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X-43A Proves Scramjet Technology.


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Scramjet Technology.
Scramjet Technology: Image credit: NASA.

It's been a little over a week since NASA's X-43A hypersonic research aircraft made its successful flight, and the flight data is really impressing the agency. The X-43A was accelerated on board a Pegasus rocket, and then it fired its airbreathing scramjet engine to briefly raise its speed to Mach 7 (8,575 kph). While the data proves that the engine definitely worked, reality differed from the engineers simulations in several respects; more flight tests are scheduled to better understand the dynamics of hypersonic flight.

NASA's extremely successful X-43A hypersonic research aircraft flight of March 27, 2004, resulted in a treasure trove of the first actual scramjet flight data ever obtained.

The initial data review of the flight was conducted on March 31, confirming that high-fidelity flight data was obtained throughout the vehicle's boost, stage separation and descent to splash down in the Pacific Ocean.

"The data clearly shows, and without question, that scramjets work," said Griff Corpening, NASA Dryden Flight Research Center's X-43A chief engineer. "But we did see a couple of areas that differed from what was seen in the wind tunnels, thus reinforcing the need for flight testing," Corpening said.

Two very significant aviation milestones occurred on this joint effort by NASA Langley Research Center, NASA Dryden, and their industry partners: First, controlled accelerating flight at Mach 7 under scramjet power, and second, the successful stage separation at high dynamic pressure of two non-axisymmetric vehicles. This was the first time an airbreathing scramjet-powered aircraft has flown freely.

As icing on the cake that capped the mission's success, the flight resulted in the setting of a new aeronautical speed record. The X-43A reached a speed of over Mach 7, or about 5,000 mph, faster than any known aircraft powered by an airbreathing engine has ever flown.

"We flew very closely to how we predicted we would fly in terms of Mach, dynamic pressure, vehicle angle of attack, vehicle yaw, and vehicle roll," Corpening said.

The March 27 flight, originating from NASA's Dryden Flight Research Center, began with NASA's B-52B launch aircraft carrying the X-43A out to the test range over the Pacific Ocean off the California coast. The X-43A was boosted up to its test altitude of about 95,000 ft., where it separated from its modified Pegasus booster and flew freely under its own power.

Planning is underway for the next flight, currently scheduled for this fall. The recent flight success allows engineers to zero in on where to focus their attention, allowing the Hyper-X team to move more quickly and with more confidence in preparing for the Mach 10 flight, Corpening added.

NASA’s Langley Research Center, Hampton, Va., and Dryden Flight Research Center, Edwards, Calif., jointly conduct the Hyper-X program. ATK GASL (formerly MicroCraft, Inc.) in Tullahoma, Tenn., built both the vehicle and the engine, and Boeing Phantom Works in Huntington Beach, Calif., designed the thermal protection and onboard systems. The booster is a modified Pegasus rocket built by Orbital Sciences Corp. Chandler, Ariz.

Original Source: NASA News Release




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