Ardupilot 2.5 runaway and crash (with video)

Hello,

I'm trying to figure out what made my drone runaway (extremely fast) when in one of the "automatic"-modes (RTL and auto). 

Hardware:

  • Ardupilot 2.5
  • 3DR gps v. 1.1 (no compass)

Video:

Mission:

3691286575?profile=originalActual flight:

3691286588?profile=original

Story:

I had the whole quad working just fine on previous flights, but the YAW was off by a few degrees (it flew towards the next waypoint, but the YAW wasn't pointing directly at it). I figured it was due to a small compass error which could be calibrated away. After finishing compass calibration, the above mission was started. The takeoff (in auto) went just fine, but then, instead of heading to the waypoint, the quad started accelerating towards some other point. This was very fast, as seen on the video. I then switched to stabilize, and regained control over the quad. However, since it was pretty far away, I've made the mistake of switching to RTL. Which made it accelerate very fast south-south-west again, until it almost flipped and crashed.

I've looked at the logs inspired by http://ardupilot.org/copter/docs/common-diagnosing-problems-using-logs.html, but I couldn't conclude anything. There were no gps glitches, no unexpected vibrations and the compass data, in my opinion, looks just fine (?).

I hope somebody can help!

Tlog, the log from ardupilot as well as the mission are attached.

Mind that the .tlog might be kind of misleading, since the link wasn't very stable.

03-29-16crash.log

2016-03-23crash.tlog

crashMission.txt

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