best thing to do is not get into a turning war with them fly low to the ground it will b harder to spot you get some distance and then get some alltitude line up and come in for another attack
seems to work best for me
have a look at this pdf file has loads of great facts and tips for air combat thanks for house md for pointing me in the right direction
http://web.comhem.se/~u85627360/inpursuit.pdf