Black Horce Model SUKHOI31 Owner's manual

SPECIFICATION


Wingspan : 1,400 mm 55 in.


Length : 1,250 mm 49 in.


Weight : 2.6 kg 5.72 Lbs.


Radio : 04 channels.


Servo : 05 servos.


Engine : 46 2 Stroke.
52-70 4 Stroke.
Instruction Manual book
MadeinVietnam.

SUKHOI 31. Instruction Manual
2
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual thoroughly before starting assembly of your SUKHOI SU31. 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.
IfyouareinexperiencedwithbasicR/CflightwestronglyrecommendyoucontactyourR/Csupplier
and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training
proceduresdesignedtohelpthenew pilotonhiswaytosuccessfulR/C flight.Theywillalso beable
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.
Modellingknife.
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.
HARDWAREPACK
COWLING.
Landinggear.....
Toavoid scratching yournew airplane,donot
unwrap the pieces until they are needed for
assembly. Cover your workbench with an old
towel or brown paper, both to protect the air-
craftand toprotect thetable.Keepacoupleof
jars or bowls handy to hold the small parts af-
ter you open the bag.
Pleasetrialfitalltheparts. Makesureyouhave
the correct parts and that they fit and are
alignedproperly beforegluing!Thiswillassure
proper assembly. SUKHOI SU31 ARF is hand
made from natural materials, every plane is
unique and minor adjustments may have to
be made. However, you should find the fit su-
perior 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 follow-
ing:paintthinner,C/Aglueaccelerator,C/Aglue
debonderandacetone. Donotletthesechemi-
cals come in contact with the colors on the
covering and the plastic parts.
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-
installedrudder.
(1) Horizontal stabilizer with pre-
installedelevator halves.
SUGGESTION.
NOTE.

SUKHOI 31. INSTRUCTION MANUAL
3
+ 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.
+Theglowplug clipmustbesecurely attached
to the glow plug.
+ Do not flip the propeller with your fingers.
+ Keep loose clothing and wires away from
thepropeller.
+ Do not start the engine if people are near.
Donot standinlinewiththesideof thepropel-
ler.
+ Make engine adjustments from behind the
propeller only. Do not reach around the spin-
ningpropeller.
SAFETY PRECAUTION.
 1. Install the rubber grommets and brass
eyelets onto the aileron servo.
 2. Usingamodeling knife,remove the cov-
ering servo tray.
INSTALLING THEAILERON SERVOS.
Servo tray.
3.Drill1,5mm pilotholes through theblock
of wood for each of the four mounting screws
provided with the servo. Install servo into ai-
leron servo tray as same as picture below.
4. 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, re-
move the masking tape and the servo lead
from the thread.
Bottom side.

SUKHOI 31. Instruction Manual
4
5. Instal servo tray with aileron servo into
the wing as same as picture below.
Servo tray.
Wing.
Repeat the procedure for the other wing
half.
3x40mm.
Nilon control clasp.
M3locknut.
ControlhornofAileron
INSTALLINGTHEAILERONCONTROLHORN.
Electric wire.
2 x 10 mm.

SUKHOI 31. INSTRUCTION MANUAL
5
AileronControlhorn
 3. Drillthrough 6mm(diameter)the aileron
using the control horn as a guide and screw
the control horn in place.
1. Using a ruler & pen to draw a straight
line as below picture.
2. Locate nylon control horn, nylon con-
trol horn backplates .
4. Install control horn as same as picture
below.
6mm (diameter)

SUKHOI 31. Instruction Manual
6
INSTALLING THE AILERON
LINKAGES.
1. Working with the aileron linkage for
now, thread one clevis onto one of the
threaded wires.
4. Locate one nylon servo arm, and using
wire cutters,remove all but one of the arms.
Using a 2mm drill bit, enlarge the third hole
out from the center of the arm to accommo-
date the aileron pushrod wire.
5.Usingpliers,carefullymake a90 degree
bend down at the mark made. Cut off the ex-
cess wire, leaving about 4mm beyond the
bend.
6.Insertthe 90degree bend down through
the hole in the servo arm. Install one nylon
snap keeper over the wire to secure it to the
arm. Installthe servoarm retainingscrew and
remove the masking tape from the aileron.
C/Aglue.
2. Attach the clevis to the outer hole in the
control horn.
3. Plug the aileron servo into the receiver
andcentertheservo.Installthe servoarmonto
the servo. The servo arm should be perpen-
dicular to the servo and point toward the mid-
dle of the wing.
Repeat the procedure for the other wing
half.
C/Aglue.
Top side.
Bottom side.
M2locknut.
M2clevis. Snapkeeper.

