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lollerskates
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Development
[edit]Origins Main articles: Advanced Tactical Fighter and Lockheed YF-22 In 1981, the U.S. Air Force developed a requirement for an Advanced Tactical Fighter (ATF) as a new air superiority fighter to replace the F-15 Eagle and F-16 Fighting Falcon. This was influenced by the emerging worldwide threats, including development and proliferation of Soviet Su-27 "Flanker"- and MiG-29 "Fulcrum-class fighter aircraft. It would take advantage of the new technologies in fighter design on the horizon including composite materials, lightweight alloys, advanced flight-control systems, more powerful propulsion systems and stealth technology. A request for proposals (RFP) was issued in July 1986, and two contractor teams, Lockheed/Boeing/General Dynamics and Northrop/McDonnell Douglas were selected on 31 October 1986 to undertake a 50-month demonstration phase, culminating in the flight test of two prototypes, the YF-22 and the YF-23.[11][12][13] Each design team produced two prototypes featuring one of two engine options, one featuring thrust vectoring. The Pratt & Whitney F119 turbofan with vectored thrust permits a tighter turning radius, a valuable capability in dogfights. During the development process, the ATF's increasing weight and cost drove out some features. A dedicated infra-red search and track (IRST) system was downgraded from multi-color to single color then deleted, the side-looking radars were deleted and the ejection seat requirement was downgraded to t...
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