Isayev DOS-3/4

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Engine Model: Isayev DOS-3/4. Designer: Isayev. Developed in: 1972-74. Application: DOS-3/4. Propellants: Nitric acid/UDMH. Thrust(vac): 3.920 kN (881 lbf). Country: Russia. Status: Out of Production. Contact us with any corrections, additions, or comments. Conditions for use of drawings, pictures, or other materials from this site.. To contact astronauts or cosmonauts. © Mark Wade, 1997 - 2008 except where otherwise noted.