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Model: N1 Block S. Gross Mass: 58,000 kg (127,000 lb). Empty Mass: 8,000 kg (17,600 lb). Thrust (vac): 392.000 kN (88,125 lbf). Isp: 440 sec. Burn time: 540 sec. Propellants: Lox/LH2. Diameter: 6.70 m (21.90 ft). Span: 6.70 m (21.90 ft). Length: 16.00 m (52.00 ft). Country: Russia. No Engines: 1. Motor: RD-57. Status: Development ended 1971. First Flight: 1967. Last Flight: 1973. No Launched: 3. Designed 1965-1971 as replacement for N-1 Blok G. Cancelled in 1971 in favor of development of single stage, Block Sr. Used on Launch Vehicles:
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