Kaveri 2.0: India’s New 90–100 kN Fighter Engine Could Power Tejas Mk1A

The Kaveri engine has been one of the most anticipated indigenous projects for the Indian Air Force. India has been working on the engine for nearly four decades, but the programme has faced numerous technical challenges and delays, with the engine ultimately being delinked from the Tejas fighter programme in 2008.

Now, however, the Kaveri story appears to be entering a new phase.

According to the latest developments emerging this month, the DRDO’s Gas Turbine Research Establishment, or GTRE, is looking at a major redesign of the Kaveri engine under what is being referred to as the Kaveri 2.0 concept.

The focus is reportedly on developing a new 90-kilonewton-class engine core, with the longer-term possibility of using the engine to replace the GE F404 engines powering the Tejas Mk1A during future mid-life upgrades.

If successful, such a development could significantly reduce India’s dependence on foreign fighter engines, particularly at a time when delays in the global supply chain have already affected aircraft production.

90 kN-class thrust target

The proposed Kaveri 2.0 is being discussed around a target of approximately 55–60 kN of dry thrust and 90–100 kN of afterburning thrust.

That would put the engine much closer to the performance range required for the Tejas Mk1A.

But this is not simply a matter of increasing the thrust of the existing Kaveri.

The reported approach involves a fundamental redesign of the engine architecture, rather than another incremental upgrade of the earlier Kaveri design.

One of the major areas of focus is the engine core, including a redesigned high-pressure compressor, improved compressor aerodynamics and advanced materials.

The programme is also looking at single-piece blisk technology, where the compressor blades and disk are manufactured as an integrated component. This can help reduce weight and improve efficiency by eliminating conventional blade-to-disk connections.

Advanced titanium alloys are also being considered to further reduce weight while maintaining structural strength.

Another important development is India’s progress in single-crystal turbine blades. These blades can operate at much higher temperatures and are critical for improving the thermal efficiency and overall performance of a modern fighter engine.

India has been working with private industry to build capability in this area, and these developments could become an important part of the next generation of the Kaveri.

A lighter Kaveri engine

Weight has always been another major challenge for the Kaveri.

Earlier versions of the engine were significantly heavier than the GE F404, which created problems when it came to integrating the engine with the Tejas.

The newer approach is therefore not only about generating more thrust but also about making the engine substantially lighter.

The reported target is to bring the engine weight down from roughly 1,200 kg-plus territory toward around 1,100 kg, with future development potentially targeting the 1,000 kg class.

Achieving that would require extensive use of modular design, additive manufacturing, advanced composites and new material technologies.

Other areas reportedly being examined include improved compressor aerodynamics, advanced blisk technology, a more efficient turbine arrangement, modern Full Authority Digital Engine Control (FADEC) and greater use of advanced polymer-based composite materials.

Kaveri 2.0 is not the AMCA engine

There is also an important distinction here.

The Kaveri 2.0 concept being discussed for the Tejas is essentially a medium-thrust fighter engine, with development potentially targeting around the 2030 timeframe.

India is simultaneously pursuing a much more powerful engine for the future AMCA, with a target in the 120–140 kN thrust class.

That programme involves collaboration with France’s Safran and is intended for India’s next-generation stealth fighter.

There is also a separate Kaveri-derived development associated with the Ghatak stealth UCAV, where the engine is being adapted for an unmanned combat aircraft.

Earlier milestones, including afterburner-related testing, have indicated that the Kaveri technology base is still being actively pursued.

From a failed Tejas engine to a possible second chance

The Kaveri programme has had a long and difficult journey.

It was originally conceived decades ago as India’s indigenous fighter engine, but technical limitations prevented it from meeting the requirements of the Tejas. The programme was eventually separated from the fighter in 2008, and the Tejas moved ahead with the GE F404.

For years, the Kaveri programme appeared to be stuck between development challenges and the question of whether India should continue investing in it.

But the situation is changing.

India now has significantly greater experience in advanced manufacturing, single-crystal turbine technology, additive manufacturing, composites and digital engine control systems.

That does not mean Kaveri 2.0 is ready to power the Tejas tomorrow. Far from it.

The proposed 90–100 kN-class Kaveri 2.0 is still a development effort, and official confirmation from GTRE and DRDO will be important before drawing firm conclusions about its specifications, timeline and integration with the Tejas Mk1A.

Still, the direction is significant.

After decades of development, India is once again looking at the possibility of putting an indigenous engine into one of its frontline fighter aircraft.

If Kaveri 2.0 can overcome the technical challenges that affected its predecessor, it could become much more than another engine programme. It could mark an important step toward reducing India’s dependence on foreign fighter engines and building a genuinely indigenous aerospace propulsion ecosystem.

For now, we will have to wait for official confirmation from DRDO and GTRE. But if these developments materialise, the next chapter of the Kaveri engine story could be very different from the first.