Black Horse Model YAK 54 Owner's manual

SPECIFICATION
MadeinVietnam.
INSTRUCTION MANUAL BOOK.
Wingspan : 107 cm 42.13 in.
Length : 92 cm 36.22 in.
Weight : 0.8kg 1.76 lbs.
Radio : 4 channels.
Servo : 4 servos.
Partslistingrequired(notincluded):
Electric Motor: AXI 2808/24.
Battery : 3 CELLS - LI - POLY - 11.1v-2000mA.h.
Propeller : 11 x 3.8.
Speed Control: 25A.
ITEM CODE: BH46.

YAK 54-EP. 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 YAK 54- EP. 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.....
To avoidscratching your newairplane,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.
Pleasetrialfitalltheparts. Makesureyouhave
the correct parts and that they fit and are
alignedproperly beforegluing!Thiswillassure
proper assembly. YAK 54- EP 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-
installedelevator halves.
SUGGESTION.
NOTE.

YAK 54-EP. INSTRUCTION MANUAL.
3
SAFETY PRECAUTION.
Caution: this model is not a toy!
If you are a beginner to this type of powered
model,please askan experiencedmodelflyer
forhelp andsupport.Ifyouattempttooperate
themodel withoutknowingwhat youaredoing
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
Evenifyou havealready built alarge number
ofRC modelspleaseread rightthrough 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: Blowwarm airoverthearea
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
bebuilt inavery shorttime.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
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.
+ This is not a toy
+ Be sure that no other flyers are using your
radio frequency.
+Theglowplugclipmustbesecurelyattached
to the glow plug.
+ Do not flip the propeller with your fingers.
+ Keep loose clothing and wires away from
thepropeller.
+ Do not start the motor if people are near.
Donot standinlinewiththesideof thepropel-
ler.
3) Turn the wing panel right side up. Using
a modeling knife, remove the covering at
possition show below.
1) Install the rubber grommets and brass
eyelets onto the aileron servo.
2) Install the metal connector onto servo
arm.
INSTALLING THE AILERON SERVOS.
Bottomofwing.

YAK 54-EP. INSTRUCTION MANUAL.
4
Repeat the procedure for the other
wing half.
Servowire.
5) Attach the micro control connector to
the servo arms. Be sure to use the lock tie but
it could free rotation.
Temporary pin to
keep hinge centered.
Assemble then apply drops of thin
C/A to center of hinge,on both sides.
C/Aglue.
Cutthecovering
awayfromtheslot.
4) Install the aileron servo as same as
picture.
Remove the covering. Microcontrol
connector.
C/Aglue.

YAK 54-EP. INSTRUCTION MANUAL.
5
Pen.
aileron control horn.
1) Using a ruler & pen to draw a straight
line as below picture.
INSTALLINGTHEAILERON CONTROLHORN.
INSTALLING THEAILERON CONTROLHORN.
Insert aileron control horn to the aileron.
C/Aglue.
C/Aglue.

YAK 54-EP. INSTRUCTION MANUAL.
6
Repeat the procedure for the other
wing half.
Motor mount wood:
3*10mm
Cut.
C/Aglue.
C/Aglue.
INSTALLING ELECTRIC MOTOR.
See pictures below:

YAK 54-EP. INSTRUCTION MANUAL.
7
1) Slide the cowl over the motor and line
up the back edge of the cowl with the marks
you made on the fuselage.
Push .
C/Aglue.
Rotor shaft.
Motor.
Front view.
COWLING.
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.
3x10mm.

YAK 54-EP. INSTRUCTION MANUAL.
8
1) Install the rubber grommets and brass
eyelets onto the rudder and elevator servo.
2) Install the metal connector onto servo
arm.
3) Using a modeling knife, remove the
covering at servo tray and at fuselage slot.
4) Drill1,6mm pilotholesthroughtheblock
of wood for each of the mounting screws
provided with the servo.
Secure the cowling.
Secure.
Machinescrews.
INSTALLING THE SPINNER.
2x10mm.
SERVO INSTALLATION.
Remove covering.

YAK 54-EP. INSTRUCTION MANUAL.
9
Repeat the procedure for the other
servo.
1) Using a modeling knife, carefully re-
move the covering from over the vertical sta-
bilizermountingslot inthe topof thefuselage.
3) Slidethe stabilizerintoplace inthepre-
cut slot in the rear of the fuselage. The stabi-
lizer should be pushed firmly against the front
of the slot.
2) Draw a center line onto the horizontal
stabilizer. Then slide the horizontal into the
fuselage.
Remove covering.
HORIZONTAL STABILIZER
INSTALLATION.
Topside.
Pen. Bottomside.

YAK 54-EP. INSTRUCTION MANUAL.
10
5) Remove thestabilizer. Usingthe lines
youjustdrew asa guide,carefully removethe
covering from between them using a model-
ingknife.
When cutting through the covering to re-
moveit, cutwithonly enoughpressure toonly
cut through the covering itself. Cutting into
the balsa structure may weaken it.
4) With the stabilizer held firmly 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 left sides and top and
bottom of the stabilizer.
C/Aglue.
C/Aglue.
Push
Bottomelevator
Topelevator
Remove covering.

