Seagull Models Aviat A-1C Christen Husky 80 User manual

1
ASSEMBLY MANUAL
Code : SEA 180N
Wingspan------------------------- 80.0 in------------------ 203.0 cm
Wing Arena----------------------- 922.3 sq.in------------ 59.5 sq.dm
Flying Weight-------------------- 11.5 lbs----------------- 5.2 kg
Lenght----------------------------- 50.0 in------------------ 127.0 cm
Recommended engine size-----15-20cc
Radio------------------------------- 6 channels with 7 servos

Aviat A-1C Christen Husky 80” wingspan size 15-20cc Instruction Manual.
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ank you for choosing the Aviat A-1C Christen Husky 80” wingspan size 15-
20cc ARTF by SG MODELS . e Aviat A-1C Christen Husky 80” wingspan size 15-
20cc 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 convention-
ally built using balsa, plywood to make it stronger than the average ARTF, yet the de-
sign 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 Aviat A-1C Christen Husky 80” wingspan size 15-20cc 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 Aviat A-1C Christen Husky 80”
wingspan size 15-20cc 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
1
2 2
5
3 3
4
7
8
9
12
13
14
6
10
14
11

3
HINGING THE FLAP
.
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.
�15-20cc gasoline engine.
�Computer radio 6 channel with 7
servos.
�Glow plug to suit engine.
�Propeller to suit engine.
�Protective foam rubber for radio
system.
KIT CONTENTS
SEA180N Aviat A-1C Christen Husky
80” wingspan size 15-20cc
1. Fuselage
2. Wing set (2)
3. Tail set (2)
4. Canopy (2)
5. Cowling
6. Wing tube
7. Landing gear
8. Tail wheel
9. Fuel tank
10. Pushrod set
11. Ep Motor box
12. Windows
13. Spinner
14. Wing strut (2) 2x10mm
1.
2.
3.
4.

Aviat A-1C Christen Husky 80” wingspan size 15-20cc Instruction Manual.
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Locate the aileron and ap control horns.
e taller control horn is used for the ailer-
ons, and the shorter horn for the aps.
Use sandpaper to scu the bottom of the
aileron and ap control horns. Use a paper
towel and isopropyl alcohol to remove any
oils or debris from the control horns.
Check the t of the control horns to the
aileron and ap. ey should rest ush
against the control surface as shown.
INSTALL THE AILERONS
CONTROL HORN
Ailerons control horn
Place low-tack tape 1/32 inch (1mm)
from the control horn slot. is will pre-
vent epoxy from getting on the control
surface when the control horns are glued
in place.
1.
2.
3.
5.
6.

5
Remove the control horns from the
control surfaces. Apply epoxy to the slot
in the aileron and ap. Make sure the
epoxy gets into the slot for a good bond
between the surfaces and control horn.
4.
5.
Apply epoxy to the area of the control
horns that st into the slots. Use enough
epoxy so the control horns will be fully
bonded to the ed surfaces.
Before the epoxy fully cures, remove
the tape from around the control horn.
is will allow the epoxy to ow around
the control horn, creating a small let
between the control horn and surface for
a ished look and secure bond.
7.
1.
2.
6.
Epoxy
Epoxy
INSTALL FLAP CONTROL HORN
Install the ap control horn using the
same method as same as the aileron con-
trol horns.
Fiberglass control horn
Epoxy

Aviat A-1C Christen Husky 80” wingspan size 15-20cc Instruction Manual.
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3.7.
5.
4.
6.
C/A glue
C/A glue
1.
2.
INSTALL LED LIGHT
Please study images below.
Flap control horn
Led Light Lipo 3S
3.

7
INSTALLING THE AILERON SERVOS
1.
2.
Ailerons servo Flap servo
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.
Use drill bit in a pin vise to drill the
mouting 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.
Use dental oss or heatshrunk tube to
secure the connection so they cannot be-
come unplugged.
C/A glue
5.
Minimum servo spec.
Torque : 80 oz-in (5.8 kg-cm) @ 4.8V;
100 oz-in (7.2 kg-cm) @ 6.0V

Aviat A-1C Christen Husky 80” wingspan size 15-20cc Instruction Manual.
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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 attach it
to the servo extension lead. Pull the lead
through the wing and remove the string.
9.
10.
11.
12.
C/A glue

