Seagull Models Extra 260 User manual

Kit features.

• Ready-made—minimalassembly&finishingrequired.

• Ready-coveredcovering.

• Photo-illustratedstep-by-stepAssemblyManual.

MadeinVietnam.

Specifications

Wingspan----------------------------------------70.9in----------------------------182cm.

Wing area---------------------------------------- 967sq.in-------------------- 62.4 sq.dm.

Approximate flying weight------------------ 12.8-13lbs------------------- 4.8-5.8kg.

Length--------------------------------------------64in-----------------------------163.5cm.

Recommended engine size--------------- 1.60 cu.in---------------------- 2-stroke.

1.80 cu.in---------------------- 4-stroke.

Radio System required 6 channels with 6 digital servos.

Flying skill level Intermediate/advanced.

MS:58

“Graphics and Specfications may change without notice”.

A S S E M B L Y M A N U A LA S S E M B L Y M A N U A L

A S S E M B L Y M A N U A L

EXTRA 260. Instruction Manual.

INTRODUCTION.

Thank you for choosing the EXTRA 260 ARTF by SEAGULL MODELS. The EXTRA 260 was

designed with the intermediate/advanced sport flyer in mind. It is a semi scale airplane which is

easytoflyandquicktoassemble.Theairframeisconventionallybuiltusingbalsa,plywood tomake

itstrongerthantheaverageARTF,yetthedesignallowstheaeroplanetobekeptlight.Youwillfind

that most of the work has been done for you already.Flying the EXTRA 260 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 EXTRA 260. 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

proceduresdesignedtohelpthenewpilotonhiswayto successful R/C flight. They will also be able

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

ADDITIONAL ITEMS REQUIRED.

1.60 2-stroke engine.

1.80 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 / aileron.

(2) Aluminium dihedral brace.

Tail section assembly

(2) 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 EXTRA 260 is made

from natural materials and minor ad-

justments 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.

The control surfaces, including the

ailerons,elevators, and rudder,are prehinged

with hinges installed, but the hinges are not

gluedinplace.Itisimperativethatyouproperly

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)Removeeach hinge from thewingpanel

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

each hinge. Slide each hinge into the aileron

untiltheT-pinis snug against the aileron.This

will help ensure an equal amount of hinge is

oneithersideofthehingelinewhentheaileron

is mounted to the wing panel.

HINGING THE AILERONS.

Note:

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

shouldbe maintained betweenthe wing panel

andaileron.

T-pin.

Hinge.

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.

Note:

The hinge is constructed of a special

materialthatallowstheC/Atowickorpenetrate

and distribute throughout the hinge, securely

bonding it to the wood structure of the wing

paneland aileron.

T-pin.

C/Aglue.

Hinge.

EXTRA 260. Instruction Manual.

HINGING THE ELEVATOR.

Glue the elevator hinges in place using the

same tectniques used to hinge the ailerons.

HINGING THE RUDDER.

Glue the rudder hinges in place using the

same tectniques used to hinge the ailerons.

INSTALLING THE AILERON SERVOS.

Note: Work the aileron up and down several

times to “work in” the hinges and check for

proper movement.

Repeat the procedure for the other

wing haft.

Because the size of servos differ, you

mayneedtoadjust the size of theprecutopen-

ing in the mount. The notch in the sides of

themountallowtheservoleadtopassthrough.

We recommended to use long servos arm

(70mmdiameter) for allservos without throttle

servo.

Install the rubber grommets and brass

collets onto the aileron servo. Test fit the

servo into the aileron servo mount.

Using a small weight (Weighted fuel pick-up

workswell) and thread, feedthestring through

the wing as indicated.

String.

Small weight.

applying medium pressure, trying to separate

the aileron from the wing panel. Use caution

not to crush the wing structure.

8)Afterbothailerons 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

7) Repeat this process with the other wing

panel, securely hinging the aileron in place.

5)Turn the wingpanelover 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.

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.

Thread.

Small weight.

Wing bottom.

(2)Servos. Small weight.

Thread.

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Attach the thread to the servo lead and

carefully thread it though the wing. Once you

havethreadthe leadthroughtthewing,remove

the string so it can use for the other servo

lead.Tapetheservoleadtothewingtoprevent

it from falling back into the wing.

