N1 Block Sr
Blok SR

Credit - RKK Energia
Gross Mass: 77,900 kg (171,700 lb). Empty Mass: 11,500 kg (25,300 lb). Thrust (vac): 147.880 kN (33,245 lbf). Isp: 441 sec. Burn time: 1,910 sec. Propellants: Lox/LH2. Diameter: 5.20 m (17.00 ft). Span: 5.20 m (17.00 ft). Length: 16.50 m (54.10 ft). Country: Russia. No Engines: 2. Engine: RD-56M. Status: Development ended 1974.

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 tonnes into lunar orbit or 20 tonnes into geosynch orbit.

Used on Launch Vehicles:  
 
 
 
 
 
 
 
 
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