Seagull Models Extra 300S User manual
MadeinVietnam.
ASSEMBLY MANUAL MS: 70
“Graphics and specfications may change without notice”.
Kit features.
• Ready-made—minimalassembly&finishingrequired.
• Ready-coveredcovering.
• Photo-illustratedstep-by-stepAssemblyManual.
Specifications
Wingspan----------------------------------------63in----------------------------160cm.
Wing area------------------------------------- 662.8 sq.in---------------- 42.8 sq.dm.
Approximate flying weight---------------- 6.6-7.5 lbs------------------- 3.0-3.2kg.
Length--------------------------------------------45.9in------------------------116.7cm.
Recommended engine size----------- .61-75 cu.in--------------------- 2-stroke.
.72 - 1.15 cu.in------------- 4-stroke.
Radio System required 4 channels with 6 servos.
Flying skill level Intermediate/advanced.
2
EXTRA 300S Instruction Manual
2
INTRODUCTION.
ThankyouforchoosingtheEXTRA300S ARTFbySEAGULLMODELS.The EXTRA300S was
designedwith theintermediate/advanced sport flyer in mind.It isa scale airplane which iseasy to
fly and quick to assemble. The airframe is conventionally built using balsa, plywood to make it
stronger than the average ARTF , yet the design allows the aeroplane to be kept light. You will find
thatmostoftheworkhasbeendoneforyoualready. Themotormounthasbeenfittedandthehinges
are pre-installed . Flying the EXTRA 300S 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 300S. 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
proceduresdesignedtohelpthenewpilot on hisway tosuccessful R/Cflight. Theywillalsobeable
to advise on any insurance and safety regulations that may apply.
ADDITIONAL ITEMS REQUIRED.
.61-.75 2-stroke engine
.72-1.15 4-stroke engine
Computer radio with six 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
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-
semblyasthe EXTRA 300Sismade
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.Do notletthese chemi-
calscome in contact with thecolours
onthecovering andtheplastic parts.
1) Carefully remove the aileron from one
of the wing panels. Note the position of the
hinges.
2)Remove eachhinge fromthe wingpanel
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
ofhingeis oneithersideof thehingelinewhen
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 maintainedbetween the wingpanel
andaileron.
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 youproperly adherethe
hingesin placeper thesteps thatfollow
using a high-quality thin C/A glue.
Note:
Hinge.
T-pin.
4)Deflect the aileron and completely
saturate each hinge with thin C/A glue. The
aileronsfrontsurface shouldlightlycontactthe
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
material that allows the C/A to wick or
penetrateanddistribute throughoutthe
hinge, securely bonding it to the wood
structureof thewing panel andaileron.
C/Aglue.
T-pin.
EXTRA 300S Instruction Manual
4
3x20mm.
HINGING THE ELEVATOR.
8)After both ailerons 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.
5) Turn the wing panel over and deflect the
aileron in the opposite direction from the
opposite side. Apply thin C/A glue to each
hinge,makingsurethattheC/Apenetratesinto
both the aileron and wing panel.
6) Using C/A remover/debonder and a
papertowel, removeanyexcess C/Aglue 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.
Theholelocation of turnbucklesshownin pic-
ture below .
Installingthe turnbucklefor tailstrut of hori-
zontal fin as same as pictures below.
See pictures below:
ENGINE MOUNT INSTALLATION.
Mark and drill 4 holes for engine mount.
Insert 4 blind nuts to firewall.
C/Aglue.
Pre-drilledatfactory.
Horizontal fin bottom.
Turnbuckle.
4x25mm.
Thread locker glue.
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2) Usinga modelingknife, cutone length
ofsilicon fuel line. Connectone endof the line
tothe weightedfuel pickup and theother 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.
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.
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.
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.
Venttube. Fuel pick up tube.
Fuel fill tube.
Silicon tubing not inclued. 5) With the stopper assembly in place,
the weighted pick-up should rest away from
therear of thetank and movefreely 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.
EXTRA 300S Instruction Manual
6
1) Assembleand mounting the wheel pants
as shown in the following pictures.
2) Follow diagram below for wheel pant
installation:
Blow through one of the lines to ensure
thefuel lines havenot become kinked in-
side the fuel tank compartment. Air should
flowthrough easily.
