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RD-191
NPO Energomash / Proton-PM (in transition) · liquid · Russia · Modern (1992–2009)
The RD-191 is a high-performance single-combustion chamber rocket engine, developed in Russia and sold by Roscosmos. It is derived from the RD-180 dual-combustion chamber engine, which itself was derived in turn from the four-chamber RD-170 originally used in the Energia launcher.