propellers and repellers - OpenSCAD library fully parametrized using Naca four digit airfoil data

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Human: Propellers convert rotation into thrust while Repellers convert thrust of a fluid stream into rotation, enabling energy harvest. The difference lies in reversed pitch mounted on Repeller blades to the shaft.\nI sought to print my repeller designs for testing purposes but failed to find usable information within this forum - specifically, code.\nBuilding upon my previous libraries required merely a couple lines in OpenSCAD to yield desired airfoil data incorporating camber and twist.\nThe resulting code is relatively straightforward with only a few lines, so I decided to expose the most crucial parameters while utilizing consequent defaulting for expedited results.\nOne can always introduce additional design parameters to cater to more specific needs. That decision is left up to you.\nWhat You'll Get:\nCode that utilizes consistent defaulting and is easy to understand \nThe library's capabilities, complete with numerous parameters for adjusting propeller and repeller designs \nThe full range of examples demonstrating the library's flexibility \nHelp text showcasing module signatures within the command window \nRequired Tools:\nOpenScad 2015 - one sublibrary employs this version \nMy NACA4 library, containing airfoil information that is straightforward to utilize.