The U.S. Air Force's experimental X-51A Waverider set a hypersonic flight record when it flew at Mach 5 — five times the speed of sound — for more than three minutes. The previous scramjet record was a mere 12 seconds.
The U.S. Air Force's experimental X-51A Waverider set a hypersonic flight record when it flew at Mach 5 — five times the speed of sound — for more than three minutes. The previous scramjet record was a mere 12 seconds.
