Instruction Manual book - Black Horse, Stepney n… · YAK 55M ARF is hand made from natural materials, every plane is unique and minor adjustments may have to be made. However, you

SPECIFICATION

Made in Vietnam.

Wingspan : 2,250 mm 88.58 inches. Length : 2,000 mm 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

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This instruction manual is designed to help you build a great flying aeroplane. Please read thismanual thoroughly before starting assembly of your YAK 55M. Use the parts listing below to identifyall parts.

WARNING.

Please be aware that this aeroplane is not a toy and if assembled or used incorrectly it iscapable of causing injury to people or property. WHEN YOU FLY THIS AEROPLANE YOUASSUME ALL RISK & RESPONSIBILITY.

If you are inexperienced with basic R/C flight we strongly recommend you contact your R/C supplierand join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of trainingprocedures designed to help the new pilot on his way to successful R/C flight. They will also be ableto 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.

HARDWARE PACK

COWLING.Landing gear.....

To avoid scratching your new airplane, do notunwrap the pieces until they are needed forassembly. Cover your workbench with an oldtowel or brown paper, both to protect theaircraft and to protect the table. Keep a coupleof jars or bowls handy to hold the small partsafter you open the bag.

Please trial fit all the parts. Make sure you havethe correct parts and that they fit and arealigned properly before gluing! This will assureproper assembly. YAK 55M ARF is hand madefrom natural materials, every plane is uniqueand minor adjustments may have to be made.However, you should find the fit superior andassembly simple.The painted and plastic parts used in this kitare fuel proof. However, they are not tolerantof many harsh chemicals including thefollowing: paint thinner, C/A glue accelerator,C/A glue debonder and acetone. Do not letthese chemicals come in contact with thecolors on the covering and the plastic parts.

PARTS LISTING.

FUSELAGE ASSEMBLY (1) Fuselage.

WING ASSEMBLY

(1) Right wing half with pre-installedaileron.

(1) Left wing half with pre-installedaileron.

Tail section assembly

(1) Vertical stabilizer with pre-installed rudder.

(1) Horizontal stabilizer with pre-installed elevator halves.

SUGGESTION.

NOTE.

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Caution: this model is not a toy!If you are a beginner to this type of poweredmodel, please ask an experienced model flyerfor help and support. If you attempt to operatethe model without knowing what you are doingyou could easily injure yourself or somebodyelse. Please keep your safety and well-beingin mind at all times.Important: before you start constructionEven if you have already built a large numberof RC models please read right through theseinstructions and check all the kit componentsagainst the parts list. We have taken greattrouble to keep construction as simple aspossible, without making any compromisesin the area of safety.Note regarding the film coveringMinor creases or bubbles may develop in thefilm covering due to major fluctuations inweather conditions (temperature, humidityetc.); in rare cases you may even find a slightwarp in a component. These minor faults arein the nature of film-covered built-up woodenstructures, and can easily be corrected usinga heat gun, as commonly used for modelling.Creases: Blow warm air over the area

and rub down with a softcloth.

Wing warp: Hold the panel twistedgently in the oppositedirection to the warp, andapply warm air to removethe creases from thecovering.

Caution! do not heat the film more than isabsolutely necessary. If the air or the iron istoo hot, the film may melt and holes may beformed.This model is highly pre-fabricated and canbe built in a very short time. However, the workwhich you have to carry out is important andmust be done carefully. The model will onlybe strong and fly well if you complete yourtasks competently - so please work slowly andaccurately.When self-tapping screws have to bescrewed into wood, apply a little white glueto prevent them shaking loose: just squirtwhite glue into the hole and fit the screw.

+ This is not a toy + Be sure that no other flyers are using yourradio frequency. + Do not smoke near fuel + Store fuel in a cool, dry place, away fromchildren and pets. + Wear safety glasses. +The glow plug clip must be securely attachedto the glow plug. + Do not flip the propeller with your fingers. + Keep loose clothing and wires away fromthe propeller. + Do not start the engine if people are near.Do not stand in line with the side of thepropeller. + Make engine adjustments from behind thepropeller only. Do not reach around thespinning propeller.

