drag2share: Eureka! A Whisper-Quiet Wind Turbine Based On Archimedes' Screw
Source: http://gizmodo.com/eureka-a-whisper-quiet-wind-turbine-based-on-archimede-1582606998
When they're standing out in a field, miles away from crowded urban centers, the sounds made by a wind turbine's blades aren't a big issue. But when they're perched atop a downtown building, they create noise pollution that's hard to ignore. A Rotterdam-based company might have found a solution, though, with a unique turbine design partially based on Archimedes' famous screw pump.
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