The next question we had was: What about blades? The basic "propeller" as some call it, is generally a three blade operation. On our commercial turbine a set of blades sets us back nearly $100. Not so here, the blades are built out of a chunk of PVC drain pipe. Gimme a break! This obviously isn't rocket science, but hey, it works.
Check out the website of the good folks at Vela Creations. They offer a FREE detailed manual on how to build your own Chispito Wind Generator with pretty much common tools and cheap parts.