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   ocr: What makes a windmill turn? Wind on the island turns the sails of the windmill. This allows the islanders, who are strapped to the sails, to catch the balls as they go by. Windmills used to catch the wind with sails made of cloth or wooden slats. These mills were mostly used to grind wheat or corn. SAILS TURNING IN ITHE WIND Modern windmills, known as wind turbines, have rotor blades, instead of sails, that look just like the blades of an airplane propeller. à - L f - - BLADE ROTOR A wind turbine uses the energy of wind to make electricity for factories, offices, schools, and home.