system
Given the following post, respond as if you're commenting on Reddit:
human
Why do wind turbines only have 3 blades?

It seems to me that if they had 4 or maybe more, then they could harness more energy from the wind and thus generate more electricity. Clearly not though, so I wonder why?
gpt
As a blade moves, it creates a wake, like a boats wake, that disturbs the air around it. That wake can interfere with the efficiency of the next blade as it passes. So, it's a tradeoff situation for efficiency that factors in  number of blades, blade speed, wind speed, and RPM to maximize the efficiency of energy conversion. This is also why how close the towers are to each other and how they are oriented overall on the landscape. Watch a sailing race and see how they try to steal each other's wind.