The twenty five and a half hour countdown for the launch of Indian Space Research Organization ISRO's heaviest ever rocket GSLV Mark III D-1 has begun at 3.58 this evening. The most powerful launch vehicle ever developed by the national space agency is set to carry the communication satellite GSAT-19 into a geosynchronous transfer orbit, about 17 minutes after its lift off at 5.28 pm tomorrow. <br/><br/>It is set to blast off from the second launch pad of the Satish Dhawan Space Centre, Sriharikota. The ISRO has said the countdown process is progressing smoothly as per the elaborate plan devised for the first ever developmental flight of the launch vehicle. Currently, the filling of liquid fuel in the second stage of the rocket is going on, as part of the countdown process. <br/><br/>AIR correspondent reports that the GSLV Mark-III D-1 mission assumes greater importance than the previous GSLV flights because the indigenously made heavy thrust cryogenic engine is going to be flight-tested tomorrow. The thrust of the complex engine is 20 tonnes, capable of lifting payloads of upto 4-tons to a geosynchronous transfer orbit. <br/><br/>The design and development of the rocket is a result of the rich experience of the ISRO in handling solid, liquid and cryogenic propulsion technologies. Its predecessor GSLV Mark II has already become flight-proven with four consecutive successes since January 2014.<br/><br/>Once the 640 ton new rocket achieves its mission objectives, it would take India forward as an advanced spacefaring nation moving towards self sufficiency in space technology and application.

The twenty five and a half hour countdown for the launch of Indian Space Research Organization ISRO's heaviest ever rocket GSLV Mark III D-1 has begun at 3.58 this evening.<br/><br/>The most powerful launch vehicle ever developed by the national space agency is set to carry the communication satellite GSAT-19 into a geosynchronous transfer orbit, about 17 minutes after its lift off at 5.28 pm tomorrow. It is set to blast off from the second launch pad of the Satish Dhawan Space Centre, Sriharikota. <br/><br/>The ISRO has said the countdown process is progressing smoothly as per the elaborate plan devised for the first ever developmental flight of the launch vehicle. Currently, the filling of liquid fuel in the second stage of the rocket is going on, as part of the countdown process. AIR correspondent reports that the GSLV Mark-III D-1 mission assumes greater importance than the previous GSLV flights because the indigenously made heavy thrust cryogenic engine is going to be flight-tested tomorrow. <br/><br/>The thrust of the complex engine is 20 tonnes, capable of lifting payloads of upto 4-tons to a geosynchronous transfer orbit. The design and development of the rocket is a result of the rich experience of the ISRO in handling solid, liquid and cryogenic propulsion technologies. <br/><br/>Its predecessor GSLV Mark II has already become flight-proven with four consecutive successes since January 2014. Once the 640 ton new rocket achieves its mission objectives, it would take India forward as an advanced spacefaring nation moving towards self sufficiency in space technology and application.

The twenty five and a half hour countdown for the launch of GSLV Mark III D-1 has begun this evening at Sriharkotta. It began exactly at 3.58 pm at the second launch pad of the national spaceport, precisely as scheduled. <br/><br/>For the 4-ton class GSLV Mark III D-1, it is going to be the first developmental flight tomorrow at 5.28 pm. It is set to put the 'throughput' communication satellite GSAT-19 with a lift of mass of 3136 kg into geosynchronous transfer orbit within 17 minutes of its lift off. It is going to be the heaviest satellite to be launched from within India. <br/><br/>The cryogenic upper stage of the launch vehicle is indigenously made by ISRO scientists. It has a very high thrust enabling the rocket to be a heavy lift vehicle. GSLV Mark III is 43.43 metre long and weighs 640 tons altogether.