This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Airfoils pressure diagrams.svg four airfoils symmetric profile zero lift angle of attack asymmetric profile zero lift angle of attack symmetric profile positive lift angle of attack asymmetric profile positive lift angle of attack quattro profili alari profilo simmetrico ad incidenza di portanza nulla profilo asimmetrico ad