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 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.
2
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.
4
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.
Thread.
Wing bottom.
Electric wire.
Pull.
EXTRA 260. Instruction Manual.
6
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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7
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.
8
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.
10
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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