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Instruction Manual.
1
ALMOST READY TO FLY
ASSEMBLY MANUAL
Specications:
Wingspan---------------65.0 in (165 cm).
Wing area----------------1240.0 sq.in (80.0 sq.dm).
Weight--------------------11.0 lbs (5.0 kg).
Fuselage Length--------57.8 in (146.80cm).
Engine-------------------0.9cu.in - 2 stroke.
----------------------------1.2cu.in - 4 stroke.
----------------------------20-22cc gasoline engine
Radio--------------------4 channel with 6 servos.
Code: SEA212
“ Graphics and specications may change without notice ” .
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Bunker Bu 133
2
ank you for choosing the BUNKER BU 133 ARF by SG MODELS . e BUNKER BU 133
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 BUNKER BU 133 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 BUNKER BU 133. Use the parts listing
below to indentify all parts.
INTRODUCTION.
WARNING.
KIT CONTENTS
1
2
3
3
6
7
4
5
2
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 RC ight we strongly recommend you contact your RC
supplier and join your local RC model Flying Club. RC Model Flying Clubs oer a variety of
training procedures designed to help the new pilot on his way to successful RC ight. ey will
also be able to advise on any insurance and safety regulations that may apply.
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Instruction Manual.
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KIT CONTENTS.
SEA21201 Fuselage
SEA21202 Wing set
SEA21203 Tail set
SEA21204 Canopy Hatch
SEA21205 Cowling
SEA21206 Wing tube
SEA21207 Pilot
ADDITIONAL ITEMS REQUIRED.
0.9cu.in - 2 stroke.
1.2cu.in - 4 stroke.
20-22cc gasoline engine.
Radio 4 channel with 6 servos.
Glow plug to suit engine.
Propeller to suit engine.
Protective foam rubber for radio
system.
Silicone fuel line.
TOOLS & SUPPLIES NEEDED.
ick 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.
HINGING THE ELEVATORS.
1) Locate the item for this sectiom of the
manual.
2) Carefully remove the elevator from
one of the horizontal stabilizer panels.
Note the position of the hinges.
3) Remove each hinge from the horizontal stabilizer panel and elevator
and place a T-pin in the center of each
hinge. Slide each hinge into the elevator until the T-pin is snug against the
elevator. is will help ensure an equal
amount of hinge is on either side of the
hinge line when the elevator is mounted to the horizontal stabilizer panel.
Epoxy
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Bunker Bu 133
4
HINGING THE RUDDER.
Glue the rudder hinges in place using
the same techniques used to hinge the ailerons.
Locate the hardware necessary to install
the control horns for the ailerons.
INSTALL THE AILERON
CONTROL HORN.
Ep ox y.
Glue the hinge hinges in place using the
same techniques used to hing the ailerons.
.
Elevator control horn.
Ep ox y.
Install the elevator control horn using
the same method as same as the aileron
control horns.
INSTALL ELEVATOR CONTROL HORN.
.
Elevator control horn.
Ep ox y.
Ep ox y.
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Instruction Manual.
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Ep ox y.
Rudder control horn.
INSTALL RUDDER CONTROL HORN.
Repeat steps to install the rudder control
horn as same as steps done for ailerons.
Rudder control horn.
INSTALLING THE FUSELAGE SERVOS.
.
Because the size of servos dier, 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 onto the fuselage servo. Test t the
servo into the aileron servo mount.
2) Secure the servos with the screws provided with your radio system.
rottle.
Rudder.
Elevator.
Elevator.
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.
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Bunker Bu 133
6
INSTALLING THE SWITCH RECEIVER.
Install the switch into the precut hole in
the side, in the fuselage.
3/32” Hole.
Trim and cut.
.
INSTALLING THE SWITCH ENGINE.
Trim and cut.
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.
A
B
Switch.
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Instruction Manual.
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Vent tube.
Fuel pick up tube.
Fuel fill tube.
3) Carefully bend the second nylon 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.
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.
6) When satised with the alignment of the
stopper assembly tighten the 3 x 20mm machine screw until the rubber stopper expands
and seals the tank opening. Do not overtighten 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
dicult 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) Use plywood template to hold in place the
fuel tank with C/A glue to secure the fuel
tank inside the fuselage.
A
C/A glue.
C/A glue.
Balsa wood.
B
9) Connect the lines from the tank to the engine and muer. e vent line will connect
to the muer and the line from the clunk to
the carburetor.
Vent tube.
Fuel pick up tube.
Fuel ll tube.
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Bunker Bu 133
8
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.
.
ENGINE MOUNT INSTALLATION.
