Niels - "I'm always immoderately annoyed when windmills don't turn simultaneously."
Wow! I am not alone in that then?? I think they should have them turn so the blades turn at same rate and in the same angle as they turn so when one bald is vertical there is the same blade vertical on another one. Also why have one not turning when all the others turn? Why?!!! It makes no sense. Unless it is not viable to let them turn, i.e. not economic. If that's the case then why build it??
Sorry, don't mention windmills with me about. Brings out a degree of irrationality!