Seagull Models Boomerang 40 Manuale utente

Specifications

Wingspan _____________________________ 155cm.

Wing area _________________________ 3950 sq cm .

Approximate flying weight_______________ 2.6-2.8kg.

Recommended engine size 0.40-0.46 cu. ins 2-stroke.

Recommended R/C ___________ 4 channel minimum.

Flying skill level___________________ Sports Trainer.

Kitfeatures.

• Ready-made—minimalassembly&finishingrequired.

• Ready-covered—includingdecals,trim&covering.

• Factory-installedpushrod.

• Factory-pinned&gluedcontrolsurfacehingesforultimatesafety.

• Comprehensivehardwarepackincludingwheels,tank,spats,undercarriage& spinner.

• Photo-illustratedstep-by-stepAssemblyManual.

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

ASSEMBLY MANUAL

Additionalitemsrequired.

Engine.

4 Channel or greater Radio Control system.

Glues.

Tools.

Starting Equipment.

MadeinVietnam.

SPORTS TRAINER - ENGINE SIZE.40 - .46 - 2STROKE

BOOMERANG 40. Instruction Manual.

INTRODUCTION.

ThankyouforchoosingtheBoomerang40ARTFbySEAGULLMODELS.TheBoomerang40was

designed with the sports trainer flyer in mind. It is a High-wing aeroplane 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 will find

that most of the work has been done for you already. The pushrods are pre-made to the correct

lengths, the motor mount has been fitted and the hinges are pre-installed and pinned for security.

Flying the Boomerang 40 is simply a joy.

This instruction manual is designed to help you build a great flying aeroplane. Please read this

manual throughly before starting assembly of your Boomerang 40 . 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

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

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

ADDITIONAL ITEMS REQUIRED.

- .40-.46 2-stroke engine.

- 4 channel radio with four servos.

- Glow plug to suit engine.

- Propeller to suit engine.

- Protective foam rubber for radio

system.

- Silicone fuel line.

- Stick-on weights for balance

(If necessary).

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) Pre-installed throttle pushrod &

tube.

- (1) Pre-installed servo tray.

- (1) Pre-installed motor mount.

- (1) Pre-installed rudder pushrod.

- (1) Pre-installed elevator pushrod.

WING ASSEMBLY

- (1) Right wing half with pre-

installedaileron.

- (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-

installedelevatorhalves.

BOOMERANG 40. Instruction Manual.

NOTE:To avoid scratching your new aero-

plane we suggest that you cover

your workbench with an old towel.

Keepacoupleofjarsorbowlshandy

toholdthesmallpartsafteryouopen

the bags.

Please trial fit all parts. Make sure

you have the correct parts and that

they fit and are aligned properly be-

fore gluing! This will ensure proper

assembly as the Boomerang 40 is

made from natural materials and

minor adjustments may have to be

made.

The paint and plastic parts used in

thiskit arefuel proof.However, they

arenottolerantofmanyharshchemi-

cals including the following: paint

thinner, cyano-acrylate glue accel-

erator,cyanoacrylategluede-bonder

andacetone.Donotletthesechemi-

calscomeincontactwiththecolours

onthecoveringandtheplasticparts. Masking tape.

Centreline.

2) Remove the brace when satisfied with

its fit ineach wing half. Coat both sides of one

halfofthedihedralbracewith30minuteepoxy.

Next,poursomeepoxyintothedihedralboxin

one wing panel. Make sure you cover the top

andbottomaswellasthesidesofthedihedral

brace. Use enough epoxy to fill any gaps.

 1)Testfitthewingtubeintoeachwinghalf.

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 the edges and ends of the brace until it

fits properly.

WING ASSEMBLY.

NOTE: We highly recommend using 30

minute epoxy as it is stronger and provides

more working time, allowing the builder to

properlyaligntheparts.Usingfastcureepoxy

whenjoiningthewinghalvescouldresultinthe

gluedryingbeforethewinghalvesarealigned

properlywhichmayresultinfailureofthewing

centre section during flight.

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.

Apply masking tape at the wing join to hold

the wing halves together securely.

Expoxy.

BOOMERANG 40. Instruction Manual.

Epoxy attach.

4. Once the epoxy has cured, trial fit

both wing halves together. The centre ribs

shouldfittogetherflushwithnogaps.Ifgapsdo

exist, use 220 grit sandpaper and sand down

the high spots on the root ribs and the wing

joineruntilaproperfitisachieved.Thecorrect

amountofdihedralisready-builtintothewings.

With one wing half laid flat on the table, the

other wing tip should be off the table surface.

If this needs to be adjusted, you may do so by

sandingsmallamounts fromthecentreribs or

dihedral brace.

