Lippisch P-13a

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Alexander Lippisch's late 1944 design of a ramjet-powered interceptor featured wings at a 60-degree sweepback and a single large fin housing the cockpit. The intake for the ramjet was circular, protruding from the nose, while exhaust exited beneath the vertical fin. DVL wind tunnel tests up to Mach 2.6 revealed excellent stability with no issues in subsonic speeds. A liquid-fueled rocket motor was planned for takeoff and reaching ramjet speed; powdered coal would be used due to fuel scarcity.