Seagull Models HARMON ROCKET III Manuel utilisateur

HARMON ROCKET III

MadeinVietnam.

Kit features.

• Ready-made—minimalassembly&finishingrequired.

• Ready-coveredcovering.

• Photo-illustratedstep-by-stepAssemblyManual.

Specifications

Wingspan----------------------------------------50.4in----------------------------128cm.

Wingarea---------------------------------------558sq.in-----------------------36sq.dm.

Approximate flying weight------------------ 6.2-6.4lbs-------------------- 2.8-2.9kg.

Length--------------------------------------------51.6in----------------------------131cm.

Recommended engine size---------------.40-.46 cu.in-------------------- 2-stroke.

.52-.82 cu.in--------------------4-stroke.

Radio System required 4 channel with 6 servos.

Flying skill level Intermediate/advanced.

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

ASSEMBLY MANUAL

HARMON ROCKET III. Instruction Manual.

INTRODUCTION.

ThankyouforchoosingtheHarmonRocketIIIARTFbySEAGULLMODELS.TheHarmonRocket

IIIwasdesignedwiththeintermediate/advancedsportflyerinmind.Itisa semiscale airplane which

is easy 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

willfindthatmostoftheworkhasbeendoneforyoualready.Flyingthe Harmon RocketIIIissimply

ajoy.

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

manualthoroughlybeforestartingassemblyofyour HarmonRocket III.Usethepartslistingbelow

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

proceduresdesignedtohelpthenewpilotonhiswayto successful R/C flight. They will also be able

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

ADDITIONAL ITEMS REQUIRED.

.40-.46 2-stroke engine

.52-.82 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 with pre-installed

aileron

(1) Left wing half with pre-installed

aileron

(1) Aluminium dihedral brace

Tail section assembly

(1) Horizontal stabilizer with pre-

installed elevator halves

Some more parts.

HARDWAREPACK

COWLING

Landing gear.....

HARMON ROCKET III. 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-

sembly as the Harmon Rocket III is

made from natural materials and

minor adjustments 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.

HARMON ROCKET III. Instruction Manual.

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 control surfaces, including the

ailerons, elevators, and rudder, are

prehinged with hinges installed, but the

hinges are not glued in place. It is

imperativethat you properly adhere the

hingesin place per the steps that follow

usinga high-qualitythin C/A glue.

1) Carefully remove the aileron from one

of the wing panels. Note the position of the

hinges.

2)Remove each hinge from thewing panel

and aileron and place a T-pin in the center of

each hinge. Slide each hinge into the aileron

untiltheT-pinis snugagainst the aileron.This

will help ensure an equal amount of hinge is

oneithersideofthehingelinewhentheaileron

is mounted to the wing panel.

HINGINGTHE AILERONS.

Note:

The hinge is constructed of a special

material that allows the C/A to wick or

penetrateanddistributethroughout the

hinge, securely bonding it to the wood

structureof the wingpanel and aileron.

7) Repeat this process with the other wing

panel, securely hinging the aileron in place.

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.

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,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.

C/Aglue.

T-pin.

HARMON ROCKET III. 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.

Note:Work the aileron up and down several

times to “work in” the hinges and check

for proper movement.

1) Carefully remove the elevator from one

of the horizontal stabilizer panels. Note the

position of the hinges.

2) Remove each hinge from the horizontal

stabilizerpaneland elevator andplace a T-pin

in the center of each hinge. Slide each hinge

intothe elevatoruntil theT-pinis snug against

the elevator. This will help ensure an equal

amount of hinge is on either side of the hinge

line when the elevator is mounted to the

horizontal stabilizer panel.

4)Deflect the elevator and completely

saturate each hinge with thin C/A glue. The

elevators front surface should lightly contact

thehorizontal stabilizer during this procedure.

Ideally, when the hinges are glued in place, a

1/64”gaporlesswillbemaintainedthroughout

the lengh of the elevator to the horizontal

stabilizer panel hinge line.

Note: The hinge is constructed of a special

material that allows the C/A to wick or

penetrateanddistributethroughout the

hinge, securely bonding it to the wood

structure of the horizontal stabilizer

paneland elevator.

5) Turn the horizontal stabilizer panel over

and deflect the elevator in the opposite

directionfromthe opposite side.ApplythinCA

glue to each hinge, making sure that the C/A

penetratesintoboth the elevatorandhorizontal

stabilizer panel.

HINGINGTHE ELEVATORS.

3) Slide the elevator on the horizontal

stabilizer panel until there is only a slight gap.

The hinge is now centered on the horizontal

stabilizer panel and elevator. Remove the T-

pins and snug the elevator against the

horizontal stabilizer panel. A gap of 1/64” or

less should be maintained between the

horizontal stabilizer panel and elevator.

C/Aglue.

