Seagull Models DEWOITINE D.520 User manual

MadeinVietnam.
DEWOITINE
D.520
Specifications:
Wingspan------------------------------------------------70.9in--------------------------------------180cm.
Wingarea------------------------------------------------764.2sq.in-------------------------49.3sq.dm.
Approximateflyingweight-------------------------11lbs---------------------------------------4.6-5kg.
Length----------------------------------------------------56.8in-----------------------------------144.2cm.
Recommendedenginesize----------------------.1.20cu.in--------------------------------2-stroke.
----------------------------1.20 cu.in------------------------------- 4-stroke.
RecommendedR/C--------------------------------------------6channelswith9servos.
Flyingskilllevel-----------------------------------------------------Advanced/Intermediate.
ASSEMBLY MANUAL
Kit features.
• Ready-made—minimalassembly&finishingrequired.
• Ready-covered—includingdecals,trim&covering.
• Factory-installedpushrod.
• Comprehensive hardwarepack includingwheels,tank,parts,undercarriage.
• Photo-illustrated step-by-step AssemblyManual.
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
whichiseasytoflyandquicktoassemble.Theairframeisconventionallybuiltusingbalsa,plywood
tomakeitstrongerthantheaverageARTF,yetthedesignallowstheaeroplanetobekeptlight.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
manualthoroughlybeforestartingassemblyofyour DEWOITINED.520.Usethepartslistingbelow
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.
IfyouareinexperiencedwithbasicR/CflightwestronglyrecommendyoucontactyourR/Csupplier
and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training
proceduresdesignedtohelp thenewpilotonhis waytosuccessfulR/Cflight. Theywillalsobeable
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.
Siliconefuel line.
TOOLS & SUPPLIES NEEDED.
Thick cyanoacrylate glue.
30 minute epoxy.
5 minute epoxy.
Hand or electric drill.
Assorted drill bits.
Modellingknife.
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.
HARDWAREPACK
COWLING
Landing gear.....

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NOTE: To avoid scratching your new aero-
planewesuggestthatyoucoveryour
workbench with an old towel. Keep a
couple of jars or bowls handy to hold
the small parts after you open the
bags.
Pleasetrialfitallparts.Makesureyou
have the correct parts and that they
fit and are aligned properly before
gluing! This will ensure proper as-
semblyasthe DEWOITINE D.520is
made from natural materials and
minor adjustments may have to be
made. The paint and plastic parts
used in this kit are fuel proof. How-
ever, they are not tolerant of many
harshchemicalsincludingthefollow-
ing:paintthinner,cyano-acrylateglue
accelerator, cyanoacrylate glue de-
bonderandacetone.Donotletthese
chemicals come in contact with the
coloursonthecoveringandtheplas-
tic 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 eachhinge fromthe wing panel
and aileron and place a T-pin in the center of
each hinge. Slide each hinge into the aileron
untilthe T-pinissnug against theaileron.This
will help ensure an equal amount of hinge is
oneithersideof thehingelinewhen theaileron
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
shouldbe maintainedbetween thewing panel
andaileron.
4)Deflect the aileron and completely
saturate each hinge with thin C/A glue. The
aileronsfrontsurface shouldlightly contactthe
wing during this procedure. Ideally, when the
Thehinge is constructed ofaspecial
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.
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HINGING THE RUDDER.
Glue the rudder hinges in place using the
same tectniques used to hinge the ailerons.
8)After 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
papertowel, removeany excessC/A gluethat
may have accumulated on the wing or in the
aileronhinge area.
5) Turn the wing panel over and deflect the
aileron in the opposite direction from the
opposite side. Apply thin C/A glue to each
hinge,makingsurethatthe C/Apenetratesinto
both the aileron and wing panel.
Aileron control horn: See pictures below.
AILERON CONTROLHORN
Hinge.
Hinge.
Worktheaileronup 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.
ALUMINUMWASHER.
ALUMINUMWASHER.
CONTRONLHORN
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.
CONTRONLHORN
M3 SCREW.
M3LOCKNUT.
Epoxy.
Aluminum Washer.
Elevator.
Aluminum Washer.
CONTRONLHORN
M3 SCREW.
M3LOCK NUT.
Epoxy.
Aluminum Washer.
Wing.Flap.
M3LOCKNUT.
CONTROLHORNM3SCREW.
M3 lock nut.
ALUMINUMWASHER. 18mm.
ALUMINUMWASHER.
Epoxy.
Epoxy.
Flap.
Wing
2 sets.
3x45mm.
2 sets.
3x45mm.

