Introduction: The Hypersonic Revolution Hypersonic flight—defined as speeds exceeding Mach 5, or 3,836 mph (6,200 km/h)—has moved from the realm of science fiction to the forefront of aerospace engineering. Central to this leap is scramjet, or supersonic combustion ramjet, propulsion: a technology capable of transforming military power, redefining space access, and even revolutionizing commercial travel….

