To learn how you can make your own small model with one of the cutout approximations, click here.
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New Construction Methods for the Twisted Savonius VAWT:
With the 32 side approximation cutout model being so close to the "true" twisted savonius shape,
it is predicted that the 32 side approximation could be used to construct a full size wind turbine that was fully operational.
Four separate 32 side approximations would be scaled up to about 2-3 meters (6-10 feet) tall and traced onto a semi-flexible fabric of some sort.
These shpes would be cut out and stretched around a pre-built frame with five semi-circles as in the side view model I made in Geometry Expressions.
The closeness of the 32 side approximation would make this possible without too much bending of the shape and without making all of the folds in the model.
Of course, using an approximation model with more sides would make this method better and better, but time constraints have limited the current investigation to the 32 side model.
Regardless, this method should greatly reduce the cost of building the turbine—this new method enables construcion of the blade (but not the generator and electrical equipment) for as little as $50 for a 2-3 meter turbine—while comparable designs have been priced in the range of $15,000-$25,000 (including electrical components) at a similar size.
This significant price reduction could make seeing wind turbines on roofs much more common. Below is an animation of my Twisted Savonius model operating on top of a building.
Home Contents: The New Construction Method for Twisted Savonius VAWTs
To learn how you can make your own small model with one of the cutout approximations, click here.