Navigation: LaesieWorks Identified Flying Objects How a wing works

 HOW A WING WORKS The main goal of a wing is to create a force that is equal to the weight of the aircraft but pointing in the opposite direction, so the thrust of the wing can lift the aircraft's weight. A wing flying through air reduces the air pressure above the wing a lot and increases the pressure under the wing a bit. How on earth is it possible for a Boeing 747 to take off in the air? It weighs tons! Space with highly pressurized air The most important to realize here, is the pressure of the air surrounding us. We live, without realizing it, in a part of space with highly pressurized air; the atmosphere, which is a thin layer around the Earth. The pressure at sea level is normally about 1 kgf (kilogram-force) per square centimeter, that is about 10.000 kgf per square meter! Reducing the pressure above 1 square meter wing 20%, will reduce the pressure force from 10000 kgf down to 8000 kgf. If the pressure at the bottom of the wing is 10% more, thus 11000 kgf, the wing's thrust is a force upwards of 11000-8000 = 3000 kgf. If the wing is big enough, it can lift a heavy craft. But how does a wing alter the pressure of the air? The wrong explanation of how a wing creates lift To understand how a wing creates lift, you first have to forget most of what you may have learned about it. The popular description of how a wing creates lift is wrong, and goes something like this: "Because the top of the wing is curved and the bottom is flat, the distance on top is longer and therefore the air on top has to go faster. Fast air has less pressure, thus the slower air on the bottom pushes the wing up" What is wrong about that? - Air doesn't have to go faster because of a longer path, there is no law in nature that states that air volumes have to reunite after being separated. In fact: the air doesn't reunite at the trailing edge of a wing. - There is no such thing as fast air. Speed is a relative thing, not a property of mass. Speed is a measure of how quickly the distance between two objects changes. Some examples of airfoils that do or do not produce lift:

 Both sides have the same distance Both sides have the same distance A longer distance on top Both sides have the same distance A really longer distance on top A typical airfoil A typical airfoil, upside down A wing flying up side down can produce upward thrust to lift the craft! (not very well, but it works)