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Northrop F-5 Freedom Fighter : ウィキペディア英語版
Northrop F-5

The Northrop F-5A/B Freedom Fighter and the F-5E/F Tiger II are part of a supersonic light fighter family, initially designed in the late 1950s by Northrop Corporation. Being smaller and simpler than contemporaries such as the McDonnell Douglas F-4 Phantom II, the F-5 cost less to both procure and operate, making it a popular export aircraft. The F-5 started life as a privately funded light fighter program by Northrop in the 1950s. The design team wrapped a small, highly aerodynamic fighter around two compact and high-thrust General Electric J85 engines, focusing on performance and low cost of maintenance. Though primarily designed for the day air superiority role, the aircraft is also a capable ground-attack platform. The F-5A entered service in the early 1960s. During the Cold War, over 800 were produced through 1972 for U.S. allies. Though the USAF had no acknowledged need for a light fighter, it did procure roughly 1,200 Northrop T-38 Talon trainer aircraft, which were directly based on the F-5A.
After winning the International Fighter Aircraft competition in 1970, a program aimed at providing effective low-cost fighters to American allies, Northrop introduced the second-generation F-5E Tiger II in 1972. This upgrade included more powerful engines, higher fuel capacity, greater wing area and improved leading edge extensions for a better turn rate, optional air-to-air refueling, and improved avionics including air-to-air radar. Primarily used by American allies, it remains in US service to support training exercises. It has served in a wide array of roles, being able to perform both air and ground attack duties; the type was used extensively in Vietnam. A total of 1,400 Tiger IIs were built before production ended in 1987. More than 3,800 F-5 and T-38 aircraft were produced in Hawthorne, California.〔"Military Aircraft Update: Northrop F-5/T-38. ''Aviation Week & Space Technology'' (Aviation Week Intelligence Network), Volume 175, Issue 39, 21 November 2013, p. 89.〕
The F-5 was also developed into a dedicated reconnaissance version, the RF-5 Tigereye. The F-5 also served as a starting point for a series of design studies which resulted in the Northrop YF-17 and the F/A-18 navalized fighter aircraft. The Northrop F-20 Tigershark was an advanced variant to succeed the F-5E which was ultimately canceled when export customers did not emerge. The F-5N/F variants are in service with the United States Navy and United States Marine Corps as an adversary trainer.〔 Approximately 500 aircraft are in service as of 2014.〔Hoyle, Craig. ("World Air Forces 2014." ) ''Flightglobal.com'', p. 5. Retrieved: 3 September 2014.〕
==Design and development==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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