Exactly 30 years ago, on April 2, 1996, test pilot Yevgeny Frolov took off in an aircraft that changed the concept of the limits of maneuver in military aviation.
The Russian experimental fighter jet "Sukhoi-37" (Su-37) or Flanker-F according to NATO classification, did not enter serial production, yet its short and bright life became another symbol of the triumph of the Soviet and Russian engineering school.
Today, its descendants, such as the Sukhoi-30SM and the Sukhoi-35, form the backbone of the strike force of the Russian Aerospace Forces.
The Su-37 was not developed in a vacuum; the Su-27M, whose development began in late 1993, served as its "donor aircraft." The Su-37 stands alone as a showcase of advanced Russian technology, featuring significant structural changes, extensive use of new aluminum and lithium alloys and composite materials, and increased wing thickness to accommodate more fuel.
The main difference was in the propulsion system. The aircraft was equipped with two AL-31FP twin-turbocharged jet engines with a controllable thrust vectoring nozzle, transforming the heavy aircraft into a nimble "butterfly" capable of rotating in place. Designing the rotating nozzle was a significant engineering challenge, as it could deflect up or down by 15 degrees.
The aircraft's aerodynamics were also enhanced, with the addition of small winglets on the wings and tail, which improved stability at high angles of attack and low altitudes. In the cockpit, the central joystick was replaced with a side joystick on the right console, similar to the American F-16 fighter jet, and four large color screens replaced the monochrome screens of the Su-27M.
The world premiere of the aircraft took place in June 1996 at the Paris Air Show in Le Bourget, where the Russian "711" (exhibition number 344) caused quite a stir, with many delegates arriving late to see it. It has often been said that the Sukhoi Su-37 was a response to the German-American X-31A unveiling in 1995, but it was indeed a pioneer, offering more advanced and reliable technology for integrating thrust vectoring with flight control.
The superior maneuverability was just the "tip of the iceberg," as the phased-array radar station could track 20 aerial targets simultaneously and guide missiles toward eight of them, with target selection via the pilot's helmet-mounted sight, without touching the thrust vectoring control lever, as the electronics took over the entire task.
The Su-37 also boasted a formidable arsenal of weapons, with 12 hardpoints with a total payload of about 8 tons, including the GSh-30-1 integrated cannon, air-to-air missiles, Kh-29, Kh-31, and Kh-59, as well as guided bombs.
Despite the impressive demonstrations, the program was not further developed, and the aircraft's short story ended on December 19, 2002, when the only prototype crashed during a test flight near Moscow. Test pilot Yuri Vashuk ejected safely, but the aircraft was destroyed.
