Propeller factory using UIUC Airfoil Coordinates database

This is a universal propeller factory which makes use of the UIUC Airfoil Coordinates database which can be found at https://m-selig.ae.illinois.edu/ads/coord_database.html

To utilize an airfoil profile from that database you need to extract it with the included airfoil perl scripts. For the scripts you need:
- perl (programming / scripting language)
- libwww-perl
- perl-LWP-Protocol-https

In a Windows environment I'm using Cygwin for this which you get from http://www.cygwin.org -- other option would be to use active perl.

You invoke the script by
perl airfoil_FORMAT.pl URL

where
FORMAT is either Selig or Lednicer (for a description of the different formats see https://m-selig.ae.illinois.edu/ads.html section airfoil format)
URL is the url with the airfoil dat file

When the airfoil script has done it's job, a foil.scad file has been generated and you can start the propeller OpenSCAD file (assuming that foil.scad generated by the script above is in the same direct