National Security Journal on MSN

NASA’s X-43D was designed to fly at Mach 15 — engineers warned the aircraft would have literally melted in flight

NASA’s X-43D was designed to fly at speeds approaching Mach 15 — roughly 11,000 miles per hour — using a hydrogen-fueled ...
National Security Journal on MSN

NASA’s X-43A flew at Mach 9.6 and 110,000 feet: No air-breathing aircraft has gone faster in the 22 years since that flight

NASA’s X-43A scramjet aircraft hit Mach 9.64 at 110,000 feet in November 2004—and that record for an air-breathing aircraft ...