Loss altitude in auto

hassani · January 5, 2021, 1:23pm

Hi dears, I have a quadcopter and it’s almost OK.
After some flight in auto mode loses altitude. But in other modes it’s true.
What is the reason?
Log file : https://ufile.io/dupvyn4u

dkemxr · January 5, 2021, 3:42pm

I have no idea how your Mission was programmed but I would say you have a power/battery problem. The battery sags to <9V under load and the average commanded motor output at hover is ~1800us.

hassani · January 5, 2021, 5:19pm

Right, but i was surprised, because in loiter or alt-hold the altitude was true (no reduction).
The mission was short path and without changing the altitude.

dkemxr · January 5, 2021, 6:07pm

Barometers say it’s not really changing altitude until you switch out of Auto and then perhaps the Rangefinder is active. Hard to say though as it’s only a 1m or so change. I would worry more about available power than a small change in altitude.