The Grumman X-29 was a USAF FSW aircraft that was co-developed by Sukhoi and Grumman in the mid to late 1980's. The SU-37 Russian derivative was a similar concept that arrived after the X-29
The concepts and technologies the fighter-size X-29 explored were the use of advanced composites in aircraft construction; variable camber wing surfaces; the unique forward-swept-wing and its thin supercritical airfoil; strake flaps; and a computerized fly-by-wire flight control system that overcomes the aircraft's instability. They were flight tested at Dryden from 1984 to 1992 in a joint NASA, DARPA (Defense Advanced Research Projects Agency) and U.S. Air Force Program, and made a total of 374 combined flights.
