Sukhoi Su-47 Berkut, Russia's first-ever fifth-generation swift wing fighter jet | AOD

The Sukhoi Su-47 Berkut, also designated S-32 and S-37 during initial development, was an experimental supersonic jet fighter developed by the JSC Sukhoi Company. A distinguishing feature of the aircraft was its forward-swept wing that gave the aircraft excellent agility and maneuverability.

Originally known as the S-37, Sukhoi redesignated its advanced test aircraft like the Su-47 in 2002. Officially nicknamed Berkut


Su-47 Berkut

(Golden Eagle), the Su-47 was originally built as Russia's principal testbed for composite materials and sophisticated fly-by-wire control systems. The aircraft makes use of forward-swept wings allowing superb maneuverability and operation at angles of attack up to 45° or more.

TsAGI has long been aware of the advantages of forward-swept wings, with research including the development of the Tsibin LL and study of the captured Junkers Ju 287 in the 1940s. Forward-swept wings yield a higher maximum lift coefficient, reduced bending moments, and delayed stall when compared to more traditional wing shapes. At high angles of attack, the wingtips remain unstalled allowing the aircraft to retain aileron control. Unfortunately, forward sweep also induces twisting (divergence) strong enough to rip the wings off an aircraft built of conventional materials. Only recently have composite materials made the design of aircraft with forward-swept wings feasible.

The project was launched in 1983 on order from the Soviet Air Force. But when the USSR dissolved, funding was frozen and development continued only through funding by Sukhoi. Like its US counterpart, the Grumman X-29, the Su-47 is primarily a technology demonstrator for future Russian fighters. However, Sukhoi is now attempting to market the Su-47 to the Russian military and foreign customers as a production fighter in its own right.


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