Instruction Manual book
SPECIFICATION
Wingspan : 1,750 mm 68.9 in.
Length : 1,730 mm 68.1in.
Weight : 4.8 kg 10.56 Lbs.
Radio : 06 channels.
Servo : 06 servos.
Engine : 160 cu.in 2 Stroke.
200 cu.in 4 Stroke.
Made in Vietnam.
SUKHOI 31. INSTRUCTION MANUAL.
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual thoroughly before starting assembly of your SUKHOI 31. Use the parts listing below to
identify all parts.
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 & RESPONSIBILITY.
If you are inexperienced with basic R/C flight we strongly recommend you contact your R/C supplier
and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training
procedures designed to help the new pilot on his way to successful R/C flight. They will also be able
to advise on any insurance and safety regulations that may apply.
TOOLS & SUPPLIES NEEDED.
Thick 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.
Thread-lock.
Paper towels.
Some more parts.
HARDWARE PACK
COWLING.
Landing gear.....
SUGGESTION.
T o avoid scratching your new airplane, do not
unwrap the pieces until they are needed for
assembly. Cover your workbench with an old
towel or brown paper, both to protect the aircraft and to protect the table. Keep a couple of
jars or bowls handy to hold the small parts after you open the bag.
PARTS LISTING.
FUSELAGE ASSEMBLY
(1) Fuselage.
WING ASSEMBLY
(1) Right wing half with pre-installed
aileron.
(1) Left wing half with pre-installed
aileron.
Tail section assembly
(1) Vertical stabilizer with pre-
installed rudder.
(1) Horizontal stabilizer with pre-
installed elevator halves.
2
NOTE.
Please trial fit all the parts. Make sure you have
the correct parts and that they fit and are
aligned properly before gluing! This will assure
proper assembly.
made from natural materials, every plane is
unique and minor adjustments may have to
be made. However, you should find the fit superior and assembly simple.
The painted and plastic parts used in this kit
are fuel proof. However , they are not tolerant
of many harsh chemicals including the following: paint thinner , C/A glue accelerator , C/A glue
debonder and acetone. Do not let these chemicals come in contact with the colors on the
covering and the plastic parts.
SU KHOI 31 ARF is hand
SUKHOI 31. INSTRUCTION MANUAL.
Caution: this model is not a toy!
If you are a beginner to this type of powered
model, please ask an experienced model flyer
for help and support. If you attempt to operate
the model without knowing what you are doing
you could easily injure yourself or somebody
else. Please keep your safety and well-being
in mind at all times.
Important: before you start construction
Even if you have already built a large number
of RC models please read right through these
instructions and check all the kit components
against the parts list. We have taken great
trouble to keep construction as simple as
possible, without making any compromises
in the area of safety .
Note regarding the film covering
Minor creases or bubbles may develop in the
film covering due to major fluctuations in
weather conditions (temperature, humidity
etc.); in rare cases you may even find a slight
warp in a component. These minor faults are
in the nature of film-covered built-up wooden
structures, and can easily be corrected using
a heat gun, as commonly used for modelling.
Creases: Blow warm air over the area
and rub down with a soft
cloth.
Wing warp: Hold the panel twisted
gently in the opposite
direction to the warp, and
apply warm air to remove
the creases from the
covering.
SAFETY PRECAUTION.
+ This is not a toy
+ Be sure that no other flyers are using your
radio frequency .
+ Do not smoke near fuel
+ Store fuel in a cool, dry place, away from
children and pets.
+ Wear safety glasses.
+The glow plug clip must be securely attached
to the glow plug.
+ Do not flip the propeller with your fingers.
+ Keep loose clothing and wires away from
the propeller.
+ Do not start the engine if people are near.
Do not stand in line with the side of the propeller.
+ Make engine adjustments from behind the
propeller only. Do not reach around the spinning propeller.
INSTALLING THE AILERON SERVOS.
1. Install the rubber grommets and brass
eyelets onto the aileron servo.
Caution! do not heat the film more than is
absolutely necessary. If the air or the iron is
too hot, the film may melt and holes may be
formed.
This model is highly pre-fabricated and can
be built in a very short time. However, the work
which you have to carry out is important and
must be done carefully. The model will only
be strong and fly well if you complete your
tasks competently - so please work slowly
and accurately.
