The X-43a hypersonic scramjet test vehicle flew at Mach 9.8. It was 3 metres long and was accelerated by a Pegasus rocket to Mach 5 before release to be accelerated by its scramjet engine to Mach 9.8 (over 12 144 km/h).
The X-43a hypersonic scramjet test vehicle flew at Mach 9.8. It was 3 metres long and was accelerated by a Pegasus rocket to Mach 5 before release to be accelerated by its scramjet engine to Mach 9.8 (over 12 144 km/h).