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    $\begingroup$ Not really expressed in answers: Flying is converting viscosity properties into inertia effects. To create lift a wing moves air downwards by deflecting the airflow using viscosity effects. Airfoils are profiles optimized for this result. Positive angle of attack and/or asymmetry are not required (though they help). Reynolds Number is key in designing airfoils (wings and propellers) and hydrofoils, and staying in the laminar flow domain of the boundary layer where helpful viscosity is prominent. $\endgroup$ Commented Jul 25, 2019 at 10:16
  • $\begingroup$ I cannot write and answer here but I agree that the cause of lift is air deflected down. See physics.stackexchange.com/q/51503 $\endgroup$ Commented Sep 14, 2020 at 21:50