When self-tapping screws have to be
screwed into wood, apply a little white
glue to prevent them shaking loose: just
squirt white glue into the hole and fit the
screw.
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SUKHOI 31. INSTRUCTION MANUAL.
C/A glue.
Remove the
covering.
Bottom of wing.
3. Using the thread as a guide and using
masking tape, tape the servo lead to the end
of the thread: carefully pull the thread out.
When you have pulled the servo lead out, remove the masking tape and the servo lead
from the thread.
4. Drill 1,5mm pilot holes through the block
of wood for each of the four mounting screws
C/A glue.
provided with the servo. Install servo into aileron servo tray as same as picture below.
C/A glue.
2. Using a modeling knife, remove the cov-
ering at possition show below.
Electric
wire.
Thread.
5. Using the thread as a guide and using
masking tape, tape the servo lead to the end
of the thread: carefully pull the thread out.
When you have pulled the servo lead out, remove the masking tape and the servo lead
from the thread.
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SUKHOI 31. INSTRUCTION MANUAL.
Remove the
covering.
Bottom side.
Repeat the procedure for the other wing
half.
INST ALLING THE AILERON CONTROL HORN.
Remove the
covering.
Top side.
3x50mm.
M3 lock nut.
Nilon control clasp.
Control horn of Aileron
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SUKHOI 31. INSTRUCTION MANUAL.
Install aileron control horn as same
as picture below .
Control horn.
Repeat the procedure for the other wing
half.
INSTALLING THE AILERON
LINKAGES.
Installing the aileron linkages as pictures
below.
M3
M3 lock nut
bottom size
C/A ghue.
Attach the clevis to the outer hole in the control horn.
Repeat the procedure for the other wing
half.
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SUKHOI 31. INSTRUCTION MANUAL.
INSTALLING THE ENGINE MOUNT.
4x30mm
4x30mm
C/A glue.
FUEL TANK.
INSTALLING THE STOPPER ASSEMBLY
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SUKHOI 31. INSTRUCTION MANUAL.
Vent tube
Fuel pick- up tube
Fuel fill tube
1. The stopper has been pre-assembled at
the factory.
2. Using a modeling knife, cut one length of
silicon fuel line (the length of silicon fuel line is
calculated by how the weighted clunk should
rest about 8mm away from the rear of the tank
and move freely inside the tank). Connect one
end of the line to the weighted clunk and the
other end to the nylon pick up tube in the stopper.
3. Carefully bend the second nylon tube up
at a 45 degree angle (using a cigarette lighter).
This tube will be the vent tube to the muffler .
4. Carefully bend the third nylon tube down
at a 45 degree angle (using a cigarette lighter).
This tube will be vent tube to the fueling valve.
7. Using a modeling knife, cut 3 lengths of
fuel line 150mm long. Connect 2 lines to the 2
vent tubes and 1 line to the fuel pickup tube in
the stopper .
8. Feed three lines through the fuel tank
compartment and through the pre-drilled hole
in the firewall. Pull the lines out from behind
the engine, while guiding the fuel tank into
place. Push the fuel tank as far forward as
possible, the front of the tank should just about
touch the back of the firewall.
When the stopper assembly is installed
in the tank, the top of the vent tube should
rest just below the top surface of the tank.
It should not touch the top of the tank.
5. Test fit the stopper assembly into the
tank. It may be necessary to remove some of
the flashing around the tank opening using
a modeling knife. If flashing is present, make
sure none of it falls into the tank.
6. When satisfied with the alignment of the
stopper assembly tighten the 3mm x 20mm
machine 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.
Blow through one of the lines to ensure
the fuel lines have not become kinked inside
the fuel tank compartment. Air should flow
through easily .
9. To secure the fuel tank in place, apply a
bead of silicon sealer to the forward area of
the tank, where it exits the fuselage behind the
engine mounting box and to the rear of the tank
at the forward bulkhead.
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SUKHOI 31. INSTRUCTION MANUAL.
Do not secure the tank into place permanently until after balancing the airplane.
You may need to remove the tank to mount
the battery in the fuel tank compartment.
INSTALLING THE ENGINE-
THROTTLE.
