Black Horce Model Explosion BH40 Owner's manual

SPECIFICATION


Wingspan : 1,400 mm 55.12 in.


Length : 1,360 mm 53.54 in.


Weight : 1.5 kg 3.3 Lbs.


Radio : 04 channels.


Servo : 04 - 05 servos.


Glow Engine: 25 -32 2 Stroke.


Motor : AXI 2826/10
Instruction Manual book
MadeinVietnam.
ITEM CODE: BH40.

EXPLOSION 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 EXPLOSION . 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
supplierandjoinyourlocalR/CModelFlyingClub.R/CModelFlyingClubsofferavarietyoftraining
proceduresdesignedto helpthenewpilot onhiswaytosuccessfulR/Cflight.Theywillalsobeable
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.
HARDWARE PACK
COWLING.
Landinggear.....
To 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
aircraftand toprotect thetable. Keepa couple
of jars or bowls handy to hold the small parts
after you open the bag.
Please trial fit all the parts. Make sure you
havethe correctpartsandthatthey fitand are
alignedproperly beforegluing!This willassure
proper assembly. EXPLOSION 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
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.
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-
installedelevatorhalves.
SUGGESTION.
NOTE.

EXPLOSION 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.
+Theglowplugclipmust besecurely 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.
Do not stand in line with the side of the
propeller.
+ Make engine adjustments from behind the
propeller only. Do not reach around the
spinningpropeller.
SAFETY PRECAUTION.
INSTALLING THEAILERON SERVOS.
1) Install the rubber grommets and brass
eyelets onto the aileron servo.
2) Install the metal connector onto servo
arm .
I.AILERON
Temporary pin to
keep hinge centered.
Assemble then apply drops of thin
C/A to center of hinge,on both sides.
Cutthecovering
awayfromtheslot.
3) Turn the wing panel right side up. Using
amodelingknife,remove thecoveringat servo
tray.
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,
remove the masking tape and the servo lead
from the thread.
Removecovering.

EXPLOSION Instruction Manual.
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2)Insert aileroncontrol horntotheaileron.
Repeat the procedure for the other
wing half.
1) Using a ruler & pen to draw a straight
line as below picture.
Straigh line.
Markpoint
C/Aglue
 5) Drill 1,6mm pilot holes through the
block of wood for each of the four mounting
screws provided with the servo.
Electric wire.
C/Aglue
2 X 12mm.
INSTALLINGTHEAILERON CONTROLHORN.
Aileronpushrod.
Aileroncontrolhorn.

EXPLOSION INSTRUCTION MANUAL.
5
Repeat the procedure for the other
wing half.
THERE ARE TWO OPTIONS:
1. ELECTRIC MOTOR
2. ENGINE MOUNT.
1. OPTION 1: ELECTRIC MOTOR
INSTALLING ELECTRIC MOTOR.
Cut.
Push.
Push.
3x25mm.
C/Aglue.

EXPLOSION Instruction Manual.
6


3) Donot permanentlysecure thereceiver
and battery until after balancing the model.


4) Usinga 2mmdrill bit, drilla holethrough
the side of the fuselage, near the receiver, for
the antenna to exit.


1) Plug the servo leads and the switch
leadinto the receiver. You may want to plug
anaileronextensioninto 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.


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.
INSTALLINGTHE RECEIVERANDBATTERY.
Battery tray.
Rubber band.
Motor.
Rotor shaft.
Front view.
COWLING.
1) Slide the cowl over the motor and line
up the back edge of the cowl with the marks
you made on the fuselage.
Battery.
Speed control.
3 x10mm

EXPLOSION INSTRUCTION MANUAL.
7
3) Slide the cowl back over the motor.
2) While keeping the back edge of the
cowl flush with the marks, align the front of
thecowlwith thecrankshaft ofthe motor. 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.
2. OPTION 2: ENGINE MOUNT.
INSTALLING THE ENGINE MOUNT.
INSTALLING THE STOPPER ASSEMBLY
1.Thestopper hasbeen pre-assembledat
the factory.
2.Using amodeling knife,cut onelength of
siliconfuel line (thelength ofsilicon fuelline is
calculated by how the weighted clunk should
restabout 8mmaway fromthe rearof thetank
andmove freelyinside thetank). Connectone
end of the line to the weighted clunk and the
other end to the nylon pick up tube in the
stopper.
3.Carefully bendthe secondnylon tubeup
ata 45degreeangle (usingacigarette lighter).
This tube will be the vent tube to the muffler.
4.Carefully bendthe thirdnylon tubedown
ata 45degreeangle (usingacigarette lighter).
This tubewill bevent tubetothefuelingvalve.
FUEL TANK.
Machine screw.
3 x 20 mm.

