Two X-29As were built by Grumman after the proposal had been chosen over a competing one involving a General Dynamics F-16 Fighting Falcon. The aircraft first flew in 1984, and two X-29s were flight tested through 1991. Composite materials were used to control the aeroelastic divergent twisting experienced by forward-swept wings, and to reduce weight. The aerodynamic instability of the X-29's airframe required the use of computerized fly-by-wire control. ![]() The X-29 was developed by Grumman, and the two built were flown by NASA and the United States Air Force. The Grumman X-29 was an American experimental aircraft that tested a forward-swept wing, canard control surfaces, and other novel aircraft technologies.
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