Made in Vietnam.
DEWOITINE
D.520
Specifications:
Wingspan------------------------------------------------70.9 in-------------------------------------- 180cm.
Wing area------------------------------------------------764.2sq.in------------------------- 49.3 sq.dm.
Approximate flying weight------------------------- 11 lbs---------------------------------------4.6- 5 kg.
Length----------------------------------------------------56.8 in----------------------------------- 144.2cm.
Recommended engine size----------------------.1.20 cu.in-------------------------------- 2-stroke.
----------------------------1.20 cu.in------------------------------- 4-stroke.
Recommended R/C -------------------------------------------- 6 channels with 9 servos.
Flying skill level ----------------------------------------------------- Advanced/Intermediate.
ASSEMBLY MANUAL
Kit features.
• Ready-made—minimal assembly & finishing required.
• Ready-covered—including decals, trim & covering.
• Factory-installed pushrod.
• Comprehensive hardware pack including wheels, tank, parts, undercarriage.
• Photo-illustrated step-by-step Assembly Manual.
MS:99
“Graphics and specfications may change without notice”.
DEWOITINE. Instruction Manual.
2
INTRODUCTION.
Thank you for choosing the DEWOITINE D.520 ARTF by SEAGULL MODELS. The DEWOITINE
D.520 was designed with the intermediate/advanced sport flyer in mind. It is a semi scale airplane
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.The motor mount has been fitted and
the hinges are pre-installed . Flying the DEWOITINE D.520 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 DEWOITINE D.520 . 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.
ADDITIONAL ITEMS REQUIRED.
1.20 2-stroke
1.20 4-stroke engine.
Computer radio with nine servos.
Glow plug to suit engine.
Propeller to suit engine.
Protective foam rubber for radio
system.
Silicone fuel line.
TOOLS & SUPPLIES NEEDED.
Thick 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.
Thread-lock.
Paper towels.
PARTS LISTING.
FUSELAGE ASSEMBLY
(1) Fuselage.
(1) Canopy.
WING ASSEMBLY
(1) Right wing half/ aileron.
(1) Left wing half/ aileron.
Tail section assembly
(1) Horizontal stabilizer/ elevator
halves.
(1) Rudder halves.
Some more parts.
HARDWARE PACK
COWLING
Landing gear.....
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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 DEWOITINE D.520 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 debonder and acetone. Do not let these
chemicals come in contact with the
colours on the covering and the plastic parts.
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.
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 aileron
until the T -pin is snug against the aileron. This
will help ensure an equal amount of hinge is
on either side of the hinge line when the aileron
is mounted to the wing panel.
HINGING THE AILERONS - FLAP.
Note:
Hinge.
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
should be maintained between the wing panel
and aileron.
4)Deflect the aileron and completely
saturate each hinge with thin C/A glue. The
ailerons front surface should lightly contact the
wing during this procedure. Ideally , when the
The hinge is constructed of a special
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.
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:
Hinge.
DEWOITINE. Instruction Manual.
4
HINGING THE RUDDER.
Glue the rudder hinges in place using the
same tectniques used to hinge the ailerons.
8) Af ter both ailerons are securely 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
paper towel, remove any excess C/A glue that
may have accumulated on the wing or in the
aileron hinge area.
5) Turn the wing p anel over and deflect 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.
Aileron control horn:
See pictures below.
AILERON CONTROL HORN
Hinge.
Hinge.
Work the aileron up and down several
times to “work in” the hinges and
check for proper movement.
Note:
2 sets.
3x40mm.
Aileron contronl horn .
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Install the flap control horn using the same
method as with the aileron control horns.
ALUMINUM WASHER.
ALUMINUM WASHER.
CONTRONL HORN
M3 SCREW.
18mm.
Epoxy.
Wing
Wing
FLAP CONTROL HORN.
Epoxy.
Install the elevator control horn using the
same method as with the aileron control
horns.
ELEVATOR CONTROL HORN.
Aileron contronl horn .
Aluminum Washer .
CONTRONL HORN
M3 SCREW.
M3 LOCK NUT.
Epoxy.
Aluminum Washer .
Elevator.
Aluminum Washer .
CONTRONL HORN
M3 SCREW.
M3 LOCK NUT.
Epoxy.
Aluminum Washer .
Wing.
Flap.
M3 LOCK NUT.
CONTROL HORN M3 SCREW.
