Who told you HDI is equal to R&D capability and productivity on weapon industry? Especially on new tech and gears?
Manufacture Output reflects production capabilities.
In this thread, you mentioned Brazil, Mexicon, Russia, India... interesting coincidence i didn't realized you picked the low end on purpose ^_^ ...
https://www.brookings.edu/research/...card-how-the-us-compares-to-18-other-nations/
And R&D investment reflects how many new tech you would get in next 5-10 yrs.
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You still do not understand something, experience and intelligence are not gotten by money, in fact even Americans need sometimes adapt foreign technology because you invest the more you also waste more.
You are not going to especific aeronautical technical aspects but you go into economics and distractors.
Serbia downed 2 F-117s, one of them downed over its territory and one came to base but was rendered a loss, this is admitted by the USAF, Serbia downed with intelligence, out foxing more powerful nation with an old radar and SAM
Why because stealth is not what you think.
Stealth is shorter range detectability, but is dependant upon the power density of the radar, the direction of the target, the number of reflectors, the reflecting surface area.
The math can not be lied, you want to excuse your ignorance, moving the subject to unrelated topics.
The fact is J-20, F-22 and Su-57 represent different approaches to a 5th generation.
F-22 is a ultra sophisticated and expensive machine where stealth was prioritized, later high speed and later maneouvrability.
Su-57, is high speed first, later Stealth, later maneouvrability, later STOL.
J-20 is prioritized stealth, maneouvrability, later speed and later STOL.
You do not understand why
but if you read the Su-57 patent and have watched Russian documentaries you understand what is its philosophy.
It has variable geometry intake that has a design limit of Mach 3.
T-30 engines are ranked 5th generation plus plus engines, they are better than 117 of 15 tonnes of thrust.
Russia has very powerful engines just see what powered MiG-31, Tu-22M or Yak-141, however Type 30 is new because is smaller and more economical only that, it generates more power at lower fuel consumption.
So speed, STOL and Supermaneouvrability is assured, basically they already did what China can not do with WS-15
Su-57 with type 30 engines can go at supercruise speed higher than Su-35 and the current Su-57s, basically is an engine as good as F135 or more.
So J-20 can not compete with it, DSI intakes top at Mach 1.8, the recomended speed is Mach 1.5.
Examples JF-17, J-10C and F-35.
You do not know but if it tries to go faster there are issues that affect one is fuel consumtion, it will need afterburner, easy to spot, second it can damage the engines.
So J-20 flies without afterburner a low subsonic speed with Al-31 and if WS-10C is good maybe can compete with F-35.
However it has more weapons and Fuel than F-35 so China designed a Big F-35 because the Small F-35 aka J-31 is crap.
Su-57 will fly faster, so it is designed to down F-22 as its main objective, so it needs to be fast, and have faster top speed, so it can accelerate better than F-22 and have a faster top speed.
So Su-57 is designed to be competitive frontally and if fired upon escape and leave the area with speed, so J-20 can not chase it.
missiles are fast but have few seconds of flying time, and are easy to shake because if you are fast they fly few seconds and have less agility.
So get it speed is first, because as MiG-25 shown speed is life, but in close combat Su-27 will have better turn rate due to higher thrust to weight.
what philosophy is better depends in tactics luck and only in combat can be proven.
www.airforcemag.com
