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ASSEMBLY MANUAL
Specications:
Wingspan---------------82.0 in (208.2 cm).
Wing area---------------1349.4 sq.in ( 87.1 sq.dm).
Weight-------------------16.3 -16.8 lbs (7.4- 7.6kg).
Length-------------------77.7 in (197.3 cm).
Engine-------------------50cc-55cc gasoline.
Radio--------------------6 channels with 6 servos.
“ Graphics and specications may change without notice ” .
Code: SEA274
EXTRA 330LX
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EXTRA 330LX
Instruction Manual.
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ank you for choosing the EXTRA 330LX ARF by SG MODELS . e EXTRA 330LX
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,
plywood 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 EXTRA 330LX 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 EXTRA 330LX . Use the parts listing
below to indentify all parts.
ADDITIONAL ITEMS REQUIRED. TOOLS & SUPPLIES NEEDED.
INTRODUCTION.
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 & 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 oer 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.
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.
� 50cc-55cc gasoline engine.
� Computer radio with 6 servos.
� Glow plug to suit engine.
� Propeller to suit engine.
� Protective foam rubber for radio
system.
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EXTRA 330LX
Instruction Manual.
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INSTALL THE AILERONS
CONTROL HORN.
Ep oxy.
Ep oxy.
Aileron control horn.
INSTALLING THE AILERON SERVOS.
1) e ailerons have been pre-hinged
and glued to the wing panels and are
ready for ight. No other steps are necessary for hinging.
2) Layout the servo on the wing to test t
the installation and ensure servo lead is
the correct length.
3) Attach the extension to the servo lead
and secure with Safety Clip, safety wire,
tape or other method. Ensure the plugs
will not come apart from vibration or
light tension.
4) Fasten the pull string from the servo
hole to the male plug of the servo extension.
Fiberglass control horn
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5) Install servo in servo well with the output arm toward the leading edge of the
wing. Mark and drill location of servo
mounting holes.
6) Install servo with servo mounting
screws.
in CA.
38mm
INSTALLING THE AILERON
PUSHROD.
M3x15 Socket Head Cap Screw.
Flat washer.
Lock nut.
M3x15 Socket Head Cap Screw.
Lock nut.
Flat washer.
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EXTRA 330LX
Instruction Manual.
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ELEVATOR SERVO INSTALLATION.
1) e elevators have been pre-hinged
and glued to the stabs and are ready for
ight. No other steps are necessary for
hinging.
INSTALL ELEVATOR CONTROL HORN.
Elevator berglass control horn.
Ep oxy.
Ep oxy.
Fiberglass control horn
2) Attach the extension to the servo lead
and secure with Safety Clip, safety wire,
tape or other method. Ensure the plugs
will not come apart from vibration or
light tension.
Repeat all the above steps for the other
wing.
100mm
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3) Feed servo extension through the elevator servo mounting hole.
4) Mark and drill location of servo
mounting holes.
in CA.
38mm
5) Install servo with servo mounting
screws.
ELEVATOR PUSHROD INSTALLATION.
M3x15 Socket Head Cap Screw.
Flat washer.
Lock nut.
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Instruction Manual.
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.
.
INSTALL RUDDER CONTROL HORN.
Repeat all the above steps for the other
elevator.
M3x15 Socket Head Cap Screw.
Lock nut.
Flat washer.
Fiberglass control horn
38mm
Ep oxy.
Use scotch tape to avoid
pushrod drop out.
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1) Gather one rudder aervo, mounting
screws, servo arm and the rudder control
linkage parts shown below.
INSTALL RUDDER CABLE AND SERVO.
38mm
2) Tape the rudder balance tab to the top
leading edge of the vertical n in the neutral position as shown. is ensures the
rudder is straight when the cables are attached.
3) read the rudder cable through a
brass swage tube, then the threaded coupler, and back through the brass swage
tube on both sides. Pull light tension on
the cable through the coupler on both
sides as shown.
M3x15 Socket Head Cap Screw.
Lock nut.
Flat washer.
5) Crimp the brass tube with a crimping
tool or pliers.
4) Loop the cable back through the brass
swage tube and tighten the second loop
through the brass swage tube as shown.
