Is the side slip on prop aircraft bug?

[gomwolf]

My English is sucks. So I hope you guys understand it.

 

My CH pro pedals arrived today. So I trying to adapt it. I didn't care slip indicate before but I found it occurring weirdly today. AFAIK, prop of Bf109 rotate to right and it make prop wash to right direction. So when I turn to right, side slip occurred to right and I have to kick the left rudder. When I turn to left, side slip occurred to left but prop wash almost offset it.(Of course it changed by power) However in this game side slip occurred opposite direction.

 

I attached some screenshots. On the right turn, that slip indicator ball have go to the left. On the left turn, offset side slip by prop wash.

 

P-51D have no sideslip on turn situation(Is it true in real history? It is insainly stable in turn), Fw190D-9 have same problem I think but it is fewer sideslip occured.

[amazingme]

I believe that ATA 1.8 has a lot to do with the prop wash and the instability in turns. It has a lot of hp and of course.. torque.