Black Horse Model EP-TRAINER Owner's manual

Instruction Manual book
SPECIFICATION
MadeinVietnam.


Wingspan : 1,320mm 52 in.


Length : 1,080mm 42.52in.


Weight : 1.10kg 2.42Lbs.


Partslisting required(not included).


Battery: 3CELLS-LI-POLY-11.1V-2000mA.h.


Electricmotor :AXI2808/24.


Radio : 04 channels.


Servo : 03 servos.


Propeller : 9 x 5


Speed control : 25A.

EP-TRAINER.
2
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual thoroughly before starting assembly of your EP-TRAINER. 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
proceduresdesignedtohelp thenew pilotonhiswayto successfulR/C flight.Theywillalsobe 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.
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,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 toprotectthe table.Keep acouple
of jars or bowls handy to hold the small parts
after you open the bag.
Pleasetrialfitall theparts.Makesureyou have
the correct parts and that they fit and are
alignedproperlybefore gluing!Thiswill assure
proper assembly. EP-TRAINER 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
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.

Instruction Manual.
3
+ This is not a toy
+ Be sure that no other flyers are using your
radio frequency.
+ Wear safety glasses.
+ Keep loose clothing and wires away from
thepropeller.
+ Do not start the motor if people are near.
Donot standin linewith theside ofthepropel-
ler.
+ Make motor adjustments from behind the
propeller only. Do not reach around the spin-
ningpropeller.
SAFETY PRECAUTION.
SERVO INSTALLATION.
Because the size of servos differ, you
may need to adjust the size of the precut
opening in the mount. The notch in the
sidesofthe mountallowthe servoleadtopass
through.
C/A glue
1) Install the rubber grommets and brass
eyeletsontotheaileron servo.Testfittheservo
into the aileron servo mount.
C/A glue
C/A glue
C/A glue

EP-TRAINER.
4
5) Using Kwik Bond 5 Minute Epoxy, glue
the servo mount into place. Remove any ex-
cess epoxy using a paper towel and rubbing
alcohol. Use pieces of masking tape to hold
the tray in place until the epoxy fully cures.
3) While holding the servo mount firmly in
place, trace around it using a pen.
4) Remove the mount, and using a model-
ing knife, carefully remove the covering from
inside the outline you drew.
2) Remove the aileron servo. Place the
mountonto thewing,aligning thecutoutin the
mount with the cutout in the wing. The two
notches in the mount should face the leading
edge of the wing.
C/A glue
Epoxyglue
Remove covering
Markline
Servomount.

Instruction Manual.
5
1) Thread one nylon adjustable control
hornonto eachaileron torquerod. Threadthe
horns on until they are flush with the ends of
the torque rods.
2) Thread one nylon clevis at least 5/16”
onto each of the two 2mm x 100mm threaded
wires.
6)Using amodelingknife, carefullyremove
the covering from servo mount.
Remove covering
7) Install the aileron servo into the servo
mount, withthe outputshafttowards thelead-
ing edge of the wing, using the wood screws
provided with your radio system. Drill 1/16”
pilotholes throughthe mountbefore installing
the screws. This will prevent the wood from
splitting.
Aileronservo.


2)Test fit the aluminium dihedral brace
into each wing half. The brace should slide in
easily.
WINGASSEMBLY.
1) Location the aluminium wing dihedral
brace.
Aluminium.
INSTALLING THE AILERON LINKAGE.
Epoxy glue

EP-TRAINER.
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Installing steering arm as follow
Steering arm.
3) Withthe aileronservo centered,install
theservo armonto theservo. The armshould
beinstalledsoitis parallelwith thetrailingedge
of the wing.
Bend and cut after.
Aileronpushrod.
4) Slide the pushrod wires following pic-
tureabove.
NOSE GEAR INSTALLATION.

Instruction Manual.
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INSTALLING ELECTRIC MOTOR.
See pictures below:
Push .
Motor mount wood:
3 X 10mm
Adjust the nose gear steering arm until the
arm is parallel with the fire wall.
Secure
Secure
Steering arm.
3 X 12 mm
C/Aglue
Epoxy glue

EP-TRAINER.
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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
thecowl with thecrankshaftof themotor. 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.
Secure
Rotor shaft
Motor
Front view.
1) Slide the cowl over the motor and line
up the back edge of the cowl with the marks
you made on the fuselage.
COWLING.

Instruction Manual.
9
elevator servo
HORIZONTALSTABILIZER.
2. Mount the servo to the tray using the
mountingscrews providedwithyourradio sys-
tem.
ELEVATOR INSTALLATION.
SERVO INSTALLATION.
1. Install the rubber grommets and brass
colletsintotheelevator servo.Testfitthe servo
into the servo tray.
Remove covering.
 1. Using a modeling knife, carefully re-
move the covering at the mounting slot of
horizontal stabilizer(both sideof fuselage).

EP-TRAINER.
10
Markline
Top side
Remove covering.
Top side.
Top side.
Bottom side.


