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

25 Answers

Anonymous 0 Comments

Here’s my best shot at an ELIF:

Generally, the more blades you have (and the larger they are) the slower and quieter the fan will be. It all has to do with resistance. You’ll notice that a lot of helicopters only have four really skinny blades; Super fast, and SUPER loud.

Very interesting question, kid!

Edited to say it wasn’t as hard as I thought to make it simple lol

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