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Engine Model: RD-851. Manufacturer Name: RD-851. Government Designation: 8D63. Designer: Yuzhnoye. Developed in: 1958-63. Application: R-16 (SS-7) stage 1 attitude control engine. Propellants: Nitric acid/UDMH. Thrust(vac): 32.480 kN (7,302 lbf). Isp: 279 sec. Isp (sea level): 243 sec. Burn time: 115 sec. Mass Engine: 403 kg (888 lb). Diameter: 3.54 m (11.61 ft). Length: 1.70 m (5.50 ft). Chambers: 4. Chamber Pressure: 66.20 bar. Oxidizer to Fuel Ratio: 2.45. Thrust to Weight Ratio: 8.21. Country: Ukraine. Status: Out of Production.

Four thrusters are each gimbaled in one single axis.



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