Seagull Models Cessna L-19A Bird Dog User manual

1
ASSEMBLY MANUAL
Code : SEA 378
Specications:
Wingspan--------------- 98 in------------------- 250 cm.
Wing area--------------- 1215.2 sq.in---------- 78.4 sq.dm.
Weight------------------- 15.4 lbs--------------- 7.0 kg.
Length------------------- 65.6 in---------------- 166.7 cm.
Engine------------------- 30-40cc.
Motor-------------------- 160/ 2700watt/ ESC 70A-100A/
Lipo 9s-10s/ Electric propeller 18x8-20x10.
Radio--------------------- 6 channels with 7 servos.

Cessna L-19A Bird Dog
“Old Dog, New Tricks” 35-40cc - 98” wingspan Instruction Manual.
2
ank you for choosing the Cessna L-19A Bird Dog “Old Dog, New Tricks” 35-40cc - 98”
wingspan ARTF by SG MODELS . e Cessna L-19A Bird Dog “Old Dog, New Tricks”
35-40cc - 98” wingspan 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 conven-
tionally built using balsa, plywood to make it stronger than the average 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
Cessna L-19A Bird Dog “Old Dog, New Tricks” 35-40cc - 98” wingspan 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 Cessna L-19A Bird Dog “Old Dog,
New Tricks” 35-40cc - 98” wingspan 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
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2 2
5
4
11 7
33
8
6
9
10
12
13
14
14

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KIT CONTENTS
SEA378 Cessna L-19A Bird Dog “Old
Dog, New Tricks” 35-40cc - 98” wingspan.
1. Fuselage
2. Wing set (3)
3. Tail set (2)
4. Canopy
5. Cowling
6. Wing tube
7. Landing gear
8. Tail wheel
9. Fuel tank
10. Pushrod set
11. Ep Motor box
12. Led light set
13. Windows
14. Rockets (2)
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.
�30-40cc gasoline engine.
�Computer radio 6 channel with 7
servos.
�Glow plug to suit engine.
�Propeller to suit engine.
�Protective foam rubber for radio
system.
LED LIGHT SET
Please see pictures below.
1.
2.
One the green light for right wing tip,
two white light 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er-
ent ashes mode.
10mm
3.

Cessna L-19A Bird Dog
“Old Dog, New Tricks” 35-40cc - 98” wingspan Instruction Manual.
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5.
6.
4.
7.
8.
Epoxy
9.
10.
11.

5
12.
13.
14.
M2x6mm
15.
16.
C/A glue
17.
HINGING THE AILERON
Note : e control surfaces, including the ailer-
ons, 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 us-
ing a high-quality thin C/A glue.
Carefully remove the aileron from one of
the wing panels. Note the position of the
hinges.
1.

Cessna L-19A Bird Dog
“Old Dog, New Tricks” 35-40cc - 98” wingspan Instruction Manual.
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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 wing
panel until the T-pin is snug against the wing
panel. is will help ensure an equal amount
of hinge is on either side of the hinge line
when the aileron is mounted to the aileron.
Slide the wing panel on the aileron until
there is only a slight gap. e 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.
NOTE : e hinge is constructed of a spe-
cial 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.
Deect the aileron and completely satu-
rate each hinge with thin C/A glue. e
ailerons front surface should lightly con-
tact the wing during this procedure. Ide-
ally, when the 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.
Epoxy
2.
3.
T-pin
Turn the wing panel over and deect 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.
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.
Repeat this process with the other wing
panel, securely hinging the aileron in
place.
Aer both ailerons are securely hinged,
rmly grasp the wing panel and aileron to
make sure the hinges are securely glued
and cannot be pulled out. Do this by care-
fully applying medium pressure, trying to
separate the aileron from the wing panel.
Use caution not to crush the wing struc-
ture.
5.
4.
Hinge
Hinge

