The Grumman X-29 was an American experimental aircraft that tested a forward-swept wing, canard control surfaces, and other advanced aircraft technologies. Developed by Grumman, and the two built were test flown by NASA and the United States Air Force. The aerodynamic instability of the X-29's airframe required the use of computerized fly-by-wire control. Composite materials were used to control the aeroelastic divergent twisting experienced by forward-swept wings, and to reduce weight. The aircraft first flew in 1984, and two X-29s were flight tested through 1991.
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