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[i]Designated the RD-181, the new engine will be used on Antares in shipsets of two to accommodate as closely as possible the two-engine configuration built around the AJ-26 engines supplied by Aerojet Rocketdyne, Orbital Sciences managers said Dec. 16. A descendant of the RD-171 that powers the Ukrainian-built Zenit launch vehicle, the RD-181 will be manufactured in the same Khimki factory that builds the RD-180 used on the United Launch Alliance Atlas V. It closely resembles the RD-191 on Russia's new Angara launcher and the RD-151 that powers South Korea's Naro-1 launch vehicle. In testing at Energomash, "the RD-181s have seen more than two times the Antares flight duration to date, and if you take a look at some of the heritage of this engine, the RD-151 and the RD-191 combined have over 10 hr. of test time for their configuration testing," said Mark Pieczynski, Orbital's vice president for space launch strategic development. ...Energomash will deliver the first shipset next summer and a second in the fall of 2015.[/i]
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