That one is actually just a regular motor siren, not supercharged. The supercharged "turbosirens" are like the one Sheppardpat posted a picture of above, look very similar but have a smaller chopper assembly, and a large duct running from a blower assembly on the bottom of the siren into the chopper intake on top.Synther wrote: ↑Tue Jan 12, 2021 3:45 amThis is the only video i've been able to find of one of the pneumatic sirens
https://www.youtube.com/watch?v=5THz1jbt6nI
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