The Sukhoi Su-47 Berkut (NATO reporting name Firkin), also designated S-32 and S-37 during initial development, was a Russian experimental supersonic technology demonstrator developed by the JSC Sukhoi Company. A distinguishing feature of the aircraft was its forward-swept wing intended to give the aircraft increased agility and maneuverability. While serial production of the type never materialized and the configuration was not further pursued, the sole aircraft produced served as a technology