Orbital Sciences Corp. will buy directly from Russia’s NPO Energomash a new rocket engine with a long heritage, to replace the surplus Russian powerplants tentatively implicated in the Oct. 28 failure of an Antares launch vehicle with a load of cargo for the International Space Station (ISS). 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 ...

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