SOURCE: AFI
Hindustan Aeronautics Limited (HAL) is actively exploring engine options for its HLFT-42, a next-generation supersonic lead-in fighter trainer jet. The HLFT-42 is being developed to serve as an advanced training platform for pilots transitioning to India’s upcoming Tejas Mk2 and Advanced Medium Combat Aircraft (AMCA), preparing them for operating 4.5 and 5th generation fighter jets. With a maximum takeoff weight of 16.5 tons, the HLFT-42 is only one ton lighter than the Tejas Mk2, making engine selection crucial for ensuring optimal performance and cost-efficiency.
Initially, the General Electric F414 engine, which powers the Tejas Mk2, was considered a strong candidate for the HLFT-42. However, according to HAL officials, the company is not keen on using the same engine for the new trainer jet. Speaking to idrw.org at Aero India 2023, HAL representatives confirmed their preference for a more powerful engine that could deliver the thrust needed for supersonic training and combat readiness without compromising cost-effectiveness.
While the F414 engine delivers 98kN of thrust, HAL is reportedly aiming for a more powerful engine to meet the HLFT-42’s specific requirements. The upcoming 110kN engine for the AMCA program has been considered, but its suitability for the HLFT-42 is under question due to the high development costs associated with its 5th-generation capabilities. This engine is being designed with the stealthy AMCA in mind, and adapting it for the trainer jet could result in increased costs—something HAL is looking to avoid for a platform meant to serve primarily as a trainer.
One alternative that has emerged as a potential candidate is the AL-31F engine, a Russian-designed engine currently powering the Indian Air Force’s (IAF) Su-30MKI fleet. The AL-31F produces a thrust of 123kN and has proven itself in various combat roles, including on the Su-27 and Su-30 aircraft. Its relatively low cost of around $10.8 million per unit makes it an attractive option for the HLFT-42, which needs a reliable, high-performance engine without the price tag associated with next-gen, 5th-generation fighter engines.
One alternative that has emerged as a potential candidate is the AL-31F engine, a Russian-designed engine currently powering the Indian Air Force’s (IAF) Su-30MKI fleet. The AL-31F produces a thrust of 123kN and has proven itself in various combat roles, including on the Su-27 and Su-30 aircraft. Its relatively low cost of around $10.8 million per unit makes it an attractive option for the HLFT-42, which needs a reliable, high-performance engine without the price tag associated with next-gen, 5th-generation fighter engines.
Russia has also demonstrated the versatility of the AL-31F engine, particularly when it was fitted to a MiG-27 aircraft as part of a demonstration. The trial showed promising results, with enhanced performance compared to older engines. This flexibility further enhances the engine’s credentials as a potential powerplant for the HLFT-42 for a Single Engine fighter program.
As HAL navigates the engine selection process, the decision will hinge on balancing the need for performance with cost constraints. The HLFT-42 is envisioned as a key component of India’s advanced fighter pilot training pipeline, bridging the gap between basic trainers and frontline combat aircraft. With the Tejas Mk2 and AMCA set to dominate future IAF squadrons, the HLFT-42 must be equipped with an engine that not only provides the necessary power for supersonic training but also keeps operational costs in check.