It seems highly unlikely the Su-35 would be given a choice or any warning if an F-22 was in theater.
You should not underestimate it. N035 is VERY powerful radar, and it can be able to catch F-22 from some decent ranges, at least not from perfect front. Plus IRTS cound provide some close warning capability.
More of the RUSSIA STRONK!!!111 crap.
The USAF has stated that the F-22 has an RCS equivalent to a metal marble from the front. What that means is (intentionally) ambiguous. It's a debate for seasoned experts exactly how many zeroes go after the decimal point.
N035 has a detection range of 400km against a target of unspecified RCS, but detection isn't the same as tracking or track while scan, let alone weapons lock. Engagement range for N035 is a mere 140km against a fighter-sized target.
"Fighter sized target" probably means something in the neighborhood of 10m^2 RCS in X-band.
Let's assume that the F-22 is merely as stealthy as Sukhoi claims the PAK-FA is; .1m^2. That's a factor of 100 smaller RCS.
The relation between RCS and detection range is a fourth power relationship, so a factor of 100 reduction in RCS translates to a factor of 3.16 reduction in detection range. So the SU-35 is down to 44km or so before it can shoot at a raptor from the front. Assuming the raptor is flying straight at the flanker and not making things difficult, e.g. by going below the flanker's radar horizon and forcing it to use doppler filtering (which will knock of 20% or so off the range of the flanker's radar), or engaging its jammer (AESA radars double as jammers with the right software control). That's well inside the maximum engagement envelope of the AIM-120C.
Let's assume that thirty-something years of experience and an order of magnitude better funding actually counts for something, and Lockheed Martin did better than merely matching the PAK-FA. Let's assume that the F-22 has an RCS of .01m^2. That's a factor of a thousand times smaller RCS than a typical fighter, which gives a detection range of 5.62 times smaller. That means it's 71 kilometers before the Bars radar can even see the F-22, assuming that 400km is also vs. a fighter-sized target. It's 24km before the SU-35 can guide a missile, which isn't just inside the envelope of an AIM-120, it's starting to get inside the envelope of an AIM-9X.
But ten centimeters is an awfully big marble. What if the F-22 has a frontal X-band RCS of just a centimeter? In that case, detection range is reduced by a nice, round factor of 10. The SU-35 is going to have trouble locking up the F-22 outside of visual range if that's the case.
That is not by any reasonable definition "decent ranges."
Jaro You cannot overcome laws of physics... and radar equation is just that... a physics... there is no miraculous technology that will make stealth obsolete, all "stealth killer" technologies come with huge downsides and constrains people promoting them completely ignore...
From what I understand from Ben Rich's book, stealth works in two dimensions - to the front, sides or back. It does not work up and it does not work down. How do I know that? Because Ben Rich says the surface has to be angled back 70 degrees from the emitter, and any plane’s topside or belly is a flat radar reflector. The plane uses a SAM map to weave a path between radars, such that the defending batteries are never close by. Directly below is dangerous because the belly of the plane allows a lock on – don’t ever fly over a SAM battery.
So what S-400 appears to do is use a low frequency radar to get a general location of the stealth aircraft (within an area of uncertainty of a few miles). It then it fires one or more very expensive active radar homing missiles in ballistic trajectories to the area of the target. It doesn’t need to know exactly where the plane is because the missiles themselves will determine that if they’re placed close enough for government work. Maybe the battery needs to bring two or three missiles in from different directions all at once so that no matter what the target does, at least one of the missiles can “see” it’s big, fat radar reflective belly or top. Or, maybe these newfangled Russian missile radars are so bloody good that if they’re coming straight down at a stealth aircraft, they can see it as the fighter shaped hole in the radar reflection off the ground below it. I don’t know. What I can tell you is that the Russians know the answer because they know the math, and they’re pouring more money into the S-400/500 than into the SU-35.
I think you're greatly overestimating how much velocity missiles lose when they turn.
Also, planes can roll.
Edited by Loopycrank, Yesterday, 04:35 PM.