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First wind machine!

(Click to enlarge photo)

I needed something to scare the birds away from the grass seed on my lawn. A wind machine seemed like the obvious answer and that was the start of my interest in windmills. It actually worked quite well and demonstrates a simple type of vertical axis machine. As it rotates a hinged flap is caught by the wind and drops down offering more resistance causing the machine to keep on rotating. Just a bit of fun really.