Understanding The Ccpm Control Systems - JR Vibe 90SG Assembly Instructions Manual

understAndIng ccPm control systems
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.
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