Kaveri Engine Update: India marked a significant milestone in its indigenous defence technology programme this week as Defence Minister Rajnath Singh observed a successful full afterburner trial of the Kaveri jet engine at the Gas Turbine Research Establishment (GTRE) in Bengaluru on February 16. The long-running Kaveri engine project, led by DRDO, has faced challenges for years, particularly in achieving adequate “wet thrust” — the additional power generated when fuel is injected into the exhaust stream through an afterburner.
Earlier configurations were limited to around 73 kilonewtons of thrust, which was insufficient for modern supersonic fighter aircraft requirements. However, the latest test incorporated a newly engineered afterburner module developed with technical support from BrahMos Aerospace, aiming to boost output to approximately 81–83 kilonewtons, bringing it close to the performance range of the General Electric F404 engine that powers India’s HAL Tejas Mk1 fleet.
Prior to the afterburner integration, the core “Dry Kaveri” engine had already demonstrated stable performance of nearly 49–51 kilonewtons during ground and simulated high-altitude trials, and it is being considered for India’s stealth unmanned combat aerial vehicle programme, including the Ghatak UCAV. The successful afterburner validation now renews prospects of adapting the engine for future manned fighter platforms such as upgraded Tejas variants and potentially contributing to the Advanced Medium Combat Aircraft (AMCA) development effort.
Defence Minister Rajnath Singh emphasized that mastering advanced jet engine propulsion is critical for India’s strategic autonomy, noting that only a handful of nations currently possess complete indigenous capability in this complex field, and urged scientists to accelerate progress using emerging technologies like artificial intelligence, advanced metallurgy, and next-generation propulsion concepts to ensure long-term self-reliance in defence aerospace manufacturing.
Kaveri Engine Update Till Now
PTC Industries has received a Letter of Technical Acceptance from CEMILAC (DRDO), allowing the company to manufacture the titanium castings required for the Kaveri Derivative Engine (KDE-2) in India. Significantly, PTC has also developed titanium castings for the Oil Tank Assembly in collaboration with GTRE. This step is considered crucial in strengthening the country’s jet engine technology.
The company has also received an order to manufacture single-crystal turbine blades for the KDE-2, a crucial component in enhancing the performance of any jet engine. All of this manufacturing is taking place at PTC’s high-tech Strategic Materials Technology Complex in Lucknow, which spans 50 acres and has the capacity to produce 6,000 tons of aviation-grade titanium and superalloys annually.
The partnership between PTC and BDL is also a major step towards fully indigenizing missile and propulsion systems in the country. Defence Minister Rajnath Singh has also described this facility as a strong foundation for India’s self-reliance in defence technology.
DRDO’s Director General of Aeronautical Systems K. Rajalakshmi Menon recently stated that the Kaveri Engine will now be tested on the Manned Platform (LCA-Tejas). This is aimed at completing the end-to-end integration loop and giving the team the last mile of confidence that India has successfully developed an indigenous aero engine that has been integrated and tested not only through ground trials but also on a manned fighter jet. This step will validate India’s aero engine development capability and establish a strong technological benchmark globally.
India’s Kaveri Derivative Engine (KDE) is being developed specifically for the Ghatak Stealth UCAV (Unmanned Combat Aerial Vehicle). It is a non-afterburning engine designed to offer a stealth profile, improved fuel efficiency, and support long-endurance missions at high altitudes. It has a dry thrust capacity of approximately 49–55 kN and incorporates advanced alloys and a new fan architecture, which will enhance the performance and operational reliability of the Ghatak UCAV.
Technical Challenges (Kaveri Engine Update)
The thrust requirement was a major obstacle in the development of the Kaveri engine. Fighter jets require 85 kN of afterburner thrust, while the Kaveri could only deliver 49 kN of dry thrust. Furthermore, cooling the turbines at temperatures exceeding 1,400°C and making the rotor design efficient proved extremely difficult. The lack of altitude testing and flight-test bed trials also repeatedly delayed the project.
Kaveri Derivative Engine and UCAV
A new variant of the Kaveri engine, the Kaveri Derivative Engine (KDE), will be used in the stealth UCAV. This dry engine produces 49 kN of thrust and can achieve Mach 0.9 speed, 13,000 m altitude, and 2 hours of endurance. The UCAV incorporates stealth features such as a serpentine air intake and a distortion-tolerant fan. The engine operates without afterburner, which is crucial for stealth capability.
Kaveri Engine Derivatives
Not only UCAVs but many other derivatives have also been developed from the Kaveri engine. This includes the Kaveri Marine Gas Turbine, which is being developed for naval propulsion. Apart from this, turbochargers for armoured fighting vehicles and solid propellants for rockets and missiles are also being developed.
An indigenous aero engine is very important for India from a strategic point of view. This will reduce foreign dependency and increase supply chain security. For example, LCA production was affected due to a delay in the supply of GE F-404 engines, which weakened the operational preparedness of the IAF. Aero engine R&D will also give rise to new jobs and innovations in metallurgy, advanced materials, and precision manufacturing.
