Page 1
Specifications
Wingspan ------------------------------------------ 60 in/ 153cm.
Wing area ------------------------------------ 620 sq.in/ 40dm2.
Length -------------------------------------------- 45 in/ 113.7cm.
Approximate flying weight --------- 5.5 - 6.2 lbs/ 2.5-2.8kg.
Recommended engine size - 0.40 -- 0.46 cu. in 2-stroke.
0.52 cu. in 4-stroke.
Recommended R/C ------------------- 4 channel minimum.
Flying skill level ----------------------------- Low wing Trainer.
Kit features.
• Ready-made-minimal assembly & finishing required.
• Factory-installed pushrod.
• Photo-illustrated step-by-step Assembly Manual.
Hand-made Almost Ready to Fly R/C Model Aircraft
ASSEMBLY MANUAL
Additional items required.
Engine.
4 Channel or greater Radio Control system.
Glues.
Tools.
Starting Equipment.
Made in Vietnam.
SEAGULL 40
LOW WING TRAINER
MS:10
“Graphics and specfications may change without notice”.
Page 2
SEAGULL 40 LOW WING TRAINER. Instruction Manual.
2
WING ASSEMBLY.
NOTE: 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 joining the wing halves could result in the
glue drying before the wing halves are aligned
properly which may result in failure of the wing
centre section during flight.
1) Test fit the Wing tube into each wing half.
The brace should slide in easily up to the
centreline that you drew. If not, use 220 grit
sandpaper with a sanding block and sand
down the edges and ends of the brace until it
fits properly.
NOTE:To avoid scratching your new aero-
plane we suggest that you cover
your workbench with an old towel.
Keep a couple of jars or bowls handy
to hold the small parts after you open
the bags.
Please trial fit all parts. Make sure
you have the correct parts and that
they fit and are aligned properly before gluing! This will ensure proper
assembly as the SEAGULL 40 is
made from natural materials and
minor adjustments may have to be
made.
The paint and plastic parts used in
this kit are fuel proof. However, they
are not tolerant of many harsh chemicals including the following: paint
thinner, cyano-acrylate glue accelerator, cyanoacrylate glue de-bonder
and acetone. Do not let these chemicals come in contact with the colours
on the covering and the plastic parts.
INTRODUCTION.
Thank you for choosing the SEAGULL 40 LOW WING TRAINER ARTF by SEAGULL MODELS. The
SEAGULL 40 was designed with the intermediate/advanced sport flyer in mind. It is a low-wing
aeroplane which is easy to fly and quick to assemble. The 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 find that most of the work has been done for you already. Flying the SEAGULL 40 is
simply a joy.
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual thoroughly before starting assembly of your SEAGULL 40. Use the parts listing below 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.
If you are inexperienced with basic R/C flight we strongly recommend you contact your R/C
supplier and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training
procedures designed to help the new pilot on his way to successful R/C flight. They will also be able
to advise on any insurance and safety regulations that may apply.
Wing tube.
Page 3
www.seagullmodels.com
3
3) Peel off the backing from the self adhesive covering strip. Apply the strip to the centre
section of the wing starting from the bottom
trailing edge. Wrap the strip all the way around
the wing until it meets the trailing edge again.
Trim off any excess strip.
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 .
2) Remove the brace when satisfied with
its fit ineach wing half. Coat both sides of one
half of the dihedral brace with 30 minute epoxy.
Next, pour some epoxy into the dihedral box in
one wing panel. Make sure you cover the top
and bottom as well as the sides of the dihedral
brace. Use enough epoxy to fill any gaps.
Glue attach.
Masking tape.
Remove covering.
Wing botton.
Epoxy.
INSTALLING THE AILERON SERVOS.
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.
1) Install the rubber grommets and brass
collets onto the aileron servo. Test fit the
servo into the aileron servo mount.
2) Using a small weight (W eighted fuel pick-
up works well) and thread, feed the string
through the wing as indicated.
Small
weight.
Servos.
Thread.
