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The Republic XF-91 Thunderceptor was another of several mixed-propulsion projects for interceptor aircraft during the late 1940s. It was planned to use a jet engine for cruise speed, and a cluster of four small rocket engines for climb and combat. Although two prototypes were constructed – the first equipped with radar and the second with the butterfly fin – the combination of rapid development of jet engines, short range (the endurance of the Thunderceptor was limited to some 25 minutes), and the design of their fuselages rendered them obsolete. (Artwork by Goran Sudar)
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