I can only guess that wind turbines used to generate electricity have only 3 blades because it is the most efficient design.
If this is the most efficient design, then why do house fans have more blades. Why are they not made with 3 blades?
(may be broke/outdated!)
I can only guess that wind turbines used to generate electricity have only 3 blades because it is the most efficient design.
If this is the most efficient design, then why do house fans have more blades. Why are they not made with 3 blades?
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2 Responses
It’s probably due to the size of the blades. The they make them too heavy, it would take too much energy to turn, and they need to make them long, so they can get the most leverage.
Just a guess, but seems like a plausible reason to me.
“I can only guess that wind turbines used to generate electricity have only 3 blades because it is the most efficient design.”
They are a good technical compromise between cost and return. If you make five blades and get 10% more efficiency, you have wasted a lot of money on absolutely nothing. Engineering is about cost optimization, not efficiency optimization.
“If this is the most efficient design, then why do house fans have more blades.”
More blades make less noise. A house fan has to be quiet, not efficient. That is a different optimization goal.