Why do windmills typically have 4 blades, yet all modern wind turbines have 3?

Question

Why do windmills typically have 4 blades, yet all modern wind turbines have 3?

In: 9124

Answer 1

I think because back in time, crossing two very long logs to create four blades was much easier than trying to secure three blades.

Answer 2

I think because back in time, crossing two very long logs to create four blades was much easier than trying to secure three blades.