| Manufacturer | Satish Dhawan Space Centre |
|---|---|
| Country of origin | India |
| Used on | GSLV and PSLV |
| General characteristics | |
| Height | 20m-PSLV 20.2m-GSLV |
| Diameter | 2.8m |
| Propellant mass | 138,200 kg 138.2 metric tonnes |
| Empty mass | 30,200 kg (66,600 lb). |
| Launch history | |
| Status | Active |
| First flight | Sep 20, 1993 |
| S139 | |
| Maximum thrust | 4,846.9 kN (1,089,600 lbf) |
| Specific impulse | 237 s (2.32 km/s) (sea level) 269 s (2.64 km/s) (vacuum) |
| Burn time | 110 seconds (PSLV) 100 seconds (GSLV) |
| Propellant | HTPB |
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.
The S139 Booster has been used in 2 major ISRO rockets.
It is used in the PSLV as its core stage since 1993. [2]
It is also used as a core stage in Geosynchronous Satellite Launch Vehicle MKII rocket. [3]
It is also the part of a variant of the Unified Launch Vehicle which is under development. [4]
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