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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.
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.
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PROPULSIVE STAGES
FIRST STAGE SECOND STAGE THIRD STAGE
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
L40 Stage
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.
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.
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