BharatNotes What is GSLV Mk-III (LVM3)?
GSLV Mk-III — officially designated LVM3 (Launch Vehicle Mark-3) — is the Indian Space Research Organisation's (ISRO) most powerful operational rocket. Despite carrying "GSLV" in its name, it is a fundamentally new vehicle rather than an upgrade of the earlier GSLV Mk-II. It was built to launch India's heavier 4-tonne-class GSAT communication satellites, ending India's dependence on foreign launch providers for such payloads.
LVM3 has a lift-off mass of about 640 tonnes and stands roughly 43.5 m tall (ISRO, GSLVmk3 specifications). It can carry approximately 4,000–4,200 kg to Geosynchronous Transfer Orbit (GTO) and around 8 tonnes to Low Earth Orbit (LEO).
Three-stage configuration
LVM3 is a three-stage vehicle built around indigenous propulsion:
| Stage | Designation | Propellant | Key detail |
|---|---|---|---|
| Strap-on boosters | S200 (two) | Solid (~204 t each) | Among the largest solid boosters in the world |
| Core stage | L110 | Liquid (~115 t) | Twin Vikas engines; ignites ~114 s after lift-off |
| Upper stage | C25 | Cryogenic LOX/LH2 (~28 t) | Powered by the indigenous CE-20 engine |
The CE-20 is the first Indian cryogenic engine to use a gas-generator cycle, with a nominal thrust of about 200 kN (developed by ISRO's Liquid Propulsion Systems Centre).
Major missions
- First experimental flight: 18 December 2014 (sub-orbital, with crew-module re-entry test CARE)
- First orbital flight: 5 June 2017, carrying GSAT-19
- Chandrayaan-2: 22 July 2019
- Chandrayaan-3: July 2023 (successful soft landing near the lunar south pole)
- OneWeb commercial missions: 22 October 2022 and 26 March 2023, placing 72 broadband satellites into LEO
Human-rated HLVM3 and Gaganyaan
For India's Gaganyaan human spaceflight programme, ISRO is developing a human-rated variant, HLVM3, with enhanced reliability — added redundancy, a quad-redundant Navigation & Guidance Computer, dual-chain telemetry, and a Crew Escape System. ISRO began stacking HLVM3 at SDSC-SHAR for the first un-crewed Gaganyaan test flight (carrying the humanoid robot Vyommitra), with the flight expected in the second half of 2026 (as per ISRO mission updates, 2025-2026).
UPSC angle
LVM3 is a recurring science-and-technology theme. For Prelims, focus on the three-stage layout, the indigenous CE-20 cryogenic engine, payload capacities, and mission associations (Chandrayaan, OneWeb, Gaganyaan). For Mains GS3, it illustrates indigenisation of strategic technology and India's growing role in the global commercial launch market through NSIL. It is a foundational concept that underpins broader questions on India's space economy, self-reliance in cryogenic technology, and the Indian Human Spaceflight Programme.
Don't confuse: GSLV Mk-II (smaller, ~2.5 t to GTO, uses the CE-7.5 cryogenic engine) with LVM3 / GSLV Mk-III (~4 t to GTO, uses CE-20).
