The Republic XF-91 Thunderceptor was a mixed-propulsion prototype interceptor aircraft, developed by Republic Aviation. The aircraft would use a jet engine for most flight, and a cluster of four small rocket engines for added thrust during climb and interception. The design was largely obsolete by the time it was completed due to the rapidly increasing performance of contemporary jet engines, and was built to the extent of two prototypes only. One of these was the first US fighter to exceed Mach 1 in level flight.
Read more about Republic XF-91 Thunderceptor: Design and Development, Testing and Evaluation, Aircraft On Display, Specifications (XF-91 Thunderceptor)
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“Jean Jacques Rousseau ... is nothing but a fool in my eyes when he takes it upon himself to criticise society; he did not understand it, and approached it with the heart of an upstart flunkey.... For all his preaching a Republic and the overthrow of monarchical titles, the upstart is mad with joy if a Duke alters the course of his after-dinner stroll to accompany one of his friends.”
—Stendhal [Marie Henri Beyle] (1783–1842)