I've changed from 3s to 4s, and started on Stablize, it was ok, then when I changed to Altitude Hold, it started to gain altitude very fast, then I got it back down to stabilize, then It did the same in loiter, it was a very cloudy day, I noticed the gps signal to be quite glitchy
My setup: 1kg 450mm quad frame, 9X4.7 props, 30A Turnigy plush ESC, 1000kv 300watts motors, APM 2.5 and AC 3.1.5
Replies
Did you do ESC calibration after changing from 3S to 4S?
I found that when I change between 3 and 4S and back again, I have to ESC calibration.
I think I should adjust Throttle Accel P, I and Altitude Hold P, but I'm not sure how
These are the PID values I've got after using Autotune on 3S Battery
X450 3s APM PIDs.jpg