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Designed 1965-1971 as replacement for N-1 Blok D. Cancelled 1971 in favor of Blok Sr; revived and developed in 1974-1976. First static test Oct 12 1976. Two stages tested 1976-1977. Strangely never replaced Blok D on Proton. Model: Proton KM-4. Gross Mass: 19,500 kg (42,900 lb). Empty Mass: 3,000 kg (6,600 lb). Thrust (vac): 73.579 kN (16,541 lbf). Isp: 461 sec. Burn time: 780 sec. Propellants: Lox/LH2. Diameter: 3.80 m (12.40 ft). Span: 3.80 m (12.40 ft). Length: 7.00 m (22.90 ft). Country: Russia. No Engines: 1. Motor: RD-56M. Status: Development 1992. Cost $ : 30.000 million. First Flight: 1995. Planned version for Proton. Never developed. Model: GSLV-3. Gross Mass: 14,600 kg (32,100 lb). Empty Mass: 2,200 kg (4,800 lb). Thrust (vac): 75.050 kN (16,872 lbf). Isp: 460 sec. Burn time: 675 sec. Propellants: Lox/LH2. Diameter: 2.80 m (9.10 ft). Span: 2.80 m (9.10 ft). Length: 8.72 m (28.60 ft). Country: India. No Engines: 1. Motor: RD-56M. Status: Active. First Flight: 2001. Last Flight: 2006. No Launched: 4. Other designations: Geostationary Satellite Launch Vehicle. The stage finally reached hardware status as a joint Russian-Indian development for India's GSLV booster. Model: Angara KVRB. Gross Mass: 23,300 kg (51,300 lb). Empty Mass: 3,500 kg (7,700 lb). Thrust (vac): 73.500 kN (16,523 lbf). Isp: 461 sec. Propellants: Lox/LH2. Diameter: 4.10 m (13.40 ft). Span: 4.10 m (13.40 ft). Length: 8.60 m (28.20 ft). Country: Russia. No Engines: 1. Motor: RD-56M. Status: In development. Planned version for Angara. 5 restarts. Used on Launch Vehicles:
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