2) Using a ruler and a pen, locate the
centerlineofthehorizontalstabilizer, atthetrail-
ingedge,and placeamark. Useatraingle and
extend this mark, from back to front, across
the top of the stabilizer.Also extend this mark
downthe backof thetrailing edgeof thestabi-
lizer .
3. Slidethestabilizerinto placein theprecut
slot in the rear of the fuselage.The stabilizer
should be pushed firmly against the front of
the slot.
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.
5. Remove the stabilizer. Using the lines
youjust drewas aguide, carefullyremove the
coveringfrom betweenthemusing amodeling
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
balsastructure mayweakenit. Thiscouldlead
to possible failure during flight
Bottom side.
Bottom side
Markline
Center line.

Instruction Manual.
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Epoxyglue.
C/A glue.
C/A glue.
C/A glue.
C/A glue.
 6. 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. Slidethestabilizerin placeand
re-align. Double check all of your measure-
ments one more time before the epoxy cures.
Holdthestabilizerinplace withT-pinsormask-
ing tape and remove any excess epoxy using
a paper towel and rubbing alcohol.
7. After the epoxy has fully cured, re-
move the masking tape or T-pins used to
hold the stabilizer in place and carefully in-
spectthe glue joints. Use more epoxy to fill
in any gaps that may exits that were not
filled previously and clean up the excess us-
ing a paper towel and rubbing alcohol.
Check to mark sure the wing and stabi-
lizer are paralell. If they are not, lightly sand
theopening inthe fuselagefor thestabilizer
until the stabilizer is paralell to the wing.

EP-TRAINER.
12
CONTROL HORN INSTALLATION.
See pictures below:
2 X 12mm.
Markpoint
Bend.
Elevator
pushrod
Elevator
control horn

Instruction Manual.
13
VERTICAL STABILIZER INSTALLATION.
Hinge.
Remove covering.
Pen.
Remove covering.
1. Using a modeling knife, remove the
covering from over the precut hinge slot cut
intothelower rearportionofthe fuselage. This
slot accepts the lower rudder hinge.
2. Slidethe verticalstabilizerinto theslot
in the top of the fuselage. The rear edge of
thestabilizer shouldbeflushwiththerear edge
of the fuselage and the lower rudder hinge
should engage the precut hinge slot in the
lowerfuselage. The bottomedge ofthe 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.
Hingeslot
4. Remove the stabilizer. Using a model-
ing knife, remove the covering from below the
linesyoudrew. Alsoremovethe coveringfrom
the bottom edge of the stabilizer.
Elevator pushrod
Rudder servo

EP-TRAINER.
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90º
Vertical
Stabilizer.
Horizontal
Stabilizer.
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
stabilizerinplace withT-pinsor maskingtape.
Allow the epoxy to fully cure before proceed-
ing.
Epoxy glue.
C/Aglue.
C/Aglue.
C/Aglue.
RUDDERCONTROLHORNINSTALLATION.
Rudder control horn install as same as the
way of elevator control horn. Please see pic-
tures below.
When cutting through the covering to re-
move it, cut with only enough pressure
toonly cut throughthe coveringitself. Cutting
into the balsa structure may weaken it.
5. Slide the vertical stabilizer back in
place. Using a triangle, check to ensure that
thevertical stabilizeris aligned90º tothe hori-
zontal stabilizer.
Mark point

Instruction Manual.
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 Rudder pushrod install as same as the way
of aileron pushrod.
RUDDER PUSHROD INSTALLATION.
Elevator
pushrod. Rudder
pushrod.
Cut
Secure
Nose gear pushrod.
Rudder pushrod.
Rudder
control horn
Rudderpushrod.
Elevator pushrod.
Nose gear pushrod.

EP-TRAINER.
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

1) Using a modeling knife, remove the
covering from over the two main gear mount-
ingslots locatedin thebottom ofthe fuselage.


2) Using the two landing gear straps as a
guide, mark the locations of the four mount-
ing screws onto the fuselage surface.


3) The landing gear wire is held in place
using two nylon landing gear straps and four
wood screws.
MAIN GEAR INSTALLATION.


3) Do not permanently secure the re-
ceiver and battery until after balancing the
model.


4)Using a2mm drill bit,drill ahole through
the side of the fuselage, near the receiver, for
the antenna to exit.
Remove covering
Secure.


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 vi-
bration.Use arubber bandor maskingtape to
hold the foam in place.
INSTALLINGTHERECEIVERANDBATTERY.
3 x 12 mm
Nilon strap
Collars
Secure

Instruction Manual.
17
Recever
ATTACHMENT WING-FUSELAGE.
See pictures below:
Markpoint
Insert and secure
Battery

EP-TRAINER.
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

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 75 mm back from
the leading edge, at the fuselage sides.
BALANCING.
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.Thisisthe balancepointat which
yourmodelshould balanceforyour firstflights.
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 toslowdown forlanding. 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,the model is“tail heavy” andyou mustadd
weigh*tothenose. Ifthenosedrops,it is“nose
heavy” and you must add weight* to the tail to
balance.
*Ifpossible, firstattempt to 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.
CG
75mm


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.


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.
Ailerons : 15mm up 15mm down.
Elevator : 20mm up 20mm down.
Rudder : 15mm right 15mm left.
Aileron Control
20
20
We wish you many safe and enjoy-
able flights with your EP-TRAINER.