Not too happy with my fans.....

AAndrews said
Hoping to learn something here..

I always thought that electric fans always run at the same speed and the blades do not change pitch. With mechanical belt driven fans , the fan blade pitch changes with speed and if equipped with the viscous clutch it actually cuts out when the fan is no longer effective.

Looking forward to any comments.
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I know it's quite possible for an electric fan to have different speeds as the one in my living room facing me right now has three different speeds with only one plug-in. There's no paretic drag on the motor at all ever with an electric motor driven fan. And they too should just turn on when you need them and turn off when you don't.