This is a wingless plane? What are these big boards? Are you kidding me? Ha ha, don't worry. It's really a wingless plane. Take a closer look at the wing area and wing load, zero and infinity. What's going on? This is actually very simple, as long as you understand the principle of aircraft wing lift. Aircraft lift is mainly produced by two principles: Bernoulli principle and Newton's third law. Bernoulli's principle shows that the fluid pressure is inversely related to the flow velocity, so the curvature of the upper surface of the wing is larger than that of the lower surface. In the same time, the distance of the air passing through the upper surface of the wing is larger than that of the air passing through the lower surface, so the speed is faster and the pressure is smaller; on the contrary, the speed of the lower surface is slower and the pressure is higher, which gives the wing an upward lifting force, that is, the so-called "lifting force". Newton's third law provides lift from another angle. Newton's third law shows that forces act on each other. Let's assume that the plane moves in a fast uniform straight line on a horizontal plane. According to Newton's second law, when the object moves in a uniform straight line, the combined external force is zero, so the resultant force of power and lift of the aircraft engine is equal to the resultant force of gravity and resistance. This "lift" is mainly provided by Bernoulli's principle, but not entirely, and part of it comes from resistance. When you look closely at the wing of an aircraft, you will find that the wing is inclined, it has an upward elevation angle, which is called "angle of attack". If the air drag acts on the lower surface of the wing with an angle of attack and the pressure direction is perpendicular to the contact surface, then according to the parallelogram law, the component force perpendicular to the vertical direction is equal to the drag multiplied by the sine of the angle of attack; the co