lol ha a ahahah....there is a facility in the usof a that can and many technologys are out they can detect in america a sound of a bomb going of in london.......and the f22 will not shoot ME down as im not going to be innit...im not russian;)ill probnably steal one though........when radar waves scatter you need loadsa radars hence very very expenisve;)...............the PAK-FA is also the 5th gen hence stealth;);) the su37 is just a prototype thingi kind of...its like a concept model of a car they make a few and then mixand match bits fromt the otehr concepts..............heat although cooled down will still be hotter than air i admit you wont be able to see the burns from very large distances but large distances nevertheless ...........when radar waves are converted into heat they also produce some em waves and also when the plane goes very very fast eg supersonic it makes a pretty loud noise.....