# Can you tell from the given red marked line sentence which type of wind speed is being referred?

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I am reading a SUBTOPIC----performance of similar geometric wind machines

MAIN TOPIC ----General theory of wind machines

BOOK NAME-----power generation

BRANCH ------- MECHANICAL

I have given a screenshot and I am confused with a the red line marked "a given wind speed". which type of wind speed?

Upstream wind speed , downstream wind speed , wind speed through rotor , tangential speed of rotor

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