Seagull Models CURTISS P-40N WARHAWK User manual

WWW.SEAGULLMODELS.COM
1
ASSEMBLY MANUAL
www.seagullmodels.com
“ Graphics and specications may change without notice ”.
Code: SEA250
(SEA250S)
Specications:
Wingspan---------------80 in ( 203.2 cm).
Wing area---------------1094.3 sq.in ( 70.6 sq.dm).
Weight-------------------15.4 -15.9 lbs ( 7.0-7.2 kg).
Length-------------------63.6 in ( 161.5 cm).
Engine-------------------33-38cc
Motor size---------------Power 160
Radio--------------------6 channels with 10 servos.
Electric Power Conversion Optional.
( SEA250P)

Curtiss P-40N Warhawk Instruction Manual.
2
ank you for choosing the CURTISS P-40N WARHAWK ARTF by SEAGULL MODELS
COMPANY LTD,. e CURTISS P-40N WARHAWK was designed with the intermediate/
advanced sport yer in mind. It is a semi scale airplane which is easy to y and quick to as-
semble. e 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 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 CURTISS P-40N WARHAWK 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 CURTISS P-40N WARHAWK . Use the
parts listing below to indentify all parts.
Please be awere 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 & 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
1
22
3
3
6
574

WWW.SEAGULLMODELS.COM
3
KIT CONTENTS.
SEA25001 Fuselage
SEA25002 Wing set
SEA25003 Tail set
SEA25004 Canopy
SEA25005 Cowling
SEA25006 Aluminium tube
SEA25007 Pilot
ADDITIONAL ITEMS REQUIRED.
TOOLS & SUPPLIES NEEDED.
HINGING THE FLAP.
�33cc-38cc gasoline engine.
�Power 160
�Computer radio with 10 servos.
�Glow plug to suit engine.
�Propeller to suit engine.
�Protective foam rubber for radio
system.
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.

Curtiss P-40N Warhawk Instruction Manual.
4
HINGING THE AILERON.
Note : e control surfaces, including the ai-
lerons, elevators, and rudder, are prehinged
with hinges installed, but the hinges are not
glued in place. It is imperative that you prop-
erly adhere the hinges in place per the steps
that follow using a high-quality thin 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 the wing panel
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. is will help ensure an equal amount
of hinge is on either side of the hinge line
when the aileron is mounted to the aileron.
3) Slide the wing panel on the aileron until
there is only a slight gap. e hinge is now
centered on the wing panel and aileron. Re-
move the T-pins and snug the aileron against
the wing panel. A gap of 1/64” or less should
be maintained between the wing panel and
aileron.
Hinge.
4) Deect the aileron and completely satu-
rate each hinge with thin C/A glue. e ailer-
ons front surface should 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 : e hinge is constructed of a spe-
cial 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.
in CA.

WWW.SEAGULLMODELS.COM
5
5) Turn the wing panel over and deect the
aileron in the opposite direction from the
opposite side. Apply thin C/A glue to each
hinge, making sure that the C/A penetrates
into both the aileron and wing panel.
6) Using C/A remover/debonder and a pa-
per towel, remove any excess C/A glue that
may have accumulated on the wing or in the
aileron hinge area.
7) Repeat this process with the other wing
panel, securely hinging the aileron in place.
8) Aer both ailerons are securely hinged,
rmly grasp the wing panel and aileron to
make sure the hinges are securely glued and
cannot be pulled out. Do this by carefully ap-
plying medium pressure, trying to separate
the aileron from the wing panel. Use caution
not to crush the wing structure.
Work the aileron up and down sev-
eral times to “work in” the hinges
and check for proper movement.
Note :
INSTALL THE AILERONS
CONTROL HORN.
Fiberglass control horn
Epoxy.
Epoxy.
Aileron control horn.
INSTALL FLAP CONTROL HORN.
Install the ap control horn using the
same method as same as the aileron con-
trol horns.
Fiberglass control horn
Epoxy.

Curtiss P-40N Warhawk Instruction Manual.
6
Epoxy.
WING ASSEMBLY.
Please see below pictures.
Attach the aluminum tube into wing.
INSTALLING THE AILERON SERVOS.
Servos
.
Small weight
.
Thread
Epoxy.

WWW.SEAGULLMODELS.COM
7
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) Using a small weight (Weighted fuel
pick-up works well) and string, feed the
string through the wing as indicated.
2) Place the servo between the mounting
blocks and space it from the hatch. Use a
pencil to mark the mounting hole loca-
tions on the blocks.
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.
C/A glue
5) Use dental oss to secure the connec-
tion so they cannot become unplugged.
6) Secure the servo to the aileron hatch
using Phillips screwdriver and the screws
provided with the servo.
7) 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
8) 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.

