Wind Power
The above video is ingenious, but I think I would hinge the shovels at the end where they join so they would feather into the oncoming wind on the return side, similar to the one shown below.
Here is a little different concept with the vanes adjusting to each other (below). And here is one running.
And a view from the top.
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Below is an actual one in Croatia
Here is a little different way of doing the same thing. |