As to the F-15 limit at Mach 2.5, note that the manual for the F-15C states that the aircraft is operationally limited to Mach 2.5. The implied maximum aerodynamic speed is Mach 2.6. And it’s with the older PW F100-220 engines. The latest 229s have about a 22% thrust increase, suggesting a 10% further increase in speed, so you can hit Mach 2.75.

No you can’t
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Agility matters a lot less when everyone has HOBS. The PL-10 purportedly can hit 180 degrees off bore-sight Likewise, as I’ve explained to FBW, you only need enough LO to stop the enemy from hitting you with AIM-120s at range

They can turn and are designed with stealth in mind unlike Mig-25, Mig-31 or SR-71

And once again, Boeing claims that the F-15 can hit 3000 km/h.

They also stated F-15 limit at Mach 2.5 , likely the site author get lazy and took 1220*2.5 = 3050 km/h without consider that speed of sound change with altitude.Regardless, nothing is more accurate than flight manual
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Mach 3 isn’t such a big challenge, ultimately. The technical specifications on the F-15 show that Boeing has an air superiority aircraft, albeit of the fourth generation, that can achieve Mach 3 speeds.

Mach 3 is a big challenge if you want an LO, agile fighter, and F-15 can’t reach Mach 3
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I’m really not sure about whether the J-20’s top speed is a mistake. Remember, the J-20 has a higher fineness ratio than the F-22 (1.62 vs 1.4), and it has a higher angle of wing sweep.

Mirage IV have higher fineness ratio and higher wing sweep than Mig-25, doesn’t mean it is faster. A fixed inlet are not meant to provide good pressure recovery at very high speed like > Mach2.

About the combat uses of high speed; the trick is that stealth fighters aren’t going to be detecting each other at 30-45km. In actuality, AEW&C and ground-tracking counter-stealth radars will be giving detection, but not weapons-quality tracks, far in advance of 30-45km.
If we assume, say, a Su-57 moving at 20k meters and Mach 2.8, and launching a R-74M2 at a F-35 moving at Mach .9 at 10 km altitude, the R-74M2 will go further than any AIM-9X BLK2s

Your assumption doesn’t make any sense, since when can Su-57 fly at Mach 2.8?. Why only Su-57 accelerate to high speed and high altitude while F-35 is still at its cruising speed and altitude?. Fly fast (especially Mach 2.8 fast) make you very easy to detect by Infrared sensor and radar.

Of course a F-35 would be in a dire situation when confronted with such a plane, not being capable of engaging and disengaging due to inferior kinematics and ceiling and having a relatively low A2A payload of MRAAM with only Mach 4 speed. In comparison, Su-57 would count on up to 4 x LRAAM with modern and powerful seekers and Mach 6 capable.

IMHO, RVV-BD is faster but Meteor can sustain high speed all the way, JNAAM based on Meteor airframe but with an AESA seeker
http://www.airrecognition.com/index.php/archive-world-worldwide-news-air-force-aviation-aerospace-air-military-defence-industry/global-defense-security-news/global-news-2017/august/3704-japan-plans-to-invest-66mn-in-jnaam-missile-development-project.html

Just a question. Using a linear drag equation (as opposed to detailed non-linear, i.e, Cd drops as speed increases), the Su-57 seems to be able to hit a max speed of around Mach 2.7 or 2.8.

Is this the real secret of the Su-57? I.e, it’s “stealthy”, in terms of being LO, but it’s willing to sacrifice stealth for speed?

We know with the F-22, it’s supposed to be able to reach Mach 2.45, presumably at altitude, but it avoids hitting high speeds due to damage to composites and stealth coatings. With the J-20, we recently received a report that it’s capable of a Mach 2.9 max speed. With regard to the Su-57, the report of Mach 2.1 supercruise implies that it should be able to hit Mach 2.76 (as a minimum).

Is that the actual secret of the Su-57; it’s less a replacement for the Su-27, and more a replacement for the MiG-31?

That’s to say, let’s say the Su-57 is engaging F-35s. Since the F-35 is relatively slow and unagile, it has a relatively low NEZ factor. The Su-57, once the F-35 has been detected, scoots rapidly at the F-35, reaching its maximum speed of Mach 2.7, then loosing R-74 IR missiles at the F-35, hopefully from outside its targeting, but not detection range. It then zoom climbs, attempting to shed off as much speed as possible, then dives to resume its maximum speed, outrunning retaliating AIM-120s.

The alleged leak of J-20 top speed was confirmed to be a mistake https://forums.spacebattles.com/threads/chengdu-j-20-top-speed-leaked.667711/
Moreover, the distance when stealth aircraft can detect each other 30-45 km , they won’t have enough time to accelerate to stop speed.

The same old posters/F16.net types polluting and flaming the topic.
The same posters who flamingly denigrate, and always include a certain large industrial fighter programme in every single post

AJ wrote loads of sh.. t but he isn’t the only poster polluting this thread, the constant sh… t from KGB or panzerfeist isn’t any better. Constant propaganda versus propaganda and screaming contest.

Which fighter programme are you referring to, Su-57? All the major fighter programmes get a lot of stick on this forum – much of it well deserved. Have you ever visited an F-35 thread on this forum?

Agree, the trash talk and insults in previous F-35 threads were dozens times worse than this but they have good information sometimes.

You cannot interleave anything between emission and reception of reflected signal because do not know how long the return will be. (or on very pculiar modes)

You can interleave if you know the exact waveform you used, that also how pulse compression work, you uses matched filter

If ASQ-239 has active antennas, the ones pictured in an earlier post is not one of them.

and you know that how?

Yet there have been contemporary US fighters which had internal jammers (F/A-18) or internal IRST/FLIR (F-14). The reason why those fighters you mentioned did not have internal jammers was simple – there was no requirement when they were designed, and once such requirement came up, those planes had too little internal space to effectively install jammers, or it would have required too costly modifications.

F-14 and F-18 are bigger aircraft and don’t have to pay attention to weight as much as F-16 or AV-8B