Engine Model: 17D12. Government Designation: 17D12. Designer: Korolev. Developed in: 1976-88. Application: Buran OMS. Propellants: Lox/Kerosene. Thrust(vac): 86.300 kN (19,401 lbf). Isp: 362 sec. Burn time: 680 sec. Mass Engine: 230 kg (500 lb). Diameter: 1.17 m (3.83 ft). Length: 2.27 m (7.44 ft). Chambers: 1. Chamber Pressure: 79.40 bar. Area Ratio: 189.00. Oxidizer to Fuel Ratio: 2.42. Thrust to Weight Ratio: 38.26. Country: Russia. Status: Out of Production. Version of RD-58 for Buran orbital propulsion system 17D11. Uses synthetic kerosene ('Sintin') for higher specific impulse. Some data differ for 17D12 in Energia 92 compared to RD-58S (Energia 92): Area Ratio 192, Ivac 362 s, pc 78.5 bar. 15 ignitions.