M3 lock nut.
ALUMINUM WASHER.
18mm.
ALUMINUM WASHER.
Epoxy.
Epoxy.
Flap.
Wing
2 sets.
3x45mm.
2 sets.
3x45mm.
DEWOITINE. Instruction Manual.
6
Mark and drill 4 holes for engine mount.
Insert 4 blind nuts to firewall.
See pictures below.Make yourself the
template of your engine on paper.
ENGINE MOUNT INST ALLATION.
4x30mm.
Thread locker glue.
Rudder control horn:
Using the same tectniques used aileron control
horn. See picture below .
RUDDER CONTROL HORN.
Elevator control horn.
1 sets.
3x50mm.
Fuselage.
18mm.
Epoxy.
Rudder.
Rudder.
Aluminum Washer .
CONTRONL HORN
M3 SCREW.
M3 LOCK NUT.
Epoxy.
Aluminum Washer .
Fuselage.
18mm.
Epoxy.
Elevator.
Rudder control horn.
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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.
INST ALLING THE STOPPER ASSEMBL Y .
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.
Vent tube.
Fuel pick up tube.
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. 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 expands 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
the tank is installed inside the fuselage, it may
be difficult to determine which is which.
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.
Fuel tank.
DEWOITINE. Instruction Manual.
8
4.2mm diameter.
4) Remove the engine. Using an drill bit,
drill the mounting holes through the engine
mount at the four locations marked.
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.
155mm.
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
cheek that all the screws are tight before
proceeding.
1) Slide the fiberglass cowl over the engine and line up the back edge of the cowl .
COWLING.
Machine Screw 4x30mm.
Blow through one of the lines to ensure the fuel lines have not become kinked
inside the fuel tank compartment. Air
should flow through easily.
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.
INSTALLING THE BATTERY.
Pushrod wire.
Trim and cut.
Battery.
Tie wrap.
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Trim and cut.
3) Install the muffler and muffler extension
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 fuselage using the 3x10mm screws.
INSTALLING THE SPINNER.
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.
INSTALLING THE FUSELAGE SERVOS.
42mm.
Trim and cut.
C/A glue.
Machine Screw M3x10mm.
DEWOITINE. Instruction Manual.
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Installing the aileron servo in place using the
same techniques used to flap servo.
Servos.
Small weight.
Thread.
String.
Small weight.
Electric wire.
Aileron
Servo.
Throttle servo.
Elevator servo.
Elevator servo.
Rudder
servo.
Throttle servo arm.
Elevator servo .
Elevator servo .
Rudder servo .
THROTTLE SERVO ARM INSTALLATION.
Install adjustable servo connector in the servo
arm .
Adjustable Servo
connector.
Servo arm.
Loctite secure.
1 PCS.
INSTALLING THE SWITCH.
3/ 32” Hole.
Switch.
Servo tray.
INST ALLING THE AILERON - FLAP SER VOS.
M3 x 10mm.
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AILERON PUSHROD HORN INST ALLA TION
M2 lock nut.
M2 clevis.
40mm.
75mm.
Aileron.
Wing.
Wing.
Aileron.
Wing.
Aileron.
M2 lock nut.
Wing.
Aileron.
Attach the string to the servo lead and carefully thread it though the wing.
String.
Small Weight.
Wing.
Wing rib.
String.
Small Weight.
DEWOITINE. Instruction Manual.
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Wing.
M2 lock nut.
M2 clevis.
PUSHROD FLAP INSTALLATION.
Flap.
Flap.
Wing.
Wing.
M2 lock nut.
Repeat the procedure for the other wing.
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.
74 mm.
40mm.
Flap.
Wing.
Flap.
Flap
Servo.
INSTALLING THE FLAP SERVO.
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Masking tape.
Epoxy .
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.
2) Remove the brace when satisfied with its
fit in each wing half.Coat both 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.
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 .
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.
Masking tape.
Epoxy.
Servo arm.
Loctile
secure.
Adjustable servo
connector.
25mm.
SERVO GEAR INSTALLATION.
Servo for retractable only .
Metal connector.
Servo arm.
25mm.
DEWOITINE. Instruction Manual.
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3 x 25mm.
PUSHROD INSTALLATION.
35mm.
17mm.
200mm.
190mm.
Electric wire.
Wing bottom.
INSTALLING RETRACTABLE
LANDING GEAR.
Epoxy.