SUKHOI 31. INSTRUCTION MANUAL
7
JOINING THE WING HALVES.
1. Locate the aluminium wing dihedral
brace.
 2.Usinga modelingknife,remove thecov-
ering wing.
 3. Test fit the dihedral brace into each wing
half. The brace should slide in easily.
Remove covering.
Epoxyglue.
Aluminium brace.
Maskingtape.
Apply masking tape.
Maskingtape.

SUKHOI 31. Instruction Manual
8
INSTALLING THE ENGINE MOUNT.
See pictures below:
cut.
INSTALLING THE ENGINE MOUNT.
3x20mm.
4x25mm.

SUKHOI 31. INSTRUCTION MANUAL
9
5. Test fit the stopper assembly into the
tank. It may be necessary to remove some of
the flashing around the tank opening using
amodeling knife. Ifflashing is present, make
sure none of it falls into the tank.
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 frontofthetankshould justabout
touch the back of the firewall.
6. When satisfied with the alignment of the
stopper assembly tighten the 3mm x 20mm
machine screw until the rubber stopper ex-
pandsand sealsthetank opening.Do notover
tighten the assembly as this could cause the
tank to split.
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.
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.
INSTALLING THE STOPPER ASSEMBLY
1.Thestopper hasbeen pre-assembledat
the factory.
2.Using amodeling knife,cut onelength of
siliconfuelline (thelength ofsilicon fuellineis
calculated by how the weighted clunk should
restabout 8mmaway fromtherearofthetank
andmove freelyinside thetank). Connectone
end of the line to the weighted clunk and the
otherend tothenylonpickuptubein thestop-
per.
3.Carefully bendthesecondnylontubeup
ata 45degreeangle (usingacigarettelighter).
This tube will be the vent tube to the muffler.
4.Carefully bendthethirdnylontube down
ata 45degreeangle (usingacigarettelighter).
This tubewill bevent tubeto thefuelingvalve.
FUEL TANK.

SUKHOI 31. Instruction Manual
10
Secure the fuel tank tray on to the fuse-
lage .
Locate the long piece of wire used for the
throttlepushrod. Oneendofthewire hasbeen
pre-bend in to a “Z” bend at the factory. This
“Z” bend should be inserted into the throttle
armofthe enginewhentheengine isfittedonto
theengine mount.Fittheengineto theengine
mount using the screws provided.
INSTALLING THE ENGINE.
Do not secure the tank into place perma-
nently until after balancing the airplane.
You may need to remove the tank to mount
the battery in the fuel tank compartment.
Blow through one of the lines to ensure
the fuel lines have not become kinked inside
the fuel tank compartment. Air should flow
througheasily.
9. To secure the fuel tank in place, apply a
bead of silicon sealer to the forward area of
thetank, whereit exitsthefuselage behindthe
enginemountingbox andtotherearofthetank
at the forward bulkhead.
Fueltank.
3 x 10mm.
Fuel tank tray.

SUKHOI 31. INSTRUCTION MANUAL
11
Pushrod wire.
COWLING.
1. Slide the fiberglass cowl over the en-
gineand lineup thebackedgeofthe cowlwith
the marks you made on the fuselage.
110mm.
Secure.

SUKHOI 31. Instruction Manual
12
Installthe spinnerbackplate,propellerand
spinner cone. The spinner cone is held in
place using two 3mm x 15mm wood screws.
INSTALLING THE SPINNER.
2. While keeping the back edge of the
cowl flush with the marks, align the front of
thecowlwiththecrankshaftoftheengine. 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.
4. Installthemufflerandmufflerextension
onto the engine and make the cutout in the
cowl for muffler clearance. Connect the fuel
and pressure lines to the carburetor, muffler
andfuel fillervalve.
3. Slide the cowl back over the engine
andsecure itin placeusing fourwood screws.
See picture below.
Trimandcut.
Machine screw.

