I was testing a Pixhaw replacement and flew around 20 minutes .
I noticed that motor 3 (output 6) often had a difficult start .
Very difficult it could be an Esc issue since with the previous Pixhawk I flew for a couple of hours without any problem and never had that start up issue on motor 3.
After the compass calibration because a different GPS I made a small test flight .
Compass was good, no EKF errors , loiter and heading were fine.
I tried to start Autotune but no reactions , I receive a voice message on my Taranis since I use Frisky mavlink on it but could not understand the meaning apart “waiting for…”.
I aborted Autotune since it doesn not seems to start (since 3.4.6 is always like this )
After a while I return close to the take off zone and suddenly motor 3 lost speed and stopped and after some seconds also motor 6 did the same , trying to control the copter and keep it level I switch to Alt Hold and with some lucky I was able to stop on a branch tree without any damage.
I suspect it is a defect on the Pixhawk even if during Mission Planner Motor Test , motors behavior is perfect.
2017-04-07 16-04-37.bin.zip (1.2 MB)