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Instruction Manual.
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11) Loop the cable back through the brass
swage tube and pull tight.
10) read cable through the threaded
coupler hole, and back through the brass
swage tube as shown.
6) Cut o excess cable as shown.
7) Mark and use a 1/16 bit to drill the
rudder servo.
9) read cable through brass swage tube.
8) Feed one rudder cable through the pre
installed cable exit tube in the rear of the
fuse toward the front of the fuse. Repeat
for other side.
in CA.
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12) Crimp the brass swage tube with a
crimping tool or pliers.
14) Attach ball links to the rudder servo
arm and then attach the servo arm to the
rudder servo as shown.
NOTE : Cable is installed crossed “ X”, not
parallel.
13) Cut o excess cable as shown.
15) Attach the aluminum tube to combine two elevator as below pictures.
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Instruction Manual.
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TAILWHEEL INSTALLATION.
Locate items necessary to install tailwheel.
Place a drop of Blue Loctite on tail wheel
strut mounting screws.
M4x15 Socket Head Cap Screw.
Washer.
Fuel Tubing.
M3x15mm
Blue Loctite.
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Attach the steering spring to the rudder
control horn.
Use pliers to twist spring end closed
around rudder control horn.
Do same for attachment the steering
spring to the rudder tiller.
Repeat spring installation for other side.
INSTALLING THE MAIN LANDING
GEAR TO FUSELAGE.
1) e blind nuts for securing the landing gear are already mounted inside the
fuselage.
2) Using the hardware provided, mount
the main landing gear to the fuselage.
3) Place the fuselage inverted on the
workbench in a suitable stand. Set the
landing gear in place and use a screwdrive to secure the landing gear to the fuselage using bolts M4x25mm and washers. Make sure to use the threadlock on
the bolts so they don’t vibrate loose.
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M4x25mm
Washer.
Use lock nut to secure landing gear
tighen into fuselage.
Install gear cover into landing gear.
3x10mm
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Using locknut install axle to gear.
Align the wheel pant slot over the axle
bolt as shown. Slide the wheel pant slot
over the at sides of the axle bolt and align
blind nuts in wheel pants with mounting
holes in landing gear. When all bolt holes
are aligned tighten axle in place.
in CA.
3x10mm
M3x4mm
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Install the wheel and outer wheel collar.
Use blue Loctite on the wheel collar set
screw before nal tightening
Use blue Loctite on the bolts before nal
tightening.
M3x4mm
M3x10mm
Washer.
Align mounting template to front of
rewall.
Locate the laser cut engine mounting
template.
MOUNTING THE ENGINE.
NOTE : It’s the canister mount which is
used to assemble the canister exhaust system. It’s only for extra reference purpose
for your model.
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Use a 1/4 bit to drill the engine mounting holes
Remove mounting template from rewall. Firewall shown with mounting holes
drilled ready for engine mounting.
Using mounting bolts and washers
mount engine to rewall.
Tighten mounting bolts and secure engine to rewall.
1) Use a 1/4” bit to drill a pushrod exit
hole in the rewall in line with the engine carburetor throttle arm.
2) Assemble ball link to threaded end of
pushrod.
THROTTLE SERVO INSTALLATION.
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3) Attach throttle pushrod to the carburetor throttle arm with the ball link.
4) Install adjustable servo connector in
the servo arm as same as picture below:
5) Install throttle servo into servo mounting tray.
Servo arm.
Adjustable servo
connector.
Loctite secure.
in CA.
6) 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.
Ep oxy.
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1) Position the ignition module on the
side of the engine mounting box and
mark the location of the nylon tie holes
as shown.
2) Use a 1/8” bit to drill the ignition module mounting holes.
7) Move the throttle stick to the closed position 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.
IGNITION INSTALLATION.
3) read nylon tie through mounting
holes.
4) Connect ignition module to pickup
line of engine. Secure with Safety Clip,
safety wire, tape or other method. Ensure
the plugs will not come apart from vibration or light tension.
5) Secure ignition wire with nylon ties as
necessary.
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Trim and cut.
INSTALLING THE RECEIVER SWITCH.
Install the switch into the precut hole in
the side, in the fuselage.