9
AILERON PUSHROD INSTALLATION
Please see below pictures.
60mm
M3 clevis. M3 lock nut.
INSTALLING THE FLAP SERVO
Repeat the procedure for the ap servo.
Set the aileron hatch in place and use a
Phillips screw driver to install it with four
wood screws.
13.
14.
1.
2.
1.
5.
4.
3.
2x10mm

Aviat A-1C Christen Husky 80” wingspan size 15-20cc Instruction Manual.
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40mm
80mm
M3 clevis M3 lock nut
INSTALLING THE FLAP PUSHROD
Repeat the procedure for the aileron
pushrod.
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.
rottle servo Elevator servo
Rudder servo
Tail wheel
Secure the servos with the screws pro-
vided with your radio system.
Elevator servo
rottle servo
THROTTLE SERVO ARM
INSTALLATION
Install adjustable servo connector in the
servo arm as same as picture below:
1.
Rudder servo
1.
1.
2.
2.
3.

11
INSTALLING THE RECEIVER SWITCH
Install the switch into the precut hole in
the side, in the fuselage.
3/32” Hole
.
INSTALLING THE ENGINE SWITCH
rottle servo arm
Elevator servo arm
Rudder servo arm
Trim and cut
Switch
Trim and cut
LANDING GEAR INSTALLATION
Switch
Please study images below.
2.
4.
5.
1.
1.
2.
3.

Aviat A-1C Christen Husky 80” wingspan size 15-20cc Instruction Manual.
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3x10mm
3x15mm
3x15mm
2.6.
3.7.
4.8.
5.9.

13
3x10mm
10.14.
11.15.
12.16.
13.17.

Aviat A-1C Christen Husky 80” wingspan size 15-20cc Instruction Manual.
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18.22.
23.
24.
25.
19.
20.
21.

15
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.
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.
Carefully bend the second nylon tube up at
a 45º angle. is tube is the vent tube.
3.
1.
Vent tube
Fuel ll tube
Fuel pick up tube
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.
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.
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.
Slide the fuel tank into the fuselage. Guide
the lines from the tank through the hole in
the ewall.
Use plywood template to hold in place the
fuel tank with C/A glue to secure the fuel-
tank inside the fuselage.
1.
2.

Aviat A-1C Christen Husky 80” wingspan size 15-20cc Instruction Manual.
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Fuel pick up tube Fuel ll tube
Vent tube
Connect the lines from the tank to the
engine and muer. e vent line will
connect 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
Locate the items necessary to install the
engine mount included with your model.
Use four 4x30mm head bolts and four
4mm washers to attach the engine mount
rails to the rewall. Tighten the screws .
Make sure to use threadlock on the
screws to help prevent them from vibrat-
ing loose.
6.
1.
2.
3.
4.
5.

17
ead locker glue
Position the engine with the drive washer
(145mm) forward of the ewall as shown.
Use a pin drill and 4mm drill bit to drill
a small indentation in the mount for the
engine mounting screw.
Use a drill to drill the four holes in the
engine mount rails.
145mm
On the e wall has the location for the
throttle pusshrod tube (pre-drill).
Slide the pushrod tube in the ewall and
guide it through the fuel tank mount. Use
medium C/A to glue the tube to the e-
wall and the fuel tank mount.
Connect the Z-bend in the 450mm
throttle pushrod to the outer hole of the
carburetor arm.
Slide the throttle pushrod wire into the
tube. Position the engine between the
mounts. Use four M4x30mm machine
screws to secure the engine to the mount
as shown.
4mm
2.5.
6.
3.
4.

Aviat A-1C Christen Husky 80” wingspan size 15-20cc Instruction Manual.
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7.11.
8.12.
9.13.
10.14.
4x25mm
Pushrod wire
M4 lock Nut
Ignition Modude

19
15.18.
1.
2.
3.
16.
17.
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.
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.
COWLING

Aviat A-1C Christen Husky 80” wingspan size 15-20cc Instruction Manual.
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Tape the cowl to the fuselage using
low-tack tape.
Use a drill and drill bit to drill the holes
for the cowl mounting screws. Make sure
the cowl position is correct before drill-
ing each hole.
Because of the size of the cowl, it may be nec-
essary to use a needle valve extension for the
high speed needle valve. Make this out of suf-
cient length 1.5mm wire and install it into
the end of the needle valve. Secure the wire in
place by tightening the set screw in the side of
the needle valve.
3x10mm
4.
7.
8.
9.
10.
5.
6.