Specifications

ing. If the servo is reaching the mechanical limit of movement and emitting a buzzing sound,
then it is binding. You will need to fix this binding because the servo will draw a large amount
of power when it is binding, which can overload the BEC and the BEC may shut down. This will
cause a loss of heli control and probably a crash.
If you are using a transmitter with swashplate support, then you will need to enter the swash-
plate mixing menu and reduce the aileron and elevator mixing to eliminate the servo binding.
Ensure the aileron and elevator mixing is equal after reducing the mixing values.
If you are using a transmitter without swashplate support, then you will need to reduce the for/
aft and left/right servo endpoints to eliminate the servo binding. Be sure the servo travel is the
same after reducing the values.
13.2.6. Transmitter exponential setup for cyclic
The transmitter expo function can be used to decrease cyclic sensitivity when the cyclic stick is
near the center (without decreasing total servo travel). This will allow you to make smaller cyc-
lic corrections and avoid "overcontrolling" the helicopter.
For Futaba/Hitec transmitters, a negative value decreases cyclic sensitivity. A value of -20 to -
40 is recommended.
For JR/Graupner/Multiplex/Airtronics/Sanwa transmitters, a positive value will decrease cyclic
sensitivity. A value of 20 to 40 is recommended.
Note
If you increase the collective pitch range, you will need to add more expo to retain
the same effect.
13.3. Main rotor setup - part 1
13.3.1. Main rotor blade balancing using the KSJ-528 blade balancer
It is important to balance the main rotor blades because this reduces vibration. Reduced vibra-
tion will make hovering easier, increase the flight time because less power will be wasted, and
will reduce gyro drift and allow the gyro to function more efficiently.
There are multiple ways to balance the blades, but this method works best for me so far. It
minimizes the amount of tape used and we avoid disrupting the airflow where the blades gen-
erate the most lift by putting most of the tape near the bolt holes and the CG.
Be sure to use ELECTRICAL tape to balance the blades. Regular transparent tape is not
heavy enough. Electrical tape weighs about 0.1 gram per 2.5cm (1 inch).
13.3.1.1. Step one: Matching the CG
1. Remove the blade holder posts from the balancing tray of the KSJ-528.
2. Make sure the balancing tray balances evenly when nothing is on the tray. If necessary,
use the setscrews to balance the tray.
3. Place one blade in the KSJ-528 tray and delicately shift the blade left or right across the
balancing tray until the blade balances.
Helicopter and Transmitter Setup
102