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Parametric NACA4 library

Parametric NACA4 library

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This library is crucial for my current project. I made some adjustments to David's code by buzz: 1) Removed MCAD dependency for portability 2) Moved calculations into the airfoil module 3) Enabled dynamic NACA profile changing To use, download and place in OpenSCAD library folder. Include with "use" directive and call the module: airfoil(); (default 8412), or airfoil(8,2,15) for custom NACA-8215 profile. Enjoy!

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