Seagull Models SEA12 User manual

Specifications

Wingspan---------------------------------------60.63in, 1540mm.

Wing area--------------------------------610 sq.in, 37.04sq.dm.

Fuselage length--------------------------------43.7in, 1110mm.

Approximate flying weight---------5.5-5.95lbs, 2500-2700g.

Recommended engine size---------.40-.58 cu.in. 2-stroke.

----------------------------------------------.50-.72 cu.in. 4-stroke.

Recommended R/C-----------------------4 channel minimum.

Flying skill level-------------------------Intermediate/advanced.

Kit features.

• Ready-made—minimalassembly&finishingrequired.

• Factory-installedpushrods.

• Comprehensivehardwarepackincludingwheels,tank,

undercarriage & spinner.

• Photo-illustratedstep-by-stepAssemblyManual.

Hand-madeHand-made

Hand-made Almost RAlmost R

Almost RAlmost R

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y to Fy to F

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ly R/C Modely R/C Model

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y R/C Model

AircraftAircraft

Aircraft

ASSEMBLASSEMBL

ASSEMBLY MANUY MANU

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Additionalitemsrequired.

Engine.

4 Channel or greater Radio Control system.

Glues.

Tools.

Starting Equipment.

MadeinVietnam.

PC-9 semi Scale ARF Model

MS:12

INTRODUCTION.

Thank you for choosing the PC-9 ARTF by SG MODELS. The PC-9 was designed with

the

intermediate/advanced sport flyer in mind. It is a low-wing scale aeroplane which is easy to fly

and

quicktoassemble.Theairframeisconventionallybuiltusingbalsa,plywoodandveneertomake

strongerthantheaverageARTF,yetthedesignallowstheaeroplanetobekeptlight.Youwillfind

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 PC-9 is simply a joy.

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

manualthoroughly before starting assemblyof your PC-9 . Use the partslisting below to identify all

parts.

WARNING.

Pleasebeawarethatthisaeroplaneisnotatoyandifassembledorusedincorrectlyitiscapable

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

proceduresdesignedtohelp thenewpilotonhiswayto successful R/Cflight.Theywillalsobeable

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

ADDITIONAL ITEMS REQUIRED.

* .40-.58 2-stroke engine.

* .50-.72 4-stroke engine.

* 4-channel radio with five 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.

* 6 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.

WING ASSEMBLY

* (1) Right wing half with pre-

installedaileron.

* (1) Left wing half with pre-installed

aileron.

* (1) Aluminium wing dihedral

brace.

TAIL SECTION ASSEMBLY

* (1) Vertical stabilizer with pre-

installedrudder.

* (1) Horizontal stabilizer with pre-

installedelevatorhalves.

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

assemblyasthePC-9 is made from

natural materials and minor adjust-

ments may have to be made.

The paint and plastic parts used in

thiskit are fuel proof. However,they

arenottolerantofmanyharshchemi-

cals including the following: paint

thinner, cyano-acrylate glue accel-

erator,cyanoacrylategluede-bonder

andacetone.Donotletthesechemi-

calscomeincontactwiththecolours

onthecoveringandtheplasticparts.

4)Deflect the aileron and completely

saturate each hinge with thin C/A glue. The

aileronsfrontsurfaceshouldlightlycontactthe

wing during this procedure. Ideally, when the

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 properlyadherethe

hingesin place perthe steps that follow

using a high-quality thin C/A glue.

1)Carefullyremovethe aileron from one of

thewingpanels.Notethepositionofthehinges.

2)Removeeachhingefromthewingpanel

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

each hinge. Slide each hinge into the aileron

untiltheT-pin is snugagainst the aileron.This

will help ensure an equal amount of hinge is

oneithersideof the hingelinewhentheaileron

is mounted to the wing panel.

HINGING THE AILERONS.

Note:

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

shouldbemaintained between thewingpanel

andaileron.

Hinge.

T-pin.

PC-9 Instruction Manual.

8)After both ailerons aresecurely 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)Turnthewingpanelover and deflect the

aileron in the opposite direction from the

opposite side. Apply thin C/A glue to each

hinge,makingsure thattheC/Apenetratesinto

both the aileron and wing panel.

6) Using C/A remover/debonder and a

papertowel,remove any excess C/Agluethat

may have accumulated on the wing or in the

aileronhinge area.

The hinge is constructed of a special

material that allows the C/A to wick or

penetrateanddistributethroughoutthe

hinge, securely bonding it to the wood

structureofthe wing panel andaileron.

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:

C/Aglue.

Work the aileron up and down several

times to “work in” the hinges and check

for proper movement.

Glue the elevator hinges in place using the

same techniques used to hinge the ailerons.

HINGING THE ELEVATOR.

Note:

C/Aglue.

Apply epoxy glue.

Metalwire.

WING ASSEMBLY.

1) Locatethewingdihedralbrace.Usinga

ruler,locateitscentre and draw averticalline.

We highly recommend using 30 minute

epoxy as it is stronger and provides more

working time, allowing the builder to properly

align the parts. Using fast cure epoxy when

joiningthewinghalves could result in theglue

drying before the wing halves are aligned

properlywhichmayresultinfailureofthewing

centre section during flight.

