Model Boat Propeller Designer - for 3D printing

This little OpenScad script which I wrote - allows you to design propellers for boats.. from 3 blades to more than 20.
It does all the calculations and creates a view on screen that can be 3D- printed.

You can alter the length of the blades, the number of blades, the diameter of the propshaft and the length of the propshaft by setting the variables at the top of the program.