EXPLOSION Instruction Manual.
8
Fueltank.
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
amodeling knife. Ifflashing is present, make
sure none of it falls into the tank.
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, whereitexitsthefuselage behindthe
enginemountingbox andto therearofthe tank
at the forward bulkhead.
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.
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 frontofthe tankshould 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
expands and seals the tank opening. Do not
over 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.
C/Aglue.

EXPLOSION INSTRUCTION MANUAL.
9
Locate the long piece of wire used for the
throttlepushrod. Oneendofthe wirehas been
pre-bend in to a “Z” bend at the factory. This
“Z” bend should be inserted into the throttle
armoftheenginewhen theengine isfitted onto
theengine mount.Fit theengine totheengine
mount using the screws provided.
INSTALLING THE ENGINE. Pushrod wire.
COWLING.
1) Slide the cowl over the motor and line
up the back edge of the cowl with the marks
you made on the fuselage.
Trim and cut.
Trim and cut.

EXPLOSION Instruction Manual.
10
2) While keeping the back edge of the
cowl flush with the marks, align the front of
thecowlwith thecrankshaftof the motor. 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.
Machine screw.
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. Installthe spinnerbackplate,propeller and
spinner cone. The spinner cone is held in
place using two 3mm x 12mm wood screws.
INSTALLING THE SPINNER.
SERVO INSTALLATION.
ELEVATOR INSTALLATION.
2. Mount the servo to the tray using the
mountingscrews providedwithyour radiosys-
tem.
1. Install the rubber grommets and brass
colletsinto theelevatorservo.Testfittheservo
into the servo tray.

EXPLOSION INSTRUCTION MANUAL.
11
 1) Using a modeling knife, remove the
coveringatservotray(onlyleftsideoffuselage)
and at fuselage slot.
Remove covering.
INSTALLING ELEVATOR.
2) 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.
3) Drill1,6mm pilotholesthroughtheblock
of wood for each of the four mounting screws
provided with the servo.
Remove covering.
Elevator servo.
HORIZONTAL STABILIZER
INSTALLATION.
Bottom side.
Center line.
1) Using a ruler and a pen, locate the
centerline of the elevator, at the trailing edge
and place a mark. Use a triangle and extend
this mark, from back to front, across the top
ofthe elevator.Alsoextend thismarkdownthe
back of the trailing edge of the elevator. Then
slide the elevator into the fuselage.
2. Markthe shapeof thevertical onthe left
and right sides onto the horizontal stabilizer
using a felt-tip pen
Cutthecovering
awayfromtheslot.
Temporary pin to
keep hinge centered.
Assemble then apply drops of thin
C/A to center of hinge,on both sides.

EXPLOSION Instruction Manual.
12
C/Aglue.
4. 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 bottomof thestabilizer mountingarea
and to the stabilizer mounting platform sides
inthefuselage.Slide thestabilizerin placeand
re-align. Double check all of your
measurements one more time before the
epoxycures. Removeanyexcess epoxyusing
a paper towel and rubbing alcohol and hold
the stabilizer in place with T-pins or masking
tape.
5. After the epoxy has fully cured,
removethe masking tape or T-pins used
to hold thestabilizer in place and carefully
inspect theglue 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.
Control horns install as same as method of
aileron wing. See pictures below:
Markpoint
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
3. Remove the stabilizer. Using the lines
youjust drewasa guide,carefully removethe
coveringfrom betweenthemusingamodeling
knife.
Bottom side
C/Aglue
C/Aglue
Remove
covering.
Top side
Epoxyglue.
C/Aglue.
ELEVATOR CONTROL HORN INSTALLA-
TION.
2 X 12mm.

EXPLOSION INSTRUCTION MANUAL.
13
Elevator control horn.
ELEVATOR PUSHROD INSTALLATION.
Pushrod install as same as method of
pushrod wing. See pictures below:
Pushrod.
Rudder servo install as same as method of
elevator servo. See picture below:
Rudder servo.
VERTICAL INSTALLATION
Temporary pin to
keep hinge centered.
Assemble then apply drops of thin
C/A to center of hinge,on both sides.
Cutthecovering
awayfromtheslot.
Hinge.
Hinge.

