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3. Turn the airplane upside down. Place your fingers 

on the masking tape and carefully lift the plane.

4.    If  the  nose  of  the  plane  falls,  the  plane  is  nose 

heavy. To  correct  this  first  move  the  battery  pack 

further back in the fuselage. If this is not possible 

or does not correct it, stick small amounts of lead 

weight  on  the  fuselage  under  the  horizontal 

stabilizer. If the tail of the plane falls, the plane is 

tail  heavy.  To  correct  this,  move  the  battery  and 

receiver  forward  or  if  this  is  not  possible,  stick 

weight  into  the  firewall.  When  balanced  correctly, 

the airplane should sit level or slightly nose down 

when you lift it up with your fingers. 

BALANCING

1. It is critical that your airplane be balanced correctly. 

Improper  balance  will  cause  your  plane  to  lose 

control and crash.

   THE  CENTER  OF  GRAVITY  IS  LOCATED  137mm 

(5.3  in)    BACK  FROM THE  LEADING  EDGE  OF 

THE  WING,  AT  THE  FUSELAGE.  BALANCE  A 

PLANE  UPSIDE  DOWN  WITH  THE  FUEL  TANK 

EMPTY.

2.  Mount the wing to the fuselage. Using a couple of 

pieces  of  masking  tape,  place  them  on  the  top 

side  of  the  wing  137mm  (5.3  in)  back  from  the 

leading edge, at the fuselage sides.

YAK54  MK2

Instruction Manual

20

CONTROL THROWS

1. We highly recommend setting up a plane using 

the control throws listed.

2.  The control throws should be measured at the 

widest point of each control surface.

3.  Check to be sure the control surfaces move in 

the correct directions.

!

LATERAL BALANCE

       

After  you  have  balanced  a  plane  on  the  C.G. 

You  should  laterally  balance  it.  Doing  this  will 

help the airplane track straighter.

1. Turn the airplane upside down. Attach one loop 

of  heavy  string  to  the  engine  crankshaft  and 

one to the tail wheel wire. With the wings level, 

carefully lift the airplane by the string. This may 

require two people to make it easier.

2.  If one side of the wing fall, that side is heavier 

than the opposite. Add small amounts of lead 

weight  to  the  bottom  side  of  the  lighter  wing 

half's  wing  tip.  Follow  this  procedure  until  the 

wing stays level when you lift the airplane.

Aileron     11mm up 

11mm down

Elevator     11mm up 

11mm down

Rudder     35mm right 

35mm left

Low rate:

137mm 

(5.3 in)

Summary of Contents for YAK54 MK2

Page 1: ...mount 21mm x 42 mm Propeller suit with your engine Engine 120 2 stroke or 120 4 stroke glow engine or 20cc gas engine not included Motor brushless outrunner 2000 2400 W 450 KV not included Gravity CG...

Page 2: ...er and acetone Do not let these chemicals come in contact with the colors on the covering and the plastic parts SAFETY PRECAUTION This is not a toy Be sure that no other flyers are using your radio fr...

Page 3: ...e the masking tape and the servo lead from the thread 5 Repeat step 2 5 to install the second aileron servo in the opposite wing half Make certain the hinges are adequately secured with glue If they c...

Page 4: ...nut against and then install the metal M3 clevis to the other side of the pushrod wire 3 Plug the aileron servo into the receiver and center the servo Install the servo arm onto the servo The servo a...

Page 5: ...e Wing To The Fuselage Attach the wings to the fuselage and secure the wing panels using 4 plastic screw Cut off shaded portion Assemble left and right sides the same way Aileron Aileron Neutral Ailer...

Page 6: ...off shaded portion 4mm Washer 5mm Washer 4mm Spring Washer 4 x 20mm Cap Screw 4 YAK54 MK2 Instruction Manual 5 Apply threadlocker screw cement Main Gear R Main Gear L Collar Collar Washer Washer Nut N...

