Why in most of the fans and wimdmill there are 3 blades, why can't there be 4,5 or 6 blades,pls help

Responses (1)

Most windmills in my country have four blades but nearly all wind turbines have three. It's a trade off between efficiency, noise, weight, etc. A six bladed fan would be twice as heavy and would spin slower (meaning less electricity). A one or two bladed turbine would spin faster and produce more electricity but it would be noisy.

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