Stages in GSLV
The first stage comprises S139 solid booster with 138-tonne propellant and four liquid strap-on motors, with 40-tonne propellant. The second stage is a liquid engine carrying 40-tonne of liquid propellant. The third stage is the indigenously built Cryogenic Upper Stage (CUS) carrying 15-tonne of cryogenic propellants.
GSLV rockets using the Russian Cryogenic Stage (CS) are designated as the GSLV Mk I while versions using the indigenous Cryogenic Upper Stage (CUS) are designated the GSLV Mk II. All GSLV launches have been conducted from the Satish Dhawan Space Centre in Sriharikota.
Difference between PSLV and GSLV
GSLV has the capability to put a heavier payload in the orbit than the Polar Satellite Launch Vehicle (PSLV). PSLV can carry satellites up to a total weight of 2000 kg into space and reach up to an altitude of 600-900 km. GSLV can carry weight up to 5,000 kg and reach up to 36,000 km.
PSLV is designed mainly to deliver earth observation or remote sensing satellites, whereas, GSLV has been designed for launching communication satellites. GSLV delivers satellites into a higher elliptical orbit, Geosynchronous Transfer Orbit (GTO) and Geosynchronous Earth Orbit (GEO).
GSLV Launches
Isro first launched GSLV on April 18, 2001 and has made 13 launches since then. The GSLV has had 8 launches successfully reaching its planned orbits, three outright failures and two partial failure, yielding a success rate for GSLV Mk I at 29% and 86% for Mk II. All launches have taken place from the Satish Dhawan Space Centre, known before 2002 as the Sriharikota Range (SHAR).
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