Russian Su-57M Fighter with New Engine to Enter Service in 2025

Russia's Su-57 fighter will be upgraded with an all-new engine—the AL-51F—and enter service as the Su-57M.

Having undergone flight tests since October 2022, the commencement of deliveries is expected by 2025, Russia’s topcor.ru reported, citing by Military Watch magazine.

The AL-51F engine, initially designated "Product 30" during development and later named "Saturn-30," is set to replace the existing AL-41F1, promising notable performance improvements. With a thrust of 18,000 kgf, compared to the previous 15,000 kgf, the Su-57M's total thrust is anticipated to reach 36,000 kgf with its twin engines.

Experts project that this upgrade will result in a significant increase in the fighter's maximum and supersonic cruising speed. The Su-57M is expected to achieve speeds of up to 2950 km/h, a substantial upgrade from its current 2550 km/h, aligning it with the capabilities of the MiG-31BM long-range interceptor.

The enhanced thrust-to-weight ratio at normal take-off weight, in conjunction with the AL-51F engine, facilitates high-energy maneuvering, enabling the Su-57M to execute steady turns in the pitch plane at an angular velocity of approximately 27-30 degrees/s. This maneuverability, coupled with features like a thrust vector deflection system, digital emulsion drive, load-bearing body configuration, and advanced aerodynamics, positions the Su-57M with a tactical advantage in close combat scenarios.

Furthermore, the Su-57M's flight range is expected to increase by almost 10%, thanks to the AL-51F engine. The rate of climb is set to surge from 330-335 to 370-375 m/s, allowing for rapid ascension to altitudes ranging from 13,500-18,500 m. This heightened climb rate, combined with the deployment of Izdeliye-180 and R-37M air-to-air missiles, enhances the Su-57M's ability to intercept airborne targets at maximum distances of 180 and 250-270 km, respectively.

Despite historical delays in the Russian fighter aircraft industry, Military Watch Magazine suggests that the Su-57M is likely to see deliveries before 2027.