Analyzing Cyclic oscillations and PID tuning
I've browsed this board briefly to see if this topic was covered but didn't see anything.
I have a Kraken 700 Nitro that has intermittent cyclic oscillations and am trying to figure out an approach to my next attempt to fix the problem. At this point I am not sure if the problem is physical (ie; problem with a rotor head component) or electronic (ie; too high P, I, or D). So far I've replaced my original 3M mounting tape with Brain supplied tape and am re-doing my logging to capture all aileron/elev logs (ie; RxAileron%, ElevatorOut% X-Acceleration G to name a few).
At this point, I was starting to wonder what exactly I should log to try to track this problem (this is my main inquiry) and also wanted to see if anyone has experience doing what I'm trying to do and what they did to arrive at a solution.
The second part of this inquiry (which I'll probably re-write in the "Request/Suggestions" forum) is how nice it would be for logging to have PID logging similar to BetaFlight as seen in this attachment to help track these types of problems down:
As always, it is not useful to anyone to make hundreds of vague theories, improbable assumptions, speculations, conjectures and suppositions, the best thing is to rely on certain data.
If you send the file of the current configuration of your FCU, we can load it into the software in Demo Mode and verify all the settings you made for each of the FCU parameters and if you also send the Flight Log file and the Events file we would have more certain information with which we can try to find a logical cause of the problem.
Please, read answer to Q1 in the FAQ section.