Some things in these games are just over exaggerated. The prop effects in CLoD are one of them. Its seems that effects like these are created by folks who have never spent any time around real life aircraft. There is a reason spinners and props are painted on some aircraft - to give a visual cue when spinning. Walking into a spinning prop is a real danger and has killed and maimed more then a few. For example:
Texas Model Has 'Long Road to Recovery' After Walking Into Plane Propeller
Another thing that bugs me about these games is the some of the sound effects - like hearing another plane near or behind you. But whatever it is a game...
Wotan