Sukhoi Su-37

The Sukhoi Su-37 (NATO reporting name: Flanker-F) is an experimental single-seat, supermaneuverable multirole jet fighter, designed by Sukhoi. A further development of the original Su-27 "Flanker", it was modified from the first-generation Su-35 (formerly "T10M") prototypes. The Su-37 features an upgraded avionic suite and fire-control system, but its most notable additions are the thrust vectoring nozzles. Only two prototypes were converted.

During the Su-35 flight test programme, active controls during dogfighting maneuvers could not be attained; thus Sukhoi explored the application of thrust-vectoring nozzles to give fighters better dogfighting attributes. The first Su-37, converted from the eleventh Su-35, made its maiden flight in April 1996 at Zhukovsky. It was joined by a second prototype in 1998. Throughout the program, the Su-37 publicly demonstrated its attributes at numerous air shows, performing maneuvers impossible to complete with normal flight control methods, among which was a 360° somersault. Despite its potential advantages, the Su-37 did not enter production; it has instead remained as a technology demonstrator for updated Su-27 family aircraft such as the export Su-30 and the modernized Su-35.