YAK 54-EP. INSTRUCTION MANUAL.
11
6) When you are sure that everything is
alignedcorrectly,mix upagenerous amountof
Flash30MinuteEpoxy. Applyathinlayertothe
mounting slot in the top of the fuselage and to
the sides and bottom of the vertical stabilizer
mountingarea. Apply epoxytothe bottomand
top edges of the filler block and to the lower
hinge also. Set the stabilizer in place and re-
align. 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.
Control horns elevator and rudder as same
as method of aileron wing. See pictures be-
low:
C/Aglue.
C/Aglue.
CONTROL HORN INSTALLATION.
elevator and rudder control horn.
elevator and rudder pushrod wire
Remove covering & make a slot on the
elevator for placing to insert aileron control
horn.
Pen
straight line
Remove covering.
Bottom size

YAK 54-EP. INSTRUCTION MANUAL.
12
Hingeslot.
2) Slidethe verticalstabilizer intothe slot
in the top of the fuselage. The rear edge of
thestabilizershouldbe flushwiththerearedge
of the fuselage and the lower rudder hinge
should engage the precut hinge slot in the
lower fuselage. The bottom edge of the stabi-
lizer should also be firmly pushed against the
top of the horizontal stabilizer.
3) While holding the vertical stabilizer
firmly in place, use a pen and draw a line on
each side of the vertical stabilizer where it
meets the top of the fuselage.
C/Aglue.
Pushrod install as same as method of ai-
leron wing. See pictures below:
INSTALLINGTHE ELEVATOR PUSHROD.
PUSHROD INSTALLATION.
Elevator pushrod.
Control horn.
Remove covering.
INSTALLING RUDDER.
Pen.

YAK 54-EP. INSTRUCTION MANUAL.
13
When cutting through the covering to remove
it, cut with only enough pressure to only cut
through the covering itself. Cutting into the
balsa structure may weaken it.
5) Slide the vertical stabilizer back in
place. Using a triangle, check to ensure that
thevertical stabilizerisaligned 90ºto thehori-
zontal stabilizer.
4) Remove the stabilizer. Using a mod-
eling knife, remove the covering from below
the lines you drew. Also remove the covering
from the bottom edge of the stabilizer and the
bottomand topedgesofthefiller block. Leave
the covering in place on the sides of the filler
block.
Remove covering.
90º Vertical
Stabilizer.
Horizontal
Stabilizer.
C/Aglue.
3) When you are sure that everything is
aligned correctly, mix up a generous amount
ofFlash 30Minute Epoxy.Applyathinlayerto
thetopand bottomofthe verticalfin mounting
platformsidesin thefuselage.Slidethevertical
fin in place and realign. Double check all of
your measurements once more before the
epoxy cures. Hold the vertical fin in place with
T-pins or masking tape and remove any
excessepoxy usingapapertoweland rubbing
alcohol.
C/Aglue.
C/Aglue.

YAK 54-EP. INSTRUCTION MANUAL.
14
Remove covering.
INSTALLING THE RUDDER PUSHROD.
Remove covering & make a slot on the rudder for
placing to insert rudder control horn.
straight line
Remove covering.
C/Aglue.
Rudder
pushrod.
Cut.

YAK 54-EP. INSTRUCTION MANUAL.
15
Parts required the full set of the landing gear:
LANDING GEAR INSTALLATION.
2x10mm
Wood collar.
Cut and drill the wheel pant:
Elevator pushrod.
Rudder pushrod.
Cut
Dill 2.0mm hole.
Attach the landing gear,wheel pant, collar,
wheel and secure them:

YAK 54-EP. INSTRUCTION MANUAL.
16
2) The landing gear wire is held in place
using two nylon landing gear straps and four
wood screws.
Repeat the process for the other wheel:
1) Usingthe twolandinggear strapsas a
guide, mark the locations of the four mount-
ing screws onto the fuselage surface.
Prepare the plastic plate:
C/Aglue.
C/Aglue.

YAK 54-EP. INSTRUCTION MANUAL.
17
secure
See pictures below:
Made the slot from the bottom of the rudder:
Rudder control
Nilon clasp.
Tail gear.
MOUNTING THE TAIL WHEELBRACKET.
Install the tail gear:
Install the Nilon clasp:
C/Aglue.

YAK 54-EP. INSTRUCTION MANUAL.
18
Receiver.


3) Donotpermanentlysecurethereceiver
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.


1) Plug the servo leads and the switch
lead into the receiver. Plug the battery pack
lead into the switch.


2) Wrap the receiver and battery pack in
the protective foam to protect them from
vibration.
INSTALLINGTHE RECEIVERANDBATTERY.
Battery.

YAK 54-EP. INSTRUCTION MANUAL.
19
See pictures below:
ATTACHMENT WING-FUSELAGE.
aluminium wing dihedral brace.
Push.
wing bolt
secure.
wing bolt
Push.

YAK 54-EP. INSTRUCTION MANUAL.
20
*Ifpossible,first attemptto balancethe model
by changing the position of the receiver bat-
tery and receiver. If you are unable to obtain
good balance by doing so, then it will be nec-
essary to add weight to the nose or tail to
achieve the proper balance point.


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 sur-
face.


3) Check to be sure the control surfaces
move in the correct directions.
CONTROL THROWS.


1) Completely charge your transmitter and
receiver batteries before your first day of fly-
ing.


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.
PRE-FLIGHT CHECK.
We wish you many safe and enjoyable
flights with your YAK 54-EP.
CG
75mm
Ailerons : 15mm up 15mm down
Elevator : 15mm up 15mm down
Rudder : 20mm right 20mm left
AileronsControl


3. Turn the airplane upside down. Place
your fingers on the masking tape and care-
fully lift the plane .


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
75MM 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 75mm back from
the leading edge, at the fuselage sides.
Accurately mark the balance point on the top
of the wing on both sides of the fuselage. The
balance point is located 75mm back from the
leadingedge.This isthe balancepointatwhich
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 smooth-
ness and arrow- like tracking, but it may then
require more speed for take off and make it
moredifficult toslow downfor 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 .
 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” andyoumust add
weigh*tothenose. Ifthenosedrops,it is“nose
heavy” and you must add weight* to the tail to
balance.
BALANCING.