19FortyFive on MSN
NASA’s X-43A hit a record Mach 9.68 for ten seconds. The X-43D could have hit Mach 15 but never had a chance to fly
The fastest air-breathing aircraft ever flown was twelve feet long, carried no pilot, and was designed from the start to end ...
19FortyFive on MSN
NASA’s X-43D: Mach 15, thirty seconds of engine time, three planned flights, and not one vehicle ever built
The X-43D was designed to hold a scramjet at Mach 15 for thirty seconds, released from a Peacekeeper rocket at 200,000 feet.
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