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A comment on Why we don’t understand heavier-than-air flight. Parent comment

Re:Why we don’t understand heavier-than-air flight by IshKebab on Saturday June 26, 2021 @06:08AM (#27640649)
A common and wrong explanation. The pressure differential is created by the fact that the air is being pushed into the lower side of the wing.

It's much simpler than that anyway. The wing forces the air downward, so the plane must be forced up.

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Re:Why we don’t understand heavier-than-air flight by jjk166 on Saturday June 26, 2021 @02:51PM (#27644718)
Another common and wrong explanation. The air is pushed down by induced rotation. An inclined wing is one way to do it, but is not necessary.
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Re:Why we don’t understand heavier-than-air flight by IshKebab on Saturday June 26, 2021 @03:32PM (#27645037)
I don't know what you are trying to say.
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Re:Why we don’t understand heavier-than-air flight by jjk166 on Saturday June 26, 2021 @03:48PM (#27645183)
Sorry. An inclined wing just means the wing is at an angle relative to the airflow. An induced rotation means that the wing causes the airstream to turn, so the airflow around the wing has a circular, rotating component.
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Re:Why we don’t understand heavier-than-air flight by beckingz on Saturday June 26, 2021 @12:06PM (#27643025)
Overall you are correct that the plane receives an upward force due to the air it interacts with, and that the air receives an equal amount of force downward. In level flight the vertical force components must equal zero (or the plane falls/rises).

But equally, if the plane is forced up, the air must be forced down. Cause and effect are not obvious from a force diagram.

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