WHEELAND WHEEL PANTS INSTALLA-
TION.
3) You have to trim each axle using a tool
cutting and cut-off wheel.
Caution when cutting the axles and
wear protective goggles.
Fuel pick-up
tube. Fuelfill tube.
Venttube.
FUEL TANK INSTALLATION.
Plastic tape.
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.
Rubber band.
Fueltank. Wheel Collar.
Axle.
Wheel. Nut.
Wheel Pant.
LandingGear.
Nut.
(2)Washer.
46mm
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(2)Wheel Collar.
Axle.
Wheel. Nut.
Nut.
(2)Washer.
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 thefirewalland intotheservo
compartment. The pushrod housing should
protrude 1/4" out past the front of the firewall.
Makea Z-Bend1/4"from oneend of theplain
wire pushrod.
MOUNTING THE ENGINE.
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.
1) The blind nuts for securing the landing
gearare alreadymountedinside thefuselage.
2) Using the hardware provided, mount
the main landing gear to the fuselage.
INSTALLING THE MAIN LANDING GEAR.
4x20mm.
Landinggear.
130mm
.
EXTRA 300S Instruction Manual
8
Trimand cut.
6) AttachtheZ-Bend inthepushrod wireto
the throttle arm on the carburetor.
COWLING INSTALLATION.
1) Slide the fiberglass cowl over the en-
gineandline uptheback edgeofthe cowlwith
themarks youmade onthe fuselagethen trim
and cut.
Trimand cut.
2) While keeping the back edge of the
cowl flush with the marks, align the front of
thecowlwiththe crankshaft oftheengine. The
front of the cowl should be positioned so the
crankshaft is in nearly the middle of the cowl
opening.Usethespinnerbackplateasaguide.
Hold the cowl firmly in place using pieces of
masking tape.
Becauseof thesizeof thecowl, itmay be nec-
essaryto usea needlevalve extensionfor the
highspeed needle valve. Makethis outofsuf-
ficient length 1.5mm wire and install it into the
end of the needle valve. Secure the wire in
placeby tighteningthe setscrew inthe sideof
the needle valve.
5) Bolttheenginetotheenginemountusing
the four machine screws. Double check that
all the screws are tight before proceeding.
4.2mm.
Pushrodwire.
MachineScrew 4x30mm. Machine Screw 3x10mm.
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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).
Install the spinner backplate, propeller and
spinner cone.
INSTALLING THE SPINNER.
INSTALLING THE FUSELAGE SERVO.
1) Installthe rubbergrommets andbrass
colletsonto thethrottleservo. Testfit the servo
into the aileron servo mount.
2) Secure the servos with the screws pro-
vided with your radio system.
Because the size of servos differ, you
mayneedtoadjust thesizeoftheprecut 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.
Throttle servo.
Rudder
servo. Elevator servo.
Elevator servo.
EXTRA 300S Instruction Manual
10
THROTTLE SERVO ARM INSTALLATION.
1) Install adjustable servo connector in
the servo arm as same as picture below:
2)Usingamodelingknife,carefullyremove
thecovering at mountingslot ofhorizontalsta-
bilizer ( both side of fuselage).
3) Slide the stabilizer into place in the pre-
cut slot in the rear of the fuselage. The stabi-
lizer should be pushed firmly against the front
of the slot.
HORIZONTALSTABILIZER.
1) Using a ruler and a pen, locate the
centerlineof the horizontalstabilizer,atthetrail-
ing edge, and place a mark. Use a triangle
and extend this mark, from back to front,
across the top of the stabilizer. Also extend
thismark downthe backof thetrailing edgeof
the stabilizer.
4) With the stabilizer held firmly in place,
use a pen and draw lines onto the stabilizer
where it and the fuselage sides meet. Do this
on both the right and left sides and top and
bottom of the stabilizer.
Pen.
5) Remove the stabilizer. Using thelines
youjust drewas aguide, carefullyremove the
covering from between them using a model-
ingknife.
Centerline.
Throttle servor arm .
Rudder
servo. Elevator servo.
Elevator servo.
Removecovering.
INSTALLING THE SWITCH.
Installthe switchintothe precuthole inthe
side of fuselage.
Switch.
AdjustableServo
connector.
Servoarm.
Nut.
Threadlocker glue.
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