XF-91 Thunderceptor
The Republic XF-91 Thunderceptor was first developed as a penetration fighter, then considered as an interim interceptor. The design was characterized by variable incidence (adjustable wing angle of attack) and inversely tapered wings. The Air Force's decision in 1951 to speed up the Corvair interceptor program halted further development of the experimental F-91A interceptor. Work stopped in October, following the mockup inspection. The two XF-91s, already available, had completed performance capability tests utilizing turbojet and afterburner power. The Air Force used the two planes as high-speed armament test vehicles, after augmenting their engines with rocket motors-a proposed built-in feature of the cancelled XF-91A.
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