Pratt & Whitney Rocketdyne has successfully completed a series of hot-fire tests on the second and final RS-68A certification test engine.
A modified version of the RS-68 engine, the RS-68A will be used to power heavy-lift launch vehicles into space.
A liquid-hydrogen / liquid-oxygen booster engine, the RS-68A will provide increased thrust and improved fuel efficiency for the Delta IV family of launch vehicles.
The RS-68A engine will provide 705,000lb pounds of lift-off thrust or 42,000lb of addidion thrust compared with a basic RS-68 engine.
The test series was designed to demonstrate operation of the RS-68A engine over a wide-range of operating conditions.
Pratt & Whitney Rocketdyne RS-68A engine development project manager Jim Tibble said the second RS-68A certification engine E30102 had been successfully hot-fire tested for more than 2,900 seconds over a series of 12 tests.
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