Engine Model: RD-0139. Manufacturer Name: RD-0139. Designer: Kosberg. Developed in: 1998-. Application: stage 1. Propellants: Lox/LNG. Thrust(vac): 2,038.000 kN (458,160 lbf). Isp: 341 sec. Isp (sea level): 301 sec. Mass Engine: 1,544 kg (3,403 lb). Length: 3.61 m (11.84 ft). Chambers: 1. Thrust to Weight Ratio: 134.58. Country: Russia. Status: Developed 1998-on. Proposed engine for LOX/liquid natural gas. Gas generator cycle with turbine gas injection into supersonic nozzle.
Bibliography:- Novosti kosmonavtiki, Issue 3, 1999.