1) Locate the items necessary to install
the engine mount included with your
model.
4x30mm
2) 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 vibrating loose.
read locker glue.
MOUNTING THE ENGINE - 2 stroke.
1) Position the engine with the drive
washer (145mm) forward of the rewall
as shown.
145mm
2) Use a pin drill and 4mm drill bit to
drill a small indentation in the mount for
the engine mounting screw.
3) Use a drill to drill the four holes in the
engine mount rails.
4mm
4mm
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Instruction Manual.
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4) On the re wall has the location for the
throttle pusshrod tube (pre-drill).
5) Slide the pushrod tube in the rewall
and guide it through the fuel tank mount.
Use medium C/A to glue the tube to the
rewall and the fuel tank mount.
6) Connect the Z-bend in the 450mm
throttle pushrod to the outer hole of the
carburetor arm.
7) 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.
Machine screw M4x30mm
Pushrod wire.
8) 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.
9) 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.
COWLING.
Please see these below pictures.
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Bunker Bu 133
10
Cut.
Ep ox y.
Drill hole 3mm.
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Instruction Manual.
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1) Slide the berglass cowl over the engine and line up the back edge of the cowl
with the marks you made on the fuselage
then trim and cut as shown.
Because of the size of the cowl, it may be necessary to use a needle valve extension for the
high speed needle valve. Make this out of sufcient 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.
2) While keeping the back edge of the cowl
ush with the marks, align the front of the
cowl with the cranksha of the engine. e
front of the cowl should be positioned so the
cranksha is in nearly the middle of the cowl
opening. Hold the cowl rmly in place using
pieces of masking tape.
3) Install the muer and muer extension
onto the engine and make the cutout in the
cowl for muer clearance. Connect the fuel
and pressure lines to the carburetor, muer
and fuel ller valve. Secure the cowl to fuselage using the M3x10mm screws.
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Bunker Bu 133
12
INSTALLING THE PROPELLER.
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.
MOUNTING THE ENGINE .
1) Position the engine with the drive
washer (145mm) forward of the rewall
as shown.
145 mm
Machine screw M4x30mm
2) Use a pin drill and 4mm drill bit to
drill a small indentation in the mount for
the engine mounting screw.
3) Use a drill to drill the four holes in the
engine mount rails.
4) On the re wall has the location for the
throttle pusshrod tube (pre-drill).
5) Slide the pushrod tube in the rewall
and guide it through the fuel tank mount.
Use medium C/A to glue the tube to the
rewall and the fuel tank mount.
6) Connect the Z-bend in the 450mm
throttle pushrod to the outer hole of the
carburetor arm.
7) 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.
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Instruction Manual.
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COWLING.
1) Slide the berglass cowl over the engine and line up the back edge of the cowl
with the marks you made on the fuselage
then trim and cut as shown.
Trim and cut.
Because of the size of the cowl, it may be necessary to use a needle valve extension for the
high speed needle valve. Make this out of sufcient 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.
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Bunker Bu 133
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3) Install the muer and muer extension
onto the engine and make the cutout in the
cowl for muer clearance. Connect the fuel
and pressure lines to the carburetor, muer
and fuel ller valve. Secure the cowl to fuselage using the M3x10mm screws.
INSTALLING THE PROPELLER.
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.
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Instruction Manual.
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INSTALLING THE AILERON SERVOS.
Servos
.
Small
weight
.
Thread
.
Because the size of servos dier, 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
locations on the blocks.
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 connection so they cannot become unplugged.
6) Secure the servo to the aileron hatch
using Phillips screwdriver and the screws
provided with the servo.
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Bunker Bu 133
16
7) 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
.
8) A string has been provided in the wing
to pull the aileron lead through to the
wing root. 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) Set the aileron hatch in place and use a
Phillips screw driver to install it with four
wood screws.
2x10mm
AILERON PUSHROD
INSTALLATION.
Please see below pictures.
Page 17
Instruction Manual.
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Fuel tubing.
Hex Nut.
Metal clevis.
INSTALLING THE HORIZONTAL
STABILIZER.
1) Using a ruler and a pen, locate the centerline of the horizontal stabilizer, at the
trailing edge, and place a mark. Use a triangle and extend this mark, from back to
front, across the top of the stabilizer. Also
extend this mark down the back of the
trailing edge of the stabilizer.
2) Using a modeling knife, carefully remove the covering at mounting slot of
horizontal stabilizer ( both side of fuselage).
Draw center line
3) Slide the stabilizer into place in the
precut slot in the rear of the fuselage.
e stabilizer should be pushed rmly
against the front of the slot.
