What kind of siren is this

[Whelen Rules]

Sounds an awful lot like a t-128 http://www.youtube.com/watch?v=pf9karZr ... ed&search=

[Daniel]

That is an E-57 in Germany, in a less-common pole mount configuration. The German language title was a dead giveaway.

[tbolt1003man]

VERY Similar to the HLS

[Nelso90]

Not at all similar to the HLS. The HLS is a compressor driven siren remember?

[loudmouth]

acctuly no not at all very similar to the HLS.
HLS uses compressed air around 1000 psi thats forced into the chopper and stator that dosnt have the normal ports they are acctuly are round insted of the retangle shape. I did see pics of it some were.

[SirenMadness]

Not to mention that there is not vanes in the rotor. It only has four ports, for less usage of air.
Another thing is that the E-57 has so many other sirens based on its main design, especially the ESA 20-01, which is basically the same thing, actually.

[q2bman]

1000 PSI ! Did i read that right!?

Man, is their web site i could read up on these things?

[SirenMadness]

Here is a good site on the HLS series.

[Daniel]

To make an E-57, get a Model 5 with nine ports (there aren't any, but pretend that they have nine ports), remove the stator and rotor, flip them over and reinstall with the motor partially inside the rotor, and finally put a large salad bowl on top. An HLS is essentially a four-horned, non-rotating Thunderbolt with a large air reservoir below. Both the E-57 and the HLS sound at approximately 440 Hz., since I understand that German law specifies that sirens must sound within this particular frequency range. The USA has no such law, so we run the gamut from the sultry STL-10 to the screeching Sterling M-10, 1? octaves higher.

[Jim_Ferer]

I'd love to know more about how the HLS works. I've seen psi figures up to 7,500 psi quoted for the operating pressure of this siren, which just seems like it must be completely off, to 1,000 psi here, which is still awfully high. On an HLS website I saw a gauge reading 6 bar, which is about 87 psi. (Of course, that doesn't guarantee that's the operating pressure, but what else is it?