JR Direct Radio XP662 User Manual download pdf (Page 81)

XP662 MANUAL Helicopter

HOW 120 CCPM WORKS

7.13

CHAPTER 7: FUNCTIONS (FUNCTION MODE)

•

Helicopter

As mentioned previously, 120° Three-Servo CCPM

relies on the radio’s special CCPM swashplate mixing,

rather than a conventional mechanical mixer that is

utilized to achieve the same results.

The radio’s 120° Three-Servo CCPM function

automatically mixes the three servos to provide the

correct mixing inputs for aileron (roll), elevator

(pitch), and collective. 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 (A, B, and C) move together 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 at the

same value (100%) so that the swashplate can

remain level during the increase and decrease in

pitch. As mentioned, this mixing of the three servos

is achieved through the radio’s CCPM program.

2. Elevator (Pitch)

When an elevator input is given, all three servos

must move to tilt the swashplate fore and aft, but

their directions vary. The two rear servos (B and C)

move together in the same direction, while the

front servo (A) moves in the opposite direction. For

example, when an up elevator (back cyclic)

command is given, the two rear servos (B and C)

will move downward, while the front servo (A)

moves upward so that the swashplate will tilt aft.

During this function, the front servo (A) travels at

100%, while the two rear servos (B and C) travel at

50% (1/2 the travel value) of the front servo. 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 position as

measured from the center of the swashplate. As

mentioned, this mixing of the three servos is also

achieved through the radio’s CCPM program.

3. Aileron (Roll)

When an aileron (roll) input is given, the two rear

servos (B and C) travel in opposite directions, while

the front servo (A) remains motionless. For

example, when a left aileron (roll) command is

given, the left rear servo (C) will move downward,

while the right rear servo (B) will move upward to

tilt the swashplate to the left. As mentioned, the

front servo (A) will remain motionless. The travel

value for each of the two rear servos is 100%.

Please refer to the diagram below for clarification.

Front of Helicopter

Elevator Axis

120° CCPM Control System

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 87 88

Comments to this Manuals

No comments

JR Direct Radio XP662 User Manual Page 81

Comments to this Manuals