JR Direct Radio XP662 User Manual download pdf (Page 82)

XP662 MANUAL Helicopter

HOW 120 CCPM WORKS (continued)

7.13

CHAPTER 7: FUNCTIONS (FUNCTION MODE)

•

Helicopter

The JR 120° CCPM or Cyclic/Collective Pitch Mixing

system offers the user a control system that can

accomplish the same control inputs as the One-Servo

Standard system, but with increased precision and

reduced complexity.

As with the One-Servo system, the JR CCPM system

utilizes three servos for the three main controls:

aileron (roll), elevator (pitch) and collective. The

CCPM lower swashplate ring is designed with only

three control balls, spaced at 120° from each other,

hence the 120° CCPM designation. Although the

control balls are not at 90° as in the standard system,

the aileron (roll) axis is still parallel to the main

mechanics of the helicopter, and the elevator (pitch)

axis still functions at 90° to the mechanics as does

the One-Servo System. Please refer to the diagram

below for clarification.

The main and important difference in the way that

these two systems operate is that unlike the One-

Servo system where the three servos work completely

independent from each other, the CCPM systems work

as a team to achieve the same control inputs. For

example, if an aileron (roll) input is given, two servos

work together to move the swashplate left and right. If

an elevator (pitch) input is given, all three servos work

together to move the swashplate fore and aft. For

collective, it’s also the strength of three servos that

will move the swashplate up and down the main rotor

shaft. With two to three servos working at the same

time during any given control input, servo torque is

maximized and servo centering is also increased. In

addition to these benefits, CCPM achieves these

control responses without the need for complex

mechanical mixing systems that require many more

control rods and parts to set up.

This amazing CCPM control is achieved through

special CCPM Swashplate Mixing that is pre-programmed

into many of today’s popular radio systems.

Since the 120° CCPM function is pre-programmed,

CCPM is no more complicated to set up than a

conventional One-Servo Standard system. When you

factor in the reduced parts count and easy

programming, CCPM is actually easier to set up and

operate than many conventional systems.

Elevator Axis

120°

120° Three-Servo CCPM Control System

Aileron Axis

120 Three-Servo CCPM Swashplate Mixing

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JR Direct Radio XP662 User Manual Page 82

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