. Using an drill bit,

drill the mounting holes through the engine

mount at the four locations marked.

 2) Place your engine onto the engine

mount. Adjust the engine is centered of the

edges of the engine case.

 3) When you are satisfied with the align-

ment, mark the locations of the engine

mounting.

1) Install the pushrod housing through the

predrilledholein the firewall andintothe servo

compartment. The pushrod housing should

protrude 1/4" out past the front of the firewall.

Makea Z-Bend 1/4"fromone end oftheplain

wire pushrod.

MOUNTING THE ENGINE.

INSTALLING THE MAIN LANDING GEAR.

130mm.

4x20mm.

Landinggear.

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 5) Bolttheenginetotheenginemountusing

the four machine screws. Double check that

all the screws are tight before proceeding.

 6) AttachtheZ-Bendin the pushrodwire to

thethrottlearmonthe carburetor.Youwill need

toremovethethrottlearmfromthecar-buretor

to be able to attach the Z-bend. When

complete,re-attach the throttlearm to thecar-

buretor.

COWLING INSTALLATION.

1) Slide the fiberglass cowl over the en-

gineandline up thebackedgeof the cowlwith

themarks you made on thefuselage thentrim

and cut.

2) While keeping the back edge of the

cowl flush with the marks, align the front of

thecowlwiththecrankshaftoftheengine. The

front of the cowl should be positioned so the

crankshaft is in nearly the middle of the cowl

opening.Usethespinner backplate as a guide.

Hold the cowl firmly in place using pieces of

masking tape.

3) Installthemufflerandmufflerextension

onto the engine and make the cut out in the

cowl for muffler clearance. Connect the fuel

and pressure lines to the carburetor, muffler

and fuel filler valve. Secure the cowl to fuse-

lage using the 3x10mm screws (4).

Becauseof the sizeofthe cowl,itmay be nec-

essaryto use a needle valveextension forthe

highspeedneedle valve. Make thisoutof suf-

ficient length 1.5mm wire and install it into the

end of the needle valve. Secure the wire in

placeby tightening theset screwin the sideof

the needle valve.

Pushrodwire. 4x30mm.

4.2mm.

Trimand cut.

YAK 54. Instruction Manual

Install the spinner backplate, propeller and

spinner cone.

INSTALLING THE SPINNER.

INSTALLING THE FUSELAGE SERVO.

INSTALLING THE SWITCH.

Installthe switch intotheprecut hole inthe

side, in the fuselage.

1) Installthe rubber grommets and brass

colletsonto the throttleservo. Testfittheservo

into the aileron servo mount.

 2) Secure the servos with the screws pro-

vided with your radio system.The position

show in picture below:

Because the size of servos differ, you

mayneedtoadjustthesizeofthe precut open-

ing in the mount. The notch in the sides of the

mount allow the servo lead to pass through.

The propeller should not touch any part

of the spinner cone. If it does, use a

sharp modeling knife and carefully trim away

the spinner cone where the propeller comes

in contact with it.

Removecovering.

3x10mm.

Elevator servo.

Rudder

servo.

Elevator servo. Throttle servo.

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