Seagull Models Extra 300S User manual

Kitfeatures

• Ready-made—minimal assembly & finishing required.

• Ready-covered—including decals, trim & covering.

• Factory-installedpushrods.

• Factory-installedmetalenginemount.

• Factory-pinned&gluedcontrolsurfacehingesforultimatesafety.

• Comprehensivehardwarepackincludingwheels,tank,spats,undercarriage& spinner.

• Photo-illustratedstep-by-stepAssemblyManual.

WARNING

•Thisaicrafthasbeendesignedforintermediatelevelflyers.First timepilot shouldbea

experienced flyer(proficientpilot).

•This aicraft is desgined to be powered a 2 stroke .46 engine or a 4 stroke .53 engine.

Installationofenginesother itcouldtolead aseiousaccidentordamage tproperty.

Hand-made Almost Ready to Fly R/C Model Aircraft

ASSEMBLY MANUAL

Made in Vietnam

EXTRA 300S Instruction Manual

INTRODUCTION

Thank you for choosing the EXTRA 300S ARTF by SEAGULL MODELS. The EXTRA 300S was

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

easy to fly and quick to assemble. The airframe is conventionally built using balsa, plywood and

veneer to make it stronger than the average ARTF , yet the design allows the aeroplane to be kept

light.You willfind thatmost oftheworkhasbeendonefor youalready. Thepushrods arepre-made

to the correct lengths, the motor mount has been fitted and the hinges are pre-installed and pinned

for security. 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.

IfyouareinexperiencedwithbasicR/CflightwestronglyrecommendyoucontactyourR/Csupplier

and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training

proceduresdesigned tohelpthe newpilotonhis waytosuccessfulR/C flight.Theywill alsobeable

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

ADDITIONAL ITEMS REQUIRED

!.46-.61 2-stroke engine.

!Computer radio with five 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.

WING ASSEMBLY

!(1) Right wing half with pre-installed

aileron.

!(1) Left wing half with pre-installed

aileron.

!(1) Plywood wing dihedral brace.

!(1) Covering strip for centre section

joint.

Tail section assembly

!(1) Vertical stabilizer with pre-

installedrudder.

!(1) Horizontal stabilizer with pre-

installedelevator halves.

Some more parts.

HARDWAREPACK

COWLING.

Landing gear.....

EXTRA 300S INSTRUCTION MANUAL

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 EXTRA300S ismade

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 not let these chemi-

calscome in contact with the colours

onthecovering and the plastic parts.

EXTRA 300S Instruction Manual

WING ASSEMBLY

NOTE: We highly recommend using 30

minute epoxy as it is stronger and

providesmoreworkingtime,allowing

thebuildertoproperlyaligntheparts.

Using fast cure epoxy when joining

the wing halves could result in the

glue drying before the wing halves

arealignedproperlywhichmayresult

in failure of the wing centre section

during flight.

! 1. Locate the plywood wing dihedral

brace.Using a ruler, locate its centre

and draw a vertical line .

! 2. Test fit the dihedral brace into each

wing half. The brace should slide in

easily up to the centreline that you

drew. If not, use 220 grit sandpaper

with a sanding block and sand down

theedges andendsofthe braceuntil

it fits properly.

the top and bottom as well as the sides of the

dihedral brace. Use enough epoxy to fill any

gaps.

! 4. Insertthedihedralbraceintothedihe-

dral box up to the centreline. With

paper towels and rubbing alcohol,

wipe off any excess epoxy that may

have squeezed out of the joint. Next

pour some epoxy into the dihedral

box in the other wing panel. Apply

epoxytotheexposedportionthebrace

and to the wing root of both wings.

Carefully slide the two wing halves together

and firmly press them together, allowing the

excess epoxy to run out. There should not be

any gap in the wing halves. Use rubbing

alcohol and a paper tower to clean up any

excess epoxy.

! 3. Remove the brace when satisfied

withitsfitineachwinghalf.Coatboth

sidesofonehalfofthedihedralbrace

with 30 minute epoxy. Next, pour

some epoxy into the dihedral box in

onewingpanel.Makesureyoucover

Applymaskingtapeatthewingjointoholdthe

winghalvestogethersecurely. Allowthe epoxy

to cure before installing the aileron servos.

Centre line.

Epoxy

EXTRA 300S INSTRUCTION MANUAL

Use a small weight (Weighted fuel pick-up)

and thread to feed the servo connector

through the wing as shown.

