Wings!, how the hell do they work?

Hi there!, I´m back for another post. Today we´re talking about wings. We will talk about where they come from, how they work and what they are used for.
In order for me to explain how they work, I must explain where they come from.
Humans have always been fascinated with flight, from the earliest humans watching birds fly to kids today. It´s exciting and gives us more freedom, but for most of humanity´s existance, flight seemed impossible. Leonardo DaVinci had many cool and futuristic ideas, being maybe hundreds of years ahead of his time, but he didn´t have the technology to accomplish his dreams. It was only in the late 19th century that flight seemed more and more possible. It was in 1903 when the Wright brothers accompished the worlds first powered flight in a heavier than air vehicle. They discovered lift.
Lift is what makes planes and helicopters fly, and modern racecars super fast.

                                      One of the wright brothers´aircraft on a demonstration flight

Wings have evolved a lot since then, but they al use the same physics. SCIENCE FTW!

The way in which wings work is best seen if we see it´s cross-section, also known as it´s aerofoil.

 The photo above shows an aerofoil in a wind tunnel. What makes aircraft fly is the pressure difference between the top and the bottom of the wing. Due to the shape of the aerofoil, air at the bottom of the wing is forced to slow down in varying amounts(depending on the desired requirements of the design), thus creating a high pressure zone at the bottom of the wing. Something to note is that when fluids like air are slowed down abruptly, the fluid molecules behind it  will collide into the slowed down fluid, slowing it down. It´s almost like a chain reaction. And when you try to cram lots of stuff (fluids, or air in this case) it´s density, and subsequently it´s pressure will go up. That is good and all, but if the same happens on top of the wing, it cancels each other out and you won´t be flying very long, that´s called crashing and dying! What you need is that pressure difference I described earlier.

The wing must be shaped in a certain way so that process for creating high pressure in a fluid that I described earlier doesn´t happenon top of the wing. You must difuse the air, creating a low pressure zone (almost like a very small vacuum) on top of the wing. That´s why the streaks of smoke are no longer visible on top of the wing. It looks fuzzy because when a wing is agressively angled, the airflow seperates from the wing and creates what is known as form drag(a type of parasitic drag). If you don´t understand some of these terms, you can tell me in the comments and I will try to adress that if I can there, or in a later post.

This technique is used in airplane wings, helicopter blades(which is the fancy name for spinning helicopter wings) and racecars. Racecars make the high pressure zone above the car, making it "stick" to the ground. This effect is called "downforce" and I will talk about it in a later date. That´s it! Now you know(hopefully) how wings work. Next time you´re on an airplane and you ask your parents how an airplane flies, and they answer: magic!, you will be able to correct them! I hope you enjoyed, feel free to give feed back in the comments and ask questions. Bye.