Jul 15, 2011
PSLV-C17/GSAT-12
Polar Satellite Launch Vehicle (PSLV-C17), in its nineteenth flight, launches India's communication satellite GSAT-12 from the Second Launch Pad of Satish Dhawan Space Centre, SHAR, Sriharikota, India. PSLV-C17 measuring 44.5 m height, with a lift off weight of 320 tonnes has four stages of solid and liquid propulsion systems alternately. In its XL Version, PSLV-XL uses six extended solid strap-on motors wherein each strap-on carries 12 tonnes of solid propellant. This is a second time such a configuration is being flown, earlier one being the PSLV-C11/Chandrayaan-I mission.
Salient feature of PSLV-C17/GSAT-12 Mission:
- For the first time, use of indigenously designed and developed On-Board computer (OBC) with Vikram 1601 processor in both primary and redundant chains of the vehicle. The OBC performs the functions of Navigation, Guidance and Control processing for the vehicle.
- Use of extended solid strap-on configuration
- Satellite injection in elliptical transfer orbit sub-Geosynchronous Transfer Orbit (GTO)
- Five burn strategy (2 perigee burn and 3 apogee burn) for placing the GSAT-12 satellite from its sub-GTO to Geostationary Orbit
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PSLV- C17 Stages at a Glance
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STAGE-1
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STAGE-2
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STAGE-3
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STAGE-4
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Nomenclature
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Core Stage(PSI) + 6 Strap-on Motors
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PS2
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PS3
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PS4
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Propellant
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Solid
(HTPB Based) |
Liquid
(UH25+N2O4) |
Solid
(HTPB Based) |
Liquid
(MMH + MON-3) |
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Mass (Tonne)
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138.0 (Core) + 6 x 12.0 (Strap-on)
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41.0
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7.6
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2.5
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Max Thrust (kN)
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4703 (Core)
6 x 670(Strap-on) |
804
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244
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7.3 x 2
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Burn Time (sec)
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107 (Core)
55 (Strap-on) |
151
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116
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510
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Stage Dia (m)
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2.8 (Core)
1.0 (Strap-on) |
2.8
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2.0
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2.8
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Stage Length (m)
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20 (Core) |
12.8
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3.6
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2.6
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