Hypersonic plane startup, Hermeus, plans to make a plane faster than the SR-71 blackbird spy plane. the SR-71 could reach mach 3.3 and fly at 85000 to 100,000 feet in altitude. Quarterhorse Mk 2 will fly with this precooler-F100 engine combination and be capable of hitting speeds greater than Mach 2.5. The entire Chimera engine, ...

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Link :
https://www.nextbigfuture.com/2024/08/controlled-dive-to-get-to-first-mach-5-drones-in-2026.html