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The Fastest Piston-Powered Airplane That Never Flew - The Double V8, Twin-Prop RP-4
The Fastest Piston-Powered Airplane That Never Flew - The Double V8, Twin-Prop RP-4

2 Sep 2022, 15:27 UTC · By: Razvan Calin / One of aviation's lesser-known brave hearts, the RP-4 had an outrageously bold ambition of flying over 600 mph. An engineering marvel, the plane never took off