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  • Rights: NASA Published 30 November 2011 Size: 2.9 MB Referencing Hub media

    The X-43a hypersonic scramjet test vehicle flew at Mach 9.8. It was 3 metres long and was accelerated by a Pegasus rocket to Mach 5 before release to be accelerated by its scramjet engine to Mach 9.8 (over 12 144 km/h).

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