The one-curve airfoil is easier to manipulate when building a wing. The NACA airfoils are airfoil shapes for aircraft wings developed by the National Advisory Committee for Aeronautics (NACA). Re: Which naca profiles for sailingboats I wouldn't really use a 420 for comparison purposes. It can print any NACA 4 or 5-digit airfoil to any scale with excellent precision on an ordinary laser, ink jet, or dot matrix printer. This is a 3D airfoil using the Clarkz airfoil from above. A wind tunnel study of a 2D airfoil (NACA 4415), typical of an airfoil used by wind turbine rotors, is compared with predictions made by our Panel Flow add-on. An investigation was conducted in the NACA full-scale wind tunnel to determine the aerodynamic characteristics of the NACA 0009, 0012, and 0018 airfoils, with the ultimate purpose of providing data to be used as a basis for comparison with other wind-tunnel data, mainly in the study of scale and turbulence effects. Three NACA airfoils: one figure each for NACA 1412, 2412, and 4412.
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