Reusable Rockets and the Future

Source: TH

Subject: Science and Technology

Context: The space industry is at a crossroads as SpaceX’s Starship prepares for full-scale commercial operations and ISRO moves toward its critical Orbital Return Flight Experiment (OREX).

• These developments aim to solidify reusability as the global standard for lowering the cost of access to space by up to 80%.

About Reusable Rockets and the Future:

What are Reusable Rockets:

• A reusable rocket is a launch vehicle designed to return to Earth intact, allowing its most expensive components—like engines and avionics—to be refurbished and flown again.

• This shifts spaceflight from a disposable model (where a new rocket is built for every mission) to a transportation model (similar to commercial aviation), where the hardware is used dozens of times, amortizing the manufacturing cost across multiple flights.

Key Trends in Rocket Reusability:

• Starship Dominance: The push toward Full Reusability (recovering both the booster and the upper stage) is nearing reality, promising to carry up to 100 tons to orbit.

• Rapid Turnaround: Leading companies are targeting a 24-hour turnaround time, treating rockets like aircraft to meet the demand of massive satellite constellations like Starlink.

• Vertical Integration: Companies are moving toward in-house 3D printing and modular designs to make the maintenance of reusable parts faster and cheaper.

• Global Competition: Beyond SpaceX, players like Blue Origin (New Glenn) and China’s LandSpace (Zhuque-3) are entering the market with vertical landing boosters in 2026.

Why Rockets Have Different Stages:

• Shedding Dead Weight: As fuel is consumed, the heavy empty tanks become dead weight.

• Efficiency: By discarding spent stages, the rocket becomes lighter, allowing the remaining fuel to push the smaller remaining mass much faster.

• The Reusability Shift: In traditional rockets, these stages are thrown into the ocean; in reusable systems, they are guided back to land.

Comparison of Global Leaders vs. India (2026):

Feature | Global Status (SpaceX / Blue Origin) | India Status (ISRO)

Recovery Method | Vertical Takeoff & Vertical Landing (VTVL): Uses retro-propulsion (firing engines downward) to land on a pad or drone ship. | Winged Body (Spaceplane) & Retro-propulsion: Uses a glider design (Pushpak) for horizontal runway landings; retro-propulsion is planned for the NGLV.

Reuse Record | Mature & Operational: Boosters (Falcon 9) are routinely reused 30+ times. Starship is moving toward 100% reusability. | Experimental & Testing: Successful LEX (Landing Experiment) series completed in 2024-25. No orbital stage has been reused yet.

Main Vehicle | Falcon 9 & Starship: Reliable workhorse fleet. Starship is the world’s first fully reusable heavy-lift vehicle. | Pushpak (RLV-TD) & NGLV: Pushpak is a technology demonstrator; the Next Generation Launch Vehicle (NGLV) is the future reusable workhorse.

Cost per kg to LEO | Highly Competitive: Approximately $1,500 – $2,700 due to high launch cadence and mass recovery. | Targeting Efficiency: Currently higher; however, ISRO aims for a 10x reduction in costs once the RLV/NGLV is operational.

Primary Goal | Commercial Dominance & Deep Space: Focus on Mars colonization, Starlink, and private space tourism. | Strategic Autonomy: Focus on Aatmanirbhar space access, the Bharatiya Antariksh Station, and cost-effective commercial launches.

Challenges to India in Reusable Rockets:

• Thermal Protection Systems (TPS): Withstanding the 2000°C heat of re-entry is a major hurdle for India’s winged RLV.

E.g. ISRO is currently testing advanced Ceramic Matrix Composites to ensure the Pushpak vehicle doesn’t disintegrate during its 2026 orbital return test.

• Precision Autonomous Landing: Guiding a vehicle from space to a specific runway or barge requires sub-meter accuracy.

E.g. The RLV-LEX-03 test in June 2024 validated landing in high-wind conditions, but doing so from an orbital velocity remains the next big challenge.

• Propulsion Limitations: Current Indian engines (like those in PSLV/LVM3) are not designed for the multiple re-starts needed for landing.

E.g. ISRO’s development of the LOX/Methane engine is a response to the need for a cleaner, more easily refillable propellant for reusability.

• Refurbishment Economics: The cost of cleaning and testing a used rocket must be significantly lower than building a new one.

E.g. Following the PSLV C-62 failure in early 2026, concerns about trust deficits in reused hardware have increased insurance premiums for the Indian space sector.

• Infrastructure Gaps: India lacks dedicated recovery barges and high-speed telemetry networks for ocean landings.

E.g. ISRO is currently planning a 4 km long airstrip at Sriharikota specifically for future RLV landings.

Way ahead:

• Fast-track the NGLV (Soorya) roadmap: NGLV Soorya is India’s future heavy-lift vehicle with 30-tonne LEO capacity and a reusable first stage. Completing the three developmental flights (D1–D3) within the 8-year timeline is essential for the Bharatiya Antariksh Station and crewed lunar missions.

• Shift to a PPP-led manufacturing model: ISRO must act as a technology enabler while industry handles large-scale manufacturing through PPPs.

• Support reusable launch start-ups: Start-ups like Agnikul and Skyroot provide fast, low-cost experimentation in reusable systems. Their SSLVs function as agile testbeds whose validated technologies can be scaled into national heavy-lift programmes.

• Leverage the IN-SPACe Venture Capital fund: The ₹1,000-crore VC fund supplies long-term risk capital for deep-tech launch systems. By backing ~40 firms, it curbs brain drain, promotes competition, and drives down orbital launch costs through market pressure.

• Master advanced recovery technologies: India must develop both vertical booster landings for heavy rockets and horizontal runway landings for winged RLVs like Pushpak.

Conclusion:

India must fast-track the NGV (Next Generation Vehicle), designed from the ground up for reusability, while fostering private space start-ups (like Agnikul and Skyroot) to build smaller, reusable launch solutions. Shifting focus from “Government-only” to a “PPP model” will provide the capital needed for the high-risk R&D of full reusability.

Q. What is reusable launch vehicle (RLV)? RLV offers cost-effective access to space, reduced launch costs, and increased flexibility in deploying satellites and conducting space missions. Discuss. (250 words)