Seagull Models TWIN COMANCHE SEA134 User manual

“Graphics and specifications may change without notice”.
MS:134
ASSEMBLY MANUAL
Specifications:
Wingspan----------------------------76.4in(194cm).
Wingarea-----------------830.8sq.in(53.6sqdm).
Weight-------------------------10.6-11lbs(4.8-5kg).
Length------------------------------51.3in(130.3cm).
Engine ------------------0.46-0.55cu.in----2-stroke.
0.72-0.82cu.in---4-stroke.
Radio-------------------6channelswith10 servos.
Retractslandinggear(excluded)-optional.
Electricconversion: optional.

TWIN COMANCHE Instruction Manual.
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INTRODUCTION.
Thank you for choosing the TWIN COMANCHE ARTF by SEAGULL MODELS. The TWIN
COMANCHE was designed with the intermediate/advanced sport flyer in mind. It is a semi scale
airplane whichiseasytoflyandquicktoassemble.Theairframeisconventionallybuiltusingbalsa,
plywoodtomake itstrongerthantheaverage ARTF,yetthedesign allowstheaeroplanetobe kept
light. You will find that most of the work has been done for you already.The motor mount has been
fitted and the hinges are pre-installed . Flying the TWIN COMANCHE is simply a joy.
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manualthoroughlybeforestartingassemblyofyour TWINCOMANCHE .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
proceduresdesignedto helpthenewpilot onhiswaytosuccessful R/Cflight.Theywillalso beable
to advise on any insurance and safety regulations that may apply.
KIT CONTENTS
1
2
7
3
4
8
5
7
10
4
9
10
7
6

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ADDITIONAL ITEMS REQUIRED.
0.46-0.55 2-stroke.
0.72-0.82 4-stroke.
Computer radio with 8 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.
HINGING THE FLAP .
1 Fuselage
2 Left wing panel
3 Right wing panel
4 Tail set (2)
5 Aluminum wing tube
6 wheel (3)
7 Fiberglass cowl
8 Speing landing gear
9 EP conversion pack
10 Hardware bag included
KIT CONTEN.TS
Hinge.
Hinge.
T-pin.
C/Aglue.

TWIN COMANCHE Instruction Manual.
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4) Deflect the aileron and completely
saturate each hinge with thin C/A glue. The
aileronsfrontsurfaceshouldlightlycontact 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.
Thehingeis constructed of aspecial
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:
The control surfaces, including the
ailerons, elevators, and rudder, are
prehinged with hinges installed, but
the hinges are not glued in place. It
is imperative that you properly
adhere the hinges in place per the
steps that follow using a high-quality
thin C/A glue.
2)Removeeachhingefromthewingpanel
and aileron and place a T-pin in the center of
each hinge. Slide each hinge into the aileron
untiltheT-pin issnug against the aileron.This
will help ensure an equal amount of hinge is
oneitherside ofthehingelinewhen the aileron
is mounted to the wing panel.
Note:
1) Carefully remove the aileron from one
of the wing panels. Note the position of the
hinges.
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 the wing panel
andaileron.
HINGING THE AILERON .
Hinge.
Hinge.
T-pin.
C/Aglue.

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8)Afterboth 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.
6) Using C/A remover/debonder and a
papertowel,removeanyexcess C/A glue that
may have accumulated on the wing or in the
aileronhinge area.
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/A penetratesinto
both the aileron and wing panel.
Workthe aileron upand down several
times to “work in” the hinges and
check for proper movement.
Note:
HINGING THE ELEVATOR.
Glue the rudder hinges in place using the
same techniques used to hinge the ailerons.
HINGING THE RUDDER.
Glue the rudder hinges in place using the
same techniques used to hinge the ailerons.
Hinge.
WING TIP ASSEMBLY.
Removecovering.
Fillepoxy.
Covering.
Wing tip.
1) Attach the plastic wing tip to the wing. Use a
hobby knife to remove the covering at the wing
end.
2) Apply the epoxy to the surface of both wing
tip and wing end. The plastic wing tip is held in
position and install it to the wing end. Please
see pictures shown.

TWIN COMANCHE Instruction Manual.
6
Maskingtape.
INSTALL THE AILERONS CONTROL
HORN.
3) Once the epoxy cures and use a covering
iron to seal the covering on the wing and over
the wing tip. 1) Locate the hardware necessary to install
the control horns for the ailerons.
2 sets.
3x35mm.
Install plastic wing tip to wing end.

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2) Position the control horn on the bottom of
the aileron. You will see pre-drill hole 3mm for
the horn mounting screw on the aileron.
3) Place epoxy into hole. This will harden the
threads and prevent the crews from pulling
loose.
3mm.
Aileroncontrolhorn.
4) Thread a control horn end with aluminum
washer, lock nut until the top edge of the end is
18mm from the vase of the horn as shown.
Install the flap control horn using the same
methodas sameas the aileron controlhorns.
INSTALL FLAP CONTROL HORN.
2 sets.
3x35mm.
ALUMINUMWASHER.
ALUMINUMWASHER.
CONTROLHORN
M3 SCREW.
18mm.
Epoxy.
Wing
Wing
Epoxy.
M3LOCKNUT.ALUMINUMWASHER.
ALUMINUMWASHER.
CONTROLHORN
M3 SCREW.
18mm.
Epoxy.
FLAP
FLAP
Epoxy.
M3LOCKNUT.

