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= Wind Energy =
== Summary ==
Because they have a smaller footprint, vertical-axis wind turbines are better suited to boats than horizontal wind turbines. They are somewhat less efficient but can take advantage of turbulent and gusty winds. Cost performance and size remain barriers. Small turbines around 600 W capacity cost USD $5,000 or more and have a spinning diameter around 2 m.
== Vertical Axis Wind Turbines ==
There isn't the space on a boat necessary for a horizontal-axis wind turbine (HAWT) for supplementary power. Even a small vertical-axis wind turbine (VAWT) is problematical. Think an egg beater, with the gearbox and generator located at the bottom of the mast. VAWTs are omnidirectional and can take advantage of turbulent and gusty winds because they require a lower wind speed to self-start. They rotate at 1/3 to 1/4 the speed of HAWTs, which reduces their noise and vibration levels.