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


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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 brasseyelets onto the aileron servo.

1.INSTALLING THE AILERON SERVOS 1.

I. SERVO 1

5. Tail gear set .

1. Using the thread as a guide and usingmasking tape, tape the servo lead to the endof the thread: carefully pull the thread out.When you have pulled the servo lead out, re-move the masking tape and the servo leadfrom the thread.

Bottom side.

Servo tray.

Bottom side.

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Secure.

Install aileron control horn as same aspicture below.

Repeat the procedure for the other winghalf.

Control horn of Aileron

2 x 12mm.

3 x 30mm

2. Drill 1,5mm pilot holes through the blockof wood for each of the four mounting screwsprovided with the servo. Install servo into ai-leron servo tray as same as picture below.

Electric wire.

Secure.

Drill a hole1.5mmdiameter.

3. Instal servo tray with aileron servo intothe wing as same as picture below.

2.INSTALLING THE AILERON CON-TROL HORN 1

Secure.


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3.INSTALLING THE AILERONLINKAGES 2.

1.INSTALLING THE AILERON SERVOS 2.

II. SERVO 2

3.INSTALLING THE AILERONLINKAGES 1.

Installing the aileron linkages as pictures below.

Secure3x12mm.

2 x 12 mm.

Secure.

Control horn of Aileron

INSTALLING THE AILERON CONTROL HORN 2.

Aileroncontrol horn.

3x12mm.70 mm

3 x 30mm

3x12mm.70mmM3

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Repeat the procedure for the other winghalf.

bottom side.

Secure.

4x12mm.

See pictures below:

INSTALLING THE ENGINE MOUNT.

5 x 70mm

Drill a hole7mm diameter.

INSTALLING THE ENGINE.

See pictures below:

Secure.


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end of the line to the weighted clunk and theother end to the nylon pick up tube in the stop-per. 3) Carefully bend the second nylon tubeup at a 45 degree angle (using a cigarettelighter). This tube will be the vent tube to themuffler. 4) Carefully bend the third nylon tube downat a 45 degree angle (using a cigarette lighter).This tube will be vent tube to the fueling valve.

When the stopper assembly is installed in thetank, the top of the vent tube should rest justbelow the top surface of the tank. It should nottouch the top of the tank.

INSTALLING THE STOPPER ASSEMBLY

1) The stopper has been pre-assembledat the factory. 2) Using a modeling knife, cut one lengthof silicon fuel line (the length of silicon fuel lineis calculated by how the weighted clunk shouldrest about 8mm away from the rear of the tankand move freely inside the tank). Connect one

Front view.

FUEL TANK.

Tygon gas tubing not included.

5) Test fit the stopper assembly into thetank. It may be necessary to remove some ofthe flashing around the tank opening usinga modeling knife. If flashing is present, makesure none of it falls into the tank.

Pushrodw i r e .

Left side

Right side.

Pushrod wire.

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6) When satisfied with the alignment ofthe stopper assembly tighten the 3mm x 20mmmachine screw until the rubber stopper ex-pands and seals the tank opening. Do not overtighten the assembly as this could cause thetank to split. 7) Using a modeling knife, cut 3 lengths offuel line 150mm long. Connect 2 lines to the 2vent tubes and 1 line to the fuel pickup tube inthe stopper.

8) Feed three lines through the fuel tankcompartment and through the pre-drilled holein the firewall. Pull the lines out from behindthe engine, while guiding the fuel tank intoplace. Push the fuel tank as far forward aspossible, the front of the tank should just abouttouch the back of the firewall.

Blow through one of the lines to ensurethe fuel lines have not become kinked insidethe fuel tank compartment. Air should flowthrough easily.

9) To secure the fuel tank in place, apply abead of silicon sealer to the forward area ofthe tank, where it exits the fuselage behind theengine mounting box and to the rear of the tankat the forward bulkhead.

Do not secure the tank into place perma-nently until after balancing the airplane. Youmay need to remove the tank to mount thebattery in the fuel tank compartment

Secure.

Tie wrap.

