Why do fans (and propellers) have different numbers of blades? What advantage is there to more or less blades?

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An actual question my five year old asked me and I couldn’t answer, please help!

In: Physics

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“When a fan has fewer blades, there is less drag on the motor and it can go faster and move more air more [efficiently](https://www.thingzcontemporary.com/many-blades-ceiling-fan/). This results in much more airflow and will create a better wind chill effect, making your space feel cooler.”

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