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Felon
The Sukhoi Su-57 (NATO reporting name: Felon) is a twin-engine stealth multirole fighter aircraft developed by Sukhoi. It is the product of the PAK FA (”prospective aeronautical complex of front-line air forces”) programme, which was initiated in 1999 as a more modern and affordable alternative to the Mikoyan Project 1.44/1.42. Sukhoi’s internal designation for the aircraft is T-50. The Su-57 is the first aircraft in Russian military service designed with stealth technology and is intended to be the basis for a family of stealth combat aircraft.
According to Sukhoi, the Su-57’s radar cross section (RCS) is reduced to an average figure of 0.3-0.4m2 compared to 15m2 for the Su-27. As explained by Piotr Butowski in his book Russia’s Warplanes, Volume 1, the main solution to reduce radar visibility is internal carriage of weapons. Radar blockers reduce reflections from the engine inlet guide vanes and are installed in the engine air intake ducts. The shape of the airframe has been selected to reduce the number of directions in which electro-magnetic waves are reflected, and to ensure these directions are the safest.
Directed Infrared Counter Measures
Other interesting features of the Su-57 that no other fighter jet has are the longitudinally arranged internal weapons bays and the 101KS-O DIRCM (Directed Infrared Counter Measures).
‘Technically this feature is seen on other turbine powered aircraft,’ Connor Dalton, aircraft and incidents researcher, said on Quora. ‘It’s just never appeared on anything outside of heavy lift transports, and helicopters prior to the Su-57.
‘DIRCM consists of two laser emitting turrets, with one placed behind the cockpit on the dorsal side, and the other beneath the cockpit on the ventral side. The function of the system is relatively straight forwards. When an IR missile is spotted, the lasers quickly aim for the missiles seeker system, blinding it and preventing it from being able to guide to the targeted aircraft.
Su-57, the only Fighter with DIRCM
‘The thing is, the system has never previously been seen outside of transports and helicopters, and has only ever been placed on the ventral side in the past, as a defense against MANPADS.’
Dalton concludes:
‘So, the presence of the dorsal mounting, and on a fighter no less means that not only is this the first DIRCM system ever put into a fighter, it’s one of the first DIRCM systems ever made with the goal of combating air to air missiles.’
Photo credit: Chinese Internet and Sukhoi
