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S139 Booster

The S139 is a Solid Rocket Booster manufactured by the Indian Space Research Organisation at the Satish Dhawan Space Centre in the SPROB facility. 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.

Associated rockets
The S139 Booster has been used in 2 major ISRO rockets. It is used in the PSLV as its core stage since 1993. It is also used as a core stage in Geosynchronous Satellite Launch Vehicle MKII rocket. It is also the part of a variant of the Unified Launch Vehicle which is under development. == Gallery ==
Gallery
File:PSLV C-35 at the launch pad (cropped).jpg|The Core stage of the PSLV is the S139 Booster File:PSLV-C44 Integrated upto First Stage inside Mobile Service Tower.jpg| The PS-1 stage with two S12 Solid Rocket Boosters being Integrated with the S139 core stage File:GSLV-F14, INSAT-3DS - Launch Vehicle at Second Launch Pad (SLP).webp|The GSLV-mk.ii also uses the S139 booster as its core stage File:Strap-on motors of GSLV-F05 being integrated with the core stage.jpg|The L40 boosters being integrated with the S139 stage on a GSLV-mk ii == References ==
Source: Wikipedia ↗
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