I built my own. 16' diameter, variable pitch, and silent as can be. The noise a windmill makes is closely related to the thickness of the trailing edge of the blades.
Have you done any write ups or posts on your build? Or do you have any suggestions of other posts about similar builds? Would love to learn more about what it takes to do this.
Absolutely. Part II has the diagrams and pretty much everything else. If you build one let me know!