9
SWASHPLATE CONTROL SYSTEMS
3 - SERVO CCPM SWASHPLATE MIXING
The 120 CCPM or Cyclic/Collective Pitch Mixing system offers the user a control system that accomplish the
same control inputs as the one servo standard system, but with increased precision and reduced complexity.
With the one servo system, CCPM system utilizes three servos for the three main controls : Aileron , elevator,
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 axis is still parallel to the main mechanics of the helicopter. and the elevator axis still
functions at 90 to the mechanics as does the one servo system. Please refer to the diagram below for
clarification.
The main 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 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 or 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 response without the need for complex mechnical mixing systems that require many
more control rods and parts to setup.
Pitch Axis
Elevator Axis
Aileron Axis
120 3 servo CCPM
Control System
The CCPM control is achieved through special CCPM swashplate
mixing that is preprogrammed into many of today's popular radio
systems. Since the 120 CCPM function is preprogrammed, 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
system.
Please refer to the radio information on the following page to determine
if your radio system has the CCPM function. For the radio not poviding
the CCPM program function, please contact the radio manufacturer for
CCPM information.
o
o
o
o
o
o
o