Black Horse Model YAK 55M Owner's manual

SPECIFICATION
MadeinVietnam.


Wingspan : 2,250 mm 88.58 inches.


Length : 2,000mm 78.74 inches.


Weight : 8.3 kg 18.26 lbs.


Radio : 8 channels.


Servo : 8 servos.


Engine : OS.GT 55cc gas.
Instruction Manual book
ITEM CODE: BH114

YAK 55M - Item code: BH114.Instruction Manual
2
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manualthoroughlybeforestartingassemblyofyourYAK55M.Usethepartslistingbelowtoidentify
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
proceduresdesigned tohelpthenewpilotonhisway tosuccessfulR/Cflight.They willalsobeable
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.....
To avoidscratching yournew 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
aircraftandtoprotectthe table.Keep acouple
of jars or bowls handy to hold the small parts
after you open the bag.
Pleasetrial fitalltheparts.Makesureyouhave
the correct parts and that they fit and are
alignedproperlybeforegluing!Thiswillassure
proper assembly. YAK 55M ARFis hand made
from natural materials, every plane is unique
andminor adjustments may haveto 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-
installedelevator halves.
SUGGESTION.
NOTE.

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YAK 55M - Item code: BH114.Instruction Manual
Caution: this model is not a toy!
If you are a beginner to this type of powered
model,pleaseaskanexperiencedmodelflyer
forhelpand support. If youattempt to operate
themodel 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
Evenif you have already builta large number
ofRC models please readrightthrough 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: Blowwarmairover 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.
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
bebuiltinaveryshorttime.However,thework
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
taskscompetently-sopleaseworkslowly 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.
+ 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 besecurelyattached
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.
A.
B2.
D2.
B1.
C.
F1
E.
G.
D1.
A.Cowling.
B. Wing panel (B1,B2).
C.Fuselage.
D.Horizontal stabilizer.
(D1,D2).
E. Rudder.
F1.Aluminium tube wing
dihedral brace.
G. Decal sheet .
F2.Aluminium tube
Horizontal stabilizer.
F2
K
H

YAK 55M - Item code: BH114.Instruction Manual
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REPLACEMENT SMALL PARTS
2. Wheels.
3. Tie wrap.
1. Aluminium landing gear.
7. Plastic parts for rudder pushrod.
4. Fuel Tank.
6.Spinner.
 1. Install the rubber grommets and brass
eyelets onto the aileron servo.
1.INSTALLING THEAILERON SERVOS 1.
I. SERVO 1
5. Tail gear set .
1. 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.
Servo tray.
Bottom side.

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YAK 55M - Item code: BH114.Instruction Manual
Secure.
Installaileron controlhornas sameas
picturebelow.
Repeat the procedure for the other wing
half.
Controlhorn of Aileron
2 x 12mm.
3 x 30mm
2.Drill 1,5mm pilot holes through the block
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.
Electric wire.
Secure.
Drill a hole
1.5mm
diameter.
3. Instal servo tray with aileron servo into
the wing as same as picture below.
2.INSTALLING THE AILERON CON-
TROL HORN 1
Secure.

YAK 55M - Item code: BH114.Instruction Manual
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3.INSTALLING THE AILERON
LINKAGES 2.
1.INSTALLING THEAILERON SERVOS 2.
II. SERVO 2
3.INSTALLING THE AILERON
LINKAGES 1.
Installing the aileron linkages as pictures
below.
Secure
3x12mm.
2 x 12 mm.
Secure.
Controlhorn of Aileron
INSTALLING THE AILERON CONTROL HORN 2.
Aileron
control horn.
3x12mm.
70 mm
3 x 30mm
3x12mm.
70mm
M3

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YAK 55M - Item code: BH114.Instruction Manual
Repeat the procedure for the other wing
half.
bottom side.
Secure.
4x12mm.
See pictures below:
INSTALLING THE ENGINE MOUNT.
5 x 70mm
Drill a hole
7mm diameter.
INSTALLING THE ENGINE.
See pictures below:
Secure.

YAK 55M - Item code: BH114.Instruction Manual
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end of the line to the weighted clunk and the
otherendto the nylon pickup tube in thestop-
per.
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) Carefullybend the third nylon tube down
ata 45 degree angle (using a cigarette lighter).
This tubewillbeventtube to the fueling valve.
When the stopper assembly is installed in the
tank, the top of the vent tube should rest just
belowthe top surface ofthe tank. It shouldnot
touch the top of the tank.
INSTALLING THE STOPPER ASSEMBLY
1) The stopper has been pre-assembled
at the factory.
2) Using a modeling knife, cut one length
ofsiliconfuel line (the lengthof silicon fuel line
iscalculated by how theweightedclunkshould
restabout8mm away from therearof the tank
andmovefreely inside the tank). Connectone
Front view.
FUEL TANK.
Tygon gas tubing not included.
5) Test fit the stopper assembly into the
tank. It may be necessary to remove some of
the flashing around the tank opening using
amodelingknife. Ifflashing is present, make
sure none of it falls into the tank.
Pushrod
wire.
Left side
Right side.
Pushrod wire.