INSTALLING THE AILERON SERVOS.

!1) Remove servo tray from the each panel

of wing. Install servo and servo arm. See

pictures bellow.

Attachthe string to one end ofservo lead and

carefully thread it though the wing. Once you

havethreadthelead throughtthewing,remove

the string and repeat for the other servo lead.

Use masking tape to secure the leads to the

wing and prevent them from falling back into

the wing

Because the size of servos differ, you

may need to adjust the size of the

precut opening in the mount. The notch

in the sides of the mount allow the servo

lead to pass through.

!2) Install the rubber grommets and brass

colletsonto the aileronservo. Test fit the servo

into the aileron servo mount.

Small weight

Thread

Small weight.

Thread.

Servo (2pcs).

EXTRA 300S Instruction Manual

!3) Install the aileron servo tray into the

servo mount.

Repeat the procedure for the other wing

half.

AILERON LINKAGE

INSTALLING THEAILERONLINKAGE

!1) Using a ruler & pen to draw a straight

line as below picture.

! 2) Locate nylon control horns, nylon con-

trol horn backplates and 2 machine screws.

Servoarm

Servo

electric

wire

Thread

Servo arm

2MM x 20MM

EXTRA 300S INSTRUCTION MANUAL

! 3) Position the aileron horn on the bottom

side of aileron. The clevis attachment holes

should be positioned over the hinge line as

shown below.

!4) Using a 1mm drill bit and the control

horns as a guide, drill the mounting holes

through the aileron halves.

! 6)Threadone clevis control hornontoeach

aileron torque rod. Thread the clevis on until

theyareflushwiththeends of the torque rods.

! 5) Mount the control horns by inserting the

screws through the control horn bases and

aileron halves, then into the mounting

backplates.

Do not overtighten the screws or the

backplates may crush the wood.

cut

clevis

AileronTorquerod

Control horn

ControlHorn

MountingScrews MountingPlate

EXTRA 300S Instruction Manual

Attachthe siliconefuel,feedand pressurepipe

tothetank.Thelowerpipeisthe‘feed’andthe

upper is the ‘pressure’ . The silicone fuel pipe

is the next of feed pipe.

Slide the tank into the fuselage from inside so

that the neck is at the top of the fuselage and

itlocatesthroughtheengine bulkhead. Gently

secure it to the top horizontal former with the

cable tie .

INSTALLING THE STOPPERASSEMBLY

!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) Usingamodeling knife, cut one length

ofsiliconfuelline. Connectoneendofthe line

to the weighted fuel pickup and the other end

to the nylon pickup tube.

!3) Carefully bend the second nylon tube

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

To set the angle of the vent tube use a lighter

or heat gun to heat the tube (do not melt the

tube).

PARTSREQUIRED

FUEL TANK

!{1} Molded NylonFuelTank

!{1} Preassembled StopperAssembly

!{1} Metal WeightedPick-Up

!{1} Silicon tube

!5) With the stopper assembly in place,

the weighted pickup 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

thestopper assemblytightenthe 3mmx20mm

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.

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.

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 each of them.

Vent tube

Fuel Pickup Tube

Fuel fill Tube

EXTRA 300S INSTRUCTION MANUAL

MOUNTINGTHEENGINE

!1)Trial fit yourengineonthemotormount.

The engine should be positioned so there is

ample clearance in the cowling for spinner

backplate mounted to the prop drive shaft.

!2) Marking 4 points on the plastic motor

mount.

!3) Screw 4 pilot holes with 5 mm diam-

eter.

!4) Your engine on the motor mount by

mounting with 4 bolts, 8 washers, and 4 nuts

provided.

A drop C/A glue on the bolt threads will help

prevent loosening in flight.

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.

!5)AttachtheZ-Bendin the pushrod wire to

thethrottle armonthe carburetor.Youwill need

to remove the throttle arm from the car-

buretor to be able to attach the Z-bend. When

complete, reattach the throttle arm to the car-

buretor.

WHEELAND WHEEL PANTS

PARTSREQUIRED

!1)Assemble andmountingthe wheelpants

as shown in the following pictures.

Vent tube

Fuel fill Tube Fuel Pickup

Tube

Pushrod wire

4MM x 30MM

EXTRA 300S Instruction Manual

!2) 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.

INSTALLING THE MAIN LANDING GEAR

!1) The blind nuts are already mounted in-

side the fuselage.

!2)The holes in the landinggear should be

to accept the mounting bolts

Landing gear

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