Seagull Models JU-87 STUKA User manual

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ASSEMBLY MANUAL
Code: SEA284
“ Graphics and specications may change without notice “ .
JU-87 STUKA GIANT SCALE
Specications:
Wingspan---------------90 in (228.6 cm).
Wing area---------------1328.7 sq.in (85.7 sq.dm).
Weight-------------------17.6 lbs (8.0 kg).
Length-------------------68.3 in (173.4 cm).
Gasoline Engine--------38-50cc
Radio--------------------7 channels with 7 servos.

JU-87 Instruction Manual.
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ank you for choosing the JU-87 ARF by SG MODELS . e JU-87 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, ply-
wood 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 JU-87 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 JU-87 . 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
8
3
3
2
2
4
67

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KIT CONTENTS.
SEA284 JU-87 STUKA GIANT
1. Fuselage
2. Wing set
3. Tail set
4. Canopy
5. Cowling
6. Pilot
7. Aluminum wing tube
8. Wheel pants
ADDITIONAL ITEMS REQUIRED.
TOOLS & SUPPLIES NEEDED.
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.
�38-50cc gasoline engine.
�Computer radio with 7 servos.
�Glow plug to suit engine.
�Propeller to suit engine.
�Protective foam rubber for radio
system.
HINGING THE AILERON.
2x10mm
Note: adjust decal rim straight away.

JU-87 Instruction Manual.
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HINGING THE FLAP.

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INSTALL THE AILERONS
CONTROL HORN.
Epoxy.
Epoxy.
Aileron control horn.
Flap control horn.
Epoxy.
Epoxy.
Fiberglass control horn
Fiberglass control horn
INSTALL FLAP CONTROL HORN.
INSTALL LED LIGHT.
Install the ap control horn using the
same method as same as the aileron con-
trol horns.

JU-87 Instruction Manual.
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Epoxy.
HINGING THE FLAP FOR
CENTER WING.
1) Repeat steps to install hinging for
center wing as same as steps done for ai-
lerons.
2) en, t the joiner wire into the ap of
center wing as below pictures.
3) Slide the wing tube into the wing tube
socket.

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4) Slide the wing panel into position,
guiding the extensions from the side
wing into center wing.
INSTALLING THE AILERON 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) 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.

JU-87 Instruction Manual.
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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.
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.

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9) Set the aileron hatch in place and use a
Phillips screw driver to install it with four
wood screws.
INSTALLING THE FLAP SERVO.
Repeat the procedure as above for the
ap servo.
2x10mm
AILERON PUSHROD
INSTALLATION.
Please see below pictures.
100mm
M3 clevis. M3 lock nut.

JU-87 Instruction Manual.
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INSTALLING THE FLAP PUSHROD.
INSTALLING THE LANDING GEAR.
Repeat the procedure as aileron push-
rod.
100mm
M3 clevis. M3 lock nut.

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2mm
2mm

JU-87 Instruction Manual.
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2mm
3x10mm

13
2mm
3x10mm

JU-87 Instruction Manual.
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INSTALLING THE BOMB ON THE
WINGS.
Epoxy.
Epoxy.

15
Epoxy.

JU-87 Instruction Manual.
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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 into all servos. Test t the servo
into the fuselage servo mount.
2) Secure the servos with the screws pro-
vided with your radio system.
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.
INSTALLING THE RECEIVER SWITCH.
Install the switch into the precut hole in
the side, in the fuselage.
3/32” Hole.
Trim and cut.
Epoxy.

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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.
.
Switch.
INSTALLING THE ENGINE SWITCH.
Trim and cut.
3) Carefully bend the second 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 ll tube.
Fuel pick up 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.

JU-87 Instruction Manual.
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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) 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 en-
sure the fuel lines have not become kinked
inside the fuel tank compartment. Air should
ow through easily.
MOUNTING THE ENGINE
Balsa block.
C/A glue.

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5x100 mm
8mm
Blind nut.
6.5 mm
6.5 mm

JU-87 Instruction Manual.
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1) 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.
2) 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.
170mm