Originally Posted by satishkumarcsc
1- We may never get the parameters about the PAK-FA as they will be too sensitive for publication (at least for discussion fora) but apparently, the general word is that manuverbility has been kept as critical factor along with LO. The structure of J-20 also emphesises the same with optimazation of supersonice and subsonic manuverbility.
2- Well I still have doubts how much IRST would be successful against F-22. also considering the fact that USA has a long history of working with Infra red targeting systems (since early 80s) I think F-22 should have been optimized agsinst such targeting. Also as per simulation(Novalogic), F-22 can supercurise at 90% of engine power. combine this with exhaust cooling process installed in it, IRST will have very tough time. What reinforces my suspecion is that there hasent been an active reaction from USAF on this i.e. a "modernization" or stuff. So they have preety much safety in their bags.