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Smoke generators in the nose of the X-29 were used to help researchers see the behavior of the air flowing over the aircraft.

Grumman X-29

Grumman manufactured two airframes. They flew a total of 437 flights between 1984-1992. On Dec. 13, 1985, the X-29 became the first forward-swept-wing airplane in the world to exceed Mach 1 in level flight.

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