DEWOITINE.Instruction Manual.
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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 INSTALLATION.
4x30mm.
Thread locker glue.
Rudder control horn:
Usingthesametectniques usedaileroncontrol
horn. See picture below.
RUDDER CONTROL HORN.
Elevator control horn.
1 sets.
3x50mm.
Fuselage.
18mm.
Epoxy.
Rudder.
Rudder.
Aluminum Washer.
CONTRONLHORN
M3 SCREW.
M3LOCK 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.
INSTALLING THE STOPPER ASSEMBLY.
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.
Venttube. Fuel pick up tube.
Fuel fill tube.
5) With the stopper assembly in place,
the weighted pick-up should rest away from
therear of the tankand move freelyinside 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 ex-
pands 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
thetank isinstalled inside thefuselage, itmay
be difficult to determine which is which.
2) Usinga modelingknife, cutone length
ofsilicon fuelline. Connect oneendof theline
tothe weightedfuel pickup and the otherend
to the nylon pick up tube.
Fueltank.

DEWOITINE.Instruction Manual.
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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 align-
ment, 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 en-
gine and line up the back edge of the cowl .
COWLING.
MachineScrew4x30mm.
Blow through one of the lines to en-
sure 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
predrilledhole inthefirewall andinto theservo
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.
Pushrodwire.
Trim and cut.
Battery.
Tie wrap.

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Trim and cut.
 3) Install themuffler 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 fuse-
lage 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 propel-
ler comes in contact with it.
INSTALLING THE FUSELAGE SERVOS.
42mm.
Trim and cut.
C/Aglue.
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. Smallweight.
Thread.
String.
Small weight.
Electric wire.
Aileron
Servo.
Throttle servo.
Elevator servo.
Elevator servo.
Rudder
servo.
Throttleservo arm.
Elevatorservo .
Elevatorservo .
Rudderservo .
THROTTLE SERVO ARM INSTALLATION.
Installadjustableservoconnectorinthe servo
arm .
AdjustableServo
connector.
Servoarm.
Loctite secure.
1PCS.
INSTALLING THE SWITCH.
3/32”Hole.
Switch.
Servo tray.
INSTALLING THEAILERON - FLAP SERVOS.
M3 x 10mm.

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AILERONPUSHROD HORNINSTALLATION
M2 lock nut.
M2clevis.
40mm.
75mm.
Aileron.
Wing.
Wing.Aileron.
Wing.
Aileron.
M2lock 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.
M2clevis.
PUSHROD FLAP INSTALLATION.
Flap.
Flap.
Wing.Wing.
M2lock 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
properlyaligntheparts.Usingfast cureepoxy
whenjoiningthewinghalvescouldresultinthe
gluedryingbeforethewinghalvesarealigned
properlywhichmayresultinfailureofthewing
centre section during flight.
74 mm.
40mm.
Flap.
Wing.
Flap.
Flap
Servo.
INSTALLING THE FLAP SERVO.

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Maskingtape.
Epoxy.
 1)Testfitthewingtubeintoeachwinghalf.
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) Removethebracewhensatisfiedwithits
fit in each wing half.Coat both the dihedral
brace with 30 minute epoxy. Next, pour some
epoxyinto the dihedralbox in onewing 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 adhe-
sivecoveringstrip.Applythestriptothecentre
section of the wing starting from the bottom
trailingedge.Wrapthestripallthewayaround
the wing until it meets the trailing edge again.
Trim off any excess strip.
Maskingtape.
Epoxy.
Servo arm.
Loctile
secure.
Adjustableservo
connector.
25mm.
SERVO GEAR INSTALLATION.
Servo for retractable only.
Metalconnector.
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.
Landinggear.

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Wheel Fairing.
M3 x 10mm.
OpenPosition.
servoarm.
M3 x 10mm.
M3 x 10mm.

DEWOITINE.Instruction Manual.
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Hinge.
Hinge.
Hinge.
INSTALLING VERITICAL FIN.
 1) Removethe covering aspicture shown
below.
Aluminiumtube. 3 x 70mm.
Cut.
servoarm. 12mm.
ClosePosition.
Fill epoxy.
Fill epoxy.

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 3) Insert aluminiumtubeinto thecardboard
of fuselage.
4) Slide the two horizontal fin halves to-
getherandcarefullyalignthemat thepossition
onthefuselage.Wipeawayanyexcessepoxy
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.
Coatbothsidesofonehalfof thealuminium
tube with 30 minute epoxy. Next, pour some
epoxy into the cardboard horizontal fin. Use
enough epoxy to fill any gaps.
Epoxy.
Epoxy.
Maskingtape.
Cut.
Fill epoxy.

DEWOITINE.Instruction Manual.
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ELEVATOR - RUDDER PUSHROD HORN
INSTALLATION.
Elevator control horn.
Rudder control horn.
HINGING THE ELEVATOR.
Hinge. C/Aglue.
Hinge.
Attach to servo arm in fuselage. Attach to elevator - rudder control horn.
M2clevis. M2 Lock nut.
Plastic part.

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 1) Elevator and rudder pushrods assembly follow pictures below.
Rudder pushrod.
Control horn.
Elevator Pushrod.
Metalclevis.
Elevator pushrod.
M2lock 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.
Seepicturebelow.
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) Routethe antennain theantenna tube
inside the fuselage and secure it to the bot-
tom 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.
Tail landinggear.
M3x30 mm.
20mm.
ATTACHMENT WING-FUSELAGE.
M3x25 mm.
23mm.
Spring.
C/Aglue.