Watch Boeing's X-51A WaveRider Scramjet Blast Off to Mach 5.1

Boeing's X-51A WaveRider Scramjet has had its share of bad luck. While its first test flight in 2010 went fine, the two that followed ended with unsatisfactory plops. Now, the USAF has just completed the fourth and final test, and the result was a screaming 370 seconds of scramjet glory and literally hypersonic speeds.