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Hermeus completes ground testing on first Quarterhorse hypersonic testbed
By 
Ryan Finnerty4 January 2024
The non-flying Quarterhorse Mk 0 test article is the first of four aircraft in the Quarterhorse programme, through which US start-up Hermeus aims to produce a hypersonic vehicle capable of reaching Mach 4 and surpassing the all-time airspeed record held by Lockheed Martin’s SR-71 Blackbird.
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