A 'Hat-trick' for Pushpak
The Indian Space Research Organisation (ISRO) recently achieved a major success with its Reusable Launch Vehicle (RLV) program. In a test series known as the Landing Experiment (LEX), ISRO completed its third and final autonomous landing test at the Aeronautical
Test Range in Chitradurga, Karnataka. The winged vehicle, nicknamed 'Pushpak', was carried to an altitude of 4.5 kilometres by an Indian Air Force Chinook helicopter and released. From there, it had to find its own way to the runway and land perfectly, all by itself.
What Makes This Test So Special?
While this was the third successful landing, it was by far the most challenging. ISRO intentionally released Pushpak under difficult conditions, including severe crosswinds and from a position significantly off-course from the runway. The vehicle had to autonomously perform complex manoeuvres, correct its flight path, approach the runway at high speed—over 320 kmph—and execute a precise horizontal landing. The success demonstrated the sophistication of its indigenous guidance, navigation, and control systems. Critically, the mission reused the same winged body from the second test, proving the hardware's robustness and ISRO's ability to design systems for multiple missions.
The Billion-Dollar Question: Why Reusability Matters
For decades, space launches have followed a costly model: build a massive, expensive rocket, use it once, and let its components burn up in the atmosphere or fall into the sea. This is like building a brand-new aeroplane for every single flight. Reusable Launch Vehicles change this fundamentally. The most expensive parts of a rocket are its engines and complex structures. By designing them to return to Earth and land safely, they can be refurbished and flown again. This is the key to drastically reducing the cost of accessing space. ISRO's stated goal is to slash the cost of launching a payload into orbit, potentially by a factor of ten, from around $20,000 per kilogram to a fraction of that.
How Pushpak Paves the Way for Cheaper Launches
Pushpak is a technology demonstrator, a stepping stone towards a fully operational Two-Stage-to-Orbit (TSTO) launch vehicle. The idea is that a large, reusable winged vehicle like Pushpak will form the first stage, carrying an expendable upper stage with the satellite to a high altitude before separating. The upper stage would then deliver the satellite into orbit, while the reusable first stage flies back and lands on a runway, ready for its next mission. By making the most expensive part of the rocket reusable, ISRO can offer highly competitive launch services through its commercial arm, NewSpace India Limited. This will attract more international customers and open up space for smaller companies, researchers, and startups who were previously priced out.
India's Unique Approach and the Road Ahead
While companies like SpaceX have pioneered vertical landings for their rocket boosters, ISRO is mastering the complex technology of a horizontal, runway landing, much like an aircraft or the US Space Shuttle. This requires a different set of technologies, including winged-body aerodynamics, advanced thermal protection for re-entry, and precise autonomous control. Having successfully completed the landing experiment series, ISRO's next major step is the Orbital Re-entry Experiment (ORE). This will involve launching a vehicle into orbit and having it re-enter the atmosphere and land, a far more complex challenge that will truly test the limits of the technology developed so far.