Locate the long piece of wire used for the
throttle pushrod. One end of the wire has been
pre-bend in to a “Z” bend at the factory. This
“Z” bend should be inserted into the throttle
arm of the engine when the engine is fitted onto
the engine mount. Fit the engine to the engine
mount using the screws provided.
Fuel tank.
14.5 cm.
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SUKHOI 31. INSTRUCTION MANUAL.
Pushrod wire.
4 x30mm.
Secure.
Right side.
COWLING.
1. Slide the fiberglass cowl over the en-
gine and line up the back edge of the cowl with
the marks you made on the fuselage.
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Left side.
SUKHOI 31. INSTRUCTION MANUAL.
2. While keeping the back edge of the
cowl flush with the marks, align the front of
the cowl with the crankshaft of the engine. The
front of the cowl should be positioned so the
crankshaft is in nearly the middle of the cowl
opening. Hold the cowl firmly in place using
pieces of masking tape.
Right side.
Trim and cut.
Trim and
3 x 12mm.
Bottom side.
Bottom side.
3. Slide the cowl back over the engine
and secure it in place using four wood screws.
See picture below.
4. Install the muffler and muffler extension
onto the engine and make the cutout in the
cowl for muffler clearance. Connect the fuel
and pressure lines to the carburetor, muffler
and fuel filler valve.
INSTALLING THE SPINNER.
3 x 12mm.
Install the spinner backplate, propeller and
spinner cone. The spinner cone is held in
place using two 3mm x 12mm wood screws.
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SUKHOI 31. INSTRUCTION MANUAL.
Secure.
MAIN GEAR INSTALATION.
PARTS REQUIRED
1. Assemble and mounting the wheel
pants as shown in the following pictures.
Repeat the procedure for the other
wheel pant .
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2. A drop of C/A glue on the wheel collar
screws will help keep them from coming lose
during operation.
Repeat the process for the other wheel.
SUKHOI 31. INSTRUCTION MANUAL.
INST ALLING THE MAIN LANDING GEAR.
1. The blind nuts are already mounted
inside the fuselage.
2. The holes in the landing gear should
be to accept the mounting bolts.
3. Using the hardware provided, mount
the main landing gear to the fuselage.
MOUNTING THE TAIL WHEEL
BRACKET.
Landing gear.
Secure.
3x12mm
1. Set the tail wheel assembly in place
on the plywood plate. The pivot point of the
tail wheel wire should be even with the rudder hinge line and the tail wheel bracket
should be centered on the plywood plate.
2. Using a pen, mark the locations of
the two mounting screws. Remove the tail
wheel bracket and drill 1mm pilot holes at
the locations marked.
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SUKHOI 31. INSTRUCTION MANUAL.
Secure.
ELEVATOR INSTALLATION
SERVO INSTALLATION
1. Install the rubber grommets and brass
collets into the elevator servo. Test fit the
servo into the servo tray .
2. Mount the servo to the tray using the
mounting screws provided with your radio
system.
Remove the covering
elevator servo left side
elevator servo right side
HORIZONT AL ST ABILIZER INST ALLA TION.
Horizontal stabilize installation .
See picture below.
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T op elevator .
SUKHOI 31. INSTRUCTION MANUAL.
1. Using a modeling knife, cut away the
covering from the fuselage for the stabilizer
C/A glue.
and remove it.
C/A glue.
2. Draw a center line onto the horizontal
stabilizer. Then put the horizontal into the fuse
large.
Center line.
Top elivator
C/A glue.
3. Mark the shape of the vertical on the left
and right sides onto the horizontal stabilizer
using a felt-tip pen
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SUKHOI 31. INSTRUCTION MANUAL.
Check to mark sure the wing and stabilizer are paralell. If they are not, lightly sand
the opening in the fuselage for the stabilizer
until the stabilizer is paralell to the wing.
5. When you are sure that everything is
aligned correctly, mix up a generous amount
Bottom side.
4. Remove the stabilizer. Using the lines
you just drew as a guide, carefully remove the
covering from between them using a modeling
knife.
When cutting through the covering to
remove it, cut with only enough pressure
to only cut through the covering it’s self.
Cutting into the balsa structure may
weaken it. This could lead to possible failure during flight
of 30 minute epoxy. Apply a thin layer to the
top and bottom of the stabilizer mounting area
and to the stabilizer mounting platform sides
in the fuselage. Slide the stabilizer in place
and re-align. Double check all of your measurements one more time before the epoxy
cures. Remove any excess epoxy using a
paper towel and rubbing alcohol and hold the
stabilizer in place with T -pins or masking tape.