Curtiss P-40N Warhawk Instruction Manual.
8
.
9) Set the aileron hatch in place and use a
Phillips screw driver to install it with four
wood screws.
2x10mm
INSTALLING THE FLAP SERVO.
Repeat the procedure for the ap servo.
AILERON PUSHROD HORN
INSTALLATION.
Please see below pictures.
60mm

WWW.SEAGULLMODELS.COM
9
35mm
M3 clevis. M3 lock nut.
M3 clevis. M3 lock nut.
INSTALLING THE FLAP PUSHROD.
Repeat the procedure for the aileron
pushrod.
SERVO ROTATING RETRACT
LANDING GEAR.
Please see below pictures.

Curtiss P-40N Warhawk Instruction Manual.
10
45mm
M3 clevis. M3 lock nut.
3x25mm

WWW.SEAGULLMODELS.COM
11
Epoxy.
Epoxy.
Collar.
Collar.

Curtiss P-40N Warhawk Instruction Manual.
12
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 onto all servos. Test t the servos
into the servo mounts.
2) Secure the servos with the screws pro-
vided with your radio system.
Rudder servo.
Elevator servo.
Elevator servo.
rottle servo.
THROTTLE SERVO ARM
INSTALLATION.
Install adjustable servo connector in the
servo arm as same as picture below:
Servo arm.
Adjustable servo
connector.
Loctite secure.
rottle servo arm.
Install the switch into the precut hole in
the side, in the fuselage.
3/32” Hole.
Trim and cut.
INSTALLING THE RECEIVER SWITCH.

WWW.SEAGULLMODELS.COM
13
.
Switch.
INSTALLING THE ENGINE SWITCH.
Trim and cut.
.
Switch.
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.
A
B
3) Carefully bend the second nylon tube up
at a 45º angle. is tube is the vent tube.
4) Test t the stopper assembly into the tank.
It may be necessary to remove some of the
ashing around the tank opening using a
modeling knife. If ashing is present, make
sure none falls into the tank.
Vent tube. Fuel pick up
Fuel fill tube.

Curtiss P-40N Warhawk Instruction Manual.
14
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
the tank is installed inside the fuselage, it may
be dicult to determine which is which.
7) Slide the fuel tank into the fuselage. Guide
the lines from the tank through the hole in
the rewall.
Please see below pictures.
8) Use plywood template to hold in place the
fuel tank with C/A glue to secure the fuel
tank inside the fuselage.
A
9) Connect the lines from the tank to the en-
gine and muer. e vent line will connect
to the muer and the line from the clunk to
the carburetor.
Vent tube.
Fuel pick up tube. Fuel ll tube.
Blow through one of the lines to ensure
the fuel lines have not become kinked inside
the fuel tank compartment. Air should ow
through easily.
MOUNTING THE ENGINE .
C/A glue. Balsa wood.
B
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.
6) When satised with the alignment of the
stopper assembly tighten the 3 x 20mm ma-
chine screw until the rubber stopper expands
and seals the tank opening. Do not over-
tighten the assembly as this could cause the
tank to split.

WWW.SEAGULLMODELS.COM
15
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.
5x80mm

Curtiss P-40N Warhawk Instruction Manual.
16
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.
COWLING.
Please see these below pictures.
Cut.
1) With the muer, needle valve, and spark/
glow plug removed from the engine, slide
the cowl in place over the engine. Temporar-
ily install the propeller and spinner in order
to nd the exact location of the cowl. When
satised with the cowl placement, secure the
cowl to the fuselage using masking tape.

WWW.SEAGULLMODELS.COM
17
3x10mm
2) Install the muer and muer extension
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 fuse-
lage using the M3x10mm screws.
e propeller should not touch any
part of the spinner cone. If it does, use a
sharp modeling knife and carefully trim
away the spinner cone where the propel-
ler comes in contact with it.
INSTALLING THE SPINNER.
INSTALL ELEVATOR CONTROL HORN.
Fiberglass control horn
HINGING THE ELEVATOR.
Glue the elevator hinges in place using the
same techniques used to hing the ailerons.

Curtiss P-40N Warhawk Instruction Manual.
18
Epoxy.
Elevator berglass control horn.
Epoxy.
Use knife to remove covering
INSTALL RUDDER CONTROL HORN.
Repeat steps to install the rudder control
horn as same as steps done for ailerons.
Fiberglass control horn
Epoxy.
Rudder berglass control horn.
INSTALL RUDDER HINGE.
Glue the rudder hinges in place using
the same techniques used to hinge the el-
evator.

WWW.SEAGULLMODELS.COM
19
INSTALLING HORIZONTAL
STABILIZER.
90º
Vertical
Stabilizer.
Horizontal
Stabilizer.
1) Locate items necessary to install eleva-
tor pushrod.
Elevator control horn.
2) Elevator pushrods assembly as pic-
tures below.
ELEVATOR PUSHROD HORN
INSTALLATION.
M2 lock nut.
M2 clevis.
8mm

Curtiss P-40N Warhawk Instruction Manual.
20
8mm
Elevator pushrod.
2) Rudder pushrods assembly as pictures
below.
RUDDER PUSHROD HORN
INSTALLATION.
1) Locate items necessary to install rud-
der pushrod.
Rudder control horn.
M2 lock nut.
M2 clevis.
8mm
8mm