Kaveri to AMCA: How Indigenous Engines Are Powering India’s Stealth Drone Family

India is strategically advancing its unmanned combat capabilities by developing an entire family of stealth drones, moving beyond the initial 13-ton Ghatak UCAV to conceptualize a larger 24-ton “Loyal Wingman” platform, all powered by breakthroughs in indigenous propulsion—namely the resurrected Kaveri Derivative Engine (KDE) and the more powerful 73 kN dry thrust engine from the AMCA Mk2 program. With the KDE set for certification by late 2026 and the Defence Procurement Board already recommending the acquisition of 60 Ghatak units, India is following a phased, technology-driven roadmap that leverages the proven SWiFT flying wing demonstrator and integrates artificial intelligence for autonomous operations, aiming to field these systems as force-multipliers that can penetrate enemy air defenses alongside manned fifth-generation fighters like the AMCA.

Kaveri to AMCA: How Indigenous Engines Are Powering India’s Stealth Drone Family

India is charting an ambitious course in military aviation, moving beyond the development of a single unmanned aircraft to conceptualize an entire family of stealth drones. This strategic shift, powered by breakthroughs in indigenous propulsion and fifth-generation fighter technology, aims to provide the Indian Air Force (IAF) with a decisive edge in future conflicts. At the heart of this transformation are two critical programs: the Kaveri engine and the Advanced Medium Combat Aircraft (AMCA) project, whose technological dividends are now seeding a new generation of unmanned combat aerial vehicles (UCAVs) . 

Beyond Ghatak: How India’s Kaveri and AMCA Engines Are Powering a Stealth Drone Revolution 

The buzz around India’s defence corridors is no longer just about the Tejas or the much-anticipated AMCA stealth fighter. A quieter, yet more profound, revolution is underway in the unmanned domain. For decades, the Indian defence establishment was perceived as being reactive, often playing catch-up to regional rivals. However, with the recent revelations surrounding the Ghatak UCAV and its successors, a picture of a deliberate, phased, and technologically confident roadmap is emerging. 

The news isn’t just that India is building a stealth drone; it’s that India is planning an entire lineage of them. From a 13-ton combat drone to a massive 24-ton “loyal wingman,” these platforms are set to leverage the hard-earned lessons from the Kaveri engine project—a 30-year odyssey that is finally bearing fruit—and the cutting-edge tech from the AMCA program . This is the story of how a nation is transforming its biggest aerospace failures into a blueprint for future air power. 

The Heart of the Matter: The Kaveri Phoenix 

To understand India’s stealth drone program, one must first understand the engine that will power it. The Kaveri Derivative Engine (KDE) is nothing short of a phoenix rising from the ashes. Originally conceived in the late 1980s to power the Light Combat Aircraft (LCA) Tejas, the Kaveri engine project was a saga of high hopes and technical hurdles. For years, it struggled to meet the thrust requirements for a manned fighter jet, specifically the 83-85 kN needed for the Tejas . Critics wrote it off as a symbol of over-ambition and technological gaps. 

But the Defence Research and Development Organisation (DRDO) and its Gas Turbine Research Establishment (GTRE) refused to let the dream die. They pivoted. Instead of abandoning the project, they repurposed it. The result is the KDE, a “dry” (non-afterburning) variant of the engine, optimized not for the screaming dogfights of a Tejas, but for the long-endurance, stealthy penetration missions of a UCAV like the Ghatak . 

This strategic pivot is genius in its simplicity. By removing the afterburner, the engine runs cooler, drastically reducing its infrared signature—a critical requirement for a stealth platform trying to evade heat-seeking missiles. It also becomes more fuel-efficient, extending range and loiter time. Currently delivering around 49 kN of dry thrust, the KDE is undergoing final certification, with Godrej Aerospace delivering serial production standard units (D1, D2, D3) for rigorous testing in extreme conditions . 

The timeline is critical. By the end of 2026, the KDE is expected to receive formal clearance . This isn’t just a lab success; this is a manufacturing reality. Once certified, the path is clear to present the proposal for a full-scale Ghatak prototype to the Cabinet Committee on Security (CCS). The engine that was once a symbol of India’s failure has become the cornerstone of its unmanned future. 

Ghatak: The 13-Ton Vanguard 

The Ghatak, a 13-ton UCAV comparable in size to the Tejas Mk1A fighter, is the immediate beneficiary of this engine breakthrough . But Ghatak is more than just an engine testbed. It is a comprehensive weapons system designed for the most dangerous missions. Imagine a pilotless aircraft penetrating 500 kilometers into enemy territory, evading advanced radar systems like the Chinese-origin HQ-9/P, and dropping precision-guided munitions on heavily defended command centers or air defense batteries . 

This is the Ghatak’s raison d’être. It is designed for “Suppression of Enemy Air Defences” (SEAD), a mission so risky that sending a manned aircraft is often a gamble. 

Crucially, the Ghatak’s design has already been de-risked by the SWiFT (Stealth Wing Flying Testbed) program. In July 2022 and subsequent trials, this smaller technology demonstrator proved that India could master the complex aerodynamics of a tailless, flying-wing configuration—the same shape used by the American B-2 bomber . The SWiFT, made of indigenous carbon composites, validated autonomous take-off and landing, proving that the fundamental design philosophy is sound . 

