Engineering:S139 Booster

S139

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
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)
Fuel	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. 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

• 
  The Core stage of the PSLV is the S139 Booster
• 
  The PS-1 stage with two S12 Solid Rocket Boosters being Integrated with the S139 core stage
• 
  The GSLV-mk.ii also uses the S139 booster as its core stage
• 
  The L40 boosters being integrated with the S139 stage on a GSLV-mk ii