7
Work the aileron up and down sev-
eral times to “work in” the hinges
and check for proper movement.
Note :
INSTALL THE AILERONS
CONTROL HORN
Fiberglass control horn
3.
2.
1.
4.
6.
7.
5.
Epoxy
Epoxy
Ailerons control horn

Cessna L-19A Bird Dog
“Old Dog, New Tricks” 35-40cc - 98” wingspan Instruction Manual.
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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.
Use dental oss or heatshrunk tube to
secure the connection so they cannot be-
come unplugged.
INSTALLING THE AILERON SERVOS 3.
4.
1.
2.
Apply 2-3 drops of thin C/A to each of
the mounting holes. Allow the C/A to
cure without using accelerator.
Mininum servo spec.
Torque : 110 oz-in (7.9 kg-cm) @ 4.8V;
131 oz-in (9.4 kg-cm) @ 6.0V
Ailerons servo Flap servo
C/A glue
Secure the servo to the aileron hatch us-
ing Phillips screwdriver and the screws
provided with the servo.
Apply 1-2 drops of thin C/A to each of
the mounting tabs. Allow the C/A to cure
without using accelerator.
C/A glue
5.
6.

9
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.
7.
8.
9.
Set the aileron hatch in place and use a
Phillips screw driver to install it with four
wood screws.
3x10mm
10.
2.
3.
1.
95mm
AILERON PUSHROD INSTALLATION

Cessna L-19A Bird Dog
“Old Dog, New Tricks” 35-40cc - 98” wingspan Instruction Manual.
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1.
2.
3.
4.
95mm
Please see below pictures.
INSTALLING THE FLAP PUSHROD
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.
5.
6.
7.
Attach the ap linkage to the control
horn. Slide the clevis retainer over the
forks of the clevis.
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
position.
Attach the clevis to the ap servo arm.

11
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.
3x10mm
9.
Install plastic ribs.
10.
11.
12.
C/A glue
18mm
13.
14.

Cessna L-19A Bird Dog
“Old Dog, New Tricks” 35-40cc - 98” wingspan Instruction Manual.
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ROCKETS INSTALLATION
Please study images below.
Epoxy
7.
6.
5.
8.
3.
2.
1.
4.

13
10.
11.
12.
9.
M3x35mm
13.
14.
15.
16.
M3x35mm

Cessna L-19A Bird Dog
“Old Dog, New Tricks” 35-40cc - 98” wingspan Instruction Manual.
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17.
19.
18.
en, install struts on the wings and
fuselage.
21.
22.
23.
20.24.
M4x20mm
M4x12mm

15
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 servos
into the fuselage servo mounts.
25.1.
2.
3.
1.
INSTALLING THE RECEIVER SWITCH
Install the switch into the precut hole
in the side, in the fuselage.
3/32” Hole
.
Switch
Trim and cut
.
2) Secure the servos with the screws pro-
vided with your radio system.
Elevator servo arm
Rudder servo arm
1.
INSTALLING THE ENGINE SWITCH
Trim and cut

Cessna L-19A Bird Dog
“Old Dog, New Tricks” 35-40cc - 98” wingspan Instruction Manual.
16
LANDING GEAR INSTALLATION
Locate items needed for landing gear
installation.
2.
1.
Switch
4.
3.
2.
5.
M3x4mm
6.

17
7.
8.
10.
9.
11.
M4x20mm
12.
13.
M4x20mm
14.

Cessna L-19A Bird Dog
“Old Dog, New Tricks” 35-40cc - 98” wingspan Instruction Manual.
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15.
M6x45mm
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 silicone 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.
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.
1.
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
1.
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.

19
3.
6.
5.
4.
7.
MOUNTING THE ENGINE
1.
8.
Please see below pictures.
M5x100mm
2.

Cessna L-19A Bird Dog
“Old Dog, New Tricks” 35-40cc - 98” wingspan Instruction Manual.
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3.
175mm
4.
5.
Ignition Modude
6.
Pushrod wire
7.
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.
8.
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
1.
Please see Images below: