BharatNotes What is a Reusable Launch Vehicle?
A Reusable Launch Vehicle (RLV) is a rocket or spaceplane engineered to be recovered after launch and flown again, instead of being expended on a single mission. By reusing expensive components such as engines, boosters or a winged orbiter, an RLV spreads hardware costs across many flights, which is the single biggest lever for reducing the price of placing payloads in orbit. Reusability can be partial (only the first stage returns, as with SpaceX's Falcon 9) or, as ISRO ultimately targets, full reusability through a Two-Stage-To-Orbit (TSTO) system.
India's RLV Technology Demonstration Programme
ISRO's RLV-TD is a winged, scaled prototype — popularly called "Pushpak", after the mythological flying chariot — used as a flying test-bed for technologies such as hypersonic flight, autonomous navigation and precise runway landing. The development has proceeded through a planned sequence of demonstration flights.
| Mission | Date | Key demonstration |
|---|---|---|
| RLV-TD HEX-01 (Hypersonic Flight Experiment) | 23 May 2016 | Launched from SDSC SHAR; validated re-entry aerodynamics at hypersonic speed |
| RLV LEX-01 (Landing Experiment) | 2 April 2023 | First autonomous runway landing, ATR Chitradurga, Karnataka |
| RLV LEX-02 | 22 March 2024 | Autonomous landing from off-nominal release; reused the LEX-01 vehicle |
| RLV LEX-03 | 23 June 2024 | Final LEX; harder manoeuvres under severe winds; reused LEX-02 body unmodified |
In the LEX series the Pushpak vehicle was carried aloft by an Indian Air Force Chinook helicopter and released from about 4.5 km altitude, after which it autonomously corrected its course and landed on the runway centre-line — slowing from over 320 km/h to roughly 100 km/h using a brake parachute and landing-gear brakes (RLV LEX-03, ISRO, June 2024).
Why reusability matters
The dominant cost in spaceflight is building a new rocket for every launch. Recovering and reusing the vehicle can cut launch costs sharply, improve launch cadence and reduce orbital debris from spent stages. For India, an indigenous RLV strengthens strategic autonomy in space access and supports commercial competitiveness through NewSpace India Limited (NSIL) and a growing private space sector.
Current status and the road ahead
With the LEX trio completed (the third experiment on 23 June 2024 being the last in the landing series), ISRO has validated autonomous approach and landing. The next planned step is an Orbital Return Flight Experiment (OREX), using a larger vehicle launched on an orbital-class rocket and fitted with a thermal protection system and retractable landing gear, working towards the eventual fully reusable TSTO launcher.
UPSC angle
For Prelims, remember the mission chronology and the name "Pushpak". For Mains GS3, frame RLV around cost reduction, indigenous technology, and India's strategic and commercial positioning in the global space economy. Cross-link to NSIL, the Indian Space Policy 2023, and private-sector space reforms for a complete answer.
