A very good place to start looking is on the website of Hugh Piggott. He has built numerous wind turbines, and he is an excellent teacher. On his website
www.scoraigwind.com you can find a lot of information about the blades. Look particularly for "blade carving" and "blade aerodynamics" because he has written a page or two about the very question you ask.
Also - there is a chance, small chance but not a zero chance, that some of his material has been translated into greek. I know it has been translated into french and italian, so maybe some ΓpΣΣk translation exists.