S200 Strap-ons Integrated with Core L110 Liquid Stage (Photo: ISRO)
S200 Strap-ons Integrated with Core L110 Liquid Stage (Photo: ISRO)

ISRO New Workhorse GSLV-Mk III to Carry Heaviest 3136-kg GSAT-19 Satellite

ISRO New Workhorse GSLV-Mk III-D1 to Carry Heaviest 3136-kg GSAT-19 Satellite
Indian Space research Organisation (ISRO) will launch its new workhorse GSLV-Mk III-D1 rocket on June 5, making it the heaviest rocket ever made by ISRO and capable of carrying huge payloads.

GSAT-19 carries Ka/Ku-band high throughput communication transponders, a Geostationary Radiation Spectrometer (GRASP) to monitor charged particles and the space radiation on satellites and their electronic components.

GSAT-19 also carries a miniaturised heat pipe, fibre optic gyro, Micro Electro-Mechanical Systems (MEMS) accelerometer, Ku-band TTC transponder, as well an indigenous Lithium-ion Battery.

GSLV Mk III-D1/GSAT-19 will be on June 05, 2017 at 17:28 Hrs (IST) from the Second Launch Pad at SDSC SHAR, Sriharikota.

The new rocket launcher GSKV-Mk III is capable of launching four-tonne satellites in the Geosynchronous Transfer Orbit (GTO), placing up to eight tonnes in a Low Earth Orbit (LEO), developed with an eye on manned module launch in the future with re-entry capability.

GSKV-Mk III was ISRO’s first fully functional rocket with a cryogenic engine using both liquid oxygen and liquid hydrogen as propellants. It was developed after 11 flights and 200 tests to fine-tune the components over a period of 25 years.

The 640-tonne rocket, with a lift off mass of 3,136 kg, was described by ISRO as equivalent to the weight of 200 fully-grown Indian elephants. It becomes the heaviest rocket made by ISRO so far but also the shortest rocket in terms of height measuring merely 43-metre height.

GSLV-Mk III will have two solid motor strap-ons (S200s), a liquid propellant core stage (L110) and a cryogenic stage (C-25), which have been tested thoroughly in static form at the Satish Dhawan Space Centre (SDSC), Sriharikota since 2010. The S200 strap-on is the third largest solid booster in the world.

Despite US sanctions, ISRO was able to develop its own indigenous cryogenic engine C-25, the large upper stage of the GSLV, which was tested successfully on February 18, 2017. The focus is on the GSLV-Mk III that may take over as the launcher for future manned missions being planned by ISRO.

The GSLV was primarily developed to launch INSAT class of satellites into Geosynchronous Transfer Orbits and it uses three stage launchers — one solid rocket motor stage, one Earth storable liquid stage and one cryogenic stage.

The recent flight of GSLV-D5 that placed GSAT-14 into its planned orbit has marked the first successful flight of the indigenously developed cryogenic stage.

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