When i go over 50% of the throttle, the motor seems to spin @ 100% gradually but quickly and yaw to the right. Hear the sound of motors in the video. What can i do now?
Thanks
Video: http://youtu.be/qeatK4JFG6Y
Tags: arducopter, instable, trouble, yaw

You have a wire loop (battery power).
This is certainly causing compass deviation.
Connect to Mission Planner and watch the compass output when you rise throttle.
Permalink Reply by Guido on November 14, 2011 at 10:33am hi, i changed the battery but it's same. How can i find this "wire-loop"? i don't know where to check. I don't know how to read compass data while flying. I made a log file, could you help me find the compass data?
Thanks so much for reply
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