Page 4
SEAGULL 40 LOW WING TRAINER. Instruction Manual.
4
4) Tape the servo lead to the wing to prevent it from falling back into the wing.
5) Reinstall the servo into the servo mount
and secure the servo inplace using the wood
screws provided with you radio system.
Thread.
Thread.
Wing bottom.
Small weight.
3) Attach servo lead to the aileron servo.
Attach the string to the servo lead and carefully thread 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.
Thread.
Electric wire.
String.
Small weight.
Plastic tape.
Page 5
www.seagullmodels.com
5
2) Locate the two nylon control horns, two
nylon control horn backplates and four
machine screws.
1) Using a ruler & pen to draw a straight
line as below picture.
2) Locate the two nylon control horns,
two nylon control horn backplates and four
machine screws.
3) Position the aileron horn on the bottom
side of aileron. The clevis attachment holes
should be positioned over the hinge line.
(2) 2 x 20mm.
Control Horn.
Mounting Screws.
Mounting Plate.
Repeat the procedure for the other wing
half.
Pen.
Straight line.
4) Using a 1mm drill bit and the control
horns as a guide, drill the mounting holes
through the aileron halves.
5) Mount the control horns by inserting
the 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.
6) Thread one nylon adjustable control
horn onto each aileron control rod. Thread the
horns on until they are flush with the ends of
the control rods.
7) With the aileron servo centered and
the aileron even with the trailing edge of the
wing attach the clevis to the control horn. Mark
the control wire where it crosses the servo
arm hole.
AILERON LINKAGE.
Pen.
Mark point.
Page 6
SEAGULL 40 LOW WING TRAINER. Instruction Manual.
6
3) The landing gear wire is held in place
using two nylon landing gear straps and four
3mm x 10mm wood screws.
The straps should be located equal distance from the inside and outside ends
of the wire.
4) Using the two landing gear straps as
a guide, mark the locations of the four 3 x
10mm mounting screws onto the wing surface.
Gear mounting slot.
Landing gear wire.
8) Make a 90-degree bend at the mark
and cut off the excess wire leaving 10mm past
the bend.
9) Connect the linkage as shown and
secure the control wire with a wire keeper .
Repeat the procedure for the other
aileron servo.
INSTALLING THE MAIN GEAR WIRES.
1) Using a modeling knife, remove the
covering from over the two main gear mounting slots located in the bottom of the wing.
2) Insert the 90º bend of one main gear
wire into the predrilled hole in one mounting
slot.
Cut.
3x10mm.
7mm.
Page 7
www.seagullmodels.com
7
FUEL TANK.
Be careful do not to drill through the
top of the wing!
6) Reinstall the gear wire and install the
straps using the four 3 x 10mm wood screws.
Tighten the screws completely to secure the
gear wire in place.
1) Using a modeling knife, carefully cut
off the rear portion of one of the two nylon tubes
leaving 1/2” protruding from the rear of the
stopper. This will be the fuel pick up tube.
Pen.
Mark point.
5) Remove the two straps and the gear
wire. Drill four 1.5mm pilot holes into the wing
for the wood screws.
1.5mm.
3 x 10mm.
Landing gear wire.
2) Using a modeling knife, cut one length
of silicon fuel line (not included) to 2-1/4” long.
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. This tube is the vent tube.
INST ALLING THE STOPPER ASSEMBL Y.
4) Carefully heat the vent tube using a
heat gun or lighter to permanently set the
angle of the tube.
Vent tube.
Fuel pick up
tube.
Fuel fill tube.
When the stopper assembly is installed in
the tank, the top of the vent tube should rest
just below the top surface of the tank. It should
not touch the top of the tank.
Page 8
SEAGULL 40 LOW WING TRAINER. Instruction Manual.
8
2) Place your engine onto the engine
mount. Adjust the engine is centered of the
edges of the engine case.
3) When you are satisfied with the alignment, mark the locations of the engine
mounting.
MOUNTING THE ENGINE.
