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Didn't realise that windmill blades are serrated (lemmy.world)

submitted 1 year ago by [email protected] to c/[email protected]

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Took the weans a walk away up the back of The Three Towns in Ayrshire where they are installing these big bad boys.

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[–] [email protected] 44 points 1 year ago (11 children)

They disrupt the trailing edge eddies - which is what causes any noise - and so make them quieter. They are often fitted in areas where sound might be a particular issue.

[–] [email protected] 2 points 1 year ago (3 children)

So why don't my CPU/case fans have serrated edges as well? Because they are too small?

[–] [email protected] 3 points 1 year ago

Some do, e.g. Noctua: https://noctua.at/en/vortex-control-notches

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