The XF-84H Thunderscreech (with real Audio samples) first flew on July 22, 1955, a turboprop experiment from the F-84F Thunderstreak with a 5,850-hp Allison engine driving a 12-ft prop whose tips hit Mach 1.18 and created continuous sonic booms. It hit 520 mph in tests, could scream audible 25 miles away, and made ground crews nauseous or worse, but only 12 flights happened with 11 emergency landings before cancellation in 1956.👀

The XF-84H Thunderscreech Was Such a Terrible Plane That It Gave Men Seizures