Seagull Models SEA 285 User manual

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Specications:
Wingspan--------------- 80.0 in (203.2 cm).
Wing area--------------- 957.9 sq.ins (61.8 sq.dm).
Weight------------------- 13.7-14.1 lbs (6.2-6.4 kg).
Length------------------- 58.8 in (147.2 cm).
Engine/Motor size----- 0.46-0.55 cu.in 2stroke.
Radio--------------------- 8 channels with 10 servos.
ASSEMBLY MANUAL
Code : SEA 285

Seagull de Havilland Mosquito Twin Engine RC Warbird Instruction Manual.
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ank you for choosing the Seagull de Havilland Mosquito Twin Engine RC War-
bird ARTF by SG MODELS . e Seagull de Havilland Mosquito Twin Engine RC
Warbird was designed with the intermediate/advanced sport yer in mind. It is a semi
scale airplane which is easy to y and quick to assemble. e airframe is convention-
ally built using balsa, plywood to make it stronger than the average ARTF, yet the de-
sign allows the aeroplane to be kept light. You will nd that most of the work has been
done for you already. e motor mount has been tted and the hinges are pre-installed.
Flying the Seagull de Havilland Mosquito Twin Engine RC Warbird is simply a joy.
is instruction manual is designed to help you build a great ying aeroplane. Please read
this manual throughly before starting assembly of your Seagull de Havilland Mosquito
Twin Engine RC Warbird Use the parts listing below to indentify all parts.
Please be aware that this aeroplane is not a toy and if assembled or used incorrectly it is ca-
pable of causing injury to people or property. WHEN YOU FLY THIS AEROPLANE YOU
ASSUME ALL RISK & REPONSIBILITY.
If you are inexperienced with basic R/C ight we strongly recommend you contact your R/C
supplier and join your local R/C model Flying Club. R/C Model Flying Clubs oer a variety
of training procedures designed to help the new pilot on his way to successful R/C ight.
ey will also be able to advise on any insurance and safety regulations that may apply.
INTRODUCTION.
WARNING.
KIT CONTENTS
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KIT CONTENTS.
SEA285 Seagull de Havilland
Mosquito Twin Engine RC Warbird
1. Fuselage
2. Wing set (2)
3. Tail set (2)
4. Canopy
5. Cowling (2)
6. landing gear
7. Pilot
8. wheel (2)
9. Aluminum wing tube
10. EP Conversion pack
ADDITIONAL ITEMS REQUIRED.
TOOLS & SUPPLIES NEEDED.
in cyanoacrylate glue.
Medium cyanoacrylate glue.
30 minute epoxy.
5 minute epoxy.
Hand or electric drill.
Assorted drill bits.
Modelling knife.
Straight edge ruler.
2mm ball driver.
Phillips head screwdriver.
220 grit sandpaper.
90° square or builder’s triangle.
Wire cutters.
Masking tape & T-pins.
read-lock.
Paper towels.
�0.46-0.55 cu.in 2stroke.
�Computer radio 8 with chanlel 10
servos.
�Glow plug to suit engine.
�Propeller to suit engine.
�Protective foam rubber for radio
system.
INSTALL THE AILERONS
CONTROL HORN.
Epoxy.
Fiberglass control horn
Epoxy.
Epoxy.
Fiberglass control horn

Seagull de Havilland Mosquito Twin Engine RC Warbird Instruction Manual.
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INSTALLING THE ALLERON SERVOS.
Epoxy.
Fiberglass control horn

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Because the size of servos dier,
you may need to adjust the size of the
precut opening in the mount. e notch
in the sides of the mount allow the servo
lead to pass through.
1) Place the servo between the mount-
ing blocks and space it from the hatch.
Use a pencil to mark the mounting hole
locations on the blocks.
2) Use drill bit in a pin vise to drill the
mouting holes in the blocks.
4) Use dental oss to secure the connec-
tion so they cannot become unplugged.
5) Secure the servo to the aileron hatch
using Phillips screwdriver and the screws
provided with the servo.
3) Apply 2-3 drops of thin C/A to each
of the mounting holes. Allow the C/A to
cure without using accelerator.
C/A glue
6) Apply 1-2 drops of thin C/A to each of
the mounting tabs. Allow the C/A to cure
without using accelerator.
C/A glue

Seagull de Havilland Mosquito Twin Engine RC Warbird Instruction Manual.
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7) Remove the string from the wing at the
servo location and use the tape to attach it
to the servo extension lead. Pull the lead
through the wing and remove the string.
8) Set the aileron hatch in place and use
a Phillips screw driver to install it with
four wood screws.
2x10mm
AILERON PUSHROD INSTALLATION.
Please see below pictures.
Fuel Tubin g
Hex Nut
Metal R/C Clevis
Pushrod Wire

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INSTALLING THE FLAP SERVO.
Repeat the procedure for the ap servo.
INSTALLING THE FLAP PUSHROD.
Repeat the procedure for the aileron
pushrod.
Fuel Tubin g
Hex Nut
Metal R/C Clevis
Pushrod Wire
.
INSTALLING THE FUSELAGE SERVOS.
.
Because the size of servos dier, you
may need to adjust the size of the precut
opening in the mount. e notch in the
sides of the mount allow the servo lead to
pass through.
1) Install the rubber grommets and brass
collets into all servos. Test t the servos
into the fuselage servo mounts.
2) Secure the servos with the screws pro-
vided with your radio system.
Elevator servo.
Rudder servo.