Secure the servos with the screws pro-

vided with your radio system.

Repeat the procedure for the other wing

half.

ENGINE MOUNT.

See pictures below:(Engine mount do not

include)

Mark and drill 4 holes for engine mount.

4x30mm.

Thread locker glue.

Plastic tape.

Aileronelectric.

Electric wire.

Thread.

Wing bottom.

Electric wire.

Pull.

EXTRA 260. Instruction Manual.

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.

Attach the silicone fuel and pressure pipes

tothetank. The lowerpipeis the ‘feed’andthe

uppertwo the ‘pressureand fill’. Thefill pipeis

the next pipe.

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.

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.

INSTALLING THE STOPPERASSEMBLY.

FUEL TANK.

Carefully use a lighter or heat gun to

permenently set the angle of the vent tube.

Important: When the stopper assembly is

installed 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.

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.

Silicon tubing not inclued.

Vent tube. Fuel pick up

tube.

Fuel fill tube.

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You should mark which tube is the vent

and which is the fuel pick up when you attach

fuel tubing to the tubes in the stopper. Once

thetank is installed inside thefuselage, itmay

be difficult to determine which is which.

Fueltank.

Rubber band.

Vent tube.

Fuelfill tube.

Fuel pick up tube.

2) Follow diagram below for wheel pant

installation:

1) Assembleand mountingthewheelpants

as shown in the following pictures.

WheelCollar.

Axle.

Wheel. Nut.

Wheel Pant.

LandingGear.

Nut.

Plywood Washer.

14mm.

7mm.

3) You have to trim each axles and using a

tool cutting and cut-off wheel.

Caution when cutting the axles wear

protective goggles.

57mm.

Blow through one of the lines to ensure

the fuel lines have not become kinked inside

the fuel tank compartment. Air should flow

through easily.

WHEEL AND WHEEL PANTS.

EXTRA 260. Instruction Manual.

6mm X 20mm.

1) The blind nuts for securing the landing

gearare already mountedinside the fuselage.

2) Usingthe hardware provided, mount the

main landing gear to the fuselage.

INSTALLING THE MAIN LANDING

GEAR.

Landing

gear.



4) A drop of Thread locker glue on the

wheel collar screws will help keep them from

coming lose during operation.

Repeat the process for the other wheel.

INSTALLING THE FUSELAGE SERVO.

Engine - 2 stroke:

Plywood Washer.

lite-plywoodblock.

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Engine - 4 stroke:

Rudder servo.

Throttle servo.

C/Aglue.

Servo tray.

1) Locate and cut out the covering film

fromthe servo holesin bothsides of fuselage.

ELEVATOR SERVO INSTALLATION.

2) Installthe rubber grommets and brass

collets onto the elevator servo. Test fit the

servo into the elevator servo mount.

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.

3)Secure theservos with the screws pro-

vided with your radio system.

Left side.

Remove covering.

Rudder servo.

Throttle servo.

Rightside.

Elevator servo.

C/Aglue.

Left side.

Elevator servo.

EXTRA 260. Instruction Manual.

 6) Attachthe Z-Bendin the pushrodwireto

thethrottlearmonthe carburetor.Youwillneed

toremovethethrottlearmfromthecar-buretor

to be able to attach the Z-bend. When

complete,re-attach the throttlearm to the car-

buretor.

 5) Boltthe enginetotheenginemountusing

the four machine screws. Double check that

all the screws are tight before proceeding.

Engine - 2 stroke:

Engine - 4 stroke:

4x30mm.

COWLING.

Pushrod

wire.

Thread locker.

Pushrod

wire.

 2) Place your engine onto the engine

mount. Adjust the engine is centered of the

edges of the engine case.

MOUNTING THE ENGINE.

1) Install the pushrod housing through the

predrilledholein the firewallandintothe servo

compartment. The pushrod housing should

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

MakeaZ-Bend 1/4" fromoneend of theplain

wire pushrod.

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

drill the mounting holes through the engine

mount at the four locations marked.

 3) When you are satisfied with the align-

ment, mark the locations of the engine

mounting.

4.2mm.

4x30mm.

150mm.

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