Reusable Launch Vehicle (RLV) Technology

Definition: An RLV is a launch system that recovers and re‑uses one or more of its stages, unlike expendable rockets that are discarded after launch.
Cost Reduction: Reusability can lower launch costs by 5–20 times.
Global Market Projection: The commercial space market is expected to exceed USD 1 trillion by 2030.
Tsiolkovsky Rocket Equation: Shows that ~90 % of a launch vehicle’s mass is propellant, leaving <4 % for payload.
Staging: Traditional Indian launchers (PSLV, GSLV‑Mk III) use fully expendable stages; RLVs aim to recover critical stages, especially the first stage.
RLV Mechanisms:
VTVL – Vertical Take‑off, Vertical Landing using retro‑propulsion.
Winged RLV – Horizontal landing similar to an aircraft.
Limitations: Thermal stress during re‑entry, high refurbishment costs, and stringent reliability requirements.

The space sector is shifting from government‑led exploration to private‑driven commercial activity.
Companies like SpaceX have demonstrated the economic viability of RLVs, prompting ISRO to accelerate its own programmes.
ISRO’s major RLV initiatives:
RLV‑TD (Pushpak) – Winged demonstrator for autonomous horizontal landing; successful LEX‑01/02/03 tests.
ADMIRE – Test‑bed for VTVL technology, focusing on retro‑propulsion similar to SpaceX’s Falcon 9.
NGLV (Project Soorya) – Next‑generation launch vehicle intended to replace the PSLV, featuring a reusable first stage with vertical landing capability.

Strategic Autonomy: Indigenous RLV capability reduces dependence on foreign launch services, enhancing national security.
Economic Benefits: Lower launch costs can boost the Indian satellite industry, attract foreign satellite customers, and generate revenue.
Policy Alignment: Supports the National Space Policy (2019) and the 'Make in India' initiative by fostering indigenous high‑technology development.
Employment & Skill Development: RLV programmes create high‑skill jobs in aerospace engineering, materials science, and software.

Article 48A of the Constitution (Directive Principles) directs the State to develop scientific temper and promote research, underpinning space technology development.
The Indian Space Research Organisation (ISRO) Act, 1962 establishes ISRO as a statutory body, empowering it to undertake R&D, launch services, and international cooperation.
National Space Policy, 2019 emphasizes reusable launch systems as a priority for sustainable space activities.