Page 7: ...rrectly mix up a generous amount of 30 minute epoxy Apply a thin layer to the bottom and to the top of the stabilizer mounting area and to the stabilizer mounting platform sides in the fuselage Insert...

Page 8: ...der YAK54 MK2 Instruction Manual 7 Align the center line of horizontal tail with elevator Cut away film only here Secure nylon hinges with instant glue being careful tail wing and elevator Make certai...

Page 9: ...lide a crimp onto the cable then pass the cable through the threaded cable end Pass the cable back into the crimp and use crimping pliers to secure the crimp to the cable Guide the cable into the fuse...

Page 10: ...able rod INSTALLING THE ELEVATOR SERVO 1 Remove the covering from both size of the fuselage 2 Install two servo to the fuselage as shown 3 Repeat these step as installing the aileron control horn INST...

Page 11: ...Must be purchased separately Cut off shaded portion Pay close attention here YAK54 MK2 Instruction Manual 10 Apply threadlocker screw cement Elevator rod 3x12mm Aluminum ball...

Page 12: ...portion YAK54 MK2 Instruction Manual 11 INSTALLING THE Tail wheel 3 x 12mm TP Screw 3 x 15mm Cap Screw 2 2 2 2 3mm Spring Washer Spring Must be purchased separately 3x12mm Top Hatch Silicone Silicone...

Page 13: ...INSTALLING THE ENGINE MOUNT Apply threadlocker screw cement 4 x 30mm Screw 4mm Washer 4mm Spring Washer 4x30mm 4x30mm 4mm 4mm 4mm 4mm Engine Mount YAK54 MK2 Instruction Manual 12 3x15mm Spring...

Page 14: ...Fuel Tank YAK54 MK2 Instruction Manual 13 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 t...

Page 15: ...into the throttle arm of the engine when the engine is fitted onto the engine mount Fit the engine to the engine mount using the screws provided Must be purchased separately Nut 4x30mm Screw 4mm 4 8...

Page 16: ...screw INSTALLING THE THROTTLE 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 accommodat...

Page 17: ...of the engine The front of the cowl should be positioned so the crankshaft is in the middle of the precut opening Hold the cowl firmly in place using several pieces of masking tape Enlarging the hole...

Page 18: ...opeller and spinner cone The spinner cone is held in place using two screws The propeller should not touch any part of the spinner cone If it dose use a sharp modeling knife and carefully trim away th...

Page 19: ...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...

Page 20: ...19 White glue Check the motor rotation When rotating clock wise charge the connection of 2 wires Velcro Battery Cord 4x70mm 4x70mm 4mm 4mm 4mm 4mm Electric Speed Controller Open and Close Top Hatch Ba...

Page 21: ...g to the fuselage Using a couple of pieces of masking tape place them on the top side of the wing 137mm 5 3 in back from the leading edge at the fuselage sides YAK54 MK2 Instruction Manual 20 CONTROL...

Page 22: ...Aileron Aileron Rudder Servo YAK54 MK2 Instruction Manual 21 Elevator Control Aileron Control 11mm 11mm Rudder Control 35mm 35mm 11mm 11mm FLIGHT PREPARATION PRE FLIGHT CHECK 1 Completely charge your...

Page 23: ...22 Main Gear Dimensional Detail TAIL Gear Dimensional Detail 13 0 30 0 270 1 19 0 49 1 25 0 9 0 3 2 16 0 137 7 49 2 25 0 17 0 24 0 167 7 205 7 40 0 13 0 17 0 24 0 4 0 12 0 YAK54 MK2 Instruction Manual...

Page 24: ...23 EXPLODED VIEW 3mm 3mm 3mm 3x10mm TP 2mm 2mm 2x10mm 4x4mm 3x25mm 4x30mm 4x30mm 4x30mm 4mm 4mm 4mm 4mm 4x70mm 4mm 4mm 3x15mm 3x12mm 3mm 4x20mm 3x12mm 3x25mm 3x25mm 3x20mm 3x20mm 3mm 3mm...

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