The most efficent wind turbine
 

The Archimedes is a new windmill design meant to power small homes and apartments. With an 80 percent efficiency ratio, will this solve the world’s energy problems? Renewable energy is not necessarily free, as it does come with some costs, in terms of money spent for equipment, and other environmental costs. For example, windmills do [...]

http://vr-zone.com/articles/efficent...t-wind-turbine