How to get the value of cp in vawt Savonius Turbine without knowing the value of area?

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Ricardo Fernandez-Aldama

I don't quite understand what you need. Could you give us more details on what you are trying to accomplish here?

A fair approximation for the Cp is to look up its values for other Savonius turbines. Cp is not a function of area but of aerodynamic design (and operating point).

Biswajit Nath

Cp =Pout/Pin

where Pin is a function of area. So, area is required to calculate Cp