Black Horse ZLIN 50LS Owner's manual

SPECIFICATION
Made in Vietnam.


 Wingspan : 2,145 mm 84.45 inches.


 Length :1,641 mm 64.61 inches.


 Weight : 5.7 kg 12.54 lbs.


 Radio : 5 channels.


 Servo : 7 servos.


 Glow Engine : 26 - 30cc gas.
Instruction Manual book
ITEM CODE:BH103.

ZLIN 50LS - Item code: BH103.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 ZLIN50LS. 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 supplier
and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training
procedures designed to help the new pilot on his way to successful R/C flight. They will also be 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.
Modelling knife.
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.
Landing gear.....
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
aircraft and to protect the table. Keep a 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 have
the correct parts and that they fit and are
aligned properly before gluing! This will assure
proper assembly. ZLIN50LSARF 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-
installed rudder.
(1) Horizontal stabilizer with pre-
installed elevator halves.
SUGGESTION.
NOTE.

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ZLIN 50LS - Item code: BH103.Instruction Manual
Caution: this model is not a toy!
If you are a beginner to this type of powered model, please ask an experienced model flyer for help
and support. If you attempt to operate the model 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
Even if you have already built a large number of RC models please read right through 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: Blow warm air over 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 be built in a very short time. However, the work 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.
+ Do not smoke near fuel
+ Store fuel in a cool, dry place, away from children and pets.
+ Wear safety glasses.
+The glow plug clip must be securely attached to the glow plug.
+ Do not flip the propeller with your fingers.
+ Keep loose clothing and wires away from the propeller.
+ 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 spinning propeler.
SAFETY PRECAUTION.
D. Horizon stabilizer.
B. Wing panel.
A. Cowling.
C.Fuselage
F. Aluminium wing dihedral brace.
B.
C.
D.
D.
A.
B.
F.
E.
G.
G. Decal sheet .
E. Vertical stabilizer.

ZLIN 50LS - Item code: BH103.Instruction Manual
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3. Wheels.
2. Wheel pants.
1. Aluminium landing gear.
7. Plastic parts for rudder pushrod.
6. Spinner.
 1. Install the rubber grommets and brass
eyelets onto the aileron servo.
INSTALLING THEAILERON SERVOS.
5.Engine mount ply of wood .
I. INSTALLING THE AILERON-FLAP
SERVO
Flap. Aileron.
Electric wire
Bottom side.
Thread
REPLACEMENT SMALL PARTS
4. Tail gear set.
8. Fuel Tank.
1.
2.
2.
3.
7.
1.
4.
5.
6.
8.
a.
b.
4) Install the aileron servo as same as pic-
ture.
3. 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.
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, re-
move the masking tape and the servo lead
from the thread.

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ZLIN 50LS - Item code: BH103.Instruction Manual
Repeat the procedure for the other wing
half.
INSTALLINGTHEAILERONCONTROLHORN
.
Install aileron control horn as same as
picture below.
Repeat the procedure for the other wing
half.
INSTALLING THE AILERON
LINKAGES.
Installing the aileron linkages as pictures
below.
Aileron
Control
horn.
Secure.
Secure.
3 x 25 mm.
75 mm
2x8mm.

ZLIN 50LS - Item code: BH103.Instruction Manual
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INSTALLING THE FLAP CONTROL HORN.
INSTALLING THE FLAP LINKAGES.
Installing the aileron linkages as pictures
Repeat the procedure for the other wing
half.
See pictures below:
Control horn of
the flap.
Secure.
Secure.
Bottom side
INSTALLING THE ENGINE MOUNT.
INSTALLING THE FLAP SERVO.
Thread
Electric
wire
Repeat the procedure for the other wing
half.
75 mm
3 x 25 mm.
2x8mm.

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ZLIN 50LS - Item code: BH103.Instruction Manual
Secure.
INSTALLING THE ENGINE.
Secure.
Left side.
Mount ply of
wood .
3 X 12 mm
Drill a hole
4mm diameter.
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.
INSTALLING THE THROTTLE CABLE.
Throttle servo

ZLIN 50LS - Item code: BH103.Instruction Manual
8
INSTALLING THE STOPPER ASSEMBLY
FUEL TANK.
1. The stopper has been pre-assembled at
the factory.
2. Using a modeling knife, cut one length of
silicon fuel line (the length of silicon fuel line is
calculated by how the weighted clunk should
rest about 8mm away from the rear of the tank
and move freely inside the tank). Connect one
end of the line to the weighted clunk and the
other end to the nylon pick up tube in the stop-
per.
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.
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. Carefully bend the third nylon tube down
at a 45 degree angle (using a cigarette lighter).
This tube will be vent tube to the fueling valve.
Throttle cable.
Tygon gas tubing not included.

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ZLIN 50LS - Item code: BH103.Instruction Manual
Vent tube Fuel pick- up tube
Fuel fill tube
6. When satisfied with the alignment of the
stopper assembly tighten the 3mm x 20mm
machine screw until the rubber stopper ex-
pands 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.
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 front of the tank should just about
touch the back of the firewall.
Secure.
Blow through one of the lines to ensure
the fuel lines have not become kinked inside
the fuel t ank comp artment. Air should flow
through easily.
9. To secure the fuel tank in place, apply a
bead of silicon sealer to the forward area of
the tank, where it exits the fuselage behind the
engine mounting box and to the rear of the tank
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.
Fuel tank.
1. Slide the fiberglass cowl over the en-
gine and line up the back edge of the cowl with
the marks you made on the fuselage.
COWLING.
Top side
5. Test fit the stopper assembly into the
tank. It may be necessary to remove some of
the flashing around the tank opening using
a modeling knife. If flashing is present, make
sure none of it falls into the tank.

