The Geosynchronous Satellite Launch Vehicle Mark III (GSLV MkIII) also known as LVM3, is the next generation launcher being developed by ISRO for achieving self reliance in the launch of 4 ton class of communication satellites to Geosynchronous Transfer Orbits (GTO). The launcher is designed to be a versatile launcher to launch payloads to other orbits as well and will have a payload capability in excess of 10 ton to Low Earth Orbits (LEO). Once GSLV-MkIII becomes operational, India would be able to dispense the procured launches for 4 ton class communication satellites.
LVM3 is designed to be a 43.4 m tall, three stage vehicle with a lift off mass of 640 ton. Two identical large solid boosters, each with 200 ton solid propellant provide the initial thrust for lift off. The 200 ton solid booster (S200) developed for this programme is one of the largest solid boosters in the world. The solid boosters are strapped on to the core liquid stage (L110), which carries 110 ton liquid propellant in a twin engine configuration. The new indigenous cryogenic upper stage (C25) being developed will form the third stage and will carry 27 tons of cryogenic propellants. The payload fairing will have a diameter of 5 m to accommodate larger payloads. The first experimental flight of LVM3, carrying the CARE payload, lifted off from Sriharikota on December 18, 2014 and successfully tested the atmospheric phase of flight. LVM3-X vehicle had an external configuration identical to the generic vehicle and had fully functional S200 and L110 stages. The cryogenic upper stage was passive with a non-firing cryo engine.