Parametric NACA4 foil

thingiverse

Here's a cleaner, more parametric remix of the NACA 4 airfoil, where the number of points is now also a parameter that requires list comprehension for the polygon, thereby improving readability. The trailing edge can optionally be closed. To avoid confusion, the module has been renamed to naca4; the default values for the new parameters result in the same airfoil as the original module. The duct fan OpenSCAD file showcases what can be achieved with a parametric NACA 4 foil generator. It features hollow arm, hollow duct and reinforcing ribs inside them, all obtained through NACA 4 and some offset / scale.