The Sukhoi Su-47 Berkut (Russian: Су-47 Беркут—Golden Eagle) (NATO reporting name Firkin), also designated S-32 and S-37 (not to be confused with the twin-engined delta canard designoffered by Sukhoi in the early 1990s under the designation Su-37) during initial development, was an experimental supersonic jet fighter developed by Sukhoi Aviation Corporation. A distinguishing feature of the aircraft was its forward-swept wingthat gave the aircraft excellent agility and maneuverability. While seri