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Windmill ship
A windmill ship, wind energy conversion system ship or wind energy harvester ship propels itself by use of a windmill to drive a propeller.
They use wind power〔(Windmill sailboats )〕 through a mechanical or electrical transmission to the propeller. Where transmission is electric, storage batteries may also be used to allow power generated at one time to be used for propulsion later on.
Windmill ships should not be confused with rotor ships, which instead rely on the Magnus effect for propulsion.
==Points of sail==
Because a windmill can rotate 360° into the wind, no matter what direction the ship is facing, a windmill ship can sail in any direction. In fact, because the power produced depends almost entirely on the apparent wind, they can produce the most power sailing directly upwind.〔(Windmill powered boats )〕〔(Windmill ship video demonstrating sail points and boat specifics )〕 Note that sailing upwind, while resulting in more power generation by the wind turbine, requires more power to be expended by the engine and thus it is still more efficient to sail down wind. To sail upwind, a conventional sailing vessel must tack across the wind.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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