In its first flight attempt, the Boeing X-51A WaveRider successfully
completed the longest supersonic combustion ramjet-powered flight in
history -- nearly three and a half minutes at a top speed of Mach 5,
the aerospace giant announced. The Air Force described the X-51 is an
unmanned scramjet demonstration aircraft for hypersonic (Mach 6, or
approximately. 4,000 mph at altitude) flight testing.
It flew autonomously for more than 200 seconds, powered by its Pratt
& Whitney Rocketdyne supersonic combustion ramjet (scramjet) motor,
as it transmitted telemetry data to ground stations. Something then
occurred that caused the vehicle to lose acceleration. At that point,
the X-51A was terminated as planned. Even before analyzing the
terabytes of telemetry data transmitted by the X-51A during flight, Air
Force officials called the test an unqualified success.
"The technology proven today is something The Boeing Company has worked
on for the past seven years," said Alex Lopez, vice president of
advanced network and space systems, a division of Boeing Phantom Works.
"It is thrilling to be a part of history and advance hypersonic science
to the next level. Boeing is looking forward to transitioning the
technology to operation in the near term, but for now, we are
exhilarated."
The X-51A was carried aloft under the left wing of an Air Force Flight
Test Center B-52H Stratofortress that took off from Edwards Air Force
Base, Boeing reported. It was released while flying at approximately
50,000 feet over the Point Mugu Naval Air Warfare Center Sea Range;
four seconds later, a solid rocket booster from a U.S. Army tactical
missile accelerated the X-51A to about Mach 4.5. The X-51A's engine
ignited on a mix of ethylene and JP-7 jet fuel. After a short period,
the X-51A ran exclusively on JP-7 jet fuel.
"We are ecstatic to have accomplished many of the X-51A test points
during its first hypersonic mission," said Charlie Brink, X-51A program
manager with the Air Force Research Laboratory at Wright-Patterson Air
Force Base in Ohio. "This gives us huge confidence. We built four test
vehicles to get a successful flight, and we hit many of our goals right
out of the gate, the first time around."
In April, the Air Force successfully launched
a top secret Orbital Test Vehicle (OTV), also known as the X-37B and
commonly described as an unmanned space plane that can re-enter the
earth’s atmosphere. Although an artist’s rendering of the spacecraft in
the OTV mission overview provided by ULA resembles a pint-size space
shuttle, the Air Force has released few details about the classified
project, or when it will return, other than to term the robotic vehicle
a "flexible space test platform" that would conduct various experiments
to allow "satellite sensors, subsystems, components and associated
technology to be efficiently transported to and from the space
environment."
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