Edit: Deleted false statements. See post 13 for the difference between the Log Spiral Wind Turbine, and the Archimedean Spiral Wind Turbine, (which is better performing).

Link to excellent video which describes the ASWT turbine:
https://www.youtube.com/watch?v=i4TEMZ5dyPo

I am currently exploring the 3d version of logarithmic spirals, (conical) and will probably do a script.

- Brian