Didn't realise that windmill blades are serrated
Didn't realise that windmill blades are serrated
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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10 comments
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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.
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Trailing edge you say? So not designed to mince up birds, that's a relief.
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Oh they’ll still mince birds, just with the blunt side
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Most of the bird deaths are not actually physical strikes - it is a result of the massive change of air pressure as the blades pass at speed. Evidently painting one of the blades black - or some contrasting colour - keeps a lot of the birds well away.
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So why don't my CPU/case fans have serrated edges as well? Because they are too small?
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Some do, e.g. Noctua: https://noctua.at/en/vortex-control-notches
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10 comments