The XF-91 Thunderceptor: A Look Back at the USAF's Pioneering Mixed-Propulsion Interceptor
The article examines the Republic XF-91 Thunderceptor, a post-WWII experimental interceptor developed for the U.S. Air Force. Designed to counter Soviet bomber threats, the aircraft featured a unique mixed-propulsion system combining a turbojet with four rocket motors for rapid acceleration. The Thunderceptor was also notable for its innovative inverse-taper wing, which was wider at the tips than at the root. Despite being the first USAF aircraft to surpass Mach 1 in level flight, the program was ultimately canceled. Its short operational range and the rapid advancement of jet engine technology rendered the complex design obsolete before it could enter service.
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