1) Install the pushrod housing through the
predrilled hole in the firewall and into the servo
compartment. The pushrod housing should
protrude 1/4" out past the front of the firewall.
Make a Z-Bend 1/4" from one end of the plain
wire pushrod.
4) Remove the engine. Using an drill bit,
drill the mounting holes through the engine
mount at the four locations marked.
Fuel fill tube.
Fuel pick up
tube.
Vent tube.
Battery tray.
C/A Glue attachment.
6) With the stopper assembly in place,
the weighted pick up should rest about 3/8”
away from the rear of the tank and move freely
inside the 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.
7) When satisfied with the alignment of
the stopper assembly tighten the 3mm x 20mm
machine screw until the rubber stopper expands and seals the tank opening. Do not
overtighten the assembly as this could cause
the tank to split.
Using a modeling knife, cut one length of
fuel line 20” long. Connect one line to the vent
tube and one line to the fuel pick up tube on
the stopper. See picture bellow.
Fuel tank.
Blow through the tubes to make sure the
lines have not become kinked during
installation.
5) 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.
Page 9
www.seagullmodels.com
9
3x25mm.
Pushrod wire.
6) Attach the Z-Bend in the pushrod wire to
the throttle arm on the carburetor.
5) Bolt the engine to the engine mount using
the four machine screws. Double check that
all the screws are tight before proceeding.
Installing steering arm as below .
NOSE GEAR INSTALLATION.
2.5mm.
3x25mm.
112mm.
Adjust the nose gear steering arm until the
arm is parallel with the fire wall.
Steering arm.
Adjustable connector.
Page 10
SEAGULL 40 LOW WING TRAINER. Instruction Manual.
10
1) Install the rubber grommets and brass
collets onto the elevator, rudder and throttle
servos. T est fit the servos into the preinst alled
servo tray. Because the size of servos differ, you may need to adjust the size of the
precut openings in the tray.
INSTALLING THE FUSELAGE SERVOS.
1) Install the switch into the precut hole
in the fuselage side. Use the two screws provided with the switch to secure it in place.
INSTALLING THE SWITCH.
Switch.
Install the pushrod wire as shown.
INSTALLING THE SPINNER.
Install the spinner backplate, propeller and
spinner cone. The spinner cone is held in
place using two 3 x 15mm wood screws.
The 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 propeller comes in
contact with it.
Adjustable
Connector.
Page 11
www.seagullmodels.com
11
6) Using a modeling knife, carefully remove the covering that overlaps the stabilizer
mounting platform sides in the fuselage. Remove the covering from both the top and the
bottom of the platform sides.
2) Position the servos into the servo tray
with the output shafts orientated as shown
below. Drill 1/16” pilot holes through the tray
for each of the mounting screws.
Secure the servos with the screws pro-
vided from your radio system.
Throttle.
Elevator.
Rudder.
Switch.
HORIZONTAL STABILIZER.
1) Using a ruler and a pen, locate the
centerline of the horizontal stabilizer, at the trailing edge, and place a mark. Use a triangle
and extend this mark, from back to front,
across the top of the stabilizer. Also extend
this mark down the back of the trailing edge of
the stabilizer.
2) Using a modeling knife, carefully remove
the covering from over the vertical stabilizer
mounting slot in the top of the fuselage.
3) Slide the stabilizer into place in the precut slot in the rear of the fuselage. The stabilizer should be pushed firmly against the front
of the slot.
4) With the stabilizer held firmly in place,
use a pen and draw lines onto the stabilizer
where it and the fuselage sides meet. Do this
on both the right and left sides and top and
bottom of the stabilizer.
5) Remove the stabilizer. Using the lines
you just drew as a guide, carefully remove the
covering from between them using a modeling knife.
When cutting through the covering to
remove it, cut with only enough pressure to
only cut through the covering itself. Cutting into
the balsa structure may weaken it.
Remove covering.
Center line.
Pen.
Page 12
SEAGULL 40 LOW WING TRAINER. Instruction Manual.
