Geosynchronous Satellite Launch Vehicle Mk III
The GSLV-III or Geosynchronous Satellite Launch Vehicle mark III is a launch vehicle currently under development by the Indian Space Research Organization. It is intended to launch heavy satellites into geostationary orbit, and will allow India to become less dependent on foreign rockets for heavy lifting.
The rocket is the technological successor to the GSLV, however is not derived from its predecessor. The GSLV-I has a Russian-made cryogenic third stage, which was to be replaced with an identical Indian-built one for the GSLV-II. US objections based on the Missile Technology Control Regime (MTCR) prevented the Russia-India technology transfer that would have enabled this. The maiden flight is scheduled to take place in 2012.
The boosters used on the GSLV-III will be the S-200, which is also designated Large Solid Booster, or LSB, which is a solid propellant stage with a mass of 200 tonnes. Two boosters will be used. Each has a diameter of 3.2 metres and a length of 25 metres. Each booster generates 560 tonnes-force (5.50 MN) of thrust at lift-off.
Core stage :
The core stage will be the L-110 restartable liquid stage which has 110 tonnes of liquid propellant and a diameter of 4-metres. It will be the first Indian liquid engine cluster design, and will use two improved Vikas engines, each producing 75 tonnes (735 kN) of thrust. The improved Vikas engine will use regenerative cooling, providing improved weight and specific impulse, compared to earlier rockets. L110 is one of the heaviest earth storable liquid stages ever developed by ISRO.
Upper stage :
The upper stage will be the C-25, powered by the CE-20 engine, fueled by 25 tonnes of LOX+LH2. It has a 4-metre diameter and is 8.2 metres long. The stage will produce 20 tonnes (197 kN) of thrust.
Payload fairing :
The payload fairing will have a diameter of 5 metre and a payload volume of 100 cubic metre