In China, Kite Day was on the ninth day of the ninth moon and was celebrated with kite-flying festivals. Today, we don't need a special day to fly kites and there are many kite-flying festivals throughout the year. Let's explore the aerodynamics of kites. They weigh more than the volume of the air they displace. They are flown at the end of a string, line or rope.
Kites are aerodynes.
In other words, they overcome the force of gravity and are kept in the air by the force of the wind or the forces of wind pressure on the kite. The aerodynamic force involved is called lift. Lift on a kite is perpendicular to the relative wind direction. It is the actual wind, the actual direction of wind and speed of the wind. The kite reacts to the wind pushing on it.