The buckets were traditionally made of wood or clay. These windmills remained in use until the 1950s, and many of the towers are still standing. Eventually, steel blades and steel towers replaced wooden construction, and at their peak in 1930, an estimated 600,000 units were in use, with capacity equivalent water pumping system using wind power pdf 150 megawatts.
Very large lighter wind pumps in Australia directly crank the pump with the rotor of the windmill. Extra back gearing between small rotors for high wind areas and the pump crank prevents trying to push the pump rods down on the downstroke faster than they can fall by gravity. Today, rising energy costs and improved pumping technology are increasing interest in the use of this once declining technology. Many of the original windmills still stand in a derelict state although some have been restored. Australia, and on farms and ranches in the central plains and Southwest of the United States. In South Africa and Namibia thousands of windpumps are still operating. These are mostly used to provide water for human use as well as drinking water for large sheep stocks.
African development of windpump technologies. Kenyan company Bobs Harries Engineering Ltd for the development of the Kijito windpumps. To construct a windpump, the bladed rotor needs to be matched to the pump. Wind powered water pump on Oak Park Farm, Shedd, Oregon.