Luftschutzsirene.de

Nice collection! The blue one looks interesting. Can you post some close-ups ?

Hi

The blue one is a siren of my own construction, which I built three years ago!

The rotor and motor is compact. This unit is a galvanized steel blower used in industrial fans etc.

The stator and body made by plastic.

awseome work!
but how does it sound?!

well, as you understand the rotor is not special for sirens and its vanes are not square and they don't "fit" the holes.

For that reason the sound is not as loud as if the rotor was special. (considering the size)

Though, in full speed 2630 rpm I measured ~100 - 105 dB and frequency 482 Hz

I' ll try to record the sound and post it here

I recorded my own construction siren.
The file isn't very clear, but here it is:
http://media.putfile.com/electra-14

Nice work! It sounds very nice!