Seagull de Havilland Mosquito Twin Engine RC Warbird Instruction Manual.
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Trim and cut.
INSTALLING THE RECEIVER SWITCH.
Install the switch into the precut hole in
the side, in the fuselage.
3/32” Hole.
.
Switch.
ENGINE MOUNT INSTALLATION
1) Locate the items necessary to install the en-
gine mount included with your model
2) Use four 4x20mm head bolts and
four 4mm washers to attach the engine
mount rails to the rewall. Tighten the
screws . Make sure to use threadlock on
the screws to help prevent them from vi-
brating loose
Elevator servo arm.
Rudder servo arm.

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Knife.
1) Position the engine with the drive
washe (118mm) forward of the rewall
as shown.
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
4mm.
2mm.
118mm.
Epoxy.

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INSTALLING THE STOPPER
ASSEMBLY.
1) Using a modeling knife, carefully cut
o the rear portion of one of the 3 nylon
tubes leaving 1/2” protruding from the
rear of the stopper. is will be the fuel
pick up tube.
2) Using a modeling knife, cut one length
of silicon fuel line. Connect one end of the
line to the weighted fuel pick up and the
other end to the nylon pick up tube.
3) Carefully bend the second nylon tube up
at a 45º angle. is tube is the vent tube.
Vent tube. Fuel pick up tube.
Fuel fill tube.
4) Test t the stopper assembly into the
tank. It may be necessary to remove some
of the ashing around the tank opening us-
ing a modeling knife. If ashing is present,
make sure none falls into the tank.

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6) When satised 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.
7) Use Strings drawn block to hold in place
the fuel tank with C/A glue to secure the
fuel tank inside the fuselage
5) With the stopper assembly in place, the
weighted pick-up should rest away from the
rear of the tank and move freely inside the
tank. e top of the vent tube should rest
just below the top of the tank. It should not
touch the top of the tank.
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
the tank is installed inside the fuselage, it may
be dicult to determine which is which. Fuel ll tube.
Vent tube.
Fuel pick up tube.
Fuel tank.
Strings drawn.
Blow through one of the lines to
ensure the fuel lines have not become
kinked inside the fuel tank compart-
ment. Air should ow through easily.
MOUNTING THE ENGINE.
+ ENGINE .46- .55 : 2 STROKE.

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1) Connect the Z-bend in the 450mm
throttle pushrod to the outer hole of the
carburetor arm.
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.
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 po-
sition 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.
Machine screw M3x25mm
Pushrod wire INSTALLING RETRACTABLE
LANDING GEAR (OPTIONNAL).
1) Locate the items necessary to install
the retracts landing gear and retract link-
age installation (excluded)

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COWLING
1) Slide the berglass cowl over the en-
gine and line up the back edge of the cowl
with the marks you made on the fuselage
then trim and cut as shown.
cut.
Trim and cut.

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Because of the size of the cowl, it may be
necessary to use a needle valve extension
for the high speed needle valve. Make this
out of sucient length 1.5mm wire and
install it into the end of the needle valve.
Secure the wire in place by tightening the
set screw in the side of the needle valve.
2) While keeping the back edge of the
cowl ush with the marks, align the front
of the cowl with the cranksha of the
engine. e front of the cowl should be
positioned so the cranksha is in near-
ly the middle of the cowl opening. Use
the spinner backplate as a guide. Hold
the cowl rmly in place using pieces of
masking tape.
3) Install the muer and muer ex-
tension onto the engine and make the
cutout in the cowl for muer clearance.
Connect the fuel and pressure lines to
the carburetor, muer and fuel ller
valve. Secure the cowl to fuselage using
the M3x10mm screws.
Trim and cut.

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Needle valve.
Machine screw m3 X10mm.

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1) Locate the items neccessary to install
the electric power conversion included
with your model.
2) Recommend the items necessary to
install the electric power conversion
parts included with your model.
ELECTRIC POWER CONVERSION.

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- Motor: 35-45 size 830 rev
per volt
-ESC: 50A
-Lipo 4s 3200mA
-Elecric propeller:10x7
3) Attach the electric motor box to the
rewall suitable with the cross lines
drawn on the electric motor box and re-
wall. Using epoxy and balsa stick to se-
cure the motor box to the rewall. Please
see pictures below.
4) Attach the motor to the front of the
electric motor box using four 4mm blind
nut, four M4x20mm hex head bolts to se-
cure the motor. Please see picture shown.
M5x25mm and washers.
en, use 5.5mm drill bit to enlarge the
holes on the electric motor box.
5.5mm
4 mm
Blind nut.