120 verses 90 CCPM?

[Bzooka]

Could somebody explain to me what the benefits are of 120 CCPM verses 90? Thanks

[whtmex]

A 90 setup isn't technically CCPM. A 90* setup allows you to fly a heli without having a CCPM capable Transmitter.

A 120* CCPM setup has 3 servos that work in conjunction with each other to apply the collective/cyclic inputs on the main rotor. In other words...when you move the throttle/collective up, all three servos put in input equally to raise the swashplate to increase blade pitch. For left roll, the left servo would pull the swashplate down, while the right servo would push the swashplate up. This setup can only work with a CCPM transmitter that can correctly calculate and transmit the proper level of mixing as each servo is still assigned a specific channel. Since you're using multiple servos on each movement, controls tend to be a bit crisper and smoother.

A 90* setup uses one servo to control each function independently, and usually has some type of mechanical mixing setup (levers & bellcranks) onboard the heli. One control movement on the transmitter will move one servo only.

Hope this explains a bit.

I've flown both, and think the 120 CCPM gives you a much smoother ride. In fact I just recently converted my T-Rex 450XL HDE (90 deg setup) over to the 450SE frame so I could fly it on the CCPM setup.

[Bzooka]

Thanks for the in depth explanation.