S5.92

The S5.92 is a Russian rocket engine, currently used on the Fregat upper stage.

S5.92
Country of originUSSR
First flight1988-07-07
DesignerKB KhIMMASH
ApplicationUpper Stage
Associated L/VSoyuz, Zenit
StatusIn Production
Liquid-fuel engine
PropellantN
2O
4 / UDMH
Mixture ratio2.0
CycleGas Generator
Configuration
Chamber1
Performance
Thrust (vac.)19.61 kilonewtons (4,410 lbf)
Chamber pressure9.61 megapascals (1,394 psi)
Isp (vac.)327 seconds
Burn time2,000 seconds
Dimensions
Length1,028 millimetres (40.5 in)
Diameter838 millimetres (33.0 in)(max)
Dry weight75 kilograms (165 lb)
Used in
Fregat and Phobos program
References
References[1][2][3][4]

Design

S5.92 burns a hypergolic mixture of UDMH and nitrogen tetroxide in the gas-generator cycle. It has two throttle settings. The highest produces 19.61 kilonewtons (4,410 lbf) of thrust, a specific impulse of 327 seconds, and a 3-second ignition transient. The lower throttle level produces 13.73 kilonewtons (3,090 lbf) of thrust, specific impulse of 316 seconds, and a 2.5 second ignition transient. It is rated for 50 ignitions, and 300 days between ignitions.[1]

History

It was originally designed by the famous A.M. Isayev Chemical Engineering Design Bureau, for the two spacecraft of the Phobos program. While the Mars missions were unsuccessful, the spacecraft manufacturer, NPO Lavochkin, found a market niche for the technology. Thus, the engine was adapted for use on the optional Fregat upper stage of the Soyuz and Zenit launch vehicles.[1][4]

See also
  • Fregat - The upper stage that is powered by the S5.92.
  • Soyuz - A medium lift rocket that uses the Fregat stage.
  • Zenit-3F - A heavy lift rocket that uses the Fregat stage.

References
  1. "Engines S5.221 and S5.92. The upper stage Fregat" (in Russian). KB Khimmash. Retrieved 2015-06-02.
  2. "KVD-1 & S5.92 Brochure" (PDF). KB KhIMMASH. 1998-10-13. Retrieved 2015-08-03.
  3. Brügge, Norbert. "Spacecraft-propulsion blocks (KDU) from Isayev's design bureau (now Khimmash)". B14643.de. Archived from the original on 2015-06-02. Retrieved 2015-06-02.
  4. Zak, Anatoly. "Fregat space tug". RussianSpaceWeb. Retrieved 2015-06-02.


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