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YAK 55M - Item code: BH114.Instruction Manual
6) When satisfied with the alignment of
thestopper assemblytightenthe3mm x 20mm
machine screw until the rubber stopper ex-
pandsand 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.
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,thefrontofthetankshouldjustabout
touch the back of the firewall.
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,whereitexitsthefuselagebehindthe
enginemounting boxandtothe rearofthetank
at the forward bulkhead.
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
Secure.
Tie wrap.
Fueltank
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.
Tie Wrap
Cut off excess
INSTALLING THE THROTTLE SERVO.

YAK 55M - Item code: BH114.Instruction Manual
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Cut.
Secure.
Throttle wire.
Cut.
Secure.
Throttle servo
Throttle servo
Pushrod choke
Throttle wire.
Pushrod choke

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YAK 55M - Item code: BH114.Instruction Manual
PARTSREQUIRED
MAIN GEAR INSTALATION.
1)Assembleandmountingthe wheel pants
as shown in the following pictures.
Pushrod choke
Throttle wire.
Secure.
Bottom side.
6x20mm
Secure.

YAK 55M - Item code: BH114.Instruction Manual
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Repeat the process for the other wheel.
COWLING.
Seepicturebelow:
bottom side.
MOUNTING THE TAIL WHEEL
BRACKET.
See picture below:
3x15mm 3x12mm
Secure
Secure. 1. Slide the fiberglass cowl over the en-
gineandlineuptheback edge of the cowl with
the marks you made on the fuselage.
Top side.
Bottom side.
Bottom side

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YAK 55M - Item code: BH114.Instruction Manual
3. Slide the cowl back over the engine
andsecureit in place usingfourwood screws.
2. While keeping the back edge of the
cowl flush with the marks, align the front of
thecowl with the crankshaftoftheengine. 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 filler valve.
3x15mm
Top side.
Drill a hole
2mm diameter.
Secure.
Bottom side.
Trimand cut.
Drilla hole
10mmdiameter
Left side.
center line 1.
center
line 2
Markpoint1
Markpoint2

YAK 55M - Item code: BH114.Instruction Manual
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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.
INSTALLING THE ELEVATOR
SERVOS.
Installthespinnerbackplate,propellerand
spinner cone. The spinner cone is held in
placeusingtwo3mm x 8mm machine screws.
INSTALLING THE SPINNER.
Secure.
Elevatorservo
Front view.
Secure.
Front view
Markpoint
Drill a hole
5.2mm
diameter

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YAK 55M - Item code: BH114.Instruction Manual
Secure.
Left side.
HORIZONTAL STABILIZER.
Horizontal stabilizer installation
See picture below.
Right side.
Top side
Elevator control horn install as same as the
way of aileron control horn. Please see pic-
tures below.
ELEVATOR CONTROL HORN
INSTALLATION.
Elevator
control horn.
Secure
4x12mm.
3 x 30 mm. 3x12mm.
Secure

YAK 55M - Item code: BH114.Instruction Manual
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Left side.
 Elevatorpushrodinstall as same as theway
of aileron pushrod.
ELEVATOR PUSHROD INSTALLATION.
Secure
4x12mm
Bottom side
290mm.
Aluminium tube 12 mm.
Secure
Elevatorpushrod.
170 mm.
M3
3x12mm

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YAK 55M - Item code: BH114.Instruction Manual
Rudder servo install as same as method of
elevatorservo.
Seepicturebelow:
RUDDER SERVO INSTALLATION.
Elevatorpushrod.
Elevatorpushrod.
Elevatorpushrod.
Bottomside.
Rudder servo
Rudder servo
Rudder control horn install as same as the
way of aileron control horn. Please see pic-
tures below.
RUDDER CONTROL HORN INSTALLA-
TION.
Drill a hole
3.5mm
ControlhornofRudder.
3 x 40 mm
3 x 12mm
Secure
Rudder.
Control
Rudder.
Aluminium

YAK 55M - Item code: BH114.Instruction Manual
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Plastic parts of rudder cable
Cut
A+B Epoxy
PLUS glue.
1. Rudder push - pull system install as
same as picture below.
RUDDER CABLE INSTALLATION.
3 x 12mm
Secure
Secure.
Bottom side. Elevator
pushrod
Rudder
cable.
Rudder
cable.
Elevator
pushrod
Rudder cable
Cut

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YAK 55M - Item code: BH114.Instruction Manual
C/Aglue.


1. Cutout 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.
INSTALLING THE SWITCH.
Cut.


1. Plug the servo leads and the switch
leadintothe 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 vi-
bration.Usea rubber bandormasking tape to
hold the foam in place.
INSTALLINGTHERECEIVERANDBATTERY.
Do not permanently secure the re-
ceiver and battery until after balancing the
model.


3. Position the battery pack and receiver
behindthefueltank.Use twotie wraps to hold
the battery and receiver securely in place as
pictures below
Tie wrap.
Battery.
battery.
Switch
Left side.
C/Aglue.
Right side
Switch Receiver
Switch Engine.

YAK 55M - Item code: BH114.Instruction Manual
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*** 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 prop-
erly.
Locatethealuminiumwingdihedralbrace.
815 mm
615 mm
25mm 25mm
Rightwing.
WINGATTACHMENT.
Secure.
2. Attach the aluminium tube into the
fuselage.
3. Insert two wing panels as pictures
below.
Secure.
Receiver
Left wing.