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NASA test flight nears record 7,000 mph
An unmanned experimental jet broke a world record for speed on Tuesday, cruising over the Pacific Ocean at just under 7,000 miles per hour in a NASA test of cutting-edge "scramjet" engine technology.
The X-43A aircraft flew at a speed of around Mach 9.6 -- nearly ten times the speed of sound -- after a booster rocket took it to around 110,000 feet and then separated.
A modified B-52 airplane had carried the experimental plane and booster aloft.
It was the last of three test launches for the X-43A series and its supersonic-combustion ramjet or "scramjet" engine. The scramjet scoops up oxygen from the air rather than carrying liquid oxygen in a tank like an ordinary rocket.
Scramjet technology, NASA has said, could open the way to cheaper, safer and faster flights into the upper atmosphere, with smaller and lighter craft.
"I think it's easier than people think it is. We can really do this stuff. I don't mean to make it sound too easy, but it's definitely doable," said Randy Voland, a senior research engineer on the project, at a news conference after the test.
That Mach 7 flight set the previous world record for a jet-powered vehicle, NASA said.
The silvery-black scramjet, just 12 feet long by five feet wide, took off from Edwards Air Force Base in the desert north of Los Angeles perched below NASA's B-52 in the early afternoon Tuesday.
After reaching launch altitude over the Pacific, the modified bomber dropped the scramjet and its booster rocket for a run at the speed record.
Along the way, the scramjet was expected to encounter temperatures of about 3,000 degrees Fahrenheit, roughly one-third hotter than a test in March that reached Mach 7.
Engineers said the scramjet cruised after the separation, neither gaining nor losing speed during its operation. The 20 seconds of operation, they said, gave them far more research than they have had before on jet functions at those speeds.
"We have quite a lot to look at for quite a long time to come," said Laurie Marshall, chief engineer on the flight.
NASA said it had no plans to recover the craft, which has been standard procedure with the scramjet tests. The flight on Tuesday had been delayed from the previous day owing to electronics problems. |
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![NASA's famous B-52B mothership takes off at 1:10 p.m. PST on November 16, 2004, from Edwards Air Force Base in California, carrying the third X-43A scramjet on the nose of a modified Pegasus booster rocket. The unmanned experimental jet broke a world record for speed by accelerating to about 7,000 miles per hour high over the Pacific Ocean in a NASA test of cutting-edge engine technology. The X-43A aircraft apparently reached a speed of just under Mach 10 -- nearly ten times the speed of sound -- after the jet separated from a booster rocket, officials said. [Reuters]](xin_271101171026635150385.jpg)
![In this image captured from an undated video animation, shows the separation of the X-43A research vehicle from the Pegasus booster. [Reuters]](xin_271101171026791162606.jpg)
