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Manufacturer Name: RD-861G. Government Designation: 11D25G. Designer: Yuzhnoye + Fiat Avio. Developed in: 1996-. Application: Vega upper stage. Propellants: N2O4/UDMH Thrust(vac): 7,796 kgf. Thrust(vac): 76.45 kN. Isp: 325 sec. Burn time: 400 sec. Mass Engine: 185 kg. Length: 1.7 m. Chambers: 1 + 4 + 2. Chamber Pressure: 88.80 bar. Area Ratio: 112.40. Oxidizer to Fuel Ratio: 2.41. Country: Ukraine + Italy. Status: Developed 1996-. References: 326 . Comments: Proposed uprate of RD-861 engine. Thrust vector control by gimbal, roll control by 4 nozzles (thrust 29 N each) and new arrangement of turbine exhaust lines for improved performance.
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Last update 12 March 2001.
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