All i noticed was that the blades are facing towards the direction they are moving instead of away... And if they are set in an outwards manner, then they could be catching air and turning. Probably not as efficiently as http://www.youtube.com/watch?v=aM8PHGwGObI&feature=related but what does it matter?
Also, if its turning, then it must be turning the gears, and I right? If so, then it should be able to turn a griding stone.
Simple solution.. reverse it or reverse the blades, right?