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 - 2007 except where otherwise noted.

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