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Model: UR-500 Stage 3. Gross Mass: 23,940 kg (52,770 lb). Empty Mass: 2,180 kg (4,800 lb). Thrust (vac): 613.110 kN (137,833 lbf). Isp: 320 sec. Burn time: 110 sec. Propellants: N2O4/UDMH. Diameter: 4.10 m (13.40 ft). Span: 4.10 m (13.40 ft). Length: 3.70 m (12.10 ft). Country: USSR. No Engines: 1. Motor: RD-0212. Status: Design 1962.

Original Proton third stage design.

Model: Proton K-3. Gross Mass: 50,747 kg (111,877 lb). Empty Mass: 4,185 kg (9,226 lb). Thrust (vac): 630.170 kN (141,668 lbf). Isp: 325 sec. Burn time: 238 sec. Propellants: N2O4/UDMH. Isp(sl): 230 sec. Diameter: 4.15 m (13.61 ft). Span: 4.15 m (13.61 ft). Length: 6.50 m (21.30 ft). Country: Russia. No Engines: 1. Motor: RD-0212. Status: Active. Cost $ : 3.000 million. First Flight: 1967. Last Flight: 2003. No Launched: 172.

Model: Proton KM-3. Gross Mass: 50,300 kg (110,800 lb). Empty Mass: 3,700 kg (8,100 lb). Thrust (vac): 613.800 kN (137,988 lbf). Isp: 327 sec. Burn time: 230 sec. Propellants: N2O4/UDMH. Diameter: 4.15 m (13.61 ft). Span: 4.15 m (13.61 ft). Length: 6.90 m (22.60 ft). Country: Russia. No Engines: 1. Motor: RD-0212. Status: Active. First Flight: 2001. Last Flight: 2008. No Launched: 20.

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