![]() There is a massive low pressure above an airfoil, due to the increased airflow, 'sucking it up.' ![]() Bernoulli is used to describe what happens above the wing. This downwash is often used to show Newtan's 3rd law. There is airflow being turned down off the trailing edge of all airfoils, this is known as Downwash. There is not a "Law of Lift", we have some good ideas, but no one actually knows how lift works. Excess engine power allows an aircraft to climb or descended. It displaces the air to remain 'floating'. If the airplane weighs 100 pounds, it needs to generate 100 pounds of lift. The airplane MAY develop more lift or more weight in a short time span, but they will balance each other out. Lift is an upwards force opposed by weight, the downward force. Lift and weight are forever seeking each other in balance. Of the airflow, and it is this downward deflection that ultimately gives the body lift. Lift can be explained in terms of pressure differences ( ) or from a downward deflection of the airflow ( ) ![]() One big problem with this explanation is that an airfoil is not a Venturi nozzle. This explanation incorrectly invokes Bernoulli's principle to explain the pressure difference between the windward and leeward surfaces as resulting from a constricted flow along the upper surface of the wing. One problem with this explanation is that it ignores the action by the leeward surface of the wing, and it is this surface that does most of the airflow deflection in a well-designed wing. This explanation incorrectly invokes Newton's third law to explain lift as a result of action by the windward surface of the wing. One problem with explanation is that it fails to explain how a plane can fly upside down. This explanation incorrectly invokes Bernoulli's principle to explain the pressure difference between the windward and leeward surfaces as a result of different transit times. Here are three models of force that NASA deems to be incorrect: A wing whose lower surface provides the majority of the lift does exactly the opposite. A good lifting body maximizes lift and minimizes drag. An object whose lower surface accounts for the majority of the lift makes for an incredibly lousy lifting body. This is exactly the piece of plywood I talked about in post #11. The air is compressed under he wing, the molecules of air squashing together pushes the other surrounding molecules and they bunch up resisting the downwards movement of the plane. Imagine in a theoretical plane design that a wing is mounted to the plane that moves downwards from the plane. Is there another plausible one? Edited Jby alan2here The molecules below the wing are compressed (squashed together) and as the molecules don't move instantly (momentum) you get a bunching below the wing called lower pressure and higher pressure due to the same mechanism above the wing and the plane is pulled up, fundamentally by pushing air and having the air push the plane. It's wing is at a constant angle and moves forward, the molecules at the front of the wing can easily slide above and below the wing. An insect would then tilt it's wing and bring it back up with less resistance for another go.Ī real plane however is simpler. The wing gets to it's fully downward point and the molecules have time to move around and spread out evenly again at which point the plane will start to fall.
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