Kosberg N2O4/UDMH rocket engine. UR-100N / RS-18 (SS-19) stage 2. Main engine based on RD-0217 with larger nozzle for altitude operation. Staged combustion cycle. First flight 1972.
Date: 1969-74. Number: 315 . Thrust: 240.00 kN (53,950 lbf). Specific impulse: 320 s.