3/32” Hole.
.
Switch.
Switch.
INSTALLING THE ENGINE SWITCH.
Trim and cut.
FUEL TANK ASSEMBLY.
Please see below pictures.
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1) Install the fuel tubing and clunk. Secure the fuel tubing with nylon ties to the
pick-up tube and clunk.
2) Insert the rubber stopper assembly
into the tank with the vent tube at the top
of the tank.
Slide the fuel tank into the fuselage. Use
the T-ting from the fuel dot to connect
lines from the clunk to the carburetor.
Secure all connections using tie wraps.
3) Secure the rubber stopper with set
screw. Take care not to strip threads by
over tightening set screw.
FUEL TANK INSTALLATION.
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BATTERY & RECEIVER.
MUFFLER INSTALLATION.
Install battery using nylon ties and receiver as shown.
Receiver.
Battery.
COWLING.
1) Gather the materials as shown below.
2) Measure and mark the center of the
template material as shown.
Note: You will use this center mark during a later step when aligning template
with cowl.
3) Measure and mark the center of the
bottom of the fuselage as shown. Mount
cowling to fuse and transfer center line
on fuse to bottom of cowl.
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4) Aligning center lines of template and
fuse. Tape the template to the bottom of
the fuse with the back edge of the template ush against the a edge of the recessed cowl mounting ring.
5) Using a hobby knife roughly cut a hole
for the muer exhaust stacks to pass
through.
Note: is will allow you to pull the template up next the engine cylinder head.
6) Trace around the head of the engine
being careful to keep the template in the
same location.
7) Use a hobby knife to cut out the hot air
exit opening as shown.
8) Check the t of the template at this
time. It may be necessary to make small
adjustments to the cutout to get it to t
prop e rly.
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Instruction Manual.
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11) Remove the template and use a rotary
cutting tool and sanding drum to cut out
the openings in the cowl.
10) e cowl should be marked as shown.
Be sure to mark all of the lines clearly and
carefully to aid in cutting.
Note: Take care not to cut or scratch the
cowl.
9) Fit template ush with rear of cowl and
align center marks of template and cowl.
Tape template to the bottom of cowl. Use
a felt tip marker to transfer the template
cutout pattern to the cowl and mark cut
location.
13) Mark and tape the cowl to the fuselage using low-tack tape.
12) Install the cowl and check that everything ts correctly and does not come in
contact with the cowl. If needed enlarge
the cutouts and test t again until everything ts correctly.
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14) Mark by using a drill to drill the holes
for the cowl mounting screws. en, take
cowling out of and drill on it. Make sure
the cowl position is correct before drilling each hole.
M3x15mm
Washers.
Fuel tubing.
ELECTRIC POWER CONVERSION.
1) Locate the items neccessary to install
the electric power conversion included
with your model.
2) Recommend the items necessary to install the electric power conversion parts
included with your model.
- Motor 360 - 6000 Watt
- Propeller: 24x10 ~ 25x12
- ESC: 160A- 200A
- 12S Lipo
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Instruction Manual.
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3) Attach the electric motor box to the
rewall suitable with the cross lines
drawn on the electric motor box and rewall. Using epoxy and balsa stick to secure the motor box to the rewall. Please
see pictures below.
M5x30mm
4) Attach the motor to the front of the
electric motor box using four 4mm blind
nut, four M5x20mm hex head bolts to secure the motor. Please see picture shown.
5mm
Blind nut.
M5x20mm
6.5mm
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170 mm
Epoxy
Balsa stick.
Epoxy
5) Attach the speed control to the side
of the motor box using two-sided tape
and tie wraps. Connect the appropriate
leads from the speed control to the motor. Make sure the leads will not interfere
with the operation of the motor.
Speed control.
Open the air exit hole as shown.
Battery.
INSTALLING THE SPINNER.
Install the spinner backplate, propeller
and spinner cone.
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Instruction Manual.
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.
e 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 propeller comes in contact with it.
ATTACHMENT WING- FUSELAGE.
Attach the aluminum tube into fuselage.
Insert two wing panels as pictures below.
Wing tube.
Wing bolt
M4x15mm
Washers.
Fuel tubing.
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.