Fuel tank

1. Install one adjustable metal connectorthrough the third hole out from the center ofone servo arm, enlarge the hole in the servoarm using a 2mm drill bit to accommodate theservo connector. Remove the excess mate-rial from the arm.

After installing the adjustable metal con-nector apply a small drop of thin C/A tothe bottom nut. This will prevent the con-nector from loosening during flight.

Tie Wrap

Cut off excess

INSTALLING THE THROTTLE SERVO.


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Cut.

Secure.Throttle wire.

Cut.

Secure.

Throttle servo

Throttle servo

Pushrod choke

Throttle wire.

Pushrod choke

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PARTS REQUIRED

MAIN GEAR INSTALATION.

1) Assemble and mounting the wheel pantsas shown in the following pictures.

Pushrod choke

Throttle wire.

Secure.

Bottom side.

6x20mm

Secure.


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Repeat the process for the other wheel.

COWLING.

See picture below:

bottom side.

MOUNTING THE TAIL WHEELBRACKET.

See picture below:

3x15mm

3x12mm

Secure

Secure. 1. Slide the fiberglass cowl over the en-gine and line up the back edge of the cowl withthe marks you made on the fuselage.

Top side.

Bottom side.Bottom side

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3. Slide the cowl back over the engineand secure it in place using four wood screws.

2. While keeping the back edge of thecowl flush with the marks, align the front ofthe cowl with the crankshaft of the engine. Thefront of the cowl should be positioned so thecrankshaft is in nearly the middle of the cowlopening. Hold the cowl firmly in place usingpieces of masking tape.

4. Install the muffler and muffler extensiononto the engine and make the cutout in thecowl for muffler clearance. Connect the fueland pressure lines to the carburetor, mufflerand fuel filler valve.

3x15mm

Top side.

Drill a hole2mm diameter.

Secure.

Bottom side.

Trim and cut.

Drill a hole

10mm diameter

Left side.

center line 1.center

line 2

Mark point 1Mark point 2


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1. Install the rubber grommets and brasscollets into the elevator servo. Test fit theservo into the servo tray.

2. Mount the servo to the tray using themounting screws provided with your radiosystem.

INSTALLING THE ELEVATORSERVOS.

Install the spinner backplate, propeller andspinner cone. The spinner cone is held inplace using two 3mm x 8mm machine screws.

INSTALLING THE SPINNER.

Secure.

Elevator servo

Front view.

Secure.

Front view

Mark point

Drill a hole5.2mmdiameter

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Secure.

Left side.

HORIZONTAL STABILIZER.

Horizontal stabilizer installation See picture below.

Right side.

Top side

Elevator control horn install as same as theway of aileron control horn. Please see pic-tures below.

ELEVATOR CONTROL HORNINSTALLATION.

Elevatorcontrol horn.

Secure

4x12mm.

3 x 30 mm. 3x12 mm.

Secure


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Left side.

Elevator pushrod install as same as the wayof aileron pushrod.

ELEVATOR PUSHROD INSTALLATION.

Secure

4x12mm

Bottom side

290 mm.

Aluminium tube 12 mm.

Secure

Elevator pushrod.

170 mm.

M3

3x12mm

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Rudder servo install as same as method ofelevator servo.See picture below:

RUDDER SERVO INSTALLATION.

Elevator pushrod.

Elevator pushrod.Elevator pushrod.

Bottom side.

Rudder servo

Rudder servo

Rudder control horn install as same as theway of aileron control horn. Please see pic-tures below.

RUDDER CONTROL HORN INSTALLA-TION.

Drill a hole3.5mm

Control horn of Rudder.

3 x 40 mm

3 x 12mm

Secure

Rudder.

ControlRudder.

Aluminium


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Plastic parts of rudder cable

Cut

A+B EpoxyPLUS glue.

1. Rudder push - pull system install assame as picture below.

RUDDER CABLE INSTALLATION.

3 x 12mm

Secure

Secure.

Bottom side. Elevatorpushrod

Ruddercable.

Ruddercable.

Elevatorpushrod

Rudder cable

Cut

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C/A glue.

