After enduring nearly a year-long delay, India’s ambitious indigenous jet engine project the Dry Kaveri engine is finally on the threshold of a critical milestone. Developed by the Gas Turbine Research Establishment (GTRE) under the Defence Research and Development Organisation (DRDO), the engine is now set for full-cycle high-altitude testing in Russia by September this year.
This isn’t the Dry Kaveri’s first trip abroad. The engine has previously undergone evaluation aboard a modified Ilyushin IL-76 Flying Test Bed (FTB) in Russia. However, critical design adjustments and snags identified during past runs led GTRE to bring it back to India for rectification. With those refinements reportedly complete, the indigenous powerplant is once again heading to Russian skies for its most crucial validation phase yet.
The DRDO had initially planned to dispatch the engine for final high-altitude and FTB trials as early as November 2024. However, high demand at the Russian test facility caused repeated scheduling setbacks, pushing the testing window through December, January, and now finally to September 2025. Despite these delays, efforts are ongoing to secure an earlier test slot—though confirmation remains elusive.
#KaveriCalling 🇮🇳#DryKaveriEngine awaits full-cycle high-altitude tests in Russia | Set to power #RPSA once clearedhttps://t.co/M2kqFb1m0L
✔️ After nearly a year’s wait, the #DryKaveriEngine developed by GTRE for #RPSA is scheduled to reach Russia in September.
✔️ This is… pic.twitter.com/WHIUxIjZTs— Anantha Krishnan M🇮🇳 (@writetake) May 29, 2025
A senior defence official, speaking on condition of anonymity, said: “We’ve been in continuous talks to expedite the test schedule. The backlog at the facility has been a major hurdle, but all key parameters of the engine are now aligned for flight certification. We are prepared to ship as soon as we receive a green signal.”
The Dry Kaveri is a non-afterburning turbofan derivative of the original Kaveri engine and has been earmarked to power the upcoming Remotely Piloted Strike Aircraft (RPSA) a critical part of India’s future air combat ecosystem. The RPSA, a stealthy unmanned aerial combat vehicle (UCAV), is designed for deep-strike missions, and the Dry Kaveri’s successful induction will mark a generational leap for India’s military self-reliance under the “Atmanirbhar Bharat” initiative.
Parallel testing on Tejas planned, pending IAF nod
In tandem with the upcoming tests in Russia, GTRE and DRDO are also exploring plans to integrate the Dry Kaveri onto an LCA Tejas airframe most likely a Prototype Vehicle (PV) for in-country flight evaluations. However, this testbed project hinges on formal clearance from the Indian Air Force (IAF), which is expected to grant permission only after successful completion of the Russian trials.
A DRDO scientist involved in the programme noted: “We are confident that the engine will pass high-altitude tests, but IAF’s confidence is crucial before committing to flight trials on Tejas. Safety margins must be met, and the Russian FTB runs are key to proving viability.”
The Kaveri engine programme, which began in the 1980s, faced multiple setbacks over the decades, primarily due to technological bottlenecks and lack of access to cutting-edge materials. While the full-fledged afterburning version fell short of powering the LCA Tejas in the past, the Dry Kaveri’s recent resurrection and potential application in unmanned platforms marks a strategic pivot in DRDO’s propulsion roadmap.
The upcoming Russian test campaign will include high-altitude performance evaluations, thermal stress testing, and integration trials with the IL-76 FTB—a crucial step before flight-worthiness certification. If successful, the Dry Kaveri could soon become the first fully indigenous jet engine to power an operational Indian military aircraft—a landmark moment for the country’s aerospace sovereignty.
