Republic XF-84H "Thunderscreech"
An experimental American-built turboprop aircraft based on 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 teething aerodynamic deficiencies, resulting in the cancellation of the program. Seen here at the WPAB part of the goodies in the hangar part of the USAF Museum in Dayton Ohio. If you plan a visit allocate minimum2 days.