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 aircraft the required thrust. This principle is used not just by the smaller aircrafts but also by hovercrafts, which can travel over meadows or frozen water.
