The Grumman X-29 is an American experimental aircraft designed to test a forward-swept wing, canard control surfaces, and other novel aircraft technologies. Funded by NASA, the United States Air Force
A Grumman X-29 in flight
X-29 with aft control surfaces deflected
Grumman X-29A at the National Museum of the United States Air Force
The Sukhoi Su-47 Berkut is a Russian twin-engine, forward-swept wing, supersonic technology demonstrator developed by the JSC Sukhoi Company.
Grumman X-29
…Aircraft of comparable role, configuration, and era Sukhoi Su-47 Rockwell-MBB X-31…
The Su-47 at an airshow in June 2007
Su-47 next to a Sukhoi Su-35UB at the MAKS-2003 air show.
Sukhoi Su-47 Berkut in the lead, followed by a Su-27SKM (top) and a Su-30MKK (bottom).
Sukhoi Su 47 Berkut in 2001