![]() ![]() Further testing at TsAGI validated the designs' estimated radar cross-sections and flight profiles. As the programs progressed, MiG settled on an intake ramp below the cockpit, with variable geometry ramps to control airflow and thrust vectoring nozzles on the engines, which improved both maneuverability and short takeoff performance. Tests were carried out at TsAGI (Tsentralniy Aerogidrodinamicheskiy Institut, "Central Aero- and Hydrodynamic Institute") to refine the designs of both aircraft, which included canards and delta wings in an aerodynamically unstable design, which is useful for improving agility. The MiG OKB set to work designing two aircraft, a light fighter (LFI - Lyogkiy Frontovoy Istrebitel, "Light Frontline Fighter"), and a multirole heavy aircraft (MFI - Mnogofunksionalni Frontovoy Istrebitel, "Multifunctional Frontline Fighter"). The Soviet Union took note of the program, and set its OKBs (Опытное конструкторское бюро" – Opytnoye Konstruktorskoye Byuro, "Experimental Design Bureau") to work designing a replacement for the Su-27 that would challenge the new US jet. The USAF's Advanced Technology Demonstrator program sought to replace the F-15 Eagle, and the Air Force's requirements included a number of cutting edge technologies such as supercruise (the ability to travel at Mach 1+ without afterburner) and stealth.
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