5. Carefullyapplymaskingtapearound

thetopandbottomedge of theroot rib ofeach

winghalftoprotectthemfromdamagecaused

byepoxy.

6. Mixagenerousamountof30minute

epoxy. Coat the exposed half of the dihedral

brace, and the remaining wing joiner box and

both root ribs with epoxy. Slide the two wing

halvestogetherandcarefullyalignthematthe

leading and trailing edges. Wipe away any

excess epoxy using paper towels. Use mask-

ingtapewrappedaroundthecentresectionto

hold the halves in place until the epoxy cures.

1. Installtherubber grommetsand brass

colletsontothe aileron servo. Testfit theservo

into the aileron servo mount.

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. Remove the aileron servo. Place the

mountonto thewing,aligning thecutout inthe

mount with the cutout in the wing. The two

notches in the mount should face the leading

edge of the wing.

3. While holding the servo mount firmly

in place, trace around it using a pen.

4. Remove the mount, and using a mod-

elingknife, carefully removethe covering from

inside the outline you drew.

5. Using 6 Minute Epoxy, glue the servo

mount into place. Remove any excess epoxy

usinga papertowel andrubbing alcohol. Use

piecesofmaskingtape to holdthetrayinplace

until the epoxy fully cures.

INSTALLING THEAILERON SERVO MOUNT.

Servo tray.

 3) Peel off the backing from the self adhe-

sivecoveringstrip.Applythestriptothecentre

section of the wing starting from the bottom

trailingedge.Wrapthestripallthewayaround

the wing until it meets the trailing edge again.

Trim off any excess strip.

8. Peel off the backing from the self

adhesive covering strip. Apply the strip to the

centre section of the wing starting from the

bottomtrailingedge.Wrapthestripalltheway

aroundthewinguntilit meets thetrailing edge

again. Trim off any excess strip.

7. When the epoxy has cured, carefully

remove the masking tape from the wing.

BOOMERANG 40. Instruction Manual.

INSTALLING THE AILERON SERVO.

Install the aileron servo into the servo

mount, withthe outputshaft towards thelead-

ing edge of the wing, using the wood screws

provided with your radio system. Drill 1/16”

pilot holes through the mount before installing

the screws. This will prevent the wood from

splitting.

INSTALLING THEAILERON LINKAGE.

1. Thread one nylon adjustable control

horn onto each aileron torque rod. Thread

the horns on until they are flush with the ends

of the torque rods.

2. Thread one nylon clevis at least 5/16”

onto each of the two threaded wires.

3. Withthe aileronservocentered, install

theservo armontothe servo. Thearmshould

beinstalledsoitisparallelwiththetrailingedge

of the wing.

1. Using a modeling knife, remove the

covering from over the two main gear mount-

ingslots locatedin thebottomof thefuselage.

2. Usingthetwo landinggear straps asa

guide, mark the locations of the four 3mm x

12mmmountingscrews onto thefuselagesur-

face.

Remove covering.

4. Slide the pushrod wires following pic-

tureabove.

Connector.

Pushrod

wire.

C/Aglue fix.

5. With both the aileron servo and the ai-

leronscentered.Tighten thesetscrews onthe

connectors.

INSTALLING THE MAIN GEAR WIRES.

3. The landing gear wire is held in place

using two nylon landing gear straps and four

3mm x 12mm wood screws.

The strapsshould be locatedequal distance

from the inside and outside ends of the wire.

5. Remove the two straps and the gear

wire. Drill four 3/32” pilot holes into the fuse-

lage for the wood screws.

Plastic trap.

Pen.

4. Insert the main gear wire into the

mounting slot.

BOOMERANG 40. Instruction Manual.

2mm.

NOSE GEAR INSTALLATION.

3mm X 12mm.

Installing steering arm as follow.

Adjust the nose gear steering arm until the

arm is parallel with the fire wall.

FUEL TANK.

Steering arm.

Pushrod wire.

Steering arm.

TOOLSREQUIRED

INSTALLING THE STOPPERASSEMBLY.

1. Using a modeling knife, carefully cut

offthe rearportionofone ofthetwonylontubes

leaving 1/2” protruding from the rear of the

stopper. This will be the fuel pick up tube.

2. Usingamodeling knife,cut one length

ofsilicon fuelline (not included)to 2-1/4”long.

Connect one end of the 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.

BOOMERANG 40. Instruction Manual.

4. Carefully heat the vent tube using a

heat gun or lighter to permanently set the

angle of the tube.

FuelPickup

Tube.

FuelFill Tube.

Venttube.

When the stopper assembly is installed in

the tank, the top of the vent tube should rest

justbelowthe top surfaceof thetank. Itshould

not touch the top of the tank.

5. 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.