Alumium block.
Landing gear.
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Wheel Fairing.
M3 x 10mm.
Open Position.
servo arm.
M3 x 10mm.
M3 x 10mm.
DEWOITINE. Instruction Manual.
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Hinge.
Hinge.
Hinge.
INSTALLING VERITICAL FIN.
1) Remove the covering as picture shown
below.
Aluminium tube. 3 x 70mm.
Cut.
servo arm.
12mm.
Close Position.
Fill epoxy.
Fill epoxy.
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3) Insert aluminium tube into the cardboard
of fuselage.
4) Slide the two horizontal fin halves together and carefully align them at the possition
on the fuselage. Wipe away any excess epoxy
using paper towels.
INSTALLING HORIZONTAL FIN.
1) Remove the covering as same as
pictures shown below.
2) Sand the aluminium tube using
sandpaper. This will improve the bond of the
epoxy to the cardboard horizontal fin.
Coat both sides of one half of the aluminium
tube with 30 minute epoxy. Next, pour some
epoxy into the cardboard horizontal fin. Use
enough epoxy to fill any gaps.
Epoxy.
Epoxy.
Masking tape.
Cut.
Fill epoxy.
DEWOITINE. Instruction Manual.
18
ELEVATOR - RUDDER PUSHROD HORN
INSTALLATION.
Elevator control horn.
Rudder control horn.
HINGING THE ELEVATOR.
Hinge.
C/A glue.
Hinge.
Att ach to servo arm in fuselage.
Attach to elevator - rudder control horn.
M2 clevis. M2 Lock nut.
Plastic part.
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1) Elevator and rudder pushrods assembly follow pictures below.
Rudder pushrod.
Control horn.
Elevator Pushrod.
Metal clevis.
Elevator pushrod.
M2 lock nut.
Elevator.
Rudder.
Throttle.
Elevator.
Elevator.
Rudder.
Throttle.
2) Install servos arm to servos. Notice the
position of the servo arms on the servos. See
picture below.
MOUNTING THE TAIL WHEEL.
See picture below.
M3x25mm.
M3x30mm.
DEWOITINE. Instruction Manual.
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1) Plug the 9 servo leads and the switch
lead into the receiver. Plug the battery pack
lead into the switch also.
INSTALLING THE BATTERY-RECEIVER.
3) Route the antenna in the antenna tube
inside the fuselage and secure it to the bottom of fuselage using a plastic tape.
Receiver.
M3x30mm.
2) Wrap the receiver and battery pack in
the protective foam rubber to protect them
from vibration.
Battery.
T ail landing gear .
M3x30 mm.
20mm.
ATTACHMENT WING-FUSELAGE.
M3x25 mm.
23mm.
Spring.
C/A glue.
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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 4.5 - 5mm back from
the leading edge of the wing, measured at the
wing tip.
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 .
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!
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.
T o correct this, move the battery and receiver
forward orif this is not possible, stick weight
onto the firewall or use a brass heavy hub spinner hub. 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
DEWOITINE D.520 using the control throws
listed at right. We have listed control throws
for both Low Rate (initial test flying/sport flying) and High Rate (aerobatic flying).
Wing bolt.
4.5-5mm.
INITIAL FL YING/SPORT FL YING
Ailerons: 10mm” up 10mm” down.
Elevator: 10mm” up 10mm” down.
Rudder: 15mm” right 15mm” left.
AEROBA TIC FL YING
Ailerons: 15mm” up 15mm” down.
Elevator: 15mm” up 15mm” down.
Rudder: 20mm” right 20mm” left.
Do not use the aerobatic settings for
initial test flying or sport flying.
DEWOITINE. Instruction Manual.
22
7) Check the receiver antenna. It should
be fully extended and not coiled up inside the
fuselage.
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 .
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.
2) Check every bolt and every glue joint
in the DEWOITINE D.520 to ensure that
everything is tight and well bonded.
6) Check to ensure the control surfaces
are moving the proper amount for both low
and high rate settings.
1) Completely charge your transmitter
and receiver batteries before your first day of
flying.
PREFLIGHT CHECK.
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 DEWOITINE D.520.
D) 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.
E) 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.
C) 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.
A) Plug in your radio system per the
manufacturer's instructions and turn everything on.
B) 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.
Check the operation and direction of the
elevator, rudder, ailerons and throttle.
FLIGHT PREPARATION.
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.
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