Engine Model: R-13. Designer: Dushkin. Developed in: 1946-. Propellants: Nitric acid/Solid. Country: Russia. Status: Out of Production. The R-13 engine was developed in the late 1950s by OKB Dushkin. It was a combined (powder+liquid) engine, characterized by a new technical approach conceived by Dushkin in the prewar design of the KRD-604.