CCPM/MPM What is the difference

[rotorwrecker]

Hi all.My heli has a setup choice of ccpm or mpm.Apart from the physical setup difference how do they differ to fly.

Dave.

[David Drew]

Do you mean CCPM & CPM or is MPM a new one??

[rotorwrecker]

Hi.the book definatly says mpm (mechanical pitch mixing) but does not tell me the effects of each.

[David Drew]

OK, that's a new one for me. Experts will now pile in and explain.

Cheers

[Brian Gifford]

What heli is it?

[Andy from Sandy]

What will follow may well be a friendly heated exchange about what each means to each person.

My understanding is that MPM is the use of a single servo to actuate a single function. So you have one servo for collective, one for aileron and one for elevator. This is the setup on a TT Raptor.

With CCPM you have all 3 servos working together with clever mixing supplied by the TX to make the servos move correctly to provide collective, aileron and elevator functions. Like the T-Rex 600

In the scheme of things MPM is actually the most accurate as there will be no interaction in the system. CCPM is prone to interaction especially when used with a 120degree swash setup as not all servos are matched for speed and travel. This manifests itself in the swash wobbling as it moves up and down or when giving just elevator input the swash moves up and down a little as well.

[electricsceadu]

i have a mix of both and still prefer the way mechanical mixing flies over eccpm

[Andy from Sandy]

I should also add MPM or as Hirobo calls it HPM is the setup found on the Hirobo Sceadu. Hirobo also does a CCPM Sceadu that they callSWM. The new Hirobo SDX is also a CCPM machine that Hirobo describe as SWM.

[electricsceadu]

don't forget andy that some of the latest sdx kits are hpm using the sceadu servo mount
although the hpm kit wasn't released when i bought mine

[Andy from Sandy]

Although available I don't think we are going to see it as Align has brainwashed everyone into having CCPM. lol.

[electricsceadu]

align have brainwashed many into thinking how you should do a lot of things in the hobby
but the odd one can see beyond the great marketing from align

its just a matter of time untill the current trend passes and then we shall see what the next new kid on the block brings along

[rotorwrecker]

Hi.Great rsponses.The heli is an RJX Hurrican 50 (jr airskipper 50) and does have the 120 degree swash and is currently on ccpm setup.I think i might now change the setup to mpm as thats the system i had on my Vr concept 46,Rappy 30v2,Nexus 30ss, and the radio setup seems more complex for ccpm but have setup my radios and mates on mpm easily and it all seems more complicated than it needs to be with ccpm.

Dave.