LOS
ANGELES (AP)—An unmanned experimental U.S. aircraft failed during 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 3,600 mph (5,800 kph),
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 Wednesday 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 subsystem 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. Fifteen
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,” Brink said.

The Pentagon has been testing hypersonic technologies in hopes of delivering strikes around the globe within minutes.

It
was the latest failure for the Waverider program. 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 near five times the speed of sound for three minutes.

There’s only one X-51A vehicle left. The Air Force has not decided whether it will fly.

Source: The Associated Press