What was the fastest propeller driven fighter aircraft during WW2?
The fastest propeller driven fighter was the North American P-51H which was rated at 487 mph at 25,000 ft. The H model was a lightened and up-horsepowered version of the P-51D that was intended for use in the Pacific theater. The H-model is readily idenifiable from the D-model by its taller tail structure. Much of the H-model’s weight loss can be attributed to the fact that it was built to a lower G tolerance the the D-model (something like 5.6 G’s vs 8 G’s). 555 H models were built before the end of the war but I don’t know how many saw actual combat. The F8F Bearcat might be another contender (I know it had a faster rate of climb), but I’m pretty sure none of them saw any WWII combat.
The P-47M was the fastest US built fighter that served from late 44 until the end of the war in Germany in 1945.
A conervitave test figure for the plane puts its top speed at 473mph.
The P-47N had the same power plant and ended up with a larger wing to hold more internal fuel stores so i could fly the longer missions required in the Pacific. Its top speed was 467mph.
The other contenders would have likely been the TA-152H and the Do-335 both said to have been developed prior to end of the war but rarely saw combat.
There is also the P-72. It was the first prop driven fighter to reach over 500mph in level flight.