How does feedback help the X-29 experimental aircraft?

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While I'm not clear on the precise details, generally, the aircraft has a sensory system that allows the controller to know when the angle of attack is such that the aircraft will continue to pitch up if left unchecked. Using this knowledge, the controller can counteract the "flipping" tendency by actuating the elevator to pitch the aircraft down just enough to maintain the angle of attack at the desired value.

--Julia Braman 16:52, 1 October 2008 (PDT)