Encyclopedia Astronautica
Proton-K/DM-2M DM4


Russian orbital launch vehicle. Version of the 11S861-01 with Saab payload adapter-seperation system for insertion of FS-1300 bus spacecraft into geosynchronous orbit.

LEO Payload: 5,000 kg (11,000 lb). Payload: 4,350 kg (9,590 lb) to a GTO.

Gross mass: 691,500 kg (1,524,400 lb).
Payload: 5,000 kg (11,000 lb).
Height: 57.20 m (187.60 ft).
Diameter: 4.15 m (13.61 ft).
Span: 7.40 m (24.20 ft).
Thrust: 9,500.00 kN (2,135,600 lbf).
Apogee: 40,000 km (24,000 mi).

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Associated Countries
Associated Engines
  • RD-58S Korolev Lox/Kerosene rocket engine. 86.3 kN. Proton 8K82K / 11S861-01 stage 4 (block DM). Version 17D12 for Buran OMS. Version uses synthetic kerosene ('Sintin') for higher specific impulse. Isp=361s. First flight 1994. More...

See also
  • Proton The Proton launch vehicle has been the medium-lift workhorse of the Soviet and Russian space programs for over forty years. Although constantly criticized within Russia for its use of toxic and ecologically-damaging storable liquid propellants, it has out-lasted all challengers, and no replacement is in sight. More...

Associated Manufacturers and Agencies
  • Chelomei Russian manufacturer of rockets, spacecraft, and rocket engines. Chelomei Design Bureau, Reutov, Russia. More...

Associated Stages
  • Proton K-2 N2O4/UDMH propellant rocket stage. Loaded/empty mass 167,828/11,715 kg. Thrust 2,399.22 kN. Vacuum specific impulse 327 seconds. More...
  • Proton K-1 N2O4/UDMH propellant rocket stage. Loaded/empty mass 450,510/31,100 kg. Thrust 10,470.16 kN. Vacuum specific impulse 316 seconds. 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 K-3 N2O4/UDMH propellant rocket stage. Loaded/empty mass 50,747/4,185 kg. Thrust 630.17 kN. Vacuum specific impulse 325 seconds. More...

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