strange pitch angle measurement

Dear all,

In my flight test, I met one accident.

My hexa uses px4+apm flight controller.

during the accident, it flied in the loiter mode, and it flied backward, while I observed that the head was up and the tail was down, then I gave the RC command suc

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magnetic interference to pixhawk on F450

Dear all,

I want to assemble the pixhawk on my Dji F450 frame.

I read the guide on http://pixhawk.org/platforms/multicopters/dji_flamewheel_450, where the pixhawk is assembled between the top and bottom boards.

But I found most quadrotor is assembled wi

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