6. With the stopper assembly in place,

the weighted pickup should rest about 3/8”

awayfromthe rearofthetank andmovefreely

insidethetank. Thetopoftheventtube should

rest just below the top of the tank. It should

not touch the top of the tank.

7. When satisfied with the alignment of

thestopperassemblytightenthe3mmx20mm

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.

Fuel pickup tube.

Top of tank.

Vent tube.

Fuel fill tube.

Pull.

INSTALLING THE FUEL TANK.

Pushrod wire.

Plastic tape.

BOOMERANG 40. Instruction Manual.

Fueltank.

MOUNTING THE ENGINE.

PARTSREQUIRED.

1. Install the pushrod housing through the

predrilledholein thefirewalland into theservo

compartment. The pushrod housing should

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

Make a Z-Bend 1/4" from one end of the plain

wire pushrod.

2. Place your engine onto the engine

mount. Adjust the engine is centered of the

edges of the engine case.

4. Remove the engine. Using an drill bit,

drill the mounting holes through the engine

mount at the four locations marked.

5. Bolt the engine to the engine mount

using the four machine screws. Double

cheek that all the screws are tight before

proceeding.

6. Attach the Z-Bend in the pushrod wire

to the throttle arm on the carburetor. You will

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.

3. When you are satisfied with the align-

ment, mark the locations of the engine

mounting.

2. Use pieces off foam rubber to hold the

tank in place. Be careful the tank or the foam

doesn’t interfere with the pushrods. Cut the

fuel line in the middle of the loop. Keep track

of which one is for the fuel pick-up and which

one is for the muffler pressure.

Blow throughthe tubestomake surethe

lines have not become kinked during

installation.

110mm.

3mm X 25mm.

2.5mm.

Pushrod wire.

Fuelpickup

tube.

Vent tube.

Fuel fill tube.

BOOMERANG 40. Instruction Manual.

Install the switch into the precut hole in the

servo tray, in the fuselage, from the bottom.

Use the two screws provided with the switch

to secure it in place. Drill two 3/32” holes

through the tray for the screws to pass

through.

INSTALLING THE SWITCH.

Install the spinner backplate, propeller and

spinner cone. The spinner cone is held in

place using two 3mm x 12mm wood screws.

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.

INSTALLING THE SPINNER. INSTALLINGTHEFUSELAGESERVOS.

The top of the stabilizer does not have

the hinge pins exposed.

2. Using a modeling knife, carefully re-

move the covering from over the vertical sta-

bilizermounting slotin thetopof thefuselage.

3. Slidethestabilizer into placein thepre-

cut slot in the rear of the fuselage. The stabi-

lizer should be pushed firmly against the front

of the slot.

HORIZONTAL STABILIZER.

1. Using a ruler and a pen, locate the

centerline of the horizontal stabilizer, at the

trailing edge, and place a mark. Use a tri-

angleandextend thismark,fromback tofront,

across the top of the stabilizer. Also extend

this mark down the back of the trailing edge

of the stabilizer.

Draw centerline.

Remove covering.

Switch.

Elevator servo.

Rudder servo.

Throttle servo.

BOOMERANG 40. Instruction Manual.

1. Slidethevertical stabilizerinto theslot

inthe topof thefuselage. The bottom edgeof

the stabilizer should also be firmly pushed

against the top of the horizontal stabilizer.

2. While holding the vertical stabilizer

firmly in place, use a pen and draw a line on

each side of the vertical stabilizer where it

meets the top of the fuselage.

5. Removethe stabilizer. Usingthe lines

youjust drewas aguide,carefully removethe

covering from between them using a model-

ing knife. VERTICAL STABILIZER

INSTALLATION.

6. Using a modeling knife, carefully re-

move the covering that overlaps the stabilizer

mounting platform sides in the fuselage. Re-

move the covering from both the top and the

bottom of the platform sides.

When cutting through the covering to re-

move it, cut with only enough pressure

toonly cutthrough the coveringitself. Cutting

into the balsa structure may weaken it.

7. When you are sure that everything is

aligned correctly, mix up a generous amount

of 30 Minute Epoxy. Apply a thin layer to the

topand bottomofthe stabilizermounting area

and to the stabilizer mounting platform sides

8. After the epoxy has fully cured, re-

move the masking tape orT-pins used to hold

the stabilizer in place. Carefully inspect the

glue joints. Use more epoxy to fill in any gaps

that may exist that were not filled previously

and clean up the excess using a paper towel

and rubbing alcohol.

in the fuselage. Slide the stabilizer in place

and realign. Double check all of your mea-

surementsonce more beforetheepoxy cures.

Holdthestabilizerin place withT-pinsormask-

ing tape and remove any excess epoxy using

a paper towel and rubbing alcohol.

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.

Remove covering.

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