India's AMCA Engine Quest

India's ambitious Advanced Medium Combat Aircraft (AMCA) program, aimed at developing a 5.5-generation stealth fighter, is at a pivotal juncture as the nation intensifies its search for a powerful and reliable engine. The success of the AMCA, a cornerstone of India's indigenous defense modernization, hinges on securing a suitable engine with cutting-edge technology, ideally with significant transfer of technology (ToT) and full intellectual property rights (IPR).

The AMCA is envisioned as a twin-engine, multi-role stealth aircraft with supercruise capability (sustained supersonic flight without afterburners), advanced avionics, and internal weapons carriage. While the initial AMCA Mk1 variant is expected to be powered by the General Electric (GE) F414 engine (in the 98 kN thrust class), the more advanced AMCA Mk2 will require a higher thrust engine, in the 110-130 kN class, to truly achieve its 5.5-generation capabilities.

The Gas Turbine Research Establishment (GTRE), under the Defence Research and Development Organisation (DRDO), is evaluating proposals from several global aerospace giants.

The Leading Contenders: GE, Safran, and Rolls-Royce

Three major international players have been at the forefront of discussions for co-developing the AMCA's next-generation engine:

1. General Electric (GE) Aerospace (USA): GE's F414 engine is already slated for the Tejas Mk2 and the initial AMCA Mk1. While a deal for 80% ToT for the F414 was announced in June 2023, there have been concerns over delays in technology transfer and supplies. GE has also explored a more powerful F414 Enhanced Durability Engine (EDE) or an Enhanced Performance Engine (EPE) version, potentially reaching 120 kN thrust, and has discussed deeper collaboration on a new engine based on the F414 platform.
2. Safran (France): Leveraging its existing partnership with India through the Rafale's M88 engine, Safran has proposed a clean-sheet 110-130 kN engine with Variable Cycle Engine (VCE) technology. Crucially, Safran has now offered 100% Transfer of Technology (ToT) and full IPR ownership, revising its earlier stance of retaining partial IPR. This commitment to full IPR is vital for India's self-reliance goals.
3. Rolls-Royce (United Kingdom): Rolls-Royce has presented a proposal to co-develop a bespoke 110 kN engine specifically for the AMCA, distinct from its engine for the Global Combat Air Programme (GCAP). Their offer includes 100% IPR ownership for India, full ToT, and support for establishing local manufacturing facilities. Rolls-Royce also boasts advanced technologies like VCE and has proposed developing a family of high-thrust turbofan engines (140-280 kN) from the AMCA engine's core, offering broader applications for India's military and civilian aerospace ambitions.

GTRE's recommendation will hinge on factors like the extent of ToT, IPR ownership, technical feasibility, and strategic alignment with India's "Aatmanirbhar Bharat" (self-reliant India) initiative.

The Japanese Offer: IHI XF9-1 Enters the Fray

In a significant development, Japan has officially entered the high-stakes engine competition, offering its advanced IHI XF9-1 turbofan engine for co-development and local production. This move signals a strategic pivot in Japan's defense technology transfer policies and strengthens Indo-Pacific security cooperation.

The IHI XF9-1, developed by IHI Corporation and Japan's Acquisition, Technology & Logistics Agency (ATLA), is one of the most advanced low-bypass afterburning turbofan engines globally, originally designed for Japan's indigenous F-X (F-3) stealth fighter program.

Key features of the Japanese offer:

• Cutting-Edge Technology: The XF9-1 boasts advanced thrust-to-weight ratios, scalability, and cutting-edge heat-resistant materials (withstanding turbine inlet temperatures of 1,800 degrees Celsius).
• Performance: It currently produces over 107 kN (11 tons) of dry thrust and 147 kN (15 tons) with afterburner, with a potential to scale beyond 196 kN (20 tons) in future iterations. While its current dry thrust is higher than AMCA's supercruise requirement, it can be optimized for India's specific needs.
• Stealth Optimization: The engine incorporates sophisticated design elements like inlet vanes to disrupt radar reflections, contributing to the overall stealth profile of an aircraft. Its slim design maximizes internal fuel and weapons carriage.
• Technology Transfer and Local Production: Japan's proposal emphasizes comprehensive technology transfer that could enable India to establish domestic engine manufacturing capabilities, aligning with India's self-reliance objectives.
• Strategic Alignment: This offer enhances Indo-Japanese strategic ties and adds geopolitical weight to India's indigenous fifth-generation push, particularly in the Indo-Pacific region.

The entry of Japan with a formidable technical offer intensifies the competition, providing India with a wider array of options to consider for its critical AMCA program.

The Road Ahead

India's decision on the AMCA engine partner is crucial not only for the fighter jet's performance but also for the nation's long-term goal of achieving self-sufficiency in aero-engine design and manufacturing – a domain where it has historically faced challenges, as evidenced by the setbacks of the indigenous Kaveri engine program.

The Indian government's commitment, including approving an initial budget for five AMCA prototypes with a first flight expected by 2028 and serial production by 2035, underscores the urgency. The final selection will likely be a strategic choice balancing technological superiority, the extent of genuine technology transfer, IPR ownership, and geopolitical alignment, ensuring that the AMCA becomes a truly advanced and indigenously sustainable combat platform for the Indian Air Force.