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Hi-I like to know what will be aerodynamic lift in a very curved airfoil at the highest possible angle of attack at low air speed-about 20 m'/sec?
→ wind tunnel testing.
If it is a NACA profile you can find using GOOGLE graphs for the aerodynamic coefficients as function of angle.
http://www.grc.nasa.gov/WWW/K-12/airplane/bga.html
http://www.profoil.org/
http://www.tdmsoftware.com/afd/