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Engine Model: S09.502. Designer: Isayev. Developed in: May 1949. Application: R-101 SAM. Propellants: Nitric acid/Amine. Thrust(sl): 78.400 kN (17,625 lbf). Chambers: 4. Country: Russia. Status: Developed 1949-50.

Four chamber engine designed for use in the R-101 (derivative of German Wasserfall). Abandoned by 1950 in favour of single-chamber engine.

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