Cardboard Savonius Wind Turbine

Step 4 Draw angle lines on the disks

Now for a little geometry. Take a look at the first image. Notice that there is an Angle A and sides a, b, and c. Side c is the line that we want the paddle to line up with. Where we draw it depends on angle a. To do a little geometry on this let's cheat and use a web-based right triangle calculator.

Make use of the following url: http://www.csgnetwork.com/righttricalc.html My side b is 5 inches (the radius of the circle) and I chose to make side a 2.25 inches. Accoding to the calculator, this makes angle A 24 degrees. You can play with this calculator by either entering side a or angle A as you experiment with different configurations.

Going with my 24 degrees configuration, make a mark along side a 2.25 inches from the center of the circle and then draw side c. Now do that with the other three radius lines.

After that is done, do the same thing with the other disk.

Notice that there are short cuts in the disk at angle A on each radius line. The pupose of these cuts is dock the paddle to the disks. The cuts should be about a half inch and should follow the path of line c.

Comments

[IETMN]

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