Encyclopedia Astronautica
Block DM-2 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
Russian space tug. 100 launches, (1982) to (2001). Upper stage / space tug - in production. Launched by Proton. Also known as Block DM-2 (different from commercial Block DM2 (no hyphen!)), article number 11S861.

With improved guidance system as compared to 11S86, originally designed for insertion of military spacecraft into geosynchronous orbit. Used from 1982 to present.

Commercial version designated Block DM1 and was equipped with Saab payload adapter for insertion of AS 4000 bus spacecraft into geosynchronous orbit.


Unit Cost $: 4.000 million.

AKA: Block DM; D-1-e.
Gross mass: 17,300 kg (38,100 lb).
Unfuelled mass: 2,300 kg (5,000 lb).
Height: 7.10 m (23.20 ft).
Diameter: 3.70 m (12.10 ft).
Span: 3.70 m (12.10 ft).
Thrust: 85.02 kN (19,113 lbf).
Specific impulse: 352 s.
Number: 100 .

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Associated Propellants
  • Lox/Kerosene Liquid oxygen was the earliest, cheapest, safest, and eventually the preferred oxidiser for large space launchers. Its main drawback is that it is moderately cryogenic, and therefore not suitable for military uses where storage of the fuelled missile and quick launch are required. In January 1953 Rocketdyne commenced the REAP program to develop a number of improvements to the engines being developed for the Navaho and Atlas missiles. Among these was development of a special grade of kerosene suitable for rocket engines. Prior to that any number of rocket propellants derived from petroleum had been used. Goddard had begun with gasoline, and there were experimental engines powered by kerosene, diesel oil, paint thinner, or jet fuel kerosene JP-4 or JP-5. The wide variance in physical properties among fuels of the same class led to the identification of narrow-range petroleum fractions, embodied in 1954 in the standard US kerosene rocket fuel RP-1, covered by Military Specification MIL-R-25576. In Russia, similar specifications were developed for kerosene under the specifications T-1 and RG-1. The Russians also developed a compound of unknown formulation in the 1980's known as 'Sintin', or synthetic kerosene. More...

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