If you're about fed up, rest assured that even engineers still argue over the details of how airplanes fly and what terms to use. The Newtonian idea is this: Air flowing over the wing is ultimately deflected downward by the angle of the wing, and Newton said there has to be an equal and opposite reaction, so the wing is forced upward. So the area above the wing is often said to have less pressure than the area below the wing, creating lift.Īgain, the reality is more complex, and Newton's laws are typically preferred over the Bernoulli principle to explain lift. But in fact, parcels of air do not join back up in any uniform manner.įaster-moving air has less pressure (this is often called the Bernoulli principle). You'll often hear that the two streams meet up again in the back, as depicted here, because the air passing over the top has to travel farther than the air going underneath, so it is forced to move faster. When air meets the wing, it splits into two streams, top and bottom. If this were all there were too it, then how could some planes fly upside-down? That shape aids in flight, but is not the key. An airplane wing has a special shape, called an airfoil, that bulges more on top than on the bottom.
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