Didn't see this post.
My parents had a small windmill back in the late 70's. Their idea was to get ready for the waning years by having their utility bills covered. Started out with woodstoves for heat, passive solar for hot water, and windmill for electric.
Started out with a "downwind" 36 volt 4 KW battery system that didn't work as expected. Never produced the power and we realized too much turbulence from having the wind blow through the tower before getting to the blades. We found that in our area you usually get 10% of any wind turbine's rated output per month.
So they kept the heavy well built tower and replaced the turbine with a Jacobs KW unit. http://www.jacobswind.net/
read the history on the website. Jacobs had originally built these units for remote farms until the rural electrification act brought power to the farms. He retired. But then due to the energy crisis on the 70's, he restarted back up.
We were so excited to get one due to the reputation of his older units. We signed up as a dealer and finally were able to get the #18 machine off the restarted company's production line. I went to MN to school to service them. However they redesigned them after the first 40 units. But by then Control Data Corp was already making changes to them. Probably to produce greater profit for their investment. When it ran, it was great. We would spin the meter backwards. It was tied to the grid. Grid power was required to make the field for the generator.
However there were more than enough problems. We had the blades hit the tower at least 3 times. 11 1/2' wooden blades being shattered and pieces flying through the air. Not good. we owned it for close to 2 years. Every problem was covered under warranty. I spent many hours up on top of it. Finally 1 day it was hit by lightning and the homeowner's insurance covered the repairs. While getting rewired, we found a buyer for it as is, and it was gone. Thought about upgrading to a newer model but the servicing was getting to be too much. There were only 2 of us able to climb and work that high.
What we did find was that even though it was 100' high and we sat up on top of a hill, the air was turbulent due to coming up the hill. But the machine was able to handle it. It was self feathering and had a foldable tail for winds over 40 mph to prevent runaway operation. I believe they would work best with a long reach of undisturbed air. I really would not minding having 1 again.
Any more question feel free to ask.