Ing. Marcelo Fornaso wrote:
> Actually, planes with wings with aerodynamic profiles are pulled up
> by vacuum (in a way to speak), more than pushing air down.

Vacuum versus pressure may describe how the forces are transferred to the
wing surfaces, but ultimately a plane has to push down air to keep itself
up.  You don't have to know anything about how wings work to show this has
to be true.


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