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91SPEKTRUM DX6 • DX6 HELICOPTER PROGRAMMING GUIDE

CCPM SERVO CONNECTIONS

HOW 120 CCPM WORKS

120° Three-Servo CCPM relies on the radio’s special programming rather than a mechanical mixer to operate

the swashplate to achieve pitch and cyclic control. The radio’s 120° Three-Servo CCPM function automatically

mixes the three servos to provide the correct mixing inputs for aileron (roll), elevator (fore and aft pitch), and

collective pitch. The following is an example of how each control input affects the servo’s movement:

1. COLLECTIVE

When a collective pitch input is given, all three servos move simultaneously in the same direction, at equal

amounts, to raise and lower the swashplate while keeping the swashplate level. During this function, all three

servos travel in the same direction at the same value so

that the swashplate can remain level during the increase

and decrease in pitch. This mixing of the three servos is

achieved through the transmitter’s programming.

2. ELEVATOR (PITCH)

When an elevator input is given, all three servos must move

to tilt the swashplate fore and aft. Two servos (aileron and

pitch) move the swashplate in the same direction, while the

elevator servo moves in the opposite direction such that

the swashplate will tilt fore or aft. During this function, the

elevator servo travels at 100%, while the other two servos

travel at 50% (1/2 the travel value). This difference in travel is necessary due to the fact that the position of the

front control ball is two times the distance of the two rear control ball positions, as measured from the center of

the swashplate.

3. AILERON (ROLL)

When an aileron (roll) input is given, the aileron and pitch servos travel in opposite directions, while the

elevator servo remains motionless, tilting the swashplate right or left. The travel value for each of the two rear

servos is 100%.

IMPORTANT GYRO INFORMATION

Note: After flight trimming the helicopter, or anytime the rudder trim is changed, it is important

to rebind the system (see Binding page 60) to set the fail-safe position to the rudder’s true

neutral. With many types of gyros, each time the radio is turned on, the gyro senses the servo

output position and establishes this as the center for that flight.

When the DX6 receiver is ﬁrst turned on, the servos are driven to their fail-safe positions until the receiver

connects to the DX6 transmitter. This can take several seconds. If the fail-safe position for rudder is

different than the rudder trim position, it is possible that the gyro will establish the fail-safe position as

neutral instead of the trimmed neutral position. Making the rudder trim position and the fail-safe position

the same prevents this from happening. In summary, after the helicopter is trimmed, rebind the system to

prevent the tail from drifting.

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