Apr 18, 2001
GSLV-D1 / GSAT-1
The Geo-synchronous Satellite Launch Vehicle (GSLV) is designed to place satellites in Geo-Synchronous Transfer Orbit (GTO). It adopts the flight-proven solid and liquid stages of ISRO’s Polar Satellite Launch Vehicle (PSLV) and a cryogenic upper stage. The first development flight, GSLV-D1, carried experimental communication satellite, GSAT-1.
GSLV is a three stage vehicle, 49m tall. The first stage, GS1, comprises a solid propellant motor (S125) and four liquid propellant strap-on stages(L40). The second stage (GS2) is powered by a single liquid propellant engine (L37.5). The third stage (GS3) is a cryogenic stage (C12) with re-startable engines.
| Parameter | GS1 Stage (First Stage) | GS2 stage (Second stage) |
GS3 stage (Third stage) |
|
|---|---|---|---|---|
| S125 booster | L40 strapon | |||
| Length (m) | 20.3 | 19.7 | 11.6 | 8.7 |
| Dia (m) | 2.8 | 2.1 | 2.8 | 2.8 |
| Total mass (t) | 156 | 46 | 42.8 | 15 |
| Propellant mass (t) | 129 | 40 | 38 | 12.5 |
| Case/Tank material | M250 steel | Aluminium Alloy | Aluminium Alloy | Aluminium Alloy |
| Propellant | HTPB | UDMH & N2O4 | UDMH & N2O4 | LH2 & LOX |
| Burn time (s) | 100 | 160 | 150 | 720 |
| Max. Vac. Thrust (kN) | 4700 | 680 | 720 | 73.5 |
| Specific impulse (Ns/kg) | 2610 | 2750 | 2890 | 4510 |
| Control system | Multi-port SITVC | EGC single plane gimballing | EGC two plane gimballing for pitch & yaw control. Hot gas RCS for roll control. | 2 steering engines for thrust phase control & cold gas RCS for coast phase control. |