S5.92

S5.92

Country of origin	USSR
First flight	1988-07-07
Designer	KB KhIMMASH
Application	Upper Stage
Associated LV	Soyuz, Zenit
Status	In Production
Liquid-fuel engine
Propellant	N2O4 / UDMH
Mixture ratio	2.0
Cycle	Gas Generator
Configuration
Chamber	1
Performance
Thrust, vacuum	19.61 kilonewtons (4,410 lbf)
Chamber pressure	9.61 megapascals (1,394 psi)
Specific impulse, vacuum	327 seconds
Burn time	2,000 seconds
Dimensions
Length	1,028 millimetres (40.5 in)
Diameter	838 millimetres (33.0 in)(max)
Dry mass	75 kilograms (165 lb)
Used in
Fregat and Phobos program
References
References	[1][2][3][4]

The S5.92 is a Russian rocket engine, currently used on the Fregat upper stage. It burns a hypergolic mixture of unsymmetrical dimethylhydrazine (UDMH) fuel with dinitrogen tetroxide (N₂O₄) oxidizer in the gas-generator cycle.

The S5.92 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]

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]

• 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.

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

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