1. Cut out the switch hole using a modelingknife. Use a 2mm drill bit and drill out the twomounting holes through the fuselage side.

2. Secure the switch in place using thetwo machine screws provided with the radiosystem.

INSTALLING THE SWITCH.

Cut.

1. Plug the servo leads and the switchlead into the receiver. You may want to plugan aileron extension into the receiver to makeplugging in the aileron servo lead easierwhen you are installing the wing . Plug thebattery pack lead into the switch.2. Wrap the receiver and battery pack inthe protective foam to protect them from vi-bration. Use a rubber band or masking tape tohold the foam in place.

INSTALLING THE RECEIVER AND BATTERY.

Do not permanently secure the re-ceiver and battery until after balancing themodel.

3. Position the battery pack and receiverbehind the fuel tank. Use two tie wraps to holdthe battery and receiver securely in place aspictures below

Tie wrap.

Battery.

battery.Switch

Left side.

C/A glue.

Right side

Switch Receiver

Switch Engine.


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*** Test fit the aluminium tube dihedral braceinto each wing haft. The brace should slide ineasily. If not, use 220 grit sand around theedges and ends of the brace until it fits prop-erly.

Locate the aluminium wing dihedral brace.

815 mm

615 mm

25mm25mm

Right wing.

WING ATTACHMENT.

Secure.

2. Attach the aluminium tube into thefuselage.

3. Insert two wing panels as picturesbelow.

Secure.

Receiver

Left wing.

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C/A glue

See picture below:

A+B EpoxyPLUS glue

INSTALLING COCKPIT FUSELAGE .

A+B EpoxyPLUS glue


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With the wing attached to the fuselage, allparts of the model installed ( ready to fly), andempty fuel tanks, hold the model at themarked balance point with the stabilizer level.

*If possible, first attempt to balance the modelby changing the position of the receiverbattery and receiver. If you are unable to obtaingood balance by doing so, then it will benecessary to add weight to the nose or tail toachieve the proper balance point.

Lift the model. If the tail drops when youlift, the model is “tail heavy” and you must addweigh* to the nose. If the nose drops, it is “noseheavy” and you must add weight* to the tail tobalance.

Ailerons : 20 mm up 20 mm down

Elevator : 25 mm up 25 mm down

Rudder : 35 mm right 35 mm left

1. We highly recommend setting up a planeusing 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 surfacesmove in the correct directions.

20mm20mm

25mm

25mm

35mm35mm

CONTROL THROWS.

Accurately mark the balance point on the topof the wing on both sides of the fuselage. Thebalance point is located 152 mm back fromthe leading edge. This is the balance point atwhich your model should balance for your firstflights. Later, you may wish to experiment byshifting the balance up to 10mm forward orback to change the flying characteristics. Mov-ing the balance forward may improve thesmoothness and arrow- like tracking, but it maythen require more speed for take off and makeit more difficult to slow down for landing.Moving the balance aft makes the model moreagile with a lighter and snappier ”feel”. In anycase, please start at the location werecommend .

1. It is critical that your airplane be bal-anced correctly. Improper balance will causeyour plane to lose control and crash.THE CENTER OF GRAVITY IS LOCATED152mm BACK FROM THE LEADING EDGEOF THE WING.2. Mount the wing to the fuselage. Using acouple of pieces of masking tape, place themon the top side of the wing 152mm back fromthe leading edge, at the fuselage sides.

3. Turn the airplane upside down. Placeyour fingers on the masking tape and carefullylift the plane .

BALANCING.

Top side.

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1. Completely charge your transmitter andreceiver batteries before your first day of fly-ing.

2. Check every bolt and every glue joint inyour plane to ensure that everything is tightand well bonded.

3. Double check the balance of theairplane.

4. Check the control surface.

5. Check the receiver antenna . It shouldbe fully extended and not coiled up inside thefuselage.

6. Properly balance the propeller.

We wish you many safe and enjoyableflights with your YAK 55M

PRE-FLIGHT CHECK.

Instruction Manual book - Black Horse, Stepney n… · YAK 55M ARF is hand made from natural materials, every plane is unique and minor adjustments may have to be made. However, you

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