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XHELI.COM . Autography FlightPower . Advantage Hobby

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e-Electric General Discussion > ccpm, can anyone explain?
 
 
flightss
Senior Heliman
Location: franklin,nc

can anyone explain ccpm and if i need special setup
06-07-2003 Over year old.
 
 
Mike99
Veteran
Location: Canal Winchester, OH

You've got to tell us more about your heli, radio etc.... just model types is OK.

Mike99
06-07-2003 Over year old.
HOMEPAGE  
 
 
AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

CCPM stands for Cyclic Colective Prich Mixing. This setup is usually implemented with 3 servos driving the swash plate directly. In combination, these servos position the swash elevation and tilt to give the blades the commanded pitch angles. This eliminates a lot of links and bellcranks and, therefore, a lot of slop in the control links.

No, you don't NEED this but it seems to be popular in Europe and catching on here in the US. If you want to use CCPM then you need a transmitter capable of this type of operation.

Wolfgang
06-07-2003 Over year old.
HOMEPAGE  
 
 
flightss
Senior Heliman
Location: franklin,nc

ccpm?

ec8 and futaba 6xh
06-07-2003 Over year old.
 
 
flightss
Senior Heliman
Location: franklin,nc

ccpm?

has 120 and 90 ccpm swash
06-07-2003 Over year old.
 
 
Eddi E. aus G.
Senior Heliman
Location: Gerlingen. Germany.

120 means 3 servos with their links every 120° -- with VARIO it's one to the aft, one to port, one to starboard side.

90 means 3 (or 4) servos with their links every 90°, usually one front or aft (or both), one to port, one to starboard.

90 with 4 servos is safer than 120 since one servo can possibly die (if it's not blocked) and the others can still move the swashplate (and the dead servo) for an emergency landing.

Servos should be strong and sturdy since the full load and vibrations go directly on them (not lessened by some mechanical setup).

Born to fly. Forced to work.
06-08-2003 Over year old.
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inventory
Senior Heliman
Location: CA

I thought 90 degree eccpm has a lot of interaction? Most people seem to use 120 or 140......
06-08-2003 Over year old.
 
 
Eddi E. aus G.
Senior Heliman
Location: Gerlingen. Germany.

90 with 3 or 4 servos has interactions, 120 with 3 also.
When 90/4 is not setup properly, you may notice the servos working one against another causing them to strain the rx battery and their electronics and gearing.
With 120 the servos don't fight each other, but you'll maybe notice some strange behaviour of your ship.
You will have to "equalize" your servos for proper setup, which means you'll have to adjust for all servos to have (almost) exactly the same travel, center position etc. Also, the servos should be of the same speed (even servos of one type may differ).
Otherwise, if you apply collective and the servos all take their own time to get to their desired position (which is maybe not even roughly the same) the heli will also get an unintended cyclic input and move anywhere but straight up. Or if you move from back cyclic to forward cyclic there may be an unintended amount of up or down collective involved, or some left/right cyclic ... you'll see.
When applying small or slow stick inputs, you may not even notice it, but when applying all-the-way inputs, you can even see it watching your swashplate.

Born to fly. Forced to work.
06-08-2003 Over year old.
HOMEPAGE  
 
 
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e-Electric General Discussion > ccpm, can anyone explain?
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