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Why do most aircrafts have a specific shape?
Most airplanes have the same basic shape because it is the most effective. The body of the airplane or fuselage is shaped like a tube with a rounded nose so that it is aerodynamic, reducing the effect of drag. Wings are spread out from the sides with rounded tops to generate as much lift as possible to help the plane stay in the air. The shape of an airplane is designed to maximize the forces of lift and thrust while minimizing drag.