Bottom side.
Epoxy glue.
Remove covering.
C/A glue.
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C/A glue.
SUKHOI 31. INSTRUCTION MANUAL.
6. After the epoxy has fully cured, removethe
masking tape or T-pins used to hold the
stabilizer in place and carefully inspect the
glue joints. Use more epoxy to fill in any
gaps that were not filled previously and
clean up the excess using a paper towel and
rubbing alcohol.
ELEVATOR CONTROL HORN
PUSHROD INSTALLATION.
Elevator control horn install as same as the
way of aileron control horn. Please see pictures below.
M3 lock nut.
3mm x 40mm.
Nilon control clasp.
Control horn of elevator.
Remover covering.
Bottom side.
Bottom side.
Elevator
control horn.
Elevator
control horn.
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SUKHOI 31. INSTRUCTION MANUAL.
ELEVATOR PUSHDROD
INSTALLATION
Elevator pushrod install as same as the
way of aileron pushrod.
Left side.
VERTICAL INSTALLATION.
Vertical stabilizer installation
See picture below.
Right side.
Elevator
pushrod.
Bottom side.
Elevator
pushrod.
Hinge.
1. Using a modeling knife cut away the
covering from the end of fuselage for the rudder hinge.
C/A glue.
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C/A glue.
Top side.
SUKHOI 31. INSTRUCTION MANUAL.
Also carefully remove the covering from
the horizontal fin as below the lines which
you drew as same picture below.
Remove
covering.
Hinge slot.
2. Put the rudder into the fuselage as same
as picture below.
3. Mark the shape of the vertical on the left
and right side of the rudder using a felt-tip pen.
Mark line
4. Now, remove the rudder and using a
modeling knife, carefully cut just inside the
marked lines and remove the film of the rudder. Just as you did with the horizont al stabilizer, make sure you only press hard enough
to cut the film, not the balsa rudder.
Epoxy glue.
Remove covering.
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SUKHOI 31. INSTRUCTION MANUAL.
RUDDER PUSHROD INSTALLATION.
1. Rudder pushrod install as same as
the way of aileron control horn.
2. Rudder push - pull system install as
same as picture below.
M3 clevis ( 4pcs for push - pull system ).
M3 lock nut.
Rudder push-pull system install as sams
as picture below
C/A glue.
6) When you are sure that everything is a
aligned correctly, mix up a generous amount
of 30 minute epoxy. Apply a thin layer to the
slot in the mounting platform and to the vertical stabilizer mounting area. Apply epoxy to
the lower rudder hinge. Set the stabilizer in
place and re-align. Double check all of your
measurements once more before the epoxy
cures. Remove any excess epoxy using a
paper towel and rubbing alcohol and hold the
stabilizer in place with T -pins or masking tape.
Allow the epoxy to fully cure before proceeding.
RUDDER CONTROL HORN INSTALLA-
TION.
Rudder control horn install as same as the
way of aileron control horn. Please see pictures below.
Remove
covering.
C/A glue.
3mmx60mm.
Nilon control clasp.
M3 lock nut.
Control horn of Rudder.
20
SUKHOI 31. INSTRUCTION MANUAL.
Elevator
pushrod.
Rudder cable.
Cut.
Elevator
pushrod.
Rudder push - pull cable
Rudder cable.
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SUKHOI 31. INSTRUCTION MANUAL.
3. Secure the tail wheel bracket in place
using three 3mm x 12mm wood screws.
Be careful not to overtighten the screws.
Conector.
Rudder cable.
3X12mm
Servo arm.
After inst alling the adjustable metal connector apply a small drop of thin C/A to the bottom nut. This will prevent the connector from
loosening during flight.
secure.
Secure
INST ALLING THE THROTTLE PUSHROD.
Install one adjustable metal connector
through the third hole out from the center of
one servo arm, enlarge the hole in the servo
arm using a 2mm drill bit to accommodate
the servo connector. Remove the excess
material from the arm.
Cut.
Throttle pushrod.
INSTALLING THE SWITCH.
