Encyclopedia Astronautica
S-3-20M5A


Dushkin Nitric acid/Kerosene rocket engine. U-21. Developed -1959. Launch thrust 29.4 kN.

Application: U-21.

Thrust (sl): 29.400 kN (6,609 lbf). Thrust (sl): 3,000 kgf.

Status: Developed -1959.
Thrust: 29.40 kN (6,609 lbf).
First Launch: -1959.

More... - Chronology...


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

Associated Propellants
  • Nitric acid/Kerosene Drawing on the German World War II Wasserfall rocket, nitric acid (HNO3) became the early storable oxidiser of choice for missiles and upper stages of the 1950's. To overcome various problems with its use, it was necessary to combine the nitric acid with N2O4 and passivation compounds. These formulae were considered extremely secret at the time. By the late 1950's it was apparent that N2O4 by itself was a better oxidiser. Therefore nitric acid was almost entirely replaced by pure N2O4 in storable liquid fuel rocket engines developed after 1960. Rocket propellant RP-1, or its foreign equivalents, is a straight-run kerosene fraction, which is subjected to further treatment, i.e., acid washing, sulphur dioxide extraction. Thus, unsaturated substances which polymerise in storage are removed, as are sulphur-containing hydrocarbons. More...

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