HINGING THE RUDDER.

Glue the elevator hinges in place using the

same techniques used to hinge the ailerons.

2) Testfitthedihedralbraceintoeachwing

half. The brace should slide in easily up to the

centreline that you drew.

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.

Dihedral brace.

Centreline.

3) Removethe bracewhen satisfied with

its fit in each wing half. Coat dihedral brace

with30 minute epoxy.Next, pour someepoxy

into the dihedral box in one wing panel.

4) 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 the trailingedge

again. Trim off any excess strip.

Epoxy.

Maskingtape.

PC-9 Instruction Manual.

Small weight.

Thread.

INSTALLING THE AILERON SERVOS.

1) Installtherubbergrommetsandbrass

collets onto the aileron servo. Test fit the

servo into the aileron servo mount.

Small

weight.

Servo.

Thread.

Remove covering.

Glueattached.

3) Attach servo lead to the aileron servo.

Attach the string to the servo lead and care-

fullythread it though the wing.Once you have

thread the lead throught the wing, remove the

string so it can use for the other servo lead.

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.

Secure the servos with the screws pro-

vided from your radio system.

2) Using a small weight (Weighted fuel

pick-upworkswell)andthread,feedthestring

through the wing as indicated.

Thread.

Small weight.

Thread.

2mm X 20mm.

ControlHorn.

MountingScrews. Mounting Plate.

4) Tape the servo lead to the wing to pre-

vent it from falling back into the wing.

 5) Reinstall the servointo the servomount

and secure the servo inplace using the wood

screws provided with you radio system.

Thread.

Plastic tape.

2) Locate the two nylon control horns,

two nylon control horn backplates and four

machine screws.

3)Positiontheaileronhornonthebottom

side of aileron. The clevis attachment holes

should be positioned over the hinge line.

Pen.

Straight line.

Repeat the procedure for the other wing

half.

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

line as below picture.

AILERON LINKAGE.

PC-9 Instruction Manual.

Cut.

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

horns as a guide, drill the mounting holes

through the aileron halves.

6) Thread one nylon adjustable control

hornontoeachaileroncontrolrod. Threadthe

horns on until they are flush with the ends of

the control rods.

5)Mountthecontrolhornsbyinsertingthe

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.

7) With the aileron servo centered and

the aileron even with the trailing edge of the

wingattachtheclevistothecontrol horn. Mark

the control wire where it crosses the servo

arm hole.

8) Make a 90-degree bend at the mark

andcutoffthe excess wire leaving10mmpast

thebend.

INSTALLING THE MAIN GEAR WIRES.

1) Using a modeling knife, remove the

covering from over the two main gear mount-

ing slots located in the bottom of the wing.

9) Connect the linkage as shown and

secure the control wire with a wire keeper.

Repeat the procedure for the other

aileron servo.

2) Insert the 90º bend of one main gear

wire into the predrilled hole in one mounting

slot.

Remove covering.

Pen.

6) Reinstall the gear wire and install the

straps using the four 3mm x 12mm wood

screws. Tighten the screws completely to se-

cure the gear wire in place.

7) Slide one wheel collar with 3mm x

6mm set screw onto each axle. Push the

wheel collars on as far as they will go and

tighten the set screws.

Be careful not to overtighten the set

screws. Overtightening may cause the

threads to strip.

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 dis-

tance from the inside and outside ends

ofthewire.

4)Usingthetwo landing gear strapsasa

guide, mark the locations of the four 3mm x

12mm mounting screws onto the wing sur-

face.

5) Remove the two straps and the gear

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

for the wood screws.

Be careful do not to drill through the

top of the wing!

8) Slide one 60mm diameter wheel onto

eachaxleandpushthemupagainstthewheel

collars. Slidetheremaining wheel collars with

3mm x 6mm set screws onto the axles. Push

them up against the wheels and tighten the

set screws. The wheels should spin free and

notbindinany way. Ifthey do bind, loosen the

setscrewsintheouterwheelcollarsandmove

the collars out a small amount. Retighten the

set screws.

NOSE GEAR INSTALLATION.

Adjust the nose gear steering arm until the

arm is parallel with the fire wall.

Installing steering arm as below.

Steering arm.

PC-9 Instruction Manual.

Install the pushrod wire as shown.

Adjustable

Connector.

Slide one 60mm diameter wheel collar onto

the axle and tighten. Slide the nose wheel on

and push it up against the wheel collar. Slide

the remaining wheel collar on and push it up

against the wheel and tighten the set screw.

The wheels should spin free and not bind in

any way.

INSTALLING THE NOSE GEAR WHEEL.

1) Using a modeling knife, carefully cut

offthe rearportionofoneofthetwonylontubes

leaving 1/2” protruding from the rear of the

stopper. This will be the fuel pick up tube.

2) Usinga modeling knife, cutone length

ofsilicon fuel line (notincluded) 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.

INSTALLING THE STOPPERASSEMBLY.

FUEL TANK.

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