On 9 April 2015 at 12:37, David VanHorn wrote: > I like hat mounted windmills. Much more steampunk. > Pack mounted wind turbines are almost viable. Almost. As long as you don't walk/jog downwind at about windspeed. Ocean going y achts that use WT's suffer much reduced output downwind when yacht speed is around wind speed so that effective wind velocity drops to about zero. Towed water power units are then more effective. You can get units which can be either wind or water powered. Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .