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HelicopterMain Discussion › CCPM - what is it and what's the alternative?
08-08-2007 11:48 PM  10 years agoPost 1
darkfa8

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Brick, NJ - USA

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CCPM - what is it and what's the alternative?

I'm curious to know the correct answer to this question.

- Dan Goldstein
Team Revolectrix

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08-09-2007 12:02 AM  10 years agoPost 2
rcadd1ct

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Richardson, Texas

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Cyclic Collective Pitch Mixing.

The other is standard or single servo. ie one servo does one function. One does pitch. One does fore/aft cyclic and the remaining one does the other cyclic.

CCPM has all the servos working together.

-RCA .......... Making Cuisinarts Fly!!!!!!!

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08-09-2007 12:08 AM  10 years agoPost 3
MJWS

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Airdrie, AB - Canada

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Here's a little fuel for a fire that is only 10,000 threads and posts old. C'mon in zealots from all sides the water is fine.

http://www.iroquois.free-online.co.uk/ccpm.htm
More and more recently introduced machines are using some form of moving swashplate system incorporating Cyclic/Collective Pitch Mixing (CCPM). They can take many forms and the essential mixing can be accomplished mechanically, electronically, or by a mixture of both.
Here's another fun one:
Mechanical or electronic?

There are many ways of operating a moving swashplate via the three radio functions involved - aileron, elevator and pitch. Until recently all of these were entirely mechanical, with any mixing being performed by means of some form of mechanical mixer. The advent of increasingly complex radio equipment with various mixing circuits incorporated in the transmitter has made some of the existing systems simpler and also paved the way for more complex systems. For example, the 120 degree swashplate systems described above would be virtually impossible to achieve mechanically. It has also made the adjustment of such systems much simpler.
Have fun,

Mike

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08-09-2007 12:16 AM  10 years agoPost 4
jackheli

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Vancouver - Canada

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The other is standard or single servo mix. Mechanical mix. ie one servo does one function. One does pitch. One does fore/aft cyclic and the remaining one does the other cyclic.

CCPM has all the servos working together.
Sorry mate, not exactly accurate...

CCPM means the swasplate moves up and down on the mast in order to change collective pitch. So you could have mechanical CCPM, or mCCPM, where one servo moves the swashplate up and down for collective and another two tilt it for cyclic (like the Century Hawk or the TT Raptor) or an electronic CCPM, or eCCPM, where all three servos work together to raise and lower the swashplate based on a mixing feature at the transmitter.

The alternative, for example, would be to have a fixed swashplate on a hollow mast with a rod moving inside, which would be mechanically mixed to the two blades grips. So by moving the rod up and down you would increase/decrease collective (for example the now extinct Schlutter Heliboy )

All modern collective pitch model helicopters are CCPM in one way or another, so there is really no alternative.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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08-09-2007 02:06 AM  10 years agoPost 5
rcadd1ct

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Richardson, Texas

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Edited my edit before I proof read my edit.

-RCA .......... Making Cuisinarts Fly!!!!!!!

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08-09-2007 04:48 AM  10 years agoPost 6
Al Austria

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Gainesville, FL

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I miss the time when you were either just CCPM or you were not. IMHO, when someone says CCPM(not eCCPM), the majority of people will think of a 120 degree swashplate and electronic mixing, PERIOD.

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08-09-2007 07:42 AM  10 years agoPost 7
w.pasman

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Netherlands

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Yes as jackheli says.

You could also have a fixed pitch heli, and just change the rotor RPM to change the pull force of the rotor. And if desparate to get a fixed pitch machine you can always remove the pitch servo on a mCCPM machine.

I have not seen any alternative to a swash plate yet.

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08-09-2007 02:03 PM  10 years agoPost 8
reddragon

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Brooklyn, N.Y.

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I miss the time when you were either just CCPM or you were not. IMHO, when someone says CCPM(not eCCPM), the majority of people will think of a 120 degree swashplate and electronic mixing, PERIOD.
Al I couldn't have said it better. Bless you.

Wayne - Fly it like you stole it! You're in good hands with Runryder!

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08-09-2007 02:23 PM  10 years agoPost 9
hootowl

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Garnet Valley, Pa.

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All of the helicopters we typically fly mix collective with cyclic to control the rotor head so the all are Cyclic Collective Pitch Mixing (CCPM)

eCCPM typically uses a three point (120deg) swash with each "point" or link connected to a servo. All three servos work in unison, controlled by the programming of the radio. Collective pitch and cyclic (elevator and aileron) are controlled in unison by software.

mCCPM typically uses a pitch arm but there are many other versions. The mixing happens mechanically.. hence the "m". Usually the mechanical mixing is accomplished by having the cyclic servo "ride" on the pitch arm.

Wolves don't lose sleep over the opinions of sheep

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08-09-2007 02:39 PM  10 years agoPost 10
darkfa8

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Brick, NJ - USA

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so is Dave Day's explanation incorrect:

http://www.helihobby.com/html/colle...h_and_ccpm.html

- Dan Goldstein
Team Revolectrix

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08-09-2007 02:52 PM  10 years agoPost 11
hootowl

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Garnet Valley, Pa.

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For all practical purposes, CCPM means 'moving swashplate'.
No it is correct

Wolves don't lose sleep over the opinions of sheep

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08-09-2007 03:09 PM  10 years agoPost 12
BarracudaHockey

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Jacksonville FL

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Whats the matter, didn't want to take my word for it?

Andy
AMA 77227
http://www.jaxrc.com

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08-09-2007 03:10 PM  10 years agoPost 13
hootowl

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Garnet Valley, Pa.

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I think the steam is out of this argument already

Wolves don't lose sleep over the opinions of sheep

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08-09-2007 04:39 PM  10 years agoPost 14
MJWS

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Airdrie, AB - Canada

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Yep. Amazing. Thought we'd be at page 10 by now. Where's Terry when you need him? Here are a couple threads with good debate:

http://www.runryder.com/helicopter/t264389p1/
http://www.runryder.com/helicopter/t339814p1

Mike

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HelicopterMain Discussion › CCPM - what is it and what's the alternative?
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