x-51a

X-51A Waverider hits Mach 5.1 in final flight

The final flight of the U.S. Air Force's X-51A Waverider program wasn't a long one, but it was long enough.

The Air Force cheerfully announced Friday that the scramjet-powered X-51A flew for more than six minutes earlier this week. Of that total flight time, partner Boeing said, three and a half minutes was done on scramjet power and the vehicle reached a top speed of Mach 5.1, which pushed it into the hypersonic range that researchers had been hoping for.

The accomplishment marked the longest flight for the $300 million X-51A technology demonstration program and, the … Read more

Unlocked fin likely brought down X-51A in August crash

The U.S. Air Force said today that an experimental test in August of its hypersonic X-51A Waverider failed due to a fin inadvertently unlocking and sending the aircraft into a corkscrew that ended in a crash into the Pacific Ocean.

At the time, the Air Force said only that the August flight had ended with the crash, but didn't reveal what had been at fault. But in a conference call today, X-51A program manager Charlie Brink explained what he and his colleagues have learned over a couple of months of investigation.

The August flight was the third of … Read more

Futuristic X-51A fails in hypersonic bid

No one ever said it would be easy going Mach 6.

The U.S. Air Force's experimental X-51A Waverider failed yesterday in its bid to hit that hypersonic speed. Although the aircraft did separate as planned from its B-52 mother ship in midair, things quickly went wrong. Today's official Air Force statement, issued just minutes ago, describes things this way:

The X-51 safely separated from the B-52 and the rocket booster fired as planned. However after 16 seconds, a fault was identified with one of the cruiser control fins. Once the X-51 separated from the rocket booster, approximately … Read more

X-51A races to hypersonic record

The X-51A Waverider flew today, and it flew fast.

The scramjet engine in the experimental aircraft burned for a little over three minutes at around 10 a.m. PDT Wednesday in a test range over the Pacific Ocean, pushing the X-51A to the hypersonic speed of Mach 5, or five times the speed of sound. That was the top speed reached by the aircraft in its brief flight, according to Boeing and press reports citing U.S. Air Force officials. (Editors' note: A separate Air Force News Service report had initially cited a higher speed, but was amended to give … Read more