It is evident that the Savonius shape (green) needs to be larger than the HAWT shape (blue) to be able to produce similar amounts of power. The very low blade tip speed of the Savonius however results in some very positive attributes, namely:1) Virtually silent operation - (suitable for use in residential areas)
2) Structural advantages - (low centrifugal loads)
3) Safety - (less chance of catastrophic failure and related losses)
4) Visible to birdlife whilst rotating
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