Seagull Models Decathlon 60-85cc-3D User manual

1
Specications:
Wingspan--------------- 122.0 in (310.0 cm).
Wing area--------------- 2487.8 sq.ins (160.5 sq.dm).
Weight------------------- 26.4-27.4 lbs (12.5-13.0kg).
Length------------------- 84.6 in (215.0 cm).
Engine/Motor size----- 60-85cc gasoline.
Radio--------------------- 7 channels with 9 servos.
ASSEMBLY MANUAL
Code : SEA 314

DECATHLON 60-85cc-3D Instruction Manual.
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ank you for choosing the DECATHLON 60-85cc-3D ARTF by SG MODELS . e
DECATHLON 60-85cc-3D was designed with the intermediate/advanced sport y-
er in mind. It is a semi scale airplane which is easy to y and quick to assemble. e air-
frame is conventionally built using balsa, plywood to make it stronger than the av-
erage ARTF, 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 DECATHLON 60-85cc-3D 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 DECATHLON 60-85cc-3D 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 ca-
pable 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
22
4
5
1
8
7
9
12
3
6
11
10

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KIT CONTENTS
SEA314 DECATHLON 60-85cc-3D
1. Fuselage
2. Wing set (2)
3. Tail set (2)
4. Canopy
5. Cowling
6. Wing tube
7. Pilot
8. landing gear
9. Fuel tank
10. Tail wheel
11. Pushrod set
12. Ep Motor box
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.
�60-85cc gasoline engine.
�Computer radio 7 channel with 9
servos.
�Glow plug to suit engine.
�Propeller to suit engine.
�Protective foam rubber for radio
system.
WINGTIP BULBS
Please see below pictures.
2.
1.
3.
Two white lights for cowling and rud-
der, the green light for right wing tip, and
the red light for le wing tip. ey are
designed to operate on voltages 12 volts.
Connect four lights into switch circuit so
that optional the dierent ashes mode.

DECATHLON 60-85cc-3D Instruction Manual.
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9.
8.
10.
11.
4.
5.
6.
7.

5
12.
13.
14.
15.
17.
16.
18.
19.

DECATHLON 60-85cc-3D Instruction Manual.
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20.
21.
22.
23.
INSTALL THE AILERONS
CONTROL HORN
Fiberglass control horn
Epoxy.
1.
24.
2.
3.

7
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.
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.
INSTALLING THE AILERON SERVOS
1.
2.
Use drill bit in a pin vise to drill the mout-
ing holes in the blocks.
Apply 2-3 drops of thin C/A to each of
the mounting holes. Allow the C/A to
cure without using accelerator.
1.5mm
3.
4.
Minimum servo spec.
Torque : 250 oz-in (18 kg-cm) @ 4.8V;
333 oz-in (24 kg-cm) @ 6.0V
Ailerons control horn
Epoxy.
4.
40mm
C/A glue
5.
6.

DECATHLON 60-85cc-3D Instruction Manual.
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Apply 1-2 drops of thin C/A to each of
the mounting tabs. Allow the C/A to cure
without using accelerator.
Remove the string from the wing at the
servo location and use the tape to attach
it to the servo extension lead. Pull the lead
through the wing and remove the string.
C/A glue
10.
9.
11.
Set the aileron hatch in place and use a
Phillips screw driver to install it with four
wood screws.
12.
13.
8.
Secure the servo to the aileron hatch us-
ing Phillips screwdriver and the screws
provided with the servo.
7.
Use dental oss or heatshrunk tube to
secure the connection so they cannot be-
come unplugged.

9
3x10mm
14.
AILERON PUSHROD INSTALLATION
INSTALLING THE FLAP PUSHROD
2.
3.
2.
15.
Attach the ap servo to the ap servo
cover. Center the ap servo (or set the
values to 0 for both up and down) and in-
stall the servo arm perpendicular to the
servo centerline. e clevis will attach to
the arm 13/16 inches (21mm) from the
center of the arm.
150mm.
150mm.
1.
130mm.
1.
130mm.

