by Xpand » Fri Feb 03, 2012 8:26 pm
Depends on how you made the blades. If they are supposed to be animated, as in variable pitch blades, for example, you can use the "local" setting for the rotation axis. If you're using gmax/3ds max you just have to select the rotation tool and go to the roll down list next to it that says "view", click it and select local.