Republic F-91

The Republic F-91 Thunderceptor was to be a mixed-propulsion jet-and-rocket interceptor fighter designed to catch high-flying strategic bombers.  Two XF-91 prototypes were built, the first one flying May 9, 1949.  One of the prototypes achieved the distinction of being the first American fighter to exceed the speed of sound in level flight, but in general, the performance of the F-91s was not impressive and the project was cancelled in the early 1950s.  One of the two prototypes, 46-680, survives and is in the National Museum of the USAF.


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