EXPLOSION Instruction Manual.
14
and re-align. Double check all of your meas-
urements once more 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. Al-
low the epoxy to fully cure before proceeding.
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
slotin themountingplatform andtothe vertical
stabilizer mounting area. Apply epoxy to the
lower rudder hinge. Set the stabilizer in place
3. Markthe shapeof thevertical onthe left
and right side on the rudder using a felt-tip
pen.
Markpoint
4. Now, remove the rudder and using a
modeling knife, carefully cut just inside the
markedlinesand removethefilmof therudder.
Just as you did with the horizontal stabilizer,
make sure you only press hard enough to cut
the film, not the balsa rudder.
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.
Epoxyglue.
90º
Vertical
Stabilizer.
Horizontal
Stabilizer.
Remove covering.
1) Using a modeling knife, remove the
covering from the top of the fuselage and the
covering from over the precut hinge slot cut
intothe lowerrearportion ofthe fuselageThis
slot accepts the lower vertical.
Hingeslot.
2. Slide the rudder into the fuselage as
same as picture below.

EXPLOSION INSTRUCTION MANUAL.
15


1) Using a modeling knife, remove the
coveringfromoverthetwomaingearmounting
slots located in the bottom of the fuselage.


2) Using the two landing gear straps as a
guide,mark thelocations ofthefour mounting
screws onto the fuselage surface.


3) The landing gear wire is held in place
using two nylon landing gear straps and four
wood screws.
Rudder control horn install as same as
method of aileron control horn. Please see
picture below.
 Rudder pushrod install as same as method
of aileron pushrod.
Rudder pushrod.
Elevator servo.
Rudder servo.
C/Aglue.
RUDDER CONTROL HORN INSTALLA-
TION.
RUDDER PUSHROD INSTALLATION.
MAIN GEAR INSTALLATION.
3 x 12mm.
Rudder
control horn.

EXPLOSION Instruction Manual.
16
INSTALLING THE THROTTLE SERVO.


1) Cutout theswitchholeusingamodeling
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.
Throttle servo.
Switch.
INSTALLING THE SWITCH.
INSTALLINGTHE RECEIVERANDBATTERY.


1. Plug the servo leads and the switch
leadinto the receiver. You may want to plug
anaileronextensioninto 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.


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 a light plywood
pieces, placed over the fuel tank and glue to
the fuselage sides to hold the fuel tank. Use a
tie wrap to hold the battery and receiver
securely in place as pictures below.
Do notpermanentlysecure thereceiver and
battery until after balancing the model.


4. Using a2mm drillbit, drilla holethrough
the side of the fuselage, near the receiver, for
the antenna to exit.
Tie wrap.
Tie wrap.
Receiver.

EXPLOSION INSTRUCTION MANUAL.
17
ATTACHMENT WING-FUSELAGE.
See pictures below:
Dihedral
brace.
Installing the canopy hatch as same as
picture below.
Re-
ceiver.
Battery.
Remove covering.
Secure the wing

EXPLOSION Instruction Manual.
18



1)Itis criticalthatyour airplanebe balanced
correctly. Improper balance will cause your
plane to lose control and crash.
THE CENTER OF GRAVITY IS LOCATED
95mm BACK FROM THE LEADING EDGE
OF THE WING.
BALANCING.


1) We highly recommend setting up a
plane using the control throws listed.


2) The control throws should be measured
at the widest point of each control surface.


3) Check to be sure the control surfaces
move in the correct directions.
CONTROL THROWS.
Ailerons : 20mm up 20mm down.
Elevator : 20mm up 20mm down.
Rudder : 30mm right 30mm left.


1) Completely charge your transmitter and
receiverbatteries beforeyourfirstday offlying.


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.
PRE-FLIGHT CHECK.
CG
95MM.


3. Turn the airplane upside down. Place
yourfingers onthe maskingtape andcarefully
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 95mm back from the
leadingedge.Thisisthebalancepointatwhich
yourmodel shouldbalancefor yourfirstflights.
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
smoothnessandarrow- liketracking, butit may
thenrequiremorespeed fortakeoff and make
it more difficult to slow down for landing.
Movingthe balanceaftmakesthemodel 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 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,themodel is“tailheavy” andyou must add
weigh*tothe nose.Ifthenosedrops, itis“nose
heavy” and you must add weight* to the tail to
balance.
*Ifpossible,first attemptto balancethe model
by changing the position of the receiver
batteryand receiver.If youareunabletoobtain
good balance by doing so, then it will be
necessary to add weight to the nose or tail to
achieve the proper balance point.


2) Mount the wing to the fuselage. Using a
couple of pieces of masking tape, place them
on the top side of the wing 95mm back from
the leading edge, at the fuselage sides.
Aileron Control