About ISRO ISRO Centres Programmes Decade Plan Space Science International Sponsored Research Space Services Antrix Corporation Training Facilities Press Release   Geosynchronous Satellite Launch Vehicle (GSLV)   GSLV is under development for launching 2500 kg INSAT class of satellite into geosynchronous transfer orbit. While the initial flights will have cryogenic upper stage supplied by Russia, ISRO is developing indigeneous cryogenic stage for use in subseqent flights. Lift-off mass (t) : 401t Height (m) : 49m Heatshield : Diameter : 3.40m, Length : 7.8m, Dynamic envelope : 3.05m   First Stage (GS-1) S125 booster L40 strapon Second Stage (GS-2) Third Stage (GS-3)   Propulsion Solid Liquid Liquid Cryogenic Lenght(m) 20 19.7 11.6 8.7 Diameter(m) 2.8 2.1 2.8 2.8 Total Mass (tonnes) 157.3 45.6 43.0 15.0 Propellent Mass (Tonnes) 129 40 37.5 12.5 Case/Tank Material M250 Steel 45 Aluminium Aluminium Aluminium Propellent HTPB 1.0 UDMH & N204 UDMH & N204 LH2 & LOX Stage Length(m) 20 10 12.5 3.6 2.1 Control SITVC for Pitch & Yaw, Reaction control Thrusters for roll. SITVC in 2 PSOMs for roll control augmentation Engine Gimbal for Pitch & Yaw, Hot Gas Reaction Control Motor for roll control Flex Nozzle for Pitch & Yaw, PS4 RCS for roll control Engine Gimbal for Pitch, Yaw and roll On -off RCS for coast phase controll