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Old 11-14-2002, 03:03 PM   #1
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CCPM Mechanics

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Hi Folks;

What do you think about CCPM Mechanics?

Like, Dislike, 3 servos, 4 servos...

Personnaly I have a 3 servos 120degrees
JR Ergo50 TypeII CCPM - Robinson R22
and I love it, super smooth and no bad habit.

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Old 11-14-2002, 04:02 PM   #2
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I'm actually about to try CCPM for the first time in my MS Hornet CP.
Looks pretty good so far. I'll keep you posted.

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Old 11-14-2002, 06:44 PM   #3
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To be totally accurate your question is about ECCPM. There are two type of CCPM. Any time the swash plate moves for collective you require a mixing system to separate cyclic pitch from collective pitch. Thus the name CCPM. This can be done two ways, mechanically or electronically.

I like the simplicity of ECCPM, however, it requires much more careful setup and there are always interactions between controls that you need to mix out. Fast elevator movements cause a collective bounce but you rarely move the sticks fast enough to notice. 140 degree ECCPM takes care of this. Accurately matched precision servos are almost a must. You do not nee digitals but good quality servos are required. I used to be totally against ECCPM until I won a Fury. Now with over 400 flights with this machine I can say that for general sport flying CCPM is fine as long as it is set up properly which can be hard for a rank beginner.

For contest flying, however, I much prefer mechanical CCPM. You do not get any mixing problems which makes it much easier to set up two machines to fly the same. I also find them much more stable in the hover. With ECCPM I find it hard to get the heli to fly hands off from flight to flight. I seem to always have to add a little trim before each flight. If you have ever flown a top quality mechanical CCPM machine such as TSK or and Excel Pro you would be amazed at how much more stable they are. They track like pattern aircraft.

As for 3 vs 4 servo I much prefer 3 servo. 4 servo is great in theory and would work awesome if you had linear travel servos. However, we rely on the rotational movement on servo arms. With our servos you get different travel of the of each servo at different rotation angles of the servo wheel. Because of this you end up with the servos fighting each other. If you set all you links at 90 degrees at neutral and give a collective command everything works fine. But now if you throw in a cyclic command and collective at the same time the cyclic servos will not give the same movement to the collective command. This causes them to fight each other. The longer the servo arms the less this effect has but it is still there. For this reason I prefer 120 ECCPM.

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