ZLIN 50LS - Item code: BH103.Instruction Manual
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Bottom side.
Left side.
Machine screw.
Install the spinner backplate, propeller and
spinner cone. The spinner cone is held in
place using two 3mm x 8mm machine
screws.
INSTALLING THE SPINNER.
Front view.
Left side
2. While keeping the back edge of the
cowl flush with the marks, align the front of
the cowl with the crankshaft of the engine. 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. Install the muffler and muffler extension
onto the engine and make the cutout in the
cowl for muffler clearance. Connect the fuel
and pressure lines to the carburetor , muffler
and fuel filler valve.
3. Slide the cowl back over the engine
and secure it in place using four wood screws.
See picture below.
3 x 12mm
Bottom side.
Trim and cut

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ZLIN 50LS - Item code: BH103.Instruction Manual
Secure.
Secure.
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
SERVO.
HORIZONTAL STABILIZER.
Elevator servo
198 mm
9 mm

ZLIN 50LS - Item code: BH103.Instruction Manual
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Elevator control horn install as same as the
way of aileron control horn. Please see pic-
tures below.
ELEVATOR CONTROL HORN AND
ELEVATOR PUSHROD INSTALLATION.
Secure.
Secure.
Secure.
3 x 15mm
Elevator control
horn.
Elevator
pushrod
Elevator
pushrod
Bottom side.
3 x 20 mm.
2 x 8mm
2 x 8mm

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ZLIN 50LS - Item code: BH103.Instruction Manual
Plastic parts of elevator
pushrod.
C/A glue
Rudder servo install as same as method of
elevator servo. See picture below:
VERTICAL INSTALLATION.
Rudder servo
Aluminium
A + B Epoxy
glue.

ZLIN 50LS - Item code: BH103.Instruction Manual
14
Rudder control horn install as same as the
way of aileron control horn. Please see pic-
tures below.
RUDDER CONTROL HORN INSTALLA-
TION.
Control horn of Rudder.
1. Rudder pushrod install as same as
the way of aileron control horn.
2. Rudder push - pull system install as
same as picture below.
RUDDER PUSHROD INSTALLATION.
Secure.
Rudder
control horn
3 x 35 mm
Elevator pushrod
Elevator pushrod
Rudder cable
Bottom side.
Top side.
2 x 8mm
2 x 8mm

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ZLIN 50LS - Item code: BH103.Instruction Manual
C/A glue.
Secure.
Secure.
Secure.
Secure.
Bottom side
Rudder cable
Rudder cable
Rudder
pushrod.
HORIZONTAL STABILIZER STRUTS.
3 x 15mm.

ZLIN 50LS - Item code: BH103.Instruction Manual
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Secure.
Drill a hole
3mm diameter.
MOUNTING THE TAIL WHEEL
BRACKET.
3x12mm
3x15mm
PARTSREQUIRED
MAIN GEAR INSTALATION.
Secure.
Secure.
a.b.

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ZLIN 50LS - Item code: BH103.Instruction Manual
 1) Assemble and mounting the wheel pants
as shown in the following pictures.
Secure.
Secure.
Bottom side.


1. Cut out 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.
Switch
Mark point
Switch
Repeat the process for the other wheel.

ZLIN 50LS - Item code: BH103.Instruction Manual
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Locate the aluminium wing dihedral brace.
*** 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.
Do not permanently secure the re-
ceiver and battery until after balancing the
model.
WINGATTACHMENT.


1. Plug the servo leads and the switch
lead into the receiver. You may want to plug
an aileron extension into 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 a rubber band or masking tape to
hold the foam in place.
INSTALLINGTHERECEIVERANDBATTERY.


3. Position the battery pack and receiver
behind the fuel tank. Use two tie wraps to hold
the battery and receiver securely in place as
pictures below
UBEC.
BATTERY OF
ENGINE.
UBEC
Battery of
Receiver.
Receiver
Receiver
Tie wrap.
983 mm
25 mm

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ZLIN 50LS - Item code: BH103.Instruction Manual
See picture wing attach to fuselage.
Installing the fuselage hatch as same
as picture below.
Right wing.
Secure.
Left side
Wing bolt.
Receiver
Drill a hole
3mm diameter.
Top side
Wing bolt
6x 70mm.
Drill a hole
3mm diameter
Secure.
4 x 40mm
Secure.

ZLIN 50LS - Item code: BH103.Instruction Manual
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

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 GRA VITY IS LOCA TED
115mm 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 115 mm back from
the leading edge, at the fuselage sides.


3. Turn the airplane up side down. Place
your fingers on the masking tape and carefully
lift the plane .
 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” and you must add
weigh* to the nose. If the nose drops, it is “nose
heavy” and you must add weight* to the tail to
balance.
Accurately mark the balance point on the top
of the wing on both sides of the fuselage. The
balance point is located 115mm back from the
leading edge. This is the balance point at which
your model should balance for your first flights.
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
smoothness and arrow- like tracking, but it may
then require more speed for take off and make
it more difficult to slow down for 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 .
*If possible, first attempt to balance the model
by changing the position of the receiver
battery and receiver. If you are unable to obtain
good balance by doing so, then it will be
necessary to add weight to the nose or tail to
achieve the proper balance point.
Top side
BALANCING.
Ailerons : 15mm up 15mm down
Flap : 30mm down
Elevator : 12mm up 12mm down
Rudder : 20mm right 20mm left.


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.
We wish you many safe and enjoy-
able flights with your ZLIN 50LS.
PRE-FLIGHT CHECK.
115
Flap control
Aileron control
Elevator control
Rudder control
15mm
15mm
12mm
12mm
30mm
20mm
20mm