HLS sirens. - TheRadanovicForum

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Date: Jan 14 10:16 2006

HLS sirens.	Permalink

This shall surprize all of you. It's a siren as big as a small tower! HLS models are German-built. HLS stands for:HochLeistungsSirene. In English this means HighPowerSiren. High power siren indeed because it produces one-hundred-thirty-one decibels of sound pressure at one-hundred feet away (thirty metres). Why? Because it relies on a perforated cylindrical chopper. With that, the ammount of sound is not limited to chopper size or port size, but rather on compressor manipulation. And compressor power in the HLS models is huge! The compressor is a two-stroke diesel motor conected to a compressor impeller, all in one major unit. The compressor motor produces horsepower in the tens area. What makes the HLS impractical is that the compressor has to be filled up so as to not starve of fuel. Here are pictures of the compressor unit: compressor motor (diesel): http://hochleistungssirene.de/pics/funktion/funktion_14.jpg, and compressor mechanism, driven by the motor: http://hochleistungssirene.de/pics/funktion/funktion_13.jpg. To deliver the air to the chopper, the compressed air stays inside a six-thousand litre air tank. When the HLS is turned on, the air automatically gets fed trough a piping system up the siren's tower. The chopper assembily consists of the somewhat-cylindrical chopper and the stator. The plain HLS model has a completely cylindrical chopper as you can tell that there are horisontal output holes:http://hochleistungssirene.de/pics/funktion/funktion_37.jpg. Later, Pinsch Bamag decided to get rid of the heavy pole structure, and started making support towers out of lattice-work steel. I think those were called the HLS 573. But then the company, Horman, went to produce the HLS, only in a far more different version, the HLS 273. Instead of that bulky siren head, they used a compact motor assembely. The HLS 273 model's chopper's geometry kind of gets me thinking. Scince the air gets pushed into the middle of the chopper and the horns are right at the bottom of the chopper flange, something tells me that the chopper is flat with a hump in the middle to channel the air to the edge of the chopper to produce sound. I think this picture explains what I mean: http://www.gibma.de/terasse.jpg. The HLS 273 models used cast aluminum horns, rather than an outer sheet steel housing. The HLS 273 model also has a smaller compressor room just to add to its increased practicality. I also forgot to say that all the HLS variants are energy independent. This means that none of them have to rely on local power. You can obviously tell with the diesel compressor unit and a chopper motor powered by a battery (a big battery), one composed of eighteen sub-units. The whole battery is twenty-four volts-worth. If there's eighteen sub units, you do the math. Sadly, none of the HLS variants are produced anymore due to their impracticality. __________________ Guess who I am talking about. Hint, hint. He loves useless petroleum... He hates the European union. He thinks he controls the world... Turns out he's a real Republican terd. He supports global warming... We should have seen that one coming. He is a dumbass... No wonder he had to pay just to get into class. All the problems in the world today... Republicans had to relate to it in some way. THANK YOU, THANK YOU!

Peter Radanovic

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Date: Jan 21 14:34 2006

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Wait a seccond.

It seems that the model I mentioned as the 573, is the F71. And it is made by Horman.

It looks like Horman didn't take such surprisingly big steps to revolutionize the HLS models, considering that both the Pinsch Bamag's HLS and the F71 had a very similar siren head. The only main differences were that there was no enclosed "tower" like on the HLS, but instead was that lattice-work steel structure I told you about. Also, the F71 kept its tank outside, with the machine room burried underground. Here is a pick of the ground level of the F71: http://tinypic.com/mb0oq0. There, now you know what I mean by the latticework tower. You can see the air tank standing outside. That hatch you see is for that underground machine room. You can see two pipes outside in that picture. The one on the left is the air intake to the air tank, and the one on the right is the exhaust from the diesel compressor motor. For those of you who want to know how the machine room looks like, here:http://tinypic.com/mb0t42. The duct on the left is the air intake duct, and the duct on the right is for the engine exhaust. There seems to be a clutch. I guess this is so because that way the compressor can stop delivering air to the chopper without having to be turned off and restarted again. So the tank is probably there just for the times when the compressor doesn't work. Maybe. It was after the F71 that Horman started refining the HLS name further, with the 273 model.

Oh, and I want to show you guys an interesting picture. Here: http://tinypic.com/mb3err. Now, look at this picture closely. You can tell that the horns are not spaced ninety degrees from eachother. That's because there is annother siren installed on it (look at the back of the siren, and than the right horn (the one that's barely visible). That's an electronic siren installed. And there seems to be cables running to that siren, note the wire running around the horns. But what gets me thinking about this picture is that the horns are not spaced normally. This is strange because the horns have to be alligned with the stator ports for sound output. But I see some horns above the others. Maybe there are auxiliary pipes directing the sound from the ports to the horns. But these are only guesses. We need some more detailed pictures.

__________________

Guess who I am talking about. Hint, hint. He loves useless petroleum... He hates the European union. He thinks he controls the world... Turns out he's a real Republican terd. He supports global warming... We should have seen that one coming. He is a dumbass... No wonder he had to pay just to get into class. All the problems in the world today... Republicans had to relate to it in some way. THANK YOU, THANK YOU!

Peter Radanovic

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Date: Jan 25 12:50 2006

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Now I am starting to have doubts about the possibility of a flat disc chopper. It doesn't look very logical to me. I'm thinking that there is a cylindrical chopper as well, only that there are sound channeling passage ways for the sound inside the housing. What I mean is that there are holes leading from the horisontally facing ports to lead to those vertically facing holes at the bottom "flange", the one that the horns are hooked up to.

__________________

Guess who I am talking about. Hint, hint. He loves useless petroleum... He hates the European union. He thinks he controls the world... Turns out he's a real Republican terd. He supports global warming... We should have seen that one coming. He is a dumbass... No wonder he had to pay just to get into class. All the problems in the world today... Republicans had to relate to it in some way. THANK YOU, THANK YOU!

Peter Radanovic

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Date: Jan 25 14:58 2006

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Also about that five-horn siren. There's no compressor hatch. Maybe it is not an HLS variant.

__________________

Guess who I am talking about. Hint, hint. He loves useless petroleum... He hates the European union. He thinks he controls the world... Turns out he's a real Republican terd. He supports global warming... We should have seen that one coming. He is a dumbass... No wonder he had to pay just to get into class. All the problems in the world today... Republicans had to relate to it in some way. THANK YOU, THANK YOU!

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Topic: HLS sirens.