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RD-261

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Status: In production. Date: 1967-69. Number: 121 . Thrust: 3,032.00 kN (681,620 lbf). Unfuelled mass: 1,764 kg (3,888 lb). Specific impulse: 301 s. Specific impulse sea level: 270 s. Burn time: 120 s. Height: 1.76 m (5.78 ft). Diameter: 0.75 m (2.44 ft).

Chambers: 6. Engine: 1,764 kg (3,888 lb). Chamber Pressure: 83.00 bar. Area Ratio: 14.7. Thrust to Weight Ratio: 175.27. Oxidizer to Fuel Ratio: 2.6.