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Rocket engine scores a ’10’ in test for space plane

AR-22 engine firing
Aerojet Rocketdyne’s AR-22 rocket engine fires during a test at NASA’s Stennis Space Center in Mississippi. (NASA / DARPA Photo)

A rocket engine built from spare space shuttle parts — and the team behind the engine — passed a grueling 10-day, 10-firing test that sets the stage for Boeing’s Phantom Express military space plane.

“We scored a perfect 10 last week,” Jeff Haynes, Aerojet Rocketdyne’s program manager for the AR-22 engine, told reporters today during a teleconference.

The hydrogen-fueled AR-22 is largely based on the RS-25 engine that was used on the space shuttle and will be used on NASA’s heavy-lift Space Launch System. “We’ve upgraded the ‘brain’ for this derivative mission,” using an advanced controller, Haynes said.

Aerojet, Boeing and the Pentagon’s Defense Advanced Research Projects Agency, or DARPA, set up the 240-hour test between June 26 and July 6 to see whether the AR-22 could be turned around rapidly enough for a 100-second, full-throttle firing every day. The bottom line? It can.

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By Alan Boyle

Mastermind of Cosmic Log, contributing editor at GeekWire, author of "The Case for Pluto: How a Little Planet Made a Big Difference," president of the Council for the Advancement of Science Writing. Check out "About Alan Boyle" for more fun facts.

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