1. Cut out the switch hole using a
modeling knife. Use a 2mm drill bit and drill
out the two mounting holes through the fuselage side.
2. Secure the switch in place using the
two machine screws provided with the radio
system.
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SUKHOI 31. INSTRUCTION MANUAL.
2. Wrap the receiver and battery pack in
the protective foam to protect them from vibration. Use a rubber band or masking tape
to hold the foam in place.
3. Position the battery pack and receiver
behind the fuel tank. Use two tie wraps to
hold the battery and receiver securely in place.
As pictures below.
Do not permanently secure the receiver
and battery until after balancing the model.
4. Using a 2mm drill bit, drill a hole through
the side of the fuselage, near the receiver,
for the antenna to exit.
Tie wrap.
Switch
INST ALLING THE RECEIVER AND BA TTERY.
1. Plug the servo leads and the switch
lead into the receiver. Y ou may want to plug
an aileron extension into the receiver to make
plugging in the aileron servo lead easier
when you are installing the wing . Plug the
battery pack lead into the switch.
Recever
Tie warp for battery
23
SUKHOI 31. INSTRUCTION MANUAL.
Battery
WING A TTACHMENT.
1. Using a modeling knife, remove the cov-
ering fuselage.
2. Locate the aluminium wing dihedral
brace.
)***Test fit the aluminium tube dihedral
brace into each wing haft. The brace should
slide in easily . If not, use 220 grit sand around
the edges and ends of the brace until it fits
properly.
Wing bolt.
Secure the wing and fuse large through wing
bolt as picture below.
Wing bolt.
3. Test fit the dihedral brace into fuse-
lage.
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SUKHOI 31. INSTRUCTION MANUAL.
BALANCING.
1) It is critical that your airplane be bal-
anced correctly . Improper balance will cause
your plane to lose control and crash.
THE CENTER OF GRAVITY IS LOCATED
120MM BACK FROM THE LEADING EDGE
OF THE WING .
2) Mount the wing to the fuselage. Using a
couple of pieces of masking tape, place them
on the top side of the wing 120 mm back from
the leading edge, at the fuselage sides.
3. Turn the airplane upside down. Place
Installing the canopy as same as
picture below
your fingers on the masking tape and carefully lift the plane .
Accurately mark the balance point on the top
of the wing on both sides of the fuselage. The
balance point is located 120mm back from
the leading edge. This is the balance point at
which your model should balance for your first
flights. Later , you may wish to experiment by
shifting the balance up to 10mm forward or
back to change the flying characteristics.
Moving the balance forward may improve the
smoothness and arrow- like tracking, but it
may then require more speed for take off
and make it more difficult to slow down for
landing. Moving the balance aft makes the
model more agile with a lighter and snappier
”feel”. In any case, please start at the location we recommend .
Secure the canopy frame.
With the wing attached to the fuselage, all
parts of the model installed ( ready to fly), and
empty fuel tanks, hold the model at the
marked balance point with the stabilizer level.
Lift the model. If the tail drops when you
lift, the model is “tail heavy” and you must
add weigh* to the nose. If the nose drops, it
is “nose heavy” and you must add weight* to
the tail to balance.
*If possible, first attempt to balance the model
by changing the position of the receiver battery and receiver. If you are unable to obt ain
good balance by doing so, then it will be necessary to add weight to the nose or tail to
achieve the proper balance point.
25
SUKHOI 31. INSTRUCTION MANUAL.
CG
120mm
CONTROL THROWS.
1) We highly recommend setting up a
plane using the control throws listed.
2) The control throws should be meas-
ured at the widest point of each control surface.
3) Check to be sure the control surfaces
move in the correct directions.
Ailerons : 30mm up 30mm down
Elevator : 30mm up 30mm down
Rudder : 35mm right 35mm left
30
30
Ailerons Control
30
30
35
35
PRE-FLIGHT CHECK.
1) Completely charge your transmitter and
receiver batteries before your first day of flying.
2) Check every bolt and every glue joint in
your plane to ensure that everything is tight
and well bonded.
3) Double check the balance of the
airplane.
4) Check the control surface.
5) Check the receiver antenna . It should
be fully extended and not coiled up inside the
fuselage.
6) Properly balance the propeller .
We wish you enjoy.
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SUKHOI 31. INSTRUCTION MANUAL.
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