12
2) Slide the vertical stabilizer into the slot
in the top of the fuselage. The rear edge of
the stabilizer should be flush with the rear edge
of the fuselage and the lower rudder hinge
should engage the precut hinge slot in the
lower fuselage. The bottom edge of the stabilizer should also be firmly pushed against the
top of the horizontal stabilizer .
3) While holding the vertical stabilizer
firmly in place, use a pen and draw a line on
each side of the vertical stabilizer where it
meets the top of the fuselage.
4) Remove the stabilizer. Using a mod-
eling knife, remove the covering from below
the lines you drew.
Pen.
Hinge slot.
in the fuselage. Slide the stabilizer in place
and realign. Double check all of your measurements once more before the epoxy cures.
Hold the stabilizer in place with T -pins or masking tape and remove any excess epoxy using
a paper towel and rubbing alcohol.
8) After the epoxy has fully cured, re-
move the masking tape or T -pins used to hold
the stabilizer in place. Carefully inspect the
glue joints. Use more epoxy to fill in any gaps
that may exist that were not filled previously
and clean up the excess using a paper towel
and rubbing alcohol.
VERTICAL STABILIZER INSTALLATION.
1) Using a modeling knife, remove the
covering from over the precut hinge slot cut
into the lower rear portion of the fuselage. This
slot accepts the lower rudder hinge.
Hinge.
7) When you are sure that everything is
aligned correctly, mix up a generous amount
of 30 Minute Epoxy. Apply a thin layer to the
top and bottom of the stabilizer mounting area
and to the stabilizer mounting platform sides
Remove covering.
Page 13
www.seagullmodels.com
13
6) When you are sure that everything is
aligned correctly , mix up a generous amount of
30 Minute Epoxy . Apply a thin layer to the mounting slot in the top of the fuselage and to the sides
and bottom of the vertical stabilizer mounting
area. Apply epoxy to the bottom and top edges
When cutting through the covering to re-
move it, cut with only enough pressure
to only cut through the covering itself. Cutting
into the balsa structure may weaken it.
5) Slide the vertical stabilizer back in
place. Using a triangle, check to ensure that
the vertical stabilizer is aligned 90º to the horizontal stabilizer.
90º
Vertical
Stabilizer.
Horizontal
Stabilizer.
of the filler block and to the lower hinge also.
Set the stabilizer in place and realign. Double
check all of your measurements once more before the epoxy cures. Hold the stabilizer in place
with T-pins or masking tape and remove any
excess epoxy using a paper towel and rubbing
alcohol. Allow the epoxy to fully cure before
proceeding.
CONTROL HORN INSTALLATION.
1) Locate the nylon control horns- nylon
control horn backplates and machine screws.
2)The position of elevator control horn on
the left side of elevator . The clevis attach- ment
holes should be positioned over the hinge line.
Control Horn.
Mounting Screws.
Mounting Plate.
(2) 2x20mm.
4) Mount the control horns then into the
mounting backplates. Do not overtighten the
screws or the backplates may crush the wood.
6) Install the rudder control horn using
the same method as with the elevator control
horns.
3) Using a 2mm drill bit and the control
horns as a guide, drill the mounting holes
through the elevator halves.
5) Position the rudder control horn on the
left side of the airplane.
Left side.
Page 14
SEAGULL 40 LOW WING TRAINER. Instruction Manual.
14
ATTACHMENT WING - FUSELAGE.
See picture below:
BALANCING.
1) It is critical that your airplane be balanced correctly . Improper balance will cause
your plane to lose control and crash. The center of gravity is located
9cm back from the lead-
ing edge of the wing, measured at the wing
tip.
1) Plug the five servo leads and the switch
lead into the receiver. Plug the battery pack
lead into the switch also.
2) Wrap the receiver and battery pack in
the protective foam rubber to protect them
from vibration
ELEVATOR-RUDDER PUSHROD
INSTALLATION.
Elevator pushrod.
Rudder pushrod.
