Seagull Models Boomerang 40 Manual de usuario

Specifications

Wing span ____________________________ 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 channels minimum.

Flying skill level___________________ Sports Trainer.

Electric conversion: optional

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

Additionalitems required.

Engine.

4 Channels or greater Radio Control system.

Glues.

Tools.

Starting Equipment.

Madein Vietnam.

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 hiswayto successfulR/Cflight. Theywillalso beable

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

ADDITIONAL ITEMS REQUIRED.

- .40-.46 2-stroke engine.

- 4 channels 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) Aluminium wing tube.

- (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

thiskitare fuel proof. However, they

arenottolerantofmanyharshchemi-

cals including the following: paint

thinner, cyano-acrylate glue accel-

erator,cyanoacrylategluede-bonder

andacetone.Donotletthesechemi-

calscomeincontactwiththecolours

onthecoveringandtheplasticparts.

2)Removeeach hinge fromthewingpanel

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 on eithersideofthe hingelinewhen

the aileron is mounted to the aileron.

The control surfaces, including the

ailerons, elevators, and rudder, are

prehinged with hinges installed, but the

hinges are not glued in place. It is

imperativethatyouproperlyadherethe

hingesinplaceperthestepsthatfollow

using a high-quality thin C/A glue.

Note:

HINGING THE AILERONS.

Hinge.

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.Agap of 1/64” or less

shouldbemaintainedbetweenthewingpanel

andaileron.

1) Carefully remove the aileron from one

of the wing panels. Note the position of the

hinges.

C/Aglue.

BOOMERANG 40. Instruction Manual.

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.

6) Using C/A remover/debonder and a

papertowel,removeanyexcess C/A glue that

may have accumulated on the wing or in the

aileronhingearea.

5)Turnthe wing panel over and deflectthe

aileron in the opposite direction from the

opposite side. Apply thin C/A glue to each

hinge,making surethattheC/Apenetratesinto

both the aileron and wing panel.

Workthe aileronupand downseveral

times to “work in” the hinges and

check for proper movement.

Note:

4) Deflect the aileron and completely

saturate each hinge with thin C/A glue. The

aileronsfrontsurface should lightlycontactthe

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.

Thehingeis constructedofa special

material that allows the C/A to wick

or penetrate and distribute

throughout the hinge, securely

bonding it to the wood structure of

the wing panel and aileron.

Note:

Epoxy.

HINGING THE ELEVATOR.

Glue the elevator hinges in place using the

same techniques used to hinge the ailerons.

C/Aglue.

BOOMERANG 40. Instruction Manual.

Maskingtape.

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

properlyalign theparts.Usingfastcure epoxy

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.

HINGING THE RUDDER.

Glue the rudder hinges in place using the

same techniques used to hinge the ailerons.

Epoxy attach.

 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.

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

sandingsmallamountsfrom the centreribsor

dihedral brace.

Epoxy.

BOOMERANG 40. Instruction Manual.

5. Carefullyapplymaskingtapearound

thetopandbottomedgeof therootrib 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-

ingtape wrappedaroundthecentresectionto

hold the halves in place until the epoxy cures.

2. Remove the aileron servo. Place the

mountontothewing,aligningthecutoutin the

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,carefullyremovethe covering from

inside the outline you drew.

5. Using 6 Minute Epoxy, glue the servo

mount into place. Remove any excess epoxy

usinga paper towel and rubbing alcohol. Use

piecesofmasking tapetoholdthe trayinplace

until the epoxy fully cures.

INSTALLING THE AILERON SERVO MOUNT.

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

aroundthewinguntilitmeets thetrailingedge

again. Trim off any excess strip.

7. When the epoxy has cured, carefully

remove the masking tape from the wing.

1. Installthe rubber grommets and brass

colletsonto theaileronservo. Testfittheservo

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.

Epoxy. Cut.

Servo tray.

BOOMERANG 40. Instruction Manual.

INSTALLING THE AILERON SERVO.

Install the aileron servo into the servo

mount, withtheoutputshafttowardsthelead-

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.

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. Threadone nylonclevisatleast5/16” onto

each of the two threaded wires.

3. Withtheaileronservocentered,install

theservoarmontotheservo. The arm should

beinstalled soitis parallelwiththetrailingedge

of the wing.

Pushrod

wire.

4. Slide the pushrod wires following pic-

tureabove.

5. With both the aileron servo and the ai-

leronscentered.Tighten the set screwsonthe

connectors.

Wirekeeper.

INSTALLING THEAILERONLINKAGE.

1. Using a modeling knife, remove the

covering from over the two main gear mount-

ingslotslocatedinthebottomofthefuselage.

2. Usingthe two landing gear straps as a

guide, mark the locations of the four 3mm x

12mmmountingscrews onto thefuselagesur-

face.

Remove covering.

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 straps should be located equal distance

from the inside and outside ends of the wire.

BOOMERANG 40. Instruction Manual.

1) Locate the items necessary to install the

engine mount included with your model. .

ENGINE MOUNT INSTALLATION.

4x30mm.

2) Usefour4x30mm head boltsandfour4mm

washers to attach the engine mount rails to

thefirewall.Tightenthescrews.Makesureto

use threadlock on the screws to help prevent

them from vibrating loose.

2mm.

3mm X 12mm.

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.

INSTALLING THE NOSE GEAR WHEEL.

BOOMERANG 40. Instruction Manual.

FUEL TANK.

INSTALLING THE STOPPERASSEMBLY.

1. Using a modeling knife, carefully cut

offtherearportionofoneofthetwonylontubes

leaving 1/2” protruding from the rear of the

stopper. This will be the fuel pick up tube.

2. Usinga modeling knife, cut one length

ofsiliconfuelline(notincluded)to2-1/4”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.

4. Carefully heat the vent tube using a

heat gun or lighter to permanently set the

angle of the tube.

FuelPickup

Tube.

FuelFill Tube.

Vent tube.

When the stopper assembly is installed in

the tank, the top of the vent tube should rest

justbelowthe topsurfaceofthe tank. It should

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”

awayfromtherear of thetankandmove freely

insidethetank. Thetopoftheventtubeshould

rest just below the top of the tank. It should

not touch the top of the tank.

7. When satisfied with the alignment of

thestopperassemblytightenthe 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.

BOOMERANG 40. Instruction Manual.

Fuelpickup

tube.

Venttube.

Fuel fill tube.

INSTALLING THE FUSELAGE SERVOS.

1) Installtherubbergrommetsandbrass

colletsonto thethrottleservo. Testfitthe 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

mayneedto adjustthesizeof theprecutopen-

ing in the mount. The notch in the sides of the

mount allow the servo lead to pass through.

Fueltank.

INSTALLING THE FUEL TANK.

Fueltank.

C/Aglue.

Fuel pickup tube.

Top of tank.

Vent tube.

Fuel fill tube.

 2) Use balsa plywood to help prevent

moveable from transferring to the fuel tank as

shown.

 1) Slide the fuel tank into the fuselage.

Guide the lines from the tank through the hole

in the firewall.

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

thetankisinstalledinsidethefuselage,itmay

be difficult to determine which is which.

C/Aglue.

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