Wind turbine experiment

I have designed this for a school project of my son (Fip NWA, Fachinterne Prüfung NaturWissenschaftlichesArbeiten). For this to work in OpenSCAD, you need the NACA Airfoils library from Parkinbot:https://www.thingiverse.com/thing:898554 Many thanks for this library.You can print it for 2 to 6 rotor blades, and configure also different angles. The rotor blades are mounted with a bayonet joint, and all parts are designed to print without support.In our case we can say, that the transmission with t