SYLLABUS

GS-3: Science and Technology- Developments and their Applications and Effects in Everyday Life; Indigenization of Technology and Developing New Technology.  

Context: China successfully recovered and landed the first stage of its Long March-10B rocket, marking its first successful demonstration of an orbital-class reusable launch vehicle and a major milestone in its space programme.

More on the News

• The Long March-10B successfully completed a controlled descent and vertical landing on a sea-based recovery platform, becoming China's first recovered orbital-class reusable rocket booster. 

• Unlike conventional landing-leg recovery systems, the booster was captured using a net-based recovery system mounted on an offshore platform, a method claimed to be a world-first in reusable rocket recovery. 

• The rocket can carry about 16 tonnes to Low Earth Orbit (LEO) in reusable mode and is expected to support China's Qianfan satellite constellation, commercial launch market, and future lunar exploration missions.

Reusable Rocket Technology: Concepts and Types

• What are Reusable Rockets?

• Reusable rockets are launch vehicles whose stages or major components can be recovered after launch, refurbished, and flown again for future missions. 
• Unlike conventional expendable rockets, they are designed to survive re-entry and landing, reducing the need to manufacture a new rocket for every launch. 

• Why Does Reusability Matter?

• The first-stage booster accounts for a major share of launch costs because it contains expensive engines, avionics, fuel systems, and structural components. 
• Recovering and reusing these components can significantly reduce the cost of access to space and improve launch frequency. 
• The concept is often compared to commercial aviation, where aircraft are reused repeatedly rather than discarded after a single flight. 

• Types of Recovery Systems

• Vertical Take-off, Vertical Landing (VTVL)

                    The rocket launches vertically and returns to land vertically using controlled engine burns and precision guidance systems. 

                    Requires advanced navigation, thrust-vector control, and autonomous landing technologies. 

                    Examples: SpaceX Falcon 9, SpaceX Starship Booster, Blue Origin New Shepard, China's Long March-10B

• Horizontal Landing Systems

                  The vehicle returns through the atmosphere and lands on a runway like an aircraft. 

                  Requires aerodynamic control surfaces and robust thermal protection systems. 

                  Examples: ISRO's Pushpak Reusable Launch Vehicle (RLV), NASA Space Shuttle 

• How Reusable Rockets Work

• After launch, the reusable stage separates from the upper stage carrying the payload. 
• Guidance, navigation, and control systems steer the booster through a controlled descent trajectory. 
• Engine burns reduce velocity before landing on a designated platform or runway. 
• The recovered vehicle is inspected, refurbished, and prepared for future launches.

Significance of Reusable Rocket Technology

• Lowering the Cost of Space Access: Reusing expensive booster stages significantly reduces launch costs, making space missions more affordable. 

• Increasing Launch Frequency: Faster turnaround and reuse enable more frequent launches than conventional expendable rockets. 

• Supporting Mega Satellite Constellations: Reusable launch systems facilitate the cost-effective deployment of large satellite networks for communication and internet services. 

• Enabling Future Deep-Space Missions: Reduced launch costs improve the feasibility of sustained lunar, planetary, and human spaceflight missions. 

• Expanding the Commercial Space Economy: Affordable and frequent launches encourage private-sector participation and enhance competitiveness in the global space market.

India's Reusable Launch Vehicle Efforts

• ISRO's RLV Programme

• ISRO is developing a reusable launch system through the Reusable Launch Vehicle-Technology Demonstrator (RLV-TD) programme. 
• The programme seeks to reduce launch costs and enhance India's competitiveness in the global launch market. 

• Key Milestones

• HEX (Hypersonic Flight Experiment), 2016: Demonstrated atmospheric re-entry technologies. 
• LEX (Landing Experiment), 2023 & 2024: Successfully validated autonomous runway landing capabilities. 
• Pushpak RLV: Demonstrated autonomous landing and recovery technologies required for future reusable launch systems. 

• Significance for India

• Can substantially reduce launch costs for Indian missions. 
• Strengthens India's position in the global commercial launch market. 
• Supports the long-term objectives of India's expanding space economy and future human spaceflight ambitions.

Challenges in Mastering the Reusable Technology

• Precision Recovery: Achieving reliable landings under varying atmospheric and operational conditions remains technologically demanding. 

• Thermal Protection: Re-entry generates extreme temperatures, requiring advanced heat-shield materials and durable structures. 

• Refurbishment Requirements: Frequent inspection, repair, and maintenance can reduce the economic benefits of reusability. 

• Economic Viability: Reusable systems become cost-effective only when refurbishment costs and turnaround times remain significantly lower than the cost of building a new rocket. 

• Safety and Reliability: Launch vehicles must maintain high performance and reliability across multiple flight cycles.  

Future Outlook

• Reusable rockets are expected to become the backbone of commercial launch services and satellite-constellation deployment. 

• Advances in propulsion, automation, and materials science will further improve the efficiency of reusable launch systems. 

• As more countries and private companies master reusability, competition is likely to reduce launch costs and expand global access to space. 

• Reusable launch vehicles will play a crucial role in future lunar missions, deep-space exploration, and the long-term commercialisation of outer space.