The takeoff of an airplane depends on the lift generated by the relative movement with the air, and the lift depends on the relative speed between the airplane and the air, not the relative speed between the airplane and the ground. If you take off against the wind, the taxiing speed of the plane is opposite to the wind speed, and the relative speed between the plane and the air is equal to the sum of the two.
At this time, the aircraft can get the lift needed to get off the ground at a small taxi speed. Therefore, compared with windless takeoff, the distance required for taking off against the wind will be shorter. On the contrary, if you take off with the wind, the plane will have to reach a great taxiing speed to get the lift needed to get off the ground, and the taxiing distance is also relatively long.
Flight principle?
The cross section of an airplane wing is generally blunt at the front end, sharp at the rear end, with an arched upper surface and a flat lower surface. When the same mass of air passes through the upper and lower surfaces of the wing at the same time, different flow velocities will be formed up and down the wing.
When the air passes through the upper surface of the wing, the speed is high and the pressure is low; When passing through the lower surface, the flow velocity is small and the pressure is high, so the plane will have an upward resultant force, that is, upward lift. Because of the lift, the plane can leave the ground and fly in the air. The faster the plane flies, the larger the wing area, and the greater the lift generated.
The direction of gravity is opposite to the lift. It is a downward force influenced by the gravity of the earth, which is influenced by the weight of the aircraft itself and the amount of fuel it carries.