I’m having a strange thing happen. I did a flight and found the performance not that great. Landed due to the battery running low. Changed to a new pack, then found the motors running really rough at idle and the motors not wanting to spin up. Sounded like rusted nails in a tin can.
My system did report software updates and I upgraded both Mission Planner as well as Copter to the latest versions.
The same issue persisted so recalibrated everything including the ESCs. Problem persists.
If I rotate the motors by hand then there are no obstructions.
if I test the motors one at a time motor 1 runs ruff consistently. Motors 2,3,4 runs smoothly every time.
Arming the system and getting initial idle speed, all the motors run rough.
Logfile of a short bench test at https://drive.google.com/file/d/1-rvPZ0cG5K8j550ub7LdBIwERfGAQKyc/view?usp=sharing