DECATHLON 60-85cc-3D Instruction Manual.
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Use a pin vise and 3/32-inch (2mm) drill
bit to clear the paint from the ap control
horn.
5.
4.
Attach the ap linkage to the control
horn. Slide the clevis retainer over the
forks of the clevis.
6.
Route the servo lead for the ap servo out
at the root of the wing. Connect the ap
servo to the radio system. With the radio
system on, place the ap servo into posi-
tion.
Attach the clevis to the ap servo arm.
7.
Adjust the linkage so the ap is in the
mid-ap position. It may take a few tries
to properly adjust the linkage.
8.
Once adjusted, make sure all clevis re-
tainers are in position. Apply a drop of
threadlock near the clevis, then tighten
the nut against the clevis to keep the link-
age from changing length inside the wing.
3.

11
11.
12.
13.
Set the ap control at the transmitter to
the down ap position. Adjust the ap
travel at the transmitter until it matches
the control throws listed in this manual.
Fit the ap linkage cover into position.
Check the operation of the ap to make
sure the cover does not interfere with the
ap linkage.
Use canopy glue to attach the cover to the
wing. Use low-tack tape to keep the cover
in position until the adhesive fully cures.
14.
9.
10.
Trim the ap linkage cover using a hobby
knife and hobby scissors.
3x10mm

DECATHLON 60-85cc-3D Instruction Manual.
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INSTALLING LANDING GEAR
Locate items necessary to install Sprin
Landing Gear.
1.
15.3.
2.
4.
5.
6.

13
7.
8.
11.
10.
12.
13.
3x15mm.
9.
Collar.
M3x4mm.
14.
4x25mm.

DECATHLON 60-85cc-3D Instruction Manual.
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15.19.18.
20.
18.
16.
17.
1.
.
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.
Install the rubber grommets and brass
collets into all servos. Test t the servos
into the fuselage servo mounts.

15
7.
6.2.
3.
8.
9.
4.
5.
Elevator servo.
Rudder servo.

DECATHLON 60-85cc-3D Instruction Manual.
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10.
11.
Install the switch into the precut hole in
the side, in the fuselage.
3/32” Hole.
Trim and cut.
1.
2.
.
Switch.
3.
INSTALLING THE ENGINE SWITCH
Trim and cut.
1.
INSTALLING THE RECEIVER SWITCH
Elevator servo arm .
Rudder servo arm.
Switch.
2.
INSTALLING THE STOPPER
ASSEMBLY
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.

17
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.
1.
2.
Carefully bend the second nylon tube up at a
45º angle. is tube is the vent tube.
3.
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.
FUEL TANK INSTALLATION
When satised with the alignment of the
stopper assembly tighten the 3x20mm ma-
chine screw until the rubber stopper expands
and seals the tank opening. Do not overtight-
en the assembly as this could cause the tank
to split.
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.
1.
Fuel pick up tube.Vent tube.
Fuel lltube.
Slide the fuel tank into the fuselage. Guide
the lines from the tank through the hole in
the ewall.
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.
2.

DECATHLON 60-85cc-3D Instruction Manual.
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Epoxy.
3.
4.
Balsa wood.
Fuel pick up tube. Fuel ll tube.
Vent tube.
Connect the lines from the tank to the en-
gine and muer. e vent line will con-
nect to the muer and the line from the
clunk tothe carburetor.
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.
MOUNTING THE ENGINE
Please see below pictures.
2.
1.
4.
3.
5.

19
6.
7.
8.
9.
10.
6x90mm
11.
12.
13.
180mm

DECATHLON 60-85cc-3D Instruction Manual.
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15.19.
16.20.
17.
18.
14.
Ignition Modude.
THROTTLE SERVO ARM
INSTALLATION
Install adjustable servo connector in the
servo arm as same as picture below: