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MISSION
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, carries experimental communication satellite, GSAT-1.

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SALIENT FEATURE
  • Overall length
    		• :49 m
  • Lift-off weight
    		• :401 t
  • No. of stages
    		• :3
  • Payload (GSLV-D1)
    		• :GSAT-1 (1530 kg)
  • Orbit (GTO)
    		• :180 x 36,000 km

    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.

    PROPULSIVE STAGES

    FIRST STAGESECOND STAGETHIRD STAGE
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    S125 Stage

    S125 stage is 2.8m in dia. and is made of M250 grade maraging steel and it has a nominal propellant loading of 129t. Each L40’s are loaded with 40t of hypergolic propellants (UDMH & N2O4) stored in two independent tanks of 2.1m dia in tandem and has a pump-fed engine of 680 kN thrust
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    L40 Stage

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    The second stage is 2.8m in dia and is loaded with 37.5t of liquid propellants (UDMH & N2O4 ) in two compartments of an aluminium alloy stage tankage separated by a common bulk head. This has a pump-fed engine of 720 kN thrust.

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    The third stage is 2.8m in dia and uses liquid hydrogen (LH2) and liquid oxygen (LOX) in two separate tanks of aluminium alloy interconnected by an inter-stage structure. Total propellant loading is 12.5t.