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Hypersonic flight is no longer science fiction. In recent years, interest in aircraft capable of exceeding Mach 5 has surged, driven by strategic competition, defense challenges, and NASA’s pursuit of next-generation propulsion. But decades before hypersonics entered today’s headlines, NASA had already drafted an aircraft so ambitious it bordered on surreal: a Mach 15 scramjet-powered jetthat never left the drawing board, yet still shapes modern hypersonic research. This guide explores NASA’s forgotten X-43 Hyper X concept, how it fits within the agency’s ambitious hypersonic roadmap, and why ideas like it remain relevant as the US Air Force and global aerospace…
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