INSTALLATION PILOT , PANEL AND
WINDSHIELD.
1) Locate items necessary to install pilot ,
the panel and windshield.
2) A scale pilot is included with this ARF.
e Pilot included ts well in the cockpit.
(or you can order others scale pilot gures made by SG Models. ey are available at SG Models distributors.).
If you are going to install a pilot gure,
please use a sanding bar to sand the base
of the gure so that it is at.
3) Position the pilot gure on the cockpit oor as shown. Use epoxy to glue the
base of the pilot gure, please see pictures
as shown.
Ep oxy.
100mm
2x8mm
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Instruction Manual.
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2) If all the decals are not precut, please
use scissors or a sharp hobby knife to cut
the decals from the sheet. Please be certain the model is clean and free from oily
ngerprints and dust. Position decal on
the model where desired, using the photos on the box and aid in their location.
1) If all the decals are precut and ready to
stick. Please be certain the model is clean
and free from oily ngerprints and dust.
Position decal on the model where desired, using the photos on the box and
aid in their location.
APPLY THE DECALS.
BALANCING.
An important part of preparing the aircra for ght is properly balancing the
model.
1. Attach the wing panels to the fuselage.
Make sure to connect the leads from the
aileron to the appropriate leads from the
receiver. Make sure the leads are not exposed outside the fuselage before tightening the wing bolts. Your model should
be ght-ready before balancing.
2. e recommended Center of Gravity (CG) location for your model is 90–
120mm back from the leading edge at the
wing as shown. Mark the location of the
CG on the top of the wing at the wing tip.
3. When balancing your model, make
sure it is assembled and ready for ght.
Using an assistant, li the model at the
locations marked in the previous step.
is is the correct balance point for your
model.
90-120mm
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Aileron (high rate): Aileron (normal rate):
55% exponential 40% exponential
Up: 42.0 Degrees Up: 25.5 Degrees
Down: 41.0 Degrees Down: 25.0 Degrees
Elevator (high rate): Elevator (normal rate):
70% exponential 40% exponential
Up: 51.0 Degrees Up: 12.5 Degrees
Down: 51.0 Degrees Down 12.5 Degrees
Rudder (high rate): Rudder (normal rate):
45% exponential 40% exponential
Right: 47.0 Degrees Right: 24.0 Degrees
Le: 47.0 Degrees Le: 24.0 Degrees
CONTROL THROWS.
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Instruction Manual.
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FLIGHT PREPARATION. PREFLIGHT CHECK.
Check the operation and direction
of the elevator, rudder, ailerons and
throttle.
A) Plug in your radio system per the
manufacturer’s instructions and turn
everything on.
B) Check the elevator rst. Pull
back on the elevator stick. e elevator halves should move up. If it they do
not, ip the servo reversing switch on
your transmitter to change the direction.
C) Check the rudder. Looking from
behind the airplane, move the rudder
stick to the right. e rudder should
move to the right. If it does not, ip
the servo reversing switch on your
transmitter to change the direction.
D) Check the throttle. Moving the
throttle stick forward should open the
carburetor barrel. If it does not, ip the
servo reversing switch on your transmitter to change the direction.
E) From behind the airplane, look
at the aileron on the right wing half.
Move the aileron stick to the right.
e right aileron should move up and
the other aileron should move down.
If it does not, ip the servo reversing
switch on your transmitter to change
the direction.
1) Completely charge your transmitter and receiver batteries before
your rst day of ying.
2) Check every bolt and every
glue joint in the EXTRA 330LX to ensure that everything is tight and well
bonded.
3) Double check the balance of the
airplane. Do this with the fuel tank
empty.
4) Check the control surfaces. All
should move in the correct direction
and not bind in any way.
5) If your radio transmitter is
equipped with dual rate switches
double check that they are on the low
rate setting for your rst few ights.
6) Check to ensure the control surfaces are moving the proper amount
for both low and high rate settings.
7) Check the receiver antenna.
It should be fully extended and not
coiled up inside the fuselage.
We wish you many safe and enjoyable ights
with your EXTRA 330LX.
8) Properly balance the propeller.
An out of balance propeller will cause
excessive vibration which could lead
to engine and/or airframe failure.
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