120/140 3-SERVO CCPM SWASHPLATE MIXING
The JR® 120°/140° CCPM or Cyclic/Collective Pitch Mixing system offers the user a control system that can
accomplish the same control inputs as a 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° or 140° from each other, hence the 120°/140° 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.
The main difference in the way that these two systems operate is that unlike the one servo system where the
three servos work completely independently 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 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 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 preprogrammed
into many of today’s popular radio systems. Since the 120° and 140° 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 systems.
For JR radio owners, please refer to the radio information contained at the front of this manual or on the
following pages to determine if your radio system has the CCPM function. For other brands of radio systems,
please contact the radio manufacturer for CCPM information. Please note that it is not possible to program a
non-CCPM radio system for CCPM operation.
understAndIng ccPm control systems
41
