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World’s Most Powerful Hydrogen-Fueled Rocket Engine Completes Final Acceptance Test for ULA Delta IV Heavy Launch Vehicle April 12, 2021 16:32 ET | Source: Aerojet Rocketdyne, Inc. Aerojet Rocketdyne, Inc. Rancho Cordova, California, UNITED STATES STENNIS SPACE CENTER, Miss., April 12, 2021 (GLOBE NEWSWIRE) Today, the world’s most powerful hydrogen-fueled rocket engine built by Aerojet Rocketdyne, the RS-68A, completed its final hot-fire acceptance test for use on the United Launch Alliance (ULA) Delta IV Heavy launch vehicle on the B-1 Test Stand at NASA’s Stennis Space Center in Mississippi. ULA’s Delta IV Heavy rocket uses three Aerojet Rocketdyne RS-68A engines; one on each of its three common booster cores to launch the nation’s most critical spacecraft into orbit. The three RS-68A engines combine to generate more than two million pounds of thrust for the Delta IV Heavy.

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