S5.92

N₂O₄ / UDMHMixture ratio2.0CycleGas GeneratorConfigurationChamber1PerformanceThrust, vacuum19.61 kilonewtons (4,410 lbf)Chamber pressure9.61 megapascals (1,394 psi)Specific impulse, vacuum327 secondsBurn time2,000 secondsDimensionsLength1,028 millimetres (40.5 in)Diameter838 millimetres (33.0 in)(max)Dry weight75 kilograms (165 lb)Used inFregat and Phobos programReferencesReferences^[1][2][3][4]

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

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

External links

• KB KhIMMASH Official Page (in Russian) Archived 2016-03-20 at the Wayback Machine
• NPO Lavochkin Fregat Page (in Russian)