Scalable wind turbine might fit on your roof

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(Left) Doug Selsam with a prototype 25-rotor turbine that can generate 3000 watts while the other end is held up by a balloon. Credit: Popular Science. (Right) Selsam holds a model with 14-inch rotors that can power the 50-watt headlight at his feet. ...
(Left) Doug Selsam with a prototype 25-rotor turbine that can generate 3,000 watts, while the other end is held up by a balloon. Credit: Popular Science. (Right) Selsam holds a model with 14-inch rotors that can power the 50-watt headlight at his feet. Credit: SpeakerFactory.net.
When you think of wind power, you probably picture gigantic wind turbines spinning gracefully in the middle of large open areas.


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