Hey, There is a video available with regard to Propeller Design. http://www.youtube.com/watch?v=jpyZ3vTGct8&list=UU0GfNDj5JIoBWR-YUFQ_xMA The video shows how to create a parametric 2D profile definition in a few steps. This profile defintion will be connected to the blade object. The parametric profile is created with two Fsplines and an offset curve with some parameters which can be used in a variation or an optimization. Best Regards Karsten