I have a caliber 30. When I hover or fly forward or when climbing out it is smooth as glass. When I decend from 100 feet or so, sometimes the heli starts to shake, to make it stop, I just add power and decend at a differnt speed. I adjusted my pitch and throttle curves so as not to fly in the rpm and pitch range where the shaking occurs. It only happens when i desend, and then not all the time. Other than that , the heli is smooth, any ideas. Would aftermarket blades help, I still have the stock one on it.

Roy,

I had a similar problem on my Caliber and it turned out to be a bent feathering shaft. I also had to change the blade grips because one of them was a little worn where the bearing fits into the blade grip.

sounds like the low end needle needs a little adjustment its running just a tad lean,try richening it up a little see if it solves it.

It is the gyro sensitivity. You need to correctly change your gain and get your headspeed back up to where it should be. I assume you have a 401. If you do then I will tell you how to do it.

Yeah tunning the engine richer should help only because richening it decreased rpms, but it won't make the problem go away. I never flew with a bent feathering spindle so I don't know what that is like, but if it was the case I don't think the helicopter would stop doing that when you change your curves.