I am currently finishing a two year engineering course on wind turbine tech. we had a module on 3d desingn (solidworks) and for one of the assignments we designed a scaled down turbine blade , printed it and tested it in the college wind tunnel recording rpm. Amazingly i made an rpm reading of 80rpm on my turbine with which i was well pleased....
This instructable will guide you on the designing of the blade using solidworks and i assume you have some basic experience if not on solidworks then some other 3d package. If not dont frete i have uploaded the screen shots i used in a.doc file along with the actual solidworks Part drawing. Good Luck!
Step 1: Drawing the turbine blade
Step 2: Inserting the Picture
Step 3: Stations
Now using lines, arcs or splines trace over the outside of the picture using the points as joints, then delete the picture you inserted to reveal the outline sketch of your blade, do this in the side panel.