Proton 11S861
Engine 11D68 detail
Close-up view of the 11D68 Block D lunar crasher stage showing detail of the BOZ orientation/ullage thrusters that control the stage during coast, restart, and manoeuvre.
Credit - © Mark Wade
Gross Mass: 17,300 kg (38,100 lb). Empty Mass: 2,300 kg (5,000 lb). Thrust (vac): 85.020 kN (19,113 lbf). Isp: 352 sec. Burn time: 600 sec. Propellants: Lox/Kerosene. Diameter: 3.70 m (12.10 ft). Span: 3.70 m (12.10 ft). Length: 7.10 m (23.20 ft). Country: Russia. No Engines: 1. Engine: RD-58M. Cost $ : 4.000 million. First Flight: 1982. Last Flight: 2005. No Launched: 103. No Failed: 3. Other designations: Block DM; D-1-e.

Also known as Block DM-2 (different from commercial Block DM2 (no hyphen!)), article number 11S861. Commercial version designated Block DM1 and is equipped with Saab payload adapter for insertion of AS 4000 bus spacecraft into geosynchronous orbit. With improved guidance system as compared to 11S86, originally designed for insertion of military spacecraft into geosynchonous orbit. Used from 1982 to present.

Used on Launch Vehicles:  
 
 
 
 
 
 
 
 
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