Author Topic: Orbital ATK make progress toward Return To Flight of Antares rocket  (Read 18453 times)

Offline russianhalo117

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Maybe this is a stupid question, but why is there both an RD-181 designation, and an RD-191 designation? Are these engines significantly different? Or is there an export issue where the engine has to be re-designated?
RD-181 is foreign export version of internal RD-191