Geosynchronous Satellite Launch Vehicle [GSLV]

About Launch Vehicle :

The Geosynchronous Satellite Launch Vehicle was primarily developed to launch INSAT/GSAT class of satellites into Geosynchronous Transfer Orbits. GSLV is being used for launching GSAT series of satellites. GSLV is a three stage launcher with a 139 tonnes solid booster and four 40 tonnes liquid strap-ons as first stage. Second stage is a 37.5 tonnes liquid stage. The third stage is 12.5 tonnes indigenous cryogenic upper stage(CUS). The most recent flight of GSLV, the GSLV-D6, placed GSAT-6 into its planned orbit and marked the second successful flight of the indigenous cryogenic stage. Earlier, GSLV had launched various communication satellites among which EDUSAT is notable, being India's first satellite built exclusively to serve the educational sector through satellite based distance education.

Vehicle Specifications :

Height : 49.13 m
Number Of Stages : 3
Lift Off Mass : 415 tonnes
First Flight : April 18, 2001

Overview Of GSLV :


Technical Specifications :

Payload to GTO : 2,500 Kg

GSLV's primary payloads are INSAT/GSAT class of communication satellites that operate from Geostationary orbits and hence are placed in Geosynchronous Transfer Orbits by GSLV.

Payload to LEO : 5,000 Kg

Further, GSLV's capability of placing up to 5 tonnes in Low Earth Orbits broadens the scope of payloads from heavy satellites to multiple smaller satellites.

Third Stage : CUS

Developed under the Cryogenic Upper Stage Project (CUSP), the CUS-12.5 is India's present cryogenic engine, developed by the Liquid Propulsion Systems Centre. CUS-12.5 has a staged combustion operating cycle.

Fuel: LOX + LH2
Max. Thrust : 75 kN
Burn-time : 720 Sec
Second Stage : GS2

One Vikas engine is used in the second stage of GSLV. The stage was derived from the PS2 of PSLV where the Vikas engine has proved its reliability.

Engine: Vikas
Fuel : UH25 + N2O4
Max. Thrust : 720 kN
Burn-time : 150 Sec
First Stage : GS1

The first stage of GSLV was also derived from the PSLV's PS1. The 139 tonne solid rocket motor is augmented by 4 liquid strap-ons.

Engine: S139
Fuel : HTPB based solid propellant
Max. Thrust : 4700 kN
Burn-time : 100 Sec
Strap-On Motors

The four liquid engine strap-ons used in GSLV are heavier derivatives of PSLV's PS2, and use one Vikas engine each.

Fuel: UDMH + N2O4
Max. Thrust : 680 kN
Burn-time: 148 Sec

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