This is what happens when the yaw tilt mechanism of the tricopter fails, or at least this is what I think that happened...

I don't know how but the linkage rod of the yaw tilt mechanism came off from the servo arm. I need pliers to do that! I can't do it with my bare hands. The servo noise is from the camera tilt.

Firmware: ArduCopter 2.0.55

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More likely servo failure.  I think the control arm popped off when the prop/tail hit the ground.

It's strange... I've tested the servo and it's ok.

Did you test it under load?  But, like you said, it takes a lot of force to get the servo arm to just pop out.

No, but I have a 3A UBEC (max 5A) and it usually consumes less than 1A.

Wow, those Go Pros are rock solid aren't they!

Yes! They are. After a lot of crashes I've broken only one GoPro and it still works partially :)

I noticed after all that it did manage to correct itself somehow and land on its belly. Really amazing crash.

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