One thing I've heard much about is the killing of birds - in fact, it's even noted in the article. We've got someone quoted there saying there's no real danger because the thing only does 12rpm. Well, if I'm doing my math right, that still means the tips of the blades are going at damn near 177mph.

Now - am I saying to not build these? Hell, no. Anything that can prove to be feasible, generate lots of power, and show a profit is fine by me. Just be a bit careful with the placement and be honest with the facts.