Encyclopedia Astronautica
11D79


Stepanov N2O4/UDMH rocket engine. 44 kN. Blok D SOZ. In Production. Thrust 1.1-4.5 tf variable.

Application: Blok D SOZ.

Status: In Production.
Thrust: 44.00 kN (9,891 lbf).
First Launch: 1964-67.

More... - Chronology...


Associated Countries
See also
Associated Manufacturers and Agencies
  • Stepanov Russian manufacturer of rocket engines. Stepanov Design Bureau, Russia. More...

Associated Propellants
  • N2O4/UDMH Nitrogen tetroxide became the storable liquid propellant of choice from the late 1950's. Unsymmetrical Dimethylhydrazine ((CH3)2NNH2) became the storable liquid fuel of choice by the mid-1950's. Development of UDMH in the Soviet Union began in 1949. It is used in virtually all storable liquid rocket engines except for some orbital manoeuvring engines in the United States, where MMH has been preferred due to a slightly higher density and performance. More...

Associated Stages
  • N1 Block D Lox/Kerosene propellant rocket stage. Loaded/empty mass 18,200/3,500 kg. Thrust 83.30 kN. Vacuum specific impulse 349 seconds. Block D as originally designed as a lunar crasher stage More...
  • Proton 11S824M Lox/Kerosene propellant rocket stage. Loaded/empty mass 14,000/1,830 kg. Thrust 85.02 kN. Vacuum specific impulse 352 seconds. Also known as Block D-1; article number 11S824M. Without guidance unit (navigation commands come from payload). Successor to 11S824. Used to launch large Lavochkin bureau unmanned lunar/planetary/high earth orbit spacecraft from 1976 to 1989. More...
  • Proton 17S40 Lox/Kerosene propellant rocket stage. Loaded/empty mass 14,600/3,300 kg. Thrust 85.02 kN. Vacuum specific impulse 352 seconds. Also known as Block DM-5. Commercial version is Block DM2, with Iridium dispenser, designed for insertion of multiple LM 700 (Iridium) spacecraft into medium earth orbit. With guidance unit, modification of 11S861 stage for heavier payloads and with different payload adapter. More...
  • Proton 11S861-01 Lox/Kerosene propellant rocket stage. Loaded/empty mass 18,650/2,650 kg. Thrust 83.45 kN. Vacuum specific impulse 361 seconds. Also known as Block DM-2M, article number 11S861-01. 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.. With guidance unit, originally designed for insertion of military spacecraft into geosynchonous orbit. Capable of boosting heavier payloads than 11S861 through use of higher-performance 'sintin' synthetic kerosene fuel. More...
  • Proton 11S86 Lox/Kerosene propellant rocket stage. Loaded/empty mass 17,550/2,300 kg. Thrust 85.02 kN. Vacuum specific impulse 352 seconds. Also known as Block DM; article number 11S86. With guidance unit, designed for insertion of military spacecraft into geosynchonous/ medium earth orbit. Used from 1974 to 1990. Succeeded by 11S861. More...
  • Proton 11S824F Lox/Kerosene propellant rocket stage. Loaded/empty mass 16,900/1,800 kg. Thrust 85.02 kN. Vacuum specific impulse 352 seconds. Also known as Block D-2; article number 11S824F. Without guidance unit (navigation commands come from payload). Successor to 11S824M. Used for launch of Lavochkin Mars-bound spacecraft in 1988 and 1996. More...
  • Proton 11S824 Lox/Kerosene propellant rocket stage. Loaded/empty mass 13,360/1,800 kg. Thrust 83.30 kN. Vacuum specific impulse 346 seconds. Originally designed as N1-L3 lunar expedition launch vehicle lunar orbit insertion/lunar crasher stage. Before it could fly on the N1, it was adapted for use with Proton UR-500K as a fourth stage for manned circumlunar flight. It was then further used to launch large Lavochkin bureau unmanned lunar/planetary spacecraft. In the 1970's it was adopted by the Soviet military and standardized for launch of geostationary satellites. More...
  • Proton 11S861 Lox/Kerosene propellant rocket stage. Loaded/empty mass 17,300/2,300 kg. Thrust 85.02 kN. Vacuum specific impulse 352 seconds. 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. More...

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