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RD-253 engine

Credit - Khrunichev
Model: UR-500 Polyblock Stage 1P. Gross Mass: 378,900 kg (835,300 lb). Empty Mass: 26,900 kg (59,300 lb). Thrust (vac): 8,989.700 kN (2,020,965 lbf). Isp: 310 sec. Burn time: 119 sec. Propellants: N2O4/UDMH. Isp(sl): 280 sec. Diameter: 4.10 m (13.40 ft). Span: 7.40 m (24.20 ft). Length: 21.20 m (69.50 ft). Country: USSR. No Engines: 4. Motor: 8D43 + 11D43. Status: Design 1962.

Original 'Polyblock' design for Proton first stage. This was selected configuration; although somewhat greater in dry mass, it had the advantages of shorter length.

Model: UR-500 Monoblok Stage 1M. Gross Mass: 367,360 kg (809,890 lb). Empty Mass: 25,560 kg (56,350 lb). Thrust (vac): 8,989.700 kN (2,020,965 lbf). Isp: 310 sec. Burn time: 115 sec. Propellants: N2O4/UDMH. Isp(sl): 280 sec. Diameter: 6.20 m (20.30 ft). Span: 6.20 m (20.30 ft). Length: 30.00 m (98.00 ft). Country: USSR. No Engines: 4. Motor: 8D43 + 11D43. Status: Design 1962.

Original conventional 'Monoblock' design for Proton first stage.

Model: Proton K-1. Gross Mass: 450,510 kg (993,200 lb). Empty Mass: 31,100 kg (68,500 lb). Thrust (vac): 10,470.158 kN (2,353,785 lbf). Isp: 316 sec. Burn time: 124 sec. Propellants: N2O4/UDMH. Isp(sl): 267 sec. Diameter: 4.15 m (13.61 ft). Span: 7.40 m (24.20 ft). Length: 21.20 m (69.50 ft). Country: Russia. No Engines: 6. Motor: RD-253-11D48. Status: Active. Cost $ : 18.000 million. First Flight: 1965. Last Flight: 2007. No Launched: 392. No Failed: 11. Other designations: 8S810K.

Model: Proton KM-1. Gross Mass: 450,400 kg (992,900 lb). Empty Mass: 31,000 kg (68,000 lb). Thrust (vac): 10,532.000 kN (2,367,687 lbf). Isp: 317 sec. Burn time: 108 sec. Propellants: N2O4/UDMH. Isp(sl): 285 sec. Diameter: 7.40 m (24.20 ft). Span: 7.40 m (24.20 ft). Length: 21.00 m (68.00 ft). Country: Russia. No Engines: 6. Motor: RD-253-14D14. Status: Active. Cost $ : 18.000 million. First Flight: 1999. Last Flight: 2008. No Launched: 26.

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