X-51A Waverider – How Fast is Mach 6

The US Air Force X-51A Waverider had a successful test flight on Wednesday. The USAF announced that X-51A Waverider missile has hit speeds of Mach 6 and sustained the speed for more than 200 seconds.

How fast is Mach 6? Mach 6 at sea level (0 feet) is 4567.3 MPH (Calibrated Airspeed) and 4567.3 MPH (True Airspeed), while Mach 6 at FL50 (Flight Level 50,000) is 3147.97 MPH (CAS) and 3960.31 MPH (TAS).

The X-51A Waverider is powered by a Pratt Whitney Rocketdyne SJY61 scramjet engine.