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The newer Su-57s have seen some major improvement. Most pictures taken of Felons (woodscrew express included) so far have been varying T-50 prototypes, each of which is pretty much a unique testbed. The Russians consider every one of these planes an Su-57, in spite of the fact that many are missing basic features such as external RAM, working IWBs and engine covers.The production version of the aircraft is likely coated in RAM[1] and supposedly has F-117 style intake covers to hide the turbine blades from radar[2].
These upgrades are still useless because Russia hasn't developed a missile capable if fitting inside them, meaning it functionally has the same radar signature as an Su-35s. Even when R-77M and the R-74M2 make it into service, by Sukhoi's own admission the smallest RCS they've managed to attain is 0.1m2. Which will give away it's position to any modern radar well before the Felon is in range with its own weapons. Sure, it's a major advantage to have against older sensors and lets the Felon get about half the distance to the target without being spotted, but it isn't enough to have the same insurmountable advantage the F-22A has over its opponents.
The plane's radar, the N036 Byelka-r[matard] is woefully out of date. The Byelka uses slot antennas which while cheap, restrict bandwith (ruining LPI fuctionality), and only has one frequency modulator for every 4 T/R nodes, giving it in effect only about 375 on it's main array For reference, the F-22A's radar the APG-77v1 has 1'956 nodes with notch antennas for greater bandwidth.
Tl;dr, the Su-57 isn't shitty because muh woodscrew, it's shitty because the Su-57 lacks the qualities that make the F-22 an air dominance fighter.
[1]https://www.thedefensepost.com/2023/04/05/russia-stealth-material/
[2]https://theaviationist.com/2020/12/13/lets-talk-about-the-su-57-and-the-radar-blockers-allegedly-sighted-for-the-first-time-inside-the-felons-air-intake/
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