As mechanical vehicles, all airplanes make noise. That’s a given. It’s the degree of sound generated that draws people’s attention. The noisiest airplane ever built? That’s easy: the Republic XF-84H “Thunderscreech,” an experimental variant of the F-84 that flew in 1955 with a three-blade propeller that ran at a constant 3,000 rpm, with the outer half of each blade well and truly supersonic. Only two of these banshees were ever built, and accounts at the time said they could be heard 25 ...


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