An unmanned US aircraft has failed in an attempt to fly at six times the speed of sound in the latest setback for hypersonic flight.
The X-51A WaveRider was designed to reach Mach 6, or 3,600mph, after being dropped by a B-52 bomber off the southern California coast on Tuesday. Engineers hoped it would sustain its top speed for five minutes, twice as long as an X-51A has gone before.
But the air force said that a faulty control fin prevented it from starting its exotic scramjet engine and it was lost.
"It is unfortunate that a problem with this sub-system caused a termination before we could light the scramjet engine," Charlie Brink, of the Air Force Research Laboratory at the Wright-Patterson Air Force Base in Ohio, said in a statement.
The WaveRider successfully detached from the B-52 and fired the rocket booster as planned. Then its scramjet engine was supposed to take over as it attempted to climb to Mach 6.
But that never happened and 15 seconds after separating from the rocket booster, the WaveRider lost control, preventing a test of the scramjet engine.
"All our data showed we had created the right conditions for engine ignition and we were very hopeful to meet our test objectives," Mr Brink said.
The Pentagon has been testing hypersonic technologies in the hope of delivering strikes around the globe within minutes.
It was the latest failure for the WaveRider programme. A test flight last year ended prematurely with an X-15A trying to restart its engine until it plunged into the Pacific Ocean. During the first flight of an X-51A in 2010, it reached nearly five times the speed of sound for three minutes.
There is only one X-51A vehicle left. The air force has not decided whether it will fly.