Clevis.
Control
horn.
Antenna.
Antenna wire.
Receiver.
Battery.
Tie wrap.
Throttle.
Elevator.
Rudder.
Switch.
Wing bolt.
INSTALLING THE RECEIVER AND BA TTERY.
Adjustable Servo connector.
Servo arm.
(1 PCS).
(2 PCS).
Thread locker glue.
Page 15
www.seagullmodels.com
15
2) If the nose of the plane falls, the plane
is nose heavy. To correct this first move the
battery pack further back in the fuselage. If
this is not possible or does not correct it, stick
small amounts of lead weight on the fuselage
sides under the horizontal stabilizer . If the tail
of the plane falls, the plane is tail heavy. To
correct this, move the battery and receiver for
ward orif this is not possible, stick weight onto
the firewall. When balanced correctly , the airplane should sit level or slightly nose down
when you lift it up with your fingers.
CONTROL THROWS.
1) We highly recommend setting up the
SEAGULL 40 using the control throws listed
at right. We have listed control throws for both
Low Rate (initial test flying) and High Rate
(aerobatic flying).
2) Turn on the radio system, and with the
trim tabs on the transmitter in neutral, center
the control surfaces by making adjustments
to the clevises or adjustable servo connectors.
The servo arms should be centered also.
4) By moving the position of the adjustable control horn out from the control surface,
you will decrease the amount of throw of that
control surface. Moving the adjustable control horn toward the control surface will increase the amount of throw.
3) When the elevator, rudder and aileron
control surfaces are centered, use a ruler and
check the amount of the control throw in each
surface. The control throws should be
measured at the widest point of each surface!
FLIGHT PREPARATION.
A ) Check the operation and direction of
the elevator, rudder, ailerons and throttle.
B) Plug in your radio system per the
manufacturer's instructions and turn everything on.
D) Check the rudder. Looking from behind the airplane, move the rudder stick to the
right. The rudder should move to the right. If it
does not, flip the servo reversing switch on
your transmitter to change the direction.
C) Check the elevator first. Pull back on
the elevator stick. The elevator halves should
move up. If it they do not, flip the servo reversing switch on your transmitter to change
the direction.
INITIAL FLYING/SPORT FLYING
Ailerons: 3/8” up 3/8” down
Elevator: 3/8 ” up 3/8” down
Rudder: 1/2” right 1/2” left
AEROBA TIC FLYING
Ailerons: 1/2” up 1/2” down
Elevator: 5/8” up 5/8” down
Rudder: 1” right 1” left
Do not use the aerobatic settings for
initial test flying or sport flying.
E)Check the throttle. Moving the throttle
stick forward should open the carburetor barrel. If it does not, flip the servo reversing switch
on your transmitter to change the direction.
F)From behind the airplane, look at the
aileron on the right wing half. Move the aileron
stick to the right. The right aileron should move
up and the other aileron should move down. If
it does not, flip the servo reversing switch on
your transmitter to change the direction.
CG=9cm.
Page 16
SEAGULL 40 LOW WING TRAINER. Instruction Manual.
16
5) If your radio transmitter is equipped
with dual rate switches double check that they
are on the low rate setting for your first few
flights.
6) Check to ensure the control surfaces
are moving the proper amount for both low
and high rate settings.
PREFLIGHT CHECK.
1) Completely charge your transmitter
and receiver batteries before your first day of
flying.
2) Check every bolt and every glue joint
in the SEAGULL 40 to ensure that everything
is tight and well bonded.
3) Double check the balance of the airplane. Do this with the fuel tank empty.
4) Check the control surfaces. All should
move in the correct direction and not bind in
any way .
8) Properly balance the propeller . An out
of balance propeller will cause excessive vibration which could lead to engine and/or airframe failure.
We wish you many safe and enjoyable
flights with your SEAGULL 40 LOW WING
TRAINER
.
7) Check the receiver antenna. It should
be fully extended and not coiled up inside the
fuselage.
Loading...