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The JR 120° three Servo CCPM relies on the radio’s special CCPM
swashplate mixing rather than a conventional mechanical mixer
that is utilized to achieve the same results.
The radio’s 120° 3-servo CCPM function automatically mixes the
three servos to provide the correct mixing inputs for aileron
(roll), elevator (pitch) and collective. The following is an example
of how each control input affects the servo’s movement:
1. Collective
When a collective pitch input is given, all three servos (A, B, and
C) move together in the same direction, at equal amounts, to
raise and lower the swashplate while keeping the swashplate
level. During this function, all three servos travel at the same
value (100%) so that the swashplate can remain level during the
increase and decrease in pitch. As mentioned, this mixing of the
three servos is achieved through the radio’s CCPM program.
2. Elevator (pitch)
When an elevator input is given, all three servos must move to tilt
the swashplate fore and aft, but their directions vary. The two rear
servos (B and C) move together in the same direction, while the
front servo (A) moves in the opposite direction. For example,
when an up elevator (back cyclic) command is given, the two rear
servos (B and C) will move downward, while the front servo (A)
moves upward so that the swashplate will tilt aft. During this
function, the front servo (A) travels at 100%, while the two rear
servos (B and C) travel at 50% (1/2 the travel value) of the front
servo. This difference in travel is necessary due to the fact that the
position of the front control ball is two times the distance of the
two rear control ball position as measured from the center of the
swashplate. As mentioned, this mixing of the three servos is also
achieved through the radio’s CCPM program.
3. Aileron (roll)
When an aileron (roll) input is given, the two rear servos (B and C)
travel in opposite directions, while the front servo (A) remains
motionless. For example, when a left aileron (roll) command is
given, the left rear servo (C) will move downward, while the right
rear servo (B) will move upward to tilt the swashplate to the left.
As mentioned, the front servo (A) will remain motionless. The
travel value for each of the two rear servos is 100%.
Please refer to the diagram at right for clarification.
HOW JR 120 CCPM WORKS
Front of Helicopter
Elevator Axis
JR 120° CCPM Control System
6-channel or greater R/C helicopter system with 120° CCPM function (see list below)
5 Servos
1000mAh receiver battery
Gyro
CCPM-Ready JR Radio Systems
Most current JR heli radio systems
(XP652, XP8103 w/digital trims, 10X,
as well as older 10 series systems) are
equipped with 120° CCPM electronics
for use with the Robinson R22 SS
CCPM machines. Radios you may be
flying now, like the X347, X388S,
XP783, and XP8103*, have CCPM
capability built in but require activation
by the Horizon Service Department.
Please call (217) 355-9511
for details.
*Please note that many XP8103 systems have the CCPM
function already activated. Please check with the Horizon
Service Center for details.
CURRENT RADIO SYSTEMS
JRP1656** PCM 10X, 5-8231 Servos (50/53/72 MHz)
JRP165TX
PCM 10X, Transmitter Only (50/53/72 MHz)
JRP8622** XP8103FM, 5-517 Servos (50/53/72 MHz)
JRP8653** XP8103PCM, 5-531 Servos (50/53/72 MHz)
JRP6622** XP652 FM, 5-517 Servos (50/53/72 MHz)
XP652
10X
XP8103 DT
RADIO SYSTEM REQUIREMENTS (NOT INCLUDED)
JRP9012.46 Robinson R22 Manual 10/6/00 5:06 PM Page 45
