| Block DM-2M 11S861-01 | ||
Upper stage / space tug - in production. Launched by Proton. Also known as Block DM-2M, article number 11S861-01. With guidance unit, originally designed for insertion of military spacecraft into geosynchronous orbit. Commercial versions are Block DM3, with Saab payload dispenser, for insertion of Hughes HS 601 bus spacecraft into geosynchronous orbit; and Block DM4, for insertion of FS-1300 bus spacecraft into geosynchronous orbit. Capable of boosting heavier payloads than 11S861 through use of higher-performance 'sintin' synthetic kerosene fuel. Version used synthetic kerosene ('Sintin') for higher specific impulse. Unit Cost $: 4.000 million. Length: 7.10 m (23.20 ft). Basic Diameter: 3.70 m (12.10 ft). Span: 3.70 m (12.10 ft). Mass: 18,650 kg (41,110 lb). Main Engine: RD-58S. Main Engine: 230 kg (500 lb). Main Engine Thrust: 83.450 kN (18,760 lbf). Main Engine Propellants: Lox/Kerosene. Main Engine Propellants: 16,000 kg (35,000 lb). Main Engine Isp: 361 sec.
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