Lockheed Martin is claiming a tenfold increase in hybrid rocket fuel-grain structural integrity after a 7.5-sec. test firing at Stennis Space Center. The 10-in.-dia. motor generated 7,000 lb. thrust during the test, which marked the company's latest activity in an ongoing effort to develop the technology that combines inert solid fuel and a liquid oxidizer. Unlike Burt Rutan's SpaceShipOne, which uses nitrous oxide as an oxidizer, Lockheed Martin's test motor used liquid oxygen. Both motors ...

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