First, the role of an airplane wing is to design it to be suitable for flight and have a fixed "airfoil". From the leading edge to the trailing edge of the wing, the upper surface of the wing is convex and the lower surface is relatively flat. When the airflow flows above the wing, it is divided into upward airflow and downward airflow by the wing, rejoins at the trailing edge of the wing and flows backward. Because the upper surface of the wing is designed with protrusions and the airflow tube on the upper surface is relatively thin, the speed is high and the pressure is low. On the other hand, the airflow duct on the lower surface is thick and slow, and the pressure is high, which causes the pressure difference between the upper and lower surfaces of the wing. (It can also be popularly understood that air flows for a certain distance on the upper surface of the wing, but at the rear of the wing, it must meet the airflow on the lower surface, that is, the airflow on the upper and lower surfaces flows through the wing at the same time, so naturally the airflow on the upper surface is high in speed and low in pressure). This pressure difference provides lift for the aircraft. Lift makes it possible for an airplane to fly in the air.
Second, the design principle of the wing The main function of the wing is to generate lift and support the aircraft to fly in the air; At the same time, it also played a certain role in stability and manipulation. It is an indispensable part of the plane. Wings are usually equipped with the main control surface of aircraft: ailerons, and auxiliary control mechanisms, such as flaps and slats. In addition, aircraft equipment such as engine and landing gear can be installed on the wing, and the main internal space of the wing can be used as a fuel tank for storing fuel after sealing.
When the plane moves forward in the air, it can only fly off the ground if it reaches a certain speed and state. Even a helicopter can only take off by aerodynamics, that is, the rotor rotates to a certain speed and reaches a certain lift. When the airflow is cut off, the airfoil of the aircraft wing will generate lift due to the different pressures on the upper and lower surfaces of the aircraft wing. The higher the cutting airflow speed, the greater the pressure difference and the greater the lifting force. The cutting airflow speed is airspeed. When the airspeed reaches a certain value and the lift is equal to the aircraft's own gravity, the aircraft will reach the critical value of takeoff.