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IMPORTANT CCPM PROGRAMMING DOS AND DON’TS
It is extremely important that the travel adjustment values for the three CCPM servos (aileron, elevator, Aux 1) be initially set to
exactly the same travel value. If the travel value is not similar for each servo, it will create unwanted pitching and rolling of the
swashplate during collective pitch inputs. The travel values for each servo will be adjusted in Step 7.8 and Step 7.9 to remove any
minor pitch and roll coupling during pitch, roll, and collective movements.
Minor travel value adjustments are necessary due to slight variations in servo travel and centering. Although the three servos may
appear to travel at the same amounts in each direction, in reality the servos can vary slightly. This variation is more common in analog
type servos. If JR’s new digital servos are used, the travel adjustment values will generally not need to be altered.
A. TRAVEL ADJUST
It is also extremely important that the servo reversing directions for the three CCPM servos (aileron, elevator, Aux 1) be set as
indicated in the upcoming radio programming steps. If one or more servos is not set to the correct direction, the CCPM function will
be out of synchronization, and the three control functions (Aileron, Elevator, Collective) will not move properly. In the event that a
control surface is working in the wrong direction, the control function can only be reversed by changing the desired CCPM value for
that function from a (+) to a (-) value or vise versa.
Example: If when you increase the collective pitch, the pitch of the main blades actually decreases, it will be necessary to access the
CCPM function and change the travel value for this function from (+) to (-), or (-) to (+). This will reverse the direction of the
collective pitch function without affecting the movement of the aileron and elevator functions.
B. SERVO REVERSING
[SWASH TYPE]
3SERVOS(120
•
)
EXP AILE ELEV PITCH
[NH +48% +52% +60%
ENTER
SEL ACT + –
CL
+ –
CL
+ –
CL
To reverse the direction of a CCPM control
function, it’s neccessary to change the value
from (+) to (–) or (–) to (+) as needed.
10 Series Systems
[SWASH MIX]
3servos
120
•
AILE +48%
ELEV +52%
∞ PIT. +60%
8103 Systems
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