SR-72: US secret hypersonic jet to allegedly break sound barrier in 2025 | Believed to be a top-secret project of the US Air Force, the SR-72 is touted to reach over 4,000 mph (6,437 kph), making i…::undefined

  • @Person264
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    31 year ago

    They’ll test it on the ground and flying slowly first before going fast to make sure it’s safe enough.