Republic XF-84H Thunderscreech

The Republic XF-84H "Thunderscreech" was an American experimental turboprop aircraft derived from the F-84F Thunderstreak. Powered by a turbine engine that was mated to a supersonic propeller, the XF-84H had the potential of setting the unofficial air speed record for propeller-driven aircraft, but was unable to overcome aerodynamic deficiencies and engine reliability problems, resulting in the program's cancellation. Its name, Thunderscreech, is a reference to its extremely loud supersonic propeller.

XF-84H "Thunderscreech"
XF-84H serial number 51-17060 in flight, with the ram air turbine extended
Role Experimental fighter
National origin United States
Manufacturer Republic Aviation
First flight 22 July 1955
Primary user United States Air Force
Number built 2
Developed from Republic F-84F Thunderstreak
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