PAK-FA / Sukhoi Su-57 - Updates and Discussions

If having an IIR AAM on a wing-tip increases RCS by 0.05m^2, how can an aircraft having an even larger IRST bubble on the front have an RCS of less than 0.001m^2? @vstol Jockey
 
BMD said:
If having an IIR AAM on a wing-tip increases RCS by 0.05m^2, how can an aircraft having an even larger IRST bubble on the front have an RCS of less than 0.001m^2? @vstol Jockey
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It depends on the aspect. A sphere has a fully curved surface so it has very low RCS compared to a radar antenna. ASRAAM missile has the least RCS of any missile in the world with 0.001m^2 RCS from the front. Its RCS is mainly due to the tail fins. Most other missiles have bigger and larger number of control surfaces which add to their RCS. the IRST of the Su-57 has same kind of coating as the canopy has to reduce RCS. So it is very much possible to reduce the RCS of even an IRST.
 
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vstol Jockey said:
It depends on the aspect. A sphere has a fully curved surface so it has very low RCS compared to a radar antenna. ASRAAM missile has the least RCS of any missile in the world with 0.001m^2 RCS from the front. Its RCS is mainly due to the tail fins. Most other missiles have bigger and larger number of control surfaces which add to their RCS. the IRST of the Su-57 has same kind of coating as the canopy has to reduce RCS. So it is very much possible to reduce the RCS of even an IRST.
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The tail fins are swept back and I'd swear you said before that they had an RCS or something like 0.01-0.1m^2. The canopy is swept back, the IRST system is facing straight forward. All I'm saying is show me another stealth aircraft with an IRST system that looks like that.
 
New sensor housing under nose.

1547830063682.png
 
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They seem to have covered over the exposed nacelles too although difficult to see from that angle.
 
BMD said:
New sensor housing under nose.

View attachment 4016
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Nothing new, seems like just the same 101KS-U DAS we've been seeing for years now. The configuration on the right -

suchoi-t-50-two-sensors-101ks-u-c-butowski-jpg-4860020_orig.jpg


Although it does seem somewhat bigger/more prominent on this image.

BMD said:
They seem to have covered over the exposed nacelles too although difficult to see from that angle.
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That little update happened almost 2 years ago. This image is from April 2017:

C_4qEOBXkAAYsq5.jpg
 
Maybe they'll even change the IRST so that it actually looks like a stealth aircraft some day.
 
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