Recent reports suggest that this program has gained significant momentum. In early March 2026, the Defence Procurement Board (DPB) recommended the acquisition of 60 Ghatak UCAVs . This isn’t just an experimental order; it’s a statement of intent. The IAF is not merely watching from the sidelines; it is integrating this capability into its “Vision 2047” roadmap, planning for a future where unmanned systems operate ahead of manned fighters to absorb the first wave of enemy fire . 

The Heavy Lifter: AMCA-Class Loyal Wingman 

While Ghatak is the immediate focus, the Aeronautical Development Establishment (ADE) is already looking at the horizon. Conceptual work has begun on a much larger, 22–24 ton stealth UCAV . This is where the cross-pollination with the AMCA program becomes most evident. 

This future drone is intended to be a true “Loyal Wingman.” It will fly alongside manned fifth-generation AMCA fighters, acting as a missile mule and sensor extender. Picture this: an AMCA pilot, instead of flying into the teeth of an enemy integrated air defense system, stays at a safe distance while his loyal wingman drones dash ahead. Their advanced sensors paint a detailed picture of the battlespace, and their internal bays unleash a barrage of missiles, all while the pilot remains safely out of harm’s way. 

To perform this role, the heavy UCAV will need serious power. It will likely be powered by the engine currently being developed for the AMCA Mk2, which is expected to provide a staggering 73 kN of dry thrust—significantly more than the Ghatak’s KDE . This power allows for heavier payloads (nearly one tonne more internal ordnance than the Ghatak), higher speeds, and the ability to operate at altitudes that keep pace with manned fighters. 

This represents a fundamental shift in combat philosophy. The IAF is moving from a platform-centric force to a system-of-systems approach. The AMCA won’t fight alone; it will be the quarterback of a team of unmanned aircraft, directing them to where they are needed most. This concept, once the stuff of science fiction, is now a concrete development goal for India, projected to gain momentum around 2029-2030 . 

The AI Factor: From Remote Control to Electronic Pilots 

One of the most significant, yet often understated, aspects of this drone family is the level of autonomy being baked into their design. Early drones were little more than remotely piloted aircraft, constantly tethered to a ground station by a data link. An adversary could jam that link and render the drone useless. 

India’s next-generation stealth drones are designed to overcome this. They are shifting from remote management to AI-driven operations, featuring what developers call an “electronic pilot” . This AI will be capable of independent decision-making. It will manage the flight, navigate using pre-surveyed coordinates (as demonstrated by the SWiFT), and even make tactical decisions about route planning to avoid unexpected threats. 

In a contested electronic warfare environment, where communication with the ground might be intermittent or impossible, this autonomous capability is not a luxury; it is a necessity. The drone will be able to execute its mission based on pre-set parameters and return home safely, all without a single human keystroke. This integration of Artificial Intelligence ensures that these platforms remain effective even in the “blinded” conditions of modern warfare . 

Navigating the Skepticism and the Road Ahead 

Of course, any discussion of Indian defense projects is incomplete without acknowledging the inherent skepticism. For every official announcement, there is a chorus of online commentators pointing to past delays. A quick look at defence forums reveals comments like, “Been listening about the ghatak ucav from the past 5 years or more” and “Nope its since 2009 Aura… as these sarkari dumb mediocre labs do to fool tax payers” . 

This skepticism is not without merit. The journey from a technology demonstrator (SWiFT in 2022) to a full-scale flying prototype (Ghatak) to squadron service has historically been a long and winding road in India. The AMCA itself, a crucial part of this ecosystem, is not expected to fly until 2036, which could impact the timeline for the “Loyal Wingman” drone designed to accompany it . 

However, there are reasons to believe this time is different. The funding model is more robust. The Ministry of Defence has sanctioned over ₹723 crore specifically for the KDE’s development and airworthiness, ensuring that the engine doesn’t die on the drawing board due to lack of funds . 

Furthermore, the public-private partnership is working. The involvement of private players like Godrej Aerospace in delivering production-standard engines is a massive step away from the old model where everything was done in-house by DRDO labs . This injects industrial efficiency and accountability into the process. 

A Family Born of Necessity 

The development of a family of stealth drones is not merely a technological vanity project; it is a strategic necessity. India’s adversaries possess dense and modern air defense networks. Sending a manned aircraft—even a stealthy one like the AMCA—against these networks in the initial hours of a conflict carries immense risk. 

The Ghatak and its larger siblings are the answer to this dilemma. They are the “first day of war” platforms, designed to clear the path. They are the affordable, expendable (though not disposable) assets that can attrit enemy defenses, allowing the more expensive manned fighters and their precious pilots to dominate the skies from Day Two onwards. 

Moreover, with the DPB’s recommendation for 60 Ghataks, the IAF is sending a clear signal that it is ready to embrace this new doctrine . It recognizes that future wars will be won by the force that best integrates manned and unmanned teams. 

In conclusion, India’s plan for a family of stealth drones, powered by the resurrected Kaveri engine and the advanced tech of the AMCA, represents a coming-of-age story for the nation’s defence industry. It is a story of learning from failure, leveraging every rupee of R&D, and thinking not just about the next platform, but the next generation of warfare. The journey from the SWiFT demonstrator to a 24-ton AI-powered loyal wingman is long, but for the first time, the flight path is clear, the engine is running, and the destination is in sight.