In the #14 post Ed gives the size of the wind tunnel, but not the size of his rotor,so the exact blockage can not be determined. From the previous images, it's clear that his rotor is quite large, probably at least 50% to 70% of the tunnel swept area. He notes that a blockage correction factor was applied. This all take place in 2005, before the dangers of applying blockage correction factors to high solidity turbines is investigated in Ian Ross's 20010 report. This means that the data collected is effectively meaningless I think? I'm not saying the turbine is good, or bad, just that we don't know anything conclusively from this report and as far as I've been able to find, no report that includes the blockage calculation was ever produced. I'd be happy if someone could point one out. Also for the Ugrinsky turbine, another interesting design that people make big claims for, and for which I'd love to see some research on.