ccpm verses mechanical

[helidad]

I have a caliber 30 and it can be set up either mechanically or at 120 degrees ccpm. I do not have it set up yet and was wondering wich way would be better for a beginner?

[heli-cuzz]

I have a caliber 30 and it can be set up either mechanically or at 120 degrees ccpm. I do not have it set up yet and was wondering wich way would be better for a beginner?

The Caliber30 was my first heli. :D

The mccpm is easier to set-up than eccpm. I have the Caliber30 and Caliber50. I've been on eccpm since day one. I prefer the electrical mixing because you have three servos working together for one given input, thus giving you more torque per stick movement.
Both have faults, but I'd say the eccpm is the way to go. My opinion anyway. Some may like the mccpm better. You need a radio that is capable of supporting an electrical swash mixing. Either way, you have a great bird if you're just starting out.

[SAAB-o-matic]

I'll start the great debate. I have built a nexus and raptor 30 both with a mechincal setup. I found it a little easier to build from a beginner standpoint. Eccpm does allow you spread the workload between the servos but can be tricky to set up. Either one will give you good results.

[helidad]

Thank you for the information. I have a jr 9303 heli radio. According to the book I have all the mixes I need and then some. Out of all the articles i read everyone leans towards the eccpm.

[heli-cuzz]

Thank you for the information. I have a jr 9303 heli radio. According to the book I have all the mixes I need and then some. Out of all the articles i read everyone leans towards the eccpm.

I'll fly both, but I'll always set-up my helis in eccpm mixing. Once you figure out eccpm set-up, it becomes a breeze setting up another system. Here's my 50 sized 120degrees eccpm linkage system. Here's how simple the programming is for the Calibers. Its self-explanatory.

[mccd07]

On my CCPM I have ali - plus 60, ele - minus 60 and pitch -minus 35.

Someone set this up for me but what do the numbers mean?

Thanks,

Michael

[tdswan]

Those numbers are the amount of travel that the radio allows the 3 ccmp servos for pitch. Most of the time they are the same but depending on the geometry of the ccpm linkages, they could be different. To test how much these numbers need to be, you need to move the collective stick all the way up and down. If the swashplate stays level throughout the range, your numbers are fine being the same. If....say the swash at center is level but at all the way up and down is tilted forward and aft respectively, the elevator (pitch) number would need to be reduced and vice-versa if it were tilted the opposite way. It would mean that the linkage on the elevator servo has a little more "advantage" than the linkages on the left and right servo and the radio can then make up for it electronically.

[mccd07]

Great, thank you!

So the CCPM setting is travel. Why is this different then going into the travel setting screen?

The plus and minus must relate to which way the servo is facing correct?

Looking at the servo front to the top and the moving piece is at the top, moving to the right (clock wise) is positive and move left (counter clock wise) is negative. Is this correct?

[tdswan]

The CCPM setting is stricly for travel of the pitch or collective of the blades. The travel settings for aileron, elevator and aux 1 (pitch, or whatever your radio may call it) should be the same in your end-point adjust screen. Then you adjust the throws for L-R and F-R(cyclic) in your dual rate settings on the radio. Don't get the end-point adjustments mixed up with dual rates.

Your second question:
Yes, if you have a servo traveling in the wrong direction when you move the collective up and down, the CCPM menu where you adjust it. Change the corresponding number to the servo to a negative to reverse it's motion. As for knowing which direction a servo moves, it's up to what side of the servo the linkage is connected to. Some move one way, others move another. What really matters is that they all move the same and/or right way. You will have to go back and forth between the reversing menus and the CCPM mixing to get it right. As soon as you think you've got the pitch moving right, the aileron or elevator will be backwards. It will take some fumbling around.