A propeller in an aircraft scoops air, just like it scoops water in a ship. As in a wind mill, the blades of a propeller are arranged in the form of a star around a rotating shaft. They are shaped and aligned in such a way that the air falls diagonally on them and flows along them. This creates a strong air flow that gives the aircrafts but also by hovercrafts, which can travel over meadows or frozen water.
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