When DARPA, the Air Force, NASABoeing, and Pratt & Whitney got together to unscramble the the riddle behind scramjet technology, it's unlikely they ever considered failure, until now.

The five companies sent three X-51A Waveriders shooting above the Pacific in the last two years and while the first effort in 2010 showed promise, the other two were undeniable failures.

It must be disappointing because in 2010 things went off without a hitch. The Waverider was strapped to the belly of a B-52, dropped, powered up its solid-rocket boosters and made the full transition to scramjet-powered flight.

While the X-51 Waverider, an unmanned hypersonic scramjet is supposed to tear through the sky at 4,000 miles per hour and promise an untold richness for future flight, this current effort looks like a flop.

W.J. Hennigan from the Los Angeles Times talked to Robert A. Mercier, deputy for technology in the high speed systems division at the Air Force Research Laboratory in Ohio who said: "Since the Wright brothers, we have examined how to make aircraft better and faster. Hypersonic flight is one of those areas that is a potential frontier for aeronautics. I believe we're standing in the door waiting to go into that arena."



The X-51's final flight is scheduled for late spring 2013 or early summer.

X-51 waverider US Air Force

X-51 waverider US Air Force

X-51 Waverider US Air Force
