Meet Pushpak, India's Space Shuttle
The Indian Space Research Organisation (ISRO) is developing a Reusable Launch Vehicle (RLV), a winged aerospace craft officially known as the RLV-TD (Technology Demonstrator). Affectionately named 'Pushpak' after the mythical flying palace from the Ramayana,
this uncrewed vehicle looks like a small space shuttle. It has a fuselage, double delta wings, and twin rudders. The goal is to create a vehicle that can launch satellites into orbit and then fly back to Earth, landing on a runway just like an airplane. This ambitious project is India's answer to the high costs associated with space missions, aiming to make the nation a more competitive player in the global satellite launch market.
The Crucial Landing Tests
A reusable rocket is only useful if it can land safely. To perfect this critical phase, ISRO has been conducting a series of Landing Experiments (LEX) at the Aeronautical Test Range in Chitradurga, Karnataka. In these recent tests, an Indian Air Force Chinook helicopter lifts the Pushpak prototype to an altitude of 4.5 kilometres. The vehicle is then released to perform a fully autonomous landing. During its descent, Pushpak has to navigate itself, correct its course, approach the runway at high speed (over 320 km/h), and execute a precise touchdown. After landing, it uses a drogue parachute and its landing gear brakes to slow down and stop safely. Successfully completing these complex manoeuvres under challenging conditions demonstrates that the core technology for a reusable vehicle is well within ISRO's grasp.
Why Reusability is a Game Changer
Traditionally, rockets are single-use vehicles. The expensive, high-tech components are discarded as space junk after every mission. This makes satellite launches incredibly costly. ISRO's primary goal with the RLV program is to drastically cut these expenses. By reusing the most expensive parts of the rocket, ISRO aims to reduce the cost of putting a payload into orbit by up to 80%, from an estimated $20,000 per kilogram to around $4,000. This would make India's launch services, which are already known for being frugal, even more attractive to international customers. Lower launch costs will not only boost the commercial viability of ISRO's commercial arm, NSIL, but also open up space for more scientific research, telecommunications, and Earth observation missions that were previously too expensive to consider.
The Road Ahead: From Landing to Orbit
The successful landing tests are a vital part of a much larger plan. The RLV-TD is a scaled-down prototype designed to test key technologies in phases. The first phase, the Hypersonic Flight Experiment (HEX), was completed in 2016 and validated the vehicle's design and ability to withstand re-entry from the edge of space. With the landing experiments (LEX) now concluded, the next major step is the Orbital Re-entry Experiment (OREX). For OREX, a larger version of Pushpak will be launched into orbit on a modified rocket, spend time in space, and then perform a full re-entry and autonomous runway landing. This will be the ultimate test of the vehicle's capabilities and will pave the way for a fully operational Two-Stage-to-Orbit (TSTO) launch vehicle, where the reusable first stage flies back to base after separating.
