@lucamax wrote:
Pixhawk last revision with 3.3.3 firmware.
It is not the first time it happens, but previously I suspect bad compass , Gps gliches, solar storms .
before flight I check everything twice and all was going well.
The symptoms that something is going bad soon is the heading that change of some degrees or start to go in one direction.
In dataflash log just before minute 9 you can see a variation in both MAG.MagX andxMAG2.MagX.
That time it start rotated on yaw but it stop or I control it with Yaw stick, do not remember.
It happened again before uncontrolled descent/crash at minute 19.
It start to yaw right for some 150°, I switched to stabilized mode trying to keep the copter up giving more throttle and yaw command bur the hexa do not responds to radio sticks and gently went down in stable attitude , almost as if it was landing automatically but with no control from radio and a little bit fast.
No damages , or crash event on Mission Planner .No error messages, no warnings , no EKF compass errors, Esc or motors were not hot at all.
Almost no vibrations at all.Batteries when copter decided to "land" were at 14.6 Volts , the day after I did a test on a twin copter with different Esc and Ubecs that powered the Pixhawk and was able to fly 10 more minutes after minute 19 of crash.
So batteries are not the problem , when I charged them , they show the same amount of mAh drawn.Looking at dataflash log what is really without explanation to me is :
- Desired Altitude change by itself while I was in Loiter mode !
- Pixhawk received the Throttle command but rose only apparently two motors while the other 4 were reduced.
- Even if I was in Stabilize mode I do not have anymore the control even if the receiver got sticks commands.Yaw rotation in coincidence with Mag error , a cause or a consequence ?
bin. Log File
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