4) With the stabilizer held rmly in place,
use a pen and draw lines onto the stabilizer where it and the fuselage sides meet.
Do this on both the right and le sides
and top and bottom of the stabilizer.
.
5) Remove the stabilizer. Using the lines
you just drew as a guide, carefully remove
the covering from between them using a
modeling knife.
Pen.
Remove covering.
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Bunker Bu 133
18
6) Using a modeling knife, carefully remove the covering that overlaps the stabilizer mounting platform sides in the
fuselage. Remove the covering from both
the top and the bottom of the platform
sides.
7) When you are sure that everything
is aligned correctly, mix up a generous
amount of 30 Minute Epoxy. Apply a thin
layer to the top and bottom of the stabilizer mounting area and to the stabilizer
mounting platform sidesin the fuselage.
Slide the stabilizer in place and realign.
When cutting through the covering to re-
move it, cut with only enough pressure to only
cut through the covering itself. Cutting into
the balsa structure may weaken it.
Double check all of your measurements
once more before the epoxy cures. Hold
the stabilizer in place with T-pins or
masking tape and remove any excess
epoxy using a paper towel and rubbing
alcohol.
8) Aer the epoxy has fully cured, remove
the masking tape or T-pins used to hold
the stabilizer in place. Carefully inspect
the glue joints. Use more epoxy to ll
in any gaps that may exist that were not
lled previously and clean up the excess
using a paper towel and rubbing alcohol.
Epoxy
INSTALLING VERTICAL STABILIZER
.
1) Using a modeling knife, remove the
covering from over the precut hinge slot
cut into the lower rear portion of the fuselage.
Fill Epoxy
Epoxy
Page 19
Instruction Manual.
19
2) While holding the vertical stabilizer
rmly in place, use a pen and draw a
line on each side of the vertical stabilizer
where it meets the top of the fuselage.
When cutting through the covering to re-
move it, cut with only enough pressure to only
cut through the covering itself. Cutting into
the balsa structure may weaken it.
3) Slide the vertical stabilizer back inplace. Using a triangle, check to ensure
that the vertical stabilizer is aligned 90º
to the horizontal stabilizer.
90º
Vertical
Stabilizer.
Horizontal
Stabilizer.
Epoxy
Epoxy
4) When you are sure that everything is
aligned correctly, mix up a generous
amount of Flash 30 Minute Epoxy. Apply a thin layer to the mounting slot
and to bottom of the vertical stabilizer
mounting area. Apply epoxy to the bottom and top edges of the ller block and
to the lower hinge also. Set the stabilizer
in place and realign. Double check all of
your measurements once more before
the epoxy cures. Hold the stabilizer in
place with T-pins or masking tape and
remove any excess epoxy using a paper
towel and rubbing alcohol. Allow the
epoxy to fully cure before proceeding.
ELEVATOR PUSHROD
INSTALLATION.
1) Install the elevator control horn using
the same method as with the aileron control horns.
2) Position the elevator control horn on
the both side of elevator.
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Bunker Bu 133
20
M2 lock nut.
M2 clevis.
8mm
Elevator pushrod.
8mm
Nylon Snap keeper.
RUDDER PUSHROD
INSTALLATION.
M2 lock nut.
M2 clevis.
8mm
Metal clevis.
Hex nut.
Fuel tubing.
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Instruction Manual.
21
MOUNTING THE TAIL WHEEL.
Locate items necessary to imstall tail
gear.
8mm
Rudder pushrod.
Metal clevis.
Hex nut.
Fuel tubing.
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Bunker Bu 133
22
INSTALLING THE MAIN LANDING
GEAR TO FUSELAGE.
Nose wheel steering arm.
Metal clevis.
C/A glue.
Page 23
Instruction Manual.
23
read a mounting screw into each of
the holes to cut threads in the surrounding wood. Apply a small amount of thin
CA to harden the threads make by the
screws. Position the landing gear so it
rakes forward. Use the screws and landing gear straps to secure the landing gear
to the bottom of the fuselage.
3x15mm
Collar.
Collar.
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Bunker Bu 133
24
CABANE STRUT INSTALLATION.
1) Loacte the items for this section of the
manual.
2) Attach the cabane struts to the fuselage
according to the length as shown.
Mark.
3x10mm
3x6mm
Page 25
Instruction Manual.
25
.
INSTALLATION PILOT AND CANOPY.
1) Locate items necessary to install pilot,
seats.
3x10mm
Page 26
Bunker Bu 133
26
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.
