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[i]Mark Sirangelo, head of Sierra Nevada Space Systems, the prime contractor for the SpaceShipTwo motors, told SPACE.com that progress is ongoing regarding development of the hybrid motor propulsion for the SpaceShipTwo program.
"Recently we conducted a firing of the motor which extended the burn duration by 30 percent and validated several of the important hardware systems," Sirangelo said. "We are preparing to shortly conduct another firing of the enhanced motor which will extend the burn duration and incorporate several additional important advances in the design.
This firing is expected to lead to final design of the motors for flight testing," he explained.[/i]
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