Meet Pushpak, India's Spaceplane
ISRO has been successfully testing its Reusable Launch Vehicle (RLV) technology demonstrator, a winged vehicle nicknamed 'Pushpak'. Unlike traditional rockets that are discarded after one use, Pushpak is designed to fly into space, deploy a payload, and
then land back on Earth like an aircraft. This series of experiments, known as the Landing Experiment or LEX, has been crucial. In recent tests, Pushpak was carried to an altitude of 4.5 km by an Air Force Chinook helicopter and released to perform a fully autonomous, high-speed landing on a runway. The final test in June 2024 successfully demonstrated its ability to land precisely even under challenging wind conditions, a critical step toward proving its reliability.
Why Reusability Is a Game-Changer
For decades, spaceflight has been incredibly expensive largely because rockets are expendable. The most sophisticated and costly components, including the engines and vehicle structure, are used just once before burning up in the atmosphere or falling into the ocean. It’s estimated that the rocket hardware itself can account for up to 80% of a mission's total cost. Reusable vehicles like Pushpak change this economic model entirely. By recovering and reusing the most valuable parts of the launch system, the cost per mission plummets. ISRO's ambitious goal is to reduce the cost of delivering payloads to Low Earth Orbit by as much as 80-90%, potentially from around $20,000 per kilogram to just $2,000.
How It Gives India a Commercial Edge
Mastering reusability will position ISRO and its commercial arm, NewSpace India Ltd. (NSIL), as a major competitor in the multi-billion dollar global satellite launch market. Lower launch costs make space more accessible to a wider range of customers, including smaller companies, research universities, and nations that previously found space access to be financially out of reach. This technology opens the door for deploying large satellite constellations and other ambitious projects that were once commercially unviable. While companies like SpaceX have pioneered reusable rocket boosters that land vertically, ISRO's winged spaceplane represents a different technological approach to achieving the same goal of affordable, routine access to space.
The Road Ahead for Pushpak
The successful completion of the three landing experiments (LEX-01, LEX-02, and LEX-03) is a significant milestone, but the journey isn't over. These tests focused on the vehicle's autonomous landing capability, simulating the final phase of a return from space. The next major step for ISRO is the Orbital Re-entry Experiment (ORE). In this future mission, a vehicle like Pushpak will be launched into orbit on a rocket, spend time in space, and then perform a full re-entry through Earth's atmosphere before making an autonomous landing. This will test the vehicle's thermal protection systems and its ability to handle the extreme conditions of returning from orbit, paving the way for a fully operational two-stage reusable launch system.