2) A scale pilot is included with this ARF.
e Pilot included tting well to 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 canopy
oor as show. Locate the oval shaped on
the canopy oor and remove the covering. Use epoxy to glue this into the base
of the pilot gure and glue the cockpit
panel in place with C/A glue, please see
pictures as shown.
Ep ox y.
4) Position the canopy onto the fuselage.
Trace around the canopy and onto the fuselage using a felt-tipped pen.
3x10mm
3x10mm
4x10mm
Page 27
Instruction Manual.
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INSTALLING THE RECEIVER.
1) Plug the ve servo leads and the switch
lead into the receiver. Plug the battery
pack lead into the switch also.
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.
2) Wrap the receiver and battery pack in
the protective foam rubber to protect
them from vibration.
ATTACHMENT WING- FUSELAGE.
Attach the aluminium tube into fuselage.
Insert two lower wing panels as pictures
below.
Wing tube.
Insert two upper wing panels as pictures
below.
Wing bolt
Page 28
Bunker Bu 133
28
INSTALLATION WING STRUTS.
1) Loacte the items for this section of the
manual.
2) Attach the two wing struts to the top
of lower wing pant using an M3x20mm
nachine screw.
3) Repeat steps to prepare the remaining
wing panel for installation and use pliers
to bend four of the brass tabs at a slight
angle. Make the bend slightly biased toward the larger hole in the tab.
4x10mm
Page 29
Instruction Manual.
29
INSTALLATION CABLE.
1)Prepare one end of the cable by attaching a cable end using a copper crimp.
read a nut, then a clevis, on the cable
end as shown. Prepare only one end of
each cable at this time.
2)Attach the clevis to the brass tab next to
the rear interplane strut on the upperlower wing.Slide a copper crimp on the
cable. Pass the cable through the brass tab
on the upper wing, the back through the
copper crimp.
M3 clevis
Crimp
Metal Cable.
M3x30mm
Page 30
Bunker Bu 133
30
3) Begin placing tension on the wires,
working from the ends that have been
crimped to the ends that have not. ere
should be light tension on all the cables,
but not enough to change the position
of the wing. Once the cables have been
tensioned, begin by securing the crimps
where the cables pass through the tabs
near the fuselage. en secure the crimps
at the cable ends. Once tensioned, use
side cutters to trim the excess cable.
4) Locate the wing transport frams and
rubber bands. Slide the frames between
the top and the bottom wing as shown.
Use a rubber band to hold the frame to
the top and bottom wing.
Wing bolt
Page 31
Instruction Manual.
31
BALANCING.
1) It is critical that your airplane be
balanced correctly. Improper balance will
cause your plane to lose control and
crash. THE CENTER OF GRAVITY IS LOCATED 180MM BACK
FROM THE LEADING EDGE OF
THE WING AT THE WING ROOT.
3) Turn the airplane upside down. Place
your ngers on the masking tape and
carefully li the plane .
Accurately mark the balance point on
the botttom of the wing on both sides of
the fuselage. e balance point is located
180mm back from the leading edge of
the wing at the wing root. is is the balance point at which your model should
balance for your rst ights. Later, you
may wish to experiment by shiing the
balance up to 10mm forward or back to
change the ying characteristics. Moving the balance forward may improve
the smoothness and arrow- like tracking,
but it may then require more speed for
take o and make it more dicult to slow
down for landing. Moving the balance a
makes the model more agile with a lighter and snappier ”feel”. In any case,please
start at the location we recommend .
With the wing attached to the fuselage,
all parts of the model installed ( ready to
y), and empty fuel tanks, hold the model at the marked balance point with the
stabilizer level.
2) Mount the wing to the fuselage. Using
a couple of pieces of masking tape, place
them on the bottom side of the wing
180mm back from the leading edge of
the wing at the wing root.
Li the model. If the tail drops when
you li, the model is “tail heavy” and you
must add weight* to the nose. If the nose
drops, it is “nose heavy” and you must
add weight* to the tail to balance.
*If possible, rst attempt to balance the
model by changing the position of the receiver battery and receiver. If you are unable to obtain good balance by doing so,
then it will be necessary to add weight to
the nose or tail to achieve the
proper balance point.
Page 32
Bunker Bu 133
32
CONTROL THROWS.
Ailerons:
Up : 20 mm
Down : 20 mm
Elevator:
Up : 20 mm
Down : 20 mm
Rudder:
Right : 30 mm
Le : 30 mm
180 mm
Page 33
Instruction Manual.
33
We wish you many safe and enjoyable ights
with your BUNKER BU 133.
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 BUNKER BU 133 to en-
sure 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.
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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