Years ago people used wind only for running windmills, but today we have large wind power plants with triple-blade rotors. These power plants make electricity which can be used for residential as well as industrial purposes. The power of wind can be observed in nature too – it forms huge rocky arches or impressive sand dunes. We can feel it even while sailing, mainly while sailing at ‘high wind’. The importance of wind is also felt when sailors have to come to an involuntary stop in the windless areas of the subtropical calms.