TWIN COMANCHE Instruction Manual.
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Elevator control horn.
3mm.
Flap control horn.
Install the elevator control horn using the
same method as same as the aileron control
horns.
INSTALL ELEVATOR CONTROL HORN.
2 sets.
3x35mm.
18mm.
Epoxy.
Elevator.
Horizontal
Stabilizer.
INSTALL RUDDER CONTROL HORN.
3mm.
Repeatsteps to install therudder control horn
as same as steps done for ailerons.
2 sets.
3x35mm.
Aluminum Washer.
CONTROLHORN
M3 SCREW.
M3LOCKNUT.
Epoxy.
Aluminum Washer.
Elevator.
Horizontal
Stabilizer.

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Rudder.
Aluminum Washer.
CONTROLHORN
M3 SCREW.
M3LOCKNUT.
Epoxy.
Aluminum Washer.
Fuselage.
Fuselage.
18mm.
Epoxy.
Rudder.
Ruddercontrolhorn.
INSTALLING THE FUSELAGE SERVOS.
Elevator servo.
Rudder servo.
THROTTLE SERVO ARM INSTALLATION.
Installadjustableservoconnectorinthe servo
arm as same as picture below:
AdjustableServo
connector.
Servoarm.
Loctite secure.
1PCS.
1) Installthe rubber grommets and brass
colletsonto thethrottleservo. Testfit the servo
into the aileron servo mount.
 2) Secure the servos with the screws
provided with your radio system.
Because the size of servos differ, you
mayneedto adjust the sizeoftheprecutopen-
ing in the mount. The notch in the sides of the
mount allow the servo lead to pass through.
Elevatorservoarm.
Rudderservoarm.
SERVO GEAR INSTALLATION.

TWIN COMANCHE Instruction Manual.
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Servo for retractable only.
Metalconnector.
Servo arm.
25mm.
Elevatorservoarm.
Rudderservoarm.
Stearingservoarm.
INSTALLING THE FUSELAGE SERVOS.
Throttle servo.
THROTTLE SERVO ARM INSTALLATION.
Installadjustableservoconnectorinthe servo
arm as same as picture below:
AdjustableServo
connector.
Servoarm.
Loctite secure.
1PCS.
Throttle servoarm.
Switch.
Trimand cut.
3/32” Hole.
INSTALLING THE SWITCH.
Installtheswitchintothe precut hole in the
side, in the fuselage.

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INSTALLING THEAILERON - FLAP SERVOS.
Servos. Smallweight.
Thread.
String.
Small weight.
1) Usingasmall weight (Weighted fuelpick-up
workswell)andstring, feedthestring through
the wing as indicated.
2) Place the servo between the mounting
blocksand spaceitfromthehatch.Usea pencil
to mark the mounting hole locations on the
blocks.
Because the size of servos differ, you
mayneed toadjustthesize oftheprecutopen-
ing in the mount. The notch in the sides of
themountallowthe servoleadtopassthrough.
3) Use drill bit in a pin vise to drill the mouting
holes in the blocks.
4) Apply 2-3 drops of thin C/A to each of the
mounting holes. Allow the C/A to cure without
using accelerator.
5) Use dental floss to secure the connection
so they cannot become unplugged.

TWIN COMANCHE Instruction Manual.
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M2x12mm. M2x12mm.
Attach the string to the servo lead and carefully thread it though the wing.
Aileronservo.
Flap servo.
Small weight.
String.

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6) A string has been provided in the wing to
pull the aileron lead through to the wing root.
Remove the string from the wing at the servo
location and use the tape to attach it to the
servoextensionlead.Pullthelead through the
wing and remove the string.
Flap servo.
Aileronservo.
1) Mark the control wire where it crosses the
servo arm hole.
Bend at the mark.
AILERONPUSHRODHORN INSTALLATION
Mark.
Pen.
2)Makea 90-degree bend at the markandcut
offtheexcesswire leaving 8mm past thebend.
Cut.
8mm.
Wing.
Aileron.
M2lock nut.
Snapkeeper.
Servoarm.
3) Connect the linkage as shown and secure
the control wire with a snap keeper.
8mm Snapkeeper.
M2 lock nut. Metalclevis.

TWIN COMANCHE Instruction Manual.
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ENGINE MOUNT INSTALLATION.
1) Locate the items necessary to install the
engine mount included with your model.
2) Usefour4x20mmheadboltsandfour4mm
washers to attach the engine mount rails to
thefirewall.Tighten the screws . Make sure to
use threadlock on the screws to help prevent
them from vibrating loose.
4x20mm.
INSTALLING THE FLAP PUSHROD.
M2lock nut.
Wing.
Flap.
Repeat the procedure for the aileron pushrod.
Repeat the procedure for the other aileron servo.
118mm.
1) Position the engine with the drive washer
(118mm) forward of the firewall as shown.
+ ENGINE .46- .55 : 2 STROKE.

