13-October-2007, 06:13 PM
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Order of Kilopi
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Join Date: Mar 2004
Posts: 13,449
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I don't know.
Aerospaceweb.org:
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Is it possible for a propeller-driven plane capable of 500 miles an hour to break the sound barrier in a dive from 35,000 feet or so?
NACA research during the mid-1940s did show that supersonic prop-driven aircraft were feasible, but the key was developing propellers that could operate at or near the speed of sound.
[...]
So getting back to your question, it is probably NOT possible for a typical propeller-driven plane such as the P-47, F8F, or Spitfire to become supersonic, even in a dive, because of these shock waves that form when parts of the plane and propeller exceed Mach 1. The internal structures of these aircraft and the propeller blades were not designed to withstand the pressure forces generated by these strong shock waves and would likely disintegrate as they approached Mach 1.
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This might be the best attempt: XF-84H Thunderscreech
Quote:
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Touted as the fastest propeller-driven plane ever built, with a design top speed of 670 mph (Mach 0.9), it is reported to have reached 623 mph (Mach 0.83), but this has been disputed. This record speed is also inconsistent with data from the National Museum of the United States Air Force, which gives a top speed of 520 mph (Mach 0.70) [...]
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