Quote:
Originally Posted by Piotrsko
Wat I understand, relevant or not, is that the airflow on the bottom of an airfoil is typically always attached and laminar on a semi flat bottom section. Not so on the curved surface, and due to the lack of leading edge radius is probably turbulent as all get out probably to the point of stagnation.
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Yes indeed - you’d expect an aerofoil to have much lower drag than a simple curved plate. But I am very surprised it appears to be so critical in this application. (Most turning vanes aren’t aerofoils.)