Solidity ratio

solidity ratio is a principle that dictates that if blade surface area to the rotated circle remain the same the fan will have equivalent air flow, for the same blade design.

E.g. a 3 bladed fan with wide blades has the same air flow as a 5 bladed fan who’s blades are thinner, assuming both fan blades have the same total surface.

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• ceiling fan
  • Adding more blades (and keeping the same solidity ratio) reduces this noise while maintaining the same air flow.