I wonder what happened here:
The flight was right after a perfect one:
with no parameters changed, as far as I remember. This was in May 11 - it took over a month to find the airplane and some more time to recover it ;)
The plane had an APM2, with ArduPlane V2.33. The flight plan in the crash flight was flown before and was safe wrt terrain obstacles (here: Flight plan). The plane crashed 2/3 of the way from WP #3 to #4.
Has anyone seen this kind of erratic flight (altitude and speed) before? The crash occured because the plane flew much lower than in the plan and with too little throttle. Just a few secs before the crash it appears to make a last-ditch attempt to recover altitude but too late.
It was 28 m up in that tree, and was recoverd by shooting golf balls at it from at compressed air cannon :( The plane was shot to pieces, but amazingly, the APM2 and the GoPro are still alive. The APM2 delivers plausible values from all (IMU, mag, pressure, airspeed) sensors.
I will dig out the flight log as soon as I find out how.. (does not seem to work in Mission Planner).