A properly designed wind pump begins working in a 3-4 mph (5 to 6.5 km/h) wind. Wind pumps require little maintenance - usually only a change of gear box oil annually. For a century or more that many of these humble windmills were in use, they withstood whatever elements barreled down on them and reliably provided the essential stream of well water that kept families and herds alive. At their peak in 1930, an estimated 600,000 windmills were in use in the United States. An estimated 60,000 wind pumps are still in use. They are particularly attractive for use at remote sites where electric power is not available and maintenance is difficult to provide.
Now, after years of relative anonymity, the humble windmill is making a comeback, partly for its beauty and partly because of the demand for alternatives to traditional energy suppliers.
© Christine Till - CT-Graphics
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