A Washington-based firm has flown reusable launch system exceeding Mach 4. The rocket-free reusable ...
Japan tested a Mach 5 hydrogen ramjet. See how this breakthrough brings us closer to hypersonic passenger flights and ...
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America hit Mach 9.6, then shelved the Mach 15 follow-up

“Scramjet-powered vehicles are envisioned to operate at speeds up to at least Mach 15,” NASA said after this program for ...
HyperMach Aerospace announced its SonicStar supersonic business jet (SSBJ) will achieve a top speed of Mach 4.0, significantly faster than previously stated. The Mach 4.0 SonicStar aims to carry 20 ...