Proton K-1
RD-253 engine

Credit - Khrunichev
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. Engine: RD-253-11D48. Cost $ : 18.000 million. First Flight: 1965. Last Flight: 2006. No Launched: 306. No Failed: 11. Other designations: 8S810K.

Used on Launch Vehicles:  
 
 
 
 
 
 
 
 
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