Domestic fans....please help! Hey everyone. WE are currently undertaking an engineering project and need some simple, yet seemingly unobtainable, answers to some questions. The questions are regarding domestic electrical fans. If you have the answers to these questions, or any useful hints about wind power, please reply to this post or email me. 1. WHAT IS THE OPTIMUM BLADE ANGLE, SHAPE? 2. HOW EFFICIENT ARE THEY 3. WHAT KIND OF GENERATOR WOULD BE MOST SUITABLE AND MOST EFFICIENT 4. HOW DO THEY ACTUALLY WORK? If you could answer these questions or help us in any way please please get in touch as we have hit a bit of a wall and need a kick in the right direction. many thanks, anne and ol.