Thank you for response, sorry I it seems I did not make my self clear , by professional i mean opinion of Virtual pilots not developers:) I mean a lot of you spent plenty of time in large variety of flight sims I believe. starting from Janes f/a-18 , FSX, Lock on, Falcon BMS, Superbug, and Finally DCS, so It would not be difficult for you to spot scripted behavior of flight model . So what you are saying that flight model is pretty much realistic and avionics , radar performance is close to real. the question I am asking because I was confused on the forum that there were discussions saying that Mig was flying tail front and performing cobra ,etc, so I was thinking maybe there are a lot of mistakes in flight model and this was a bit depressing. and another interesting thing is when I put Mig-21 AI vs F-86 AI at same level , F-86 outperformed in Gunzo Mig-21 , is this real ?