Dang, I felt a visceral sense of dread as it spun up. The terror of air raid sirens is such a deeply engrained thing even generations after the bombs fell.
more like, these "apocalypse sirens" are specifically engineered to reach certain frequencies that trigger 'fight/flight' response in human. they hit the natural weakness of our primitive brain.
This siren is awesome! i 3d printed a chopper and stator from this to make my own signle-toned siren and it works perfectly!! thanks for linking the files!
Sure does! But also has its distinct dual independently running choppers compared to the carter castle sirens which i believe both choppers are on one shaft
I think the difference in the acceleration of the rotors is absolutely insignificant. In addition, the rotational speed of the motors is quite accurately controlled by two equally calibrated ESCs.
@@lautalanmoto It doesn't maintain a harmonic sound if they're out of sync. For the Federal Signal 2T22, it maintains the minor 3rd interval since both choppers are in sync (driven from the same motor) So are the famous British WW2 air raid sirens, those maintain their bone chilling minor 3rd harmonic.
Sounds. Amazing its no carter siren castle siren but it has a unique. Tone to it similar to a carter castle siren. Very cool that each chopper works individually with its own motor. How loud is it? Dbs?
Would it be legal to build one of these? My area uses an old air raid sirens for tornado warnings. I don't want to get charged with causing a public disturbance or something.
It's not a bomb. Yeah, it's legal to build one, but depending on where you are using it, it can't possibly be legal to use without breaking laws relating to disturbing the peace and some more specific laws regarding the use of loud devices in public areas and subdivisions.
I know I'm 10 months late, but take a look at the WWII air raid sirens from the UK. They looked more or less just like this one (fully open) and just mounted on street lighting etc.
