Crash after auto-takeoff..? Can you help me finding the cause?

Hi there,

I am a new user of the ardupilot 2.6 (ArduCopter V3.0.1, using it on a 10" quadrotor), but I have a lot of experience with my own flight controller system. I like the automatic flight capabilities of ardupilot a lot, and I had about 6 very g

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