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I am loving what is going on here. I would love to see an upscaled version, even as large as 20 inch blades. I had a wind tower that would maintain 150 watts with 20 inch blades. It used a simple flexible blade that provided stall at overspeed conditions, and used basically a sturdy broom handle pole as a tower and pivoted on top. Coupled with the right servo motor and rectifier, you have a full size wind tower to charge deep cycles.

Also, AcrimoniousMirth won a university competition for most efficient and presentable turbine design. He offered his data in another thread, which is quite substantial. It may be worth contacting him for some data for MKIII.

Cheers!

http://www.thingiverse.com/AcrimoniousMirth