Patrick. Was aware of these windspires but many thanks for input. For some reason they and Mariah power have a bad reputation. One of the gurus Paul Gipe, wrote a very sarky article about them. Looking at them my only comment would be they look a bit flimsy. Unless the central axis is pretty strong I would n't see them standing up to strong winds. If they were spinning fast in 10mph wind they ought to be reasonable generators given a good design and I don't entirely understand why Gipe was so critical unless torque is very poor, altho this would n't alter the "flimsy" argument.
I'm hoping my several MegaW Vawt in a shoe box will be so efficient that it can be totally enclosed in the shoe box except for one (or at most two ) pinhole (s) on each side to allow limited amounts of wind through. In which case Nibs will have to do so many push-ups we won't need turbines. We'll just wire him up to generate a significant portion of the worlds' energy needs. Big Al
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