Home Science & Space Hypersonic sled travels at 6,599 mph (Mach 8.6) at Holloman Air Force Base Hypersonic sled travels at 6,599 mph (Mach 8.6) at Holloman Air Force Base September 5, 2019399 Holloman Air Force Base is home to the High-Speed Test Track. This was a hypersonic test that traveled Mach 8.6, which is 6,599 mph which is over one mile a second.
