In the early 2000s, NASA was among the first to achieve sustained hypersonic flight. As part of the broader Hyper-X program, ...
What was X-43D?: A NASA design for a hydrogen-fueled scramjet aircraft capable of Mach 15, stopped after feasibility work over thermal and budget concerns. Why it matters: Current hypersonic projects ...
NASA’s second attempt to fly an X-43A air-breathing hypersonic test aircraft is set for mid-December. The first effort ended with the destruction of the vehicle over the Pacific on 2 June 2001.