|NASA Scores Success in
Space Travel 'Holy Grail'
Sat Mar 27, 2004 10:10 PM ET
SAN FRANCISCO (Reuters) - A revolutionary jet engine flew faster than
seven times the speed of sound in a high altitude test over the Pacific
on Saturday, marking what NASA scientists hailed as a milestone in
developing the "Holy Grail" of space travel.
"It's been an outstanding, record-breaking day," lead
propulsion engineer Lawrence Huebner told a post-flight briefing.
NASA's 12-foot-long (3.6 meter) X-43A research vehicle -- resembling
a winged surfboard -- hit slightly over Mach 7, about 5,000 mph (8,000
km/h), during 11 seconds of powered flight before gliding at hypersonic
speeds for several minutes and finally plunging into the ocean.
The test, conducted off the southern California coast, marked the
first time that a "scramjet," or supersonic-combustion ramjet,
has powered a vehicle at such high speed.
"The ramjet-scramjet is the Holy Grail of aeronautics in my
mind," project manager Joel Sitz told the briefing. "If you go
from ground to space, you need to use a ramjet-scramjet if you're going
to do it in the most efficient way you can."
Rather than carrying both the fuel and oxygen needed to provide
acceleration, like a conventional rocket engine does, scramjet engines
carry only hydrogen fuel and pull the oxygen needed to burn that fuel
from the atmosphere.
Researchers at the NASA Dryden Flight Research Center at Edwards Air
Force Base, on the western edge of the Mojave Desert north of Los
Angeles, hope the new engine will revolutionize aviation, speeding the
development of significantly faster aircraft and lowering the cost of
Huebner said the test had set a world speed record for a craft
powered by an air-breathing engine.
"To put this in perspective, a little over 100 years ago a
couple of guys from Ohio flew for 120 feet in the first controlled
powered flight," he said, referring to the Wright brothers.
"Today, we did something very similar in the same amount of
time, but our vehicle under air-breathing power went over 15
Project members said the successful test had important commercial and
"Efficient access to space opens up a whole new world for
industry in the future, to be able to get to space and get back,
quickly, and do it several times a month," Sitz said.
Project chief engineer Griffin Corpening said NASA had shown what was
possible. "Now business and industry and the military can come
forward with confidence that they can now use this kind of a propulsion
system," he said.
The first test of the X-43A in June 2001 ended in failure after a
malfunction in the booster rocket attached to the test vehicle forced
NASA scientists to blow up the plane.
During Saturday's test, a modified B-52 bomber dropped the X-43A at
an altitude of around 40,000 feet.
A rocket attached to the 2,800-pound (1,270-kg) research vehicle then
boosted it to an altitude of 95,000 feet, setting the stage for the
scramjet engine test.
Later this year, NASA researchers hope to test the engine at Mach 10,
or about 7,000 mph (11,265 km/h), as part of their Hyper-X program.
The vehicle used in Saturday's test will not be recovered from the
ocean due to the high cost of such an effort.