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2) Use a pin drill and 2mm drill bit to drill a
small indentation in the mount for the engine
mounting screw.
3) Use a drill to drill the four holes in the engine
mount rails.
2mm.
2mm.
118mm.
2) Use a pin drill and 2mm drill bit to drill a
small indentation in the mount for the engine
mounting screw.
 1) Positiontheengine withthedrivewasher
(118mm) forward of the firewall as shown.
2mm.
+ ENGINE .72- .82 : 4 STROKE.
Knife.
Epoxy.
Epoxy.
Epoxy.

TWIN COMANCHE Instruction Manual.
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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.
INSTALLING THE STOPPER ASSEMBLY.
2) Usingamodeling knife, cut one length
ofsiliconfuelline. Connectoneend of the line
totheweighted fuel pick up andtheother end
to the nylon pick up tube.
Plywood template.
3) Use a drill to drill the four holes in the engine
mount rails.
2mm.
Knife.
Epoxy.
Epoxy.
Epoxy.

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Blow through one of the lines to en-
sure the fuel lines have not become kinked
inside the fuel tank compartment. Air
should flow through easily.
Fueltank.
Venttube.
Fuel pick up tube.
Fuel fill tube.
Epoxy.
Fueltank.
 8) Use plywood template to hold in place
the fuel tank with C/A glue to secure the fuel
tank inside the fuselage.
Plywood template.
Fueltank.
Epoxy. Plywood template.
3) Carefully bend the second nylon tube
up at a 45º angle. This tube is the vent tube.
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.
Venttube. Fuel pick up tube.
Fuel fill tube.
5) With the stopper assembly in place,
the weighted pick-up should rest away from
therear of the tank and move freely insidethe
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
the stopper assembly tighten the 3 x 20mm
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 TANK INSTALLATION.
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
thetank is installed inside thefuselage,it may
be difficult to determine which is which.
 7) Slide the fuel tank into the fuselage. Guide
the lines from the tank through the hole in the
firewall.

TWIN COMANCHE Instruction Manual.
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Machinescrew M3x25mm.
Pushrodwire.
2) Slide the throttle pushrod wire into the tube.
Position the engine between the mounts. Use
four M3x25mm machine screws to secure the
engine to the mount as shown.
1) Connect the Z-bend in the 450mm throttle
pushrod to the outer hole of the carburetor arm.
3) Reinstall the servo horn by sliding the
connector over the pushrod wire. Center the
throttle stick and trim and install the servo horn
perpendicular to the servo center line.
4) Move the throttle stick to the closed position
and move the carburetor to closed. Use a 2.5mm
hex wrench to tighten the screw that secures
the throttle pushrod wire. Make sure to use
threadlock on the screw so it does not vibrate
loose.
COWLING.
Epoxy.
MOUNTING THE ENGINE.
+ ENGINE .46- .55 : 2 STROKE.
Trim and cut.
1) Slide the fiberglass cowl over the en-
gineandlineupthebackedgeofthecowlwith
themarks you made on thefuselagethen trim
and cut as shown.
Epoxy.

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2) While keeping the back edge of the
cowl flush with the marks, align the front of
thecowlwith the crankshaftoftheengine. The
front of the cowl should be positioned so the
crankshaft is in nearly the middle of the cowl
opening.Use thespinnerbackplateasa guide.
Hold the cowl firmly in place using pieces of
masking tape.
Becauseofthesize of the cowl, it may be nec-
essaryto use a needle valveextensionfor the
highspeedneedlevalve. Makethisoutofsuf-
ficient length 1.5mm wire and install it into the
end of the needle valve. Secure the wire in
placebytightening the set screw intheside of
the needle valve.
Trim and cut.
Machine screw M3x10mm.
Needlevalve.
 3) Installthe muffler andmufflerextension
onto the engine and make the cutout in the
cowl for muffler clearance. Connect the fuel
and pressure lines to the carburetor, muffler
and fuel filler valve. Secure the cowl to fuse-
lage using the M3x10mm screws.
Trim and cut.

TWIN COMANCHE Instruction Manual.
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+ ENGINE .72- .82 : 4 STROKE.
Epoxy.
Machinescrew M4x25mm.
Pushrodwire.
3) Slide the throttle pushrod wire into the tube.
Position the engine between the mounts. Use
four M4x25mm machine screws to secure the
engine to the mount as shown.
1) Slide the pushrod tube in the firewall and
guide it through the fuel tank mount. Use
medium C/A to glue the tube to the firewall and
the fuel tank mount.
2) Connect the Z-bend in the 450mm throttle
pushrod to the outer hole of the carburetor arm.
4) Reinstall the servo horn by sliding the
connector over the pushrod wire. Center the
throttle stick and trim and install the servo horn
perpendicular to the servo center line.
M3x10mm.