Motor Vibration with High Kv Motor

ArduCopter Copter 4.3
1

I have a 5" fpv quad that was originally tuned on 1750 Kv motors and it flew great.

I then swapped to 2400 kv motors and kept everything else the same and re-tuned the vehicle. But now I’m experiencing some audible and visual vibe during aggressive stick inputs.

In the data log the vibe looks small, but it’s definitely audible and visible on video.

My thought was that it could be resonance of the prop with the motor at higher rpm, but from the data log it looks like it was operating at a similar RPM to the original config (just at lower throttle)

Any thoughts on cause and solutions would be much appreciated.

Data log: 2023-07-30 19-36-58.bin - Google Drive

2

I think this is actually related to high roll/pitch PIDs resulting from autotune (0.1 aggr)

I ended up doing some manual tuning and was able to notice an improvement in the oscialltions