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The Republic XF-84H "Thunderscreech" is 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 ...
This link says the XF-84H Thunderscreech had a propeller 12.0 feet in diameter, and that the prop rpm was 3000. With π times diameter, its prop tip travel would have been about 37.7 feet per revolution. The speed of sound on the desert floor is about 1125 feet per second, depending on temperature.
XF-84H Two F-84Fs were converted into experimental aircraft. Each was fitted with an Allison XT40-A-1 turboprop engine of 5,850 shaft horsepower (4,365 kW) driving a supersonic propeller. Ground crews dubbed the XF-84H the Thunderscreech due to its extreme noise output. [1] YF-84J
The XF-84H Thunderscreech (not its official name) was an experimental turboprop version of the F-84F. The F-84F swept wing version was intended to be a small variation of the normal Thunderjet with only a few different parts, so it kept the basic F-84 number.
XF-84H "Thunderscreech" Even earlier, in 1997, the Guinness Book of World Records listed the Republic XF-84H Thunderscreech experimental USAF fighter as the fastest propeller-driven aircraft, with a speed of 1,003 km/h (623 mph; 542 kn) or Mach 0.83. [6]
Republic XF-84H "Thunderscreech" – Supersonic propeller testbed; Republic XF-91 Thunderceptor – Inversely tapered swept wing; Rockwell HiMAT – Maneuverability and control research; Rockwell XFV-12 – Augmented wing vectored thrust VTOL; Rotary Rocket Roton 1999 – Single stage to orbit helicopter rocket
Republic XF-12 Rainbow (also known as XR-12) Republic XF-84H Thunderscreech; Republic XF-91 Thunderceptor (initially XP-91) Republic XF-103; Republic XF-106 Thunderscreech; initial designation of the XF-84F; Republic XP-69; Republic XP-72; Republic-Ford JB-2 Loon (US built V-1) Republic Lark
See Republic XF-84H: "Unlike standard propellers that turn at subsonic speeds, the outer 24–30 inches of the blades on the XF-84H's propeller traveled faster than the speed of sound even at idle thrust, producing a continuous visible sonic boom that radiated laterally from the propellers for hundreds of yards. The shock wave was actually ...