Compilation of warning sirens - GIF

Compilation of warning sirens.

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Previously:

LionKing Defender civil defense siren - GIF

anyone ever built one of these sirens? specifically I want to know how close fitting the rotor and vane need to be for it to work well? the one I want to make is a version of the handcranked air raid type siren (about 75mm (3") rotor diameter.

thanks,
Des

Quote:

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Originally Posted by desbromilow

anyone ever built one of these sirens? specifically I want to know how close fitting the rotor and vane need to be for it to work well? the one I want to make is a version of the handcranked air raid type siren (about 75mm (3") rotor diameter.

thanks,
Des

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I did a search on Screwtube for "diy mechanical siren" and there are some on there.

Quote:

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Originally Posted by desbromilow

anyone ever built one of these sirens? specifically I want to know how close fitting the rotor and vane need to be for it to work well? the one I want to make is a version of the handcranked air raid type siren (about 75mm (3") rotor diameter.

thanks,
Des

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Mattias Wandel has several videos on sirens. IIRC it was a side quest while working out geometry for a Thien baffle type dust separator for his wood shop. I don't have the link to the videos but you can get to them via his website https://woodgears.ca. He gets a bit into the weeds of math and theory, but in layman's language.

Neil

I think I remember on this forum was a guy who built a very large siren out of wood. He was probably the pariah of his neighborhood.