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Hello All,

Please help me trying to understand what happend during my last flight( see youtube video min 7:35).

Edit-see attached log.
I was in loiter giving yaw command, waited for few seconds and it just speed up forward and crashed.
My quad is well build and i have external compass on a stick with the GPS.
Done all the tunings and the compass calibrations etc...

The quad is very stable in the air with no vibration at all, after reading the log: -9 on the Z axis and 2-3 on the XY axis.
The APM is powerd with UBEC on 5.1 volts.
Firmware 3.0.1
Please help me- I'm scared now

https://www.youtube.com/watch?v=wNvxog39WI0

2013-09-09 23-17 65.log