SG Models NORTH AMERICAN T-28 TROJAN User manual

Instruction Manual.
1
ASSEMBLY MANUAL
Specications:
Wingspan---------------63.0 in (160 cm).
Wing area---------------349.5 sq.in ( 41.9 sq.dm).
Weight-------------------8.8-9.9 lbs ( 4.0 kg).
Length-------------------50.7 in ( 128.7 cm).
Engine-------------------10-15cc
Motor size---------------1200-1500 Watts
Radio--------------------6 channels with 7 servos.
Electric Power Conversion Included.
“ Graphics and specications may change without notice ”. Code: SEA258

North American T-28 Trojan
2
ank you for choosing the NORTH AMERICAN T-28 TROJAN ARF by SG MODELS . e
NORTH AMERICAN T-28 TROJAN 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 conventionally built using balsa, plywood to make it stronger than the average ARF, 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
NORTH AMERICAN T-28 TROJAN 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 NORTH AMERICAN T-28 TROJAN .
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
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
5
2
33
2
4
6
7

Instruction Manual.
3
KIT CONTENTS.
SEA25801 Fuselage
SEA25802 Wing set
SEA25803 Tail set
SEA25804 Canopy
SEA25805 Cowling
SEA25806 Aluminium tube
SEA25807 Pilot
ADDITIONAL ITEMS REQUIRED.
TOOLS & SUPPLIES NEEDED.
HINGING THE FLAP.
�10cc-15cc gasoline engine.
�1200-1500 Watts
�Computer radio with 7 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.

North American T-28 Trojan
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.

Instruction Manual.
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

North American T-28 Trojan
6
Epoxy.
INSTALLING THE AILERON SERVOS.
Servos
.
Small weight
.
Thread
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.

Instruction Manual.
7
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 at-
tach it to the servo extension lead. Pull
the lead through the wing and remove
the string.
9) Set the aileron hatch in place and use a
Phillips screw driver to install it with four
wood screws.
2x10mm

North American T-28 Trojan
8
.
INSTALLING THE FLAP SERVO.
Repeat the procedure for the ap servo.
AILERON PUSHROD
INSTALLATION.
Please see below pictures.
Use a felt tip pen to mark the wire where
it crosses the hole. Use a pair of pliers to
put a shrp 90-degree bend in the wire at
the mark.
.
Mark.
Bend at the mark
8mm
M2 lock nut.
Metal clevis.
Snap keeper.
Snap keeper.
Servo arm.
Fuel tubing.
Hex Nut.
Nylon Snap keeper.
INSTALLING THE FLAP PUSHROD.
Repeat the process for the ap pushrod.

Instruction Manual.
9
STANDARD FIXED LANDING GEAR.
Please see below pictures.
Epoxy.
M3x20mm

North American T-28 Trojan
10
Collar.
Collar.
Epoxy.
M3x20mm

Instruction Manual.
11
Epoxy.
OPTIONAL RETRACTABLE
LANDING GEAR.
Electric retractable landing gear is not
included in this kit, however it is a very
popular add-on as optional. If you want
to use retracts in your T-28 Trojan, we
recommend that you buy a good set of
electric retracts as the Himark AM05
Main Gear and the AM-06 Nose Gear
shown as below. ese retract units will
bolt right into the T-28 Trojan inplace of
the standard xed gear.

North American T-28 Trojan
12
2mm
M3x15mm
Epoxy.
Collar.

Instruction Manual.
13
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.
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.
INSTALLING THE RECEIVER SWITCH.
Trim and cut.

North American T-28 Trojan
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.
Switch.
INSTALLING THE ENGINE SWITCH.
INSTALLING THE NOSE GEAR.
Trim and cut.
.
Switch.
Collar.

Instruction Manual.
15
OPTIONAL RETRACT NOSE GEAR.
Cut.

North American T-28 Trojan
16
2mm
Collar.

Instruction Manual.
17
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
Vent tube. Fuel pick up
Fuel fill tube.
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.
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.
8) Use plywood template to hold in place the
fuel tank with C/A glue to secure the fuel
tank inside the fuselage.
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.

North American T-28 Trojan
18
C/A glue. Balsa wood.
B
A
Ignition Module.
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.
.
ENGINE MOUNT INSTALLATION.
1) Locate the items necessary to install
the engine mount included with your
model.
4x30mm

Instruction Manual.
19
2) Use four 4x30mm 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 vibrating loose.
read locker glue.
MOUNTING THE ENGINE .
1) Position the engine with the drive
washer (145mm) forward of the rewall
as shown.
145mm
2) Use a pin drill and 4mm drill bit to
drill a small indentation in the mount for
the engine mounting screw.
4mm
3) Use a drill to drill the four holes in the
engine mount rails.
4mm
4) On the re wall has the location for the
throttle pusshrod tube (pre-drill).
5) Slide the pushrod tube in the rewall
and guide it through the fuel tank mount.
Use medium C/A to glue the tube to the
rewall and the fuel tank mount.
6) Connect the Z-bend in the 450mm
throttle pushrod to the outer hole of the
carburetor arm.
7) Slide the throttle pushrod wire into
the tube. Position the engine between the
mounts. Use four M4x30mm machine
screws to secure the engine to the mount
as shown.
Machine screw M4x30mm

North American T-28 Trojan
20
Pushrod wire.
8) 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.
9) 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.