>
>Short radial rods work better than long radial rods.
>Try to keep the radial rods as thin as possible while
>still maintaining the necessary rigidity. The cups
>should be as aerodynamically shaped as possible.
>An egg-shape works better than a spherical shape.

You can take the rod length to zero.
Look up "Savonius rotor"
Picture tin can cut in half vertically, displaced about 2/3 it's width.

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