Hypersonic jet fails first test.
(Najamuddin Ghanghro, Karachi (original from Larkana))
LOS ANGELES (AP) — An unmanned
experimental 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, 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.
https://au.news.yahoo.com/queensland/a/-/world/14565032/hypersonic-jet-fails-first-test/