6) Using C/A remover/debonder and a

papertowel, remove anyexcessC/A glue that

may have accumulated on the horizontal

stabilizer or in the elevator hinge area.

8) After both elevator are securely hinged,

firmlygrasp the horizontalstabilizer panel and

elevatorto makesure thehinges aresecurely

glued and cannot be pulled out. Do this by

carefully applying medium pressure, trying to

separate the elevator from the horizontal

stabilizer panel. Use caution not to crush the

horizontal stabilizer structure.

7) Repeat this process with the other

horizontalstabilizerpanel,securelyhingingthe

elevator in place.

HARMON ROCKET III. Instruction Manual.

4)Deflect the rudder and completely

saturate each hinge with thin C/A glue. The

rudder front surface should lightly contact the

fuselage 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 rudder to the fuselage panel hinge line.

1) Carefully remove the rudder from one of

the fuselage panel. Note the position of the

hinges.

2) Remove each hinge from the fuselage

panelandrudderandplaceaT-pininthecenter

ofeachhinge.Slide each hinge intotherudder

until the T-pin is snug against the rudder. This

will help ensure an equal amount of hinge is

oneithersideofthehingeline when the rudder

is mounted to the fuselage panel.

Note: The hinge is constructed of a special

materialthat allowstheC/Atowick orpenetrate

and distribute throughout the hinge, securely

bondingittothewoodstructureofthe fuselage

panel and rudder.

3) Slide the rudder on the fuselage panel

until there is only a slight gap. The hinge is

nowcenteredonthefuselagepanelandrudder.

Remove the T-pins and snug the rudder

against the fuselage panel. A gap of 1/64” or

less should be maintained between the

fuselage panel and rudder.

5)Turnthefuselage panelover and deflect

the rudder in the opposite direction from the

opposite side. Apply thin C/A glue to each

hinge,makingsure that the C/Apenetratesinto

the rudder and fuselage panel.

6) Using C/A remover/debonder and a

papertowel, remove anyexcessC/A glue that

may have accumulated on the fuselage or in

the rudder hinge area.

HINGINGTHERUDDER.

C/Aglue.

Hinge.

Note:Work the rudder left and right several

times to “work in” the hinges and check

for proper movement.

HARMON ROCKET III. Instruction Manual.

Expoxy.

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.

Maskingtape.

WING ASSEMBLY.

NOTE: We highly recommend using 30

minute epoxy as it is stronger and provides

more working time, allowing the builder to

properlyalignthe parts. Usingfastcureepoxy

whenjoiningthewinghalvescouldresultinthe

gluedryingbeforethewinghalvesarealigned

properlywhichmayresultinfailureofthewing

centre section during flight.

 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.

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.

Centreline.

Maskingtape.

HARMON ROCKET III. Instruction Manual.

Attach servo lead to the aileron servo.Attach

thestring tothe servo leadandcarefullythread

it though the wing. Once you have thread the

leadthrought the wing,remove the string soit

canuse fortheotherservolead.Tape theservo

lead to the wing to prevent it from falling back

into the wing.

We recommended to use long ser-

vosarm for all servos without throttle

servo.

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.

Install the rubber grommets and brass

colletsonto the aileronservo. Test fit the servo

into the aileron servo mount.

Install the servo into the servo tray.

Using a small weight (Weighted fuel pick-up

workswell) and thread, feedthestring through

the wing as indicated.

Small weight.

Thread.

Wing bottom.

INSTALLING THE AILERON SERVOS.

Remove covering.

Glueattached.

Servo.

Small weight.

Thread.

HARMON ROCKET III. Instruction Manual.

AILERON LINKAGE.

INSTALLING THEAILERON LINKAGE.

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

line as below picture.

Install the aileron servo tray into the servo

mount.

Repeat the procedure for orther wing

haft.

Thread.

Pen.

Straight line.

Servo arm.

Thread.

Small weight.

Plastic tape.

HARMON ROCKET III. Instruction Manual.

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

horns as a guide, drill the mounting holes

through the aileron halves.

5) Mount the control horns by inserting

thescrewsthroughthe control horn basesand

aileron halves, then into the mounting

backplates. Do not overtighten the screws or

the backplates may crush the wood.

6) Thread one nylon adjustable control

hornontoeach aileron control rod. Threadthe

horns on until they are flush with the ends of

the control rods. Repeat the procedure for the other

aileron servo.

Cut.

M2 lock nut. Snapkeepper.

M2clevis.

2) Locate the two nylon control horns,

two nylon control horn backplates and two

machine screws.

ControlHorn.

MountingScrews. Mounting Plate.

2MMx30 MM.

3) Position the aileron horn on the bottom

side of aileron. The clevis attachment holes

should be positioned over the hinge line.

Pen.

Aileron pushrod rod.

Clevis.

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