SUKHOI 31. INSTRUCTION MANUAL
13
1. Install the rubber grommets and brass
colletsintotheelevatorservo.Test fittheservo
into the servo tray.
2. Mount the servo to the tray using the
mountingscrews providedwithyourradiosys-
tem.
ELEVATOR INSTALLATION.
Elevator servo.
2. Draw a center line onto the horizontal
stabilizer. Then slide the horizontal into the
fuselage.
Remove covering.
HORIZONTAL STABILIZER.
See pictures below:
1. Using a modeling knife, cut away the
covering from the fuselage for the stabilizer
and remove it.
Center line.

SUKHOI 31. Instruction Manual
14
ELEVATOR CONTROL HORN INSTALLA-
TION.
Elevator control horn install as same as the
way of aileron control horn. Please see pic-
tures below.
5. When you are sure that everything is
aligned correctly, mix up a generous amount
of 30 minute epoxy. Apply a thin layer to the
topand bottomofthestabilizermountingarea
and to the stabilizer mounting platform sides
inthefuselage.Slidethestabilizerinplaceand
re-align. Double check all of your measure-
ments one more time before the epoxy cures.
Remove any excess epoxy using a paper
towel and rubbing alcohol and hold the stabi-
lizer in place with T-pins or masking tape.
6. After the epoxy has fully cured, re-
move
the 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
rubbingalcohol.
3. Markthe shapeoftheverticalontheleft
and right sides onto the horizontal stabilizer
using a felt-tip pen
4. Remove the stabilizer. Using the lines
youjustdrew asa guide,carefully removethe
coveringfrom betweenthem usingamodeling
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 fail-
ure during flight
Pen.
Bottom side.
Remove covering.
Bottom side.
Epoxyglue.
C/Aglue.

SUKHOI 31. INSTRUCTION MANUAL
15
Controlhornofelevator.
Drill 1 hole with 6 mm diameter.
3mm x 40mm.
M3 lock nut.
Nilon
control clasp.
elevator control horn.
Pen.
Bottom side.

SUKHOI 31. Instruction Manual
16
C/Aglue.
C/Aglue.
ELEVATOR PUSHROD INSTALLATION.
Elevatorpushrodinstallassameastheway
of aileron pushrod.
Elevator control horn.
Elevator
pushrod.
C/Aglue.
Top side.
Bottom side.

SUKHOI 31. INSTRUCTION MANUAL
17
Snapkeeper.
VERTICAL INSTALLATION.
C/Aglue.
Cut.
Bend.
Elevator servo.
Bend and cut
after.
Rudder servo.

SUKHOI 31. Instruction Manual
18
2. Slide the rudder into the fuselage as
same as picture below.
Hingeslot.
4. Now, remove the rudder and using a
modeling knife, carefully cut just inside the
marked lines and remove the film of the rud-
der. Just as you did with the horizontal stabi-
lizer, make sure you only press hard enough
to cut the film, not the balsa rudder.
3. Markthe shapeoftheverticalontheleft
and right side on the rudder using a felt-tip
pen.
5. Put the vertical stabilizer back in
place. Using a triangle, check to ensure
that the vertical stabilizer is aligned 90 de-
gree to the horizontal stabilizer.
Remove
covering.
Control clasp.
Hinge.
1) Using a modeling knife, remove the
covering from the top of the fuselage and the
covering from over the precut hinge slot cut
intothelower rearportion ofthe fuselageThis
slot accepts the lower vertical.
Pen.

SUKHOI 31. INSTRUCTION MANUAL
19
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 verti-
cal 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
stabilizerin placewithT-pinsor maskingtape.
Allow the epoxy to fully cure before proceed-
ing.
Epoxyglue.
Epoxyglue.
RUDDER CONTROL HORN INSTALLA-
TION.
Rudder control horn install as same as the
way of aileron control horn. Please see pic-
tures below.
Drill 6mm a hole of the mounting rudder
control horn on to the rudder with 6mm diam-
eter.
ControlhornofRudder.
C/Aglue.
Pen.
Marka hole.
3mm x 40mm.
M3 lock nut.
Nilon
control clasp.

SUKHOI 31. Instruction Manual
20
INSTALLING THE THROTTLE PUSHROD.
1. 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 mate-
rial from the arm.
After installing the adjustable metal con-
nector apply a small drop of thin C/A to
the bottom nut. This will prevent the con-
nector from loosening during flight.
Servo arm.
Connec-
tor.
C/Aglue.
 1. Cutout theswitch holeusingamodeling
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.
INSTALLING THE SWITCH.
Throttle servo.
Rudderpushrod. Elevatorpushrod.