GSLV-D1 / GSAT-1
The Geo-synchronous Satellite Launch Vehicle (GSLV) is designed to place satellites in Geo-Synchronous Transfer Orbit (GTO). It adopts the flight-proven solid and liquid stages of ISRO’s Polar Satellite Launch Vehicle (PSLV) and a cryogenic upper stage. The first development flight, GSLV-D1, carried experimental communication satellite, GSAT-1.
GSLV is a three stage vehicle, 49m tall. The first stage, GS1, comprises a solid propellant motor (S125) and four liquid propellant strap-on stages(L40). The second stage (GS2) is powered by a single liquid propellant engine (L37.5). The third stage (GS3) is a cryogenic stage (C12) with re-startable engines.
|Parameter||GS1 Stage (First Stage)||GS2 stage
|S125 booster||L40 strapon|
|Total mass (t)||156||46||42.8||15|
|Propellant mass (t)||129||40||38||12.5|
|Case/Tank material||M250 steel||Aluminium Alloy||Aluminium Alloy||Aluminium Alloy|
|Propellant||HTPB||UDMH & N2O4||UDMH & N2O4||LH2 & LOX|
|Burn time (s)||100||160||150||720|
|Max. Vac. Thrust (kN)||4700||680||720||73.5|
|Specific impulse (Ns/kg)||2610||2750||2890||4510|
|Control system||Multi-port SITVC||EGC single plane gimballing||EGC two plane gimballing for pitch & yaw control. Hot gas RCS for roll control.||2 steering engines for thrust phase control & cold gas RCS for coast phase control.|