Hey all. I'd like to build a windmill in my backyard. I've got plans to make it, but I'm stuck on the blades part. This is mostly for an experiment (read: can't be huge). I'm thinking blades in the 3 foot long range. I'm a mechanical engineer and do CAD and I have access to a CNC machine. That said, I haven't the slightest idea how to design a blade. I'm thinking maybe I can buy some and get started that way, but I'm also interested in making the blades if I can get help designing them. Can anyone recommend a book or anything that would guide me on blade design? Or, does anyone know who manufactures smaller blades? Thanks!