Many German sirens have both the motor and the intake on the bottom, which is how they are able to have a dome on top without choking out the siren.

From this angle you can see what looks like a motor on the bottom.

I figured it was a lightning detector mostly because it is located right by a large park area, Detectors are often beside parks or sports fields. That being said, after looking at it more closely, it definitely looks more like a siren. From certain angles the motor is visible (or at least what looks...

The sirens back then were startling and spread a message of disaster. These sirens are designed to of course sound musical, and music and war are two thing that don't mix. I always assumed that in the event of an actual emergency, the music sirens would be used with the ports on all the stators ope...

I also think it is a pneumatic siren. I see barely any room for a chopper. Lightning detector. Has the dome, the light, the loudspeakers, can't imagine it's anything else. No way it's a pneumatic siren, no compressor setup at the bottom or air lines running into building, not to mention it looks no...

Found this short video of a Japanese music siren today, has a good close up of the rotors spinning up and the stators moving to cover and uncover the ports. https://www.youtube.com/watch?v=dq32VQZwRx0

Sirens were sent to Taiwan according to one of ACA's promotional tapes, and Cyclones have been spotted in Taiwan, but it's a bit of a hot potato as there are something like 3 types that have been spotted if I recall correctly. They are: Normal Cyclone Cyclone that has the motor on the bottom and th...

I'd be interested in seeing the patterns for the 40hp, wouldn't mind playing around with trying to build a scale model of one with a bench grinder motor this winter (out of aluminum).

Hor Siro Drone 10 port is the conclusion I came to. Windup is linear (induction motor) so not a model 2. Wind up, wind down, and tone have same characteristics as a Siro Drone, and considering that it is an old American recording, from when there were more of them around, I can't imagine it would be...

The loudest design would probably be a variation on the pneumatic siren, since a large amount of energy can be turned into sound very efficiently and quickly. The German pneumatic sirens make use of either a disk (F71, etc.) or drum (HLS273) with very tight tolerances and compressed air stored in a ...

When researching Japanese sirens, these 3 recordings always seem to come up (especially the first two). I guess these are Japan's equivalent to the famous HOR Siro Drone recording that is always used in movies. All 3 are different types of Japanese sirens I would assume, though the 2nd also sounds e...