X-51A Waverider 1 mile per second Hypersonic Scramjet

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The Air Force's scramjet, the Boeing X-51A Waverider, set a new world record, Wednesday, when it ran for 200 seconds, burned JP-7, and reached a speed of about Mach 5 (roughly 1 mile per second). In 2004, NASA's X-43 flew much faster (Mach 9.7) but burned hydrogen and managed that for about 12 seconds before it melted. More, here: