I helped my friend to build a 7 inch drone with similar components as my own drone. And I have encountered a weird problem which I have never seen before and I can’t diagnose it and can’t solve it. Any help from you guys are appreciated.
Gyro noise level is very low, I have excellent filter performance. PID seems similar to mine and I have run autotune multiple times. Thought it was defected motor so changed to some new motor. I don’t understand esc parameters as much so I left them untouched, and they are the same as my own drone.
There are only frame, assembly or fc I haven’t checked but I’m pretty sure they should not have a problem or could cause this problem.
The problem with this drone is that when I lower the throttle fast, there is a noise coming from the motor, along with YAW change. I think it might be motor fails to slow down but I can’t solve it.
The drone is flyable in stabilize and loiter but not acro, the oscillation is unacceptable when doing yaw.
Motors are acceptably warm after a 2 minute hover.
Video is here: 21310.mp4 - Google Drive