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Paul F. Freisthler, chief scientist at DIA, testified that Beijing has aggressively developed and fielded multiple types of hypersonic missiles, including gliders and “scramjet”-powered cruise missiles that maneuver to targets at more than five times the speed of sound to avoid detection.

“China also is actively pursuing high-speed engine, or ‘scramjet,’ technologies which have applications in hypersonic cruise missiles, and has used the Lingyun Mach 6+ scramjet test bed to research thermal-resistant components and hypersonic cruise missile technologies, which would further expand its hypersonic weapons capabilities,” Mr. Freisthler said.

The vehicle may be an unpowered gliding craft, or it may be a cruise missile that uses gravitational acceleration to ignite a special “scramjet” engine that carries it hundreds of miles farther.

The vehicle maybe be an unpowered gliding craft, or it may be a cruise missile that uses gravitational acceleration to ignite a special “scramjet” engine that carries it hundreds of miles farther.

“Such efficiency was considered ‘remarkable’ — nearly doubling that of a traditional scramjet engine working in similar conditions,” said Ma Likun, who led a team of researchers at the university.