| Manufacturer | Satish Dhawan Space Centre |
|---|---|
| Country of origin | India |
| Used on | GSLV and PSLV |
| General characteristics | |
| Diameter | 2.8m |
| Propellant mass | 138 tonnes |
| Launch history | |
| Status | Active |
| First flight | Sep 20, 1993 |
| Last flight | Jul 30, 2023 |
The S139 (S for Solid, 139 for weight of 139 tonnes) is a Solid Rocket Booster manufactured by the Indian Space Research Organisation at the Satish Dhawan Space Centre in the SPROB facility.[1] The rocket motor was first developed for use in the Polar Satellite Launch Vehicle. Later it was utilised in the GSLV MKII. It uses hydroxyl-terminated polybutadiene (HTPB) as a propellant. It has a maximum thrust of 4800 kN.
- ^ "ISRO to increase production of solid booster engines to make more powerful rockets". Tech2. 2018-11-29. Retrieved 2021-08-09.
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