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F-22是美国空军拟用于21世纪的隐身主力战斗机,1991年4月验证机YF-22在与YF-23试飞竞争中获胜后即展开型号研制。1985年最初计划共需450亿美元(以下都指美元),其中科研费120亿,采购750架约263亿,地面训练等67亿。但后来发展的实际费用远远超过计划,现估计全项目费用大于710亿(科研费最少190亿),而且飞机数量经国会多次讨论定为339架。由于美国正在同时上马三种机型,即“联合攻击战斗机”(JSF)、F/A-18E/F和F-22,今后20年约需要经费3 400亿,美国的国力再强也感觉很难支持。所以,近几年来美国会四次对F-22项目进行重大
The F-22 is the stealthy main combat aircraft to be used by the U.S. Air Force in the 21st century. In April 1991, the verification aircraft YF-22 started its model development after it won the competition with YF-23. The original plan in 1985 required a total of 45 billion U.S. dollars (all of which refer to U.S. dollars below), of which 12 billion were for scientific research, 750 were purchased for about 26.3 billion and ground training was 6.7 billion. However, the actual development costs went far beyond the plan. It is estimated that the total project cost will be more than 71 billion (minimum 19 billion for scientific research) and the number of aircraft will be set at 339 by the parliamentary discussions on many occasions. As the United States is simultaneously launching three types of aircraft, that is, JSF, F / A-18E / F and F-22, there will be an estimated 340 billion over the next 20 years and the United States will have even stronger national strength Feeling difficult to support. Therefore, in the past few years, the United States will make a major F-22 project four times