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Cardboard Savonius Wind Turbine

Step 2Make the vertical paddles

Make the vertical paddles
Cut 4 strips of cardboard 4" x 10". These will be the vertical
paddles that catch the wind. Cut two rectangular notches in each
paddle. Each notch should be 3 inches long and just wide enough that
the disk will fit in snugly. These notches will be located 1 inch from either side of the ends of paddles.
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