"Garland Gray II" wrote in
news:PC7kf.26965$ih5.11538@dukeread11:

I was thinking the drums were perfect cylinders. Maybe not, but I
thought the principle was that wind past the rotating surface created
a pressure differntial. Makes sense, but I can't think there would be
much resulting force.
I might drive up there some dreary day to find what happened to her.



No, the "vanes" are, looking at them from the end, cup shaped between the
outer and center, I think. It would make sense if the shape of each of
them were a vertical wing on Bernoulli's Principal with lift as it goes
by the proper wind angle for lift (rotation power).