Cyclic servo jittering

[slinger1]

Hi guys,

Just had a test run on the bench after enabling the Governor on my SK-540 (Trex 500 ESP).

I had to reduce the governor gain a fair bit in order to eliminate a tail wag, but it seems to perform nicely now.

However, during the test run I noticed that all three cyclic servos have a slight jitter (no jitter on the tail servo).

Obviously this could be vibration related, but the heli appears to run rather smooth. Just in case, I tried 4 different mounting pads, but the jitter remains the same.

I also reduced some of the gain values dramatically in order to check if it makes any difference, but no luck so far. I also increased the dead band up to 5 hoping that it makes any difference, but no luck either.

The jitter isn't huge and it may not be noticeable during flight, but I rather eliminate it, if possible.

Did anybody experience the same issue? If so, please let me know how you fixed it.

Cheers!

[dilberto]

Originally Posted by slinger1

Hi guys,

Just had a test run on the bench after enabling the Governor on my SK-540 (Trex 500 ESP).

I had to reduce the governor gain a fair bit in order to eliminate a tail wag, but it seems to perform nicely now.

However, during the test run I noticed that all three cyclic servos have a slight jitter (no jitter on the tail servo).

Obviously this could be vibration related, but the heli appears to run rather smooth. Just in case, I tried 4 different mounting pads, but the jitter remains the same.

I also reduced some of the gain values dramatically in order to check if it makes any difference, but no luck so far. I also increased the dead band up to 5 hoping that it makes any difference, but no luck either.

The jitter isn't huge and it may not be noticeable during flight, but I rather eliminate it, if possible.

Did anybody experience the same issue? If so, please let me know how you fixed it.

Cheers!

I've had a case of servo jitter that was fixed by cleaning the potentiometer. If your servos are getting older try it out. This guy made a good video showing how to do that on the align 410 servos

[ame]http://www.youtube.com/watch?v=IXcRIXvX1IU[/ame]

[slinger1]

Could the installation of a phase sensor (Hobbywing) cause "twitching" in the cyclic servos?

I still haven't been able to fix this issue. Don't think it has anything to do with the gyro's gain settings. I am suspecting a mechanical or electromagnetic issue.

Turning the governor on and off makes no difference.