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Brickapede2 20 points ago +20 / -0

Never been done, but I think the prop driven Thunderscreech was designed (though never built) to go 1,000 mph, or mach 1.3. A Tupolev back in the 60s went 550 or so (about mach 0.7).

1000 knots is about mach 1.5.

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Miskyavine 2 points ago +2 / -0

Never built that we know of. I bet the US military has had planes enter service and retire that we will never know about.