N1 Block Sr

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N1 Block Sr

Part of N1 Block S

Blok SR
Credit: RKK Energia

LOx/LH2 propellant rocket stage. Upper stage developed 1971-1974 to support manned lunar expedition. Replaced Blok R/Blok S previously under development. Capable of five restarts and 11 days of flight. Could insert 24 metric tons into lunar orbit or 20 metric tons into geosynchronous orbit.

Status: Development ended 1974. Thrust: 147.88 kN (33,245 lbf). Gross mass: 77,900 kg (171,700 lb). Unfuelled mass: 11,500 kg (25,300 lb). Specific impulse: 441 s. Burn time: 1,910 s. Height: 16.50 m (54.10 ft). Diameter: 5.20 m (17.00 ft). Span: 5.20 m (17.00 ft).

No Engines: 2.

Family: Space Tugs. Country: Russia. Engines: RD-56M. Launch Vehicles: N1F Sr. Propellants: Lox/LH2.

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