Top speed of the XF-84H was theorized at 670 mph, and unofficially the aircraft reached 623 mph, but a top speed of 520 mph ...

Max Cruise 301 knots / 346 mph / 557 km/h Range 1,149 nmi (advertised) / 1,852 nmi (at max cruise according to Flying Mag) The title of fastest propeller-driven (but not exclusively) aircraft ever ...

I was watching air racing superstar Steven Hinton attempt to do what his father had done 38 years before: set the three-kilometer speed record for piston-engine, propeller-driven aircraft.

It did hold the title of the fastest single-engine propeller-driven aircraft until unseated in 1989 by a modified Grumman F8F Bearcat. Range was over 2,000 miles for the XF-84H the service ceiling ...