N/AAA
Posted: Wed Mar 02, 2016 6:16 am
N/A Old Info.
That's correct - the SD-10 and Models 5T and 7T were not very loud as they only use 3 arms to draw in air. I live near an SD-10 and while it works nicely in the valleys, it's not loud enough to cover much of the city. It is located on top of a hill so most of its sound is projected downward. They were always meant as "filler" sirens: filling in for parts of a city where other sirens might not be heard. My city did just this, installing a mass of SD-10s to fill in new areas that were developed since they bought their original siren (a Mobil Directo). All worked well until one SD-10 decided to blow its top, then the city went around replacing everything with new 2001-130s. The rest is history.SoundMaster 391 wrote:Wow this is some very amazing and interesting information. So the more arms there are, the more air it will pull in? Also was the SD-10 not that loud because it only had 3 arms in the chopper?
Ah ok. Hawaii has some SD-10 sirens. Most of them were located either at places where they needed some coverage or in valleys.SuperBanshee wrote:That's correct - the SD-10 and Models 5T and 7T were not very loud as they only use 3 arms to draw in air. I live near an SD-10 and while it works nicely in the valleys, it's not loud enough to cover much of the city. It is located on top of a hill so most of its sound is projected downward. They were always meant as "filler" sirens: filling in for parts of a city where otherSoundMaster 391 wrote:Wow this is some very amazing and interesting information. So the more arms there are, the more air it will pull in? Also was the SD-10 not that loud because it only had 3 arms in the chopper?
sirens might not be heard. My city did just this, installing a mass of SD-10s to fill in new areas that were developed since they bought their original siren (a Mobil Directo). All worked well until one SD-10 decided to blow its top, then the city went around replacing everything with new 2001-130s. The rest is history.
This may be a little off topic but I'm just wondering since the system you described sounds like Beaver Dam, WI, which one SD-10 still exists. If you're talking about Beaver Dam how many 2001-130's are in Beaver Dam? And the three current SD-10's in Madison are on hills too (maybe not the one on Beld but the other two in Madison are) so they produce the sound further than expected.SuperBanshee wrote:That's correct - the SD-10 and Models 5T and 7T were not very loud as they only use 3 arms to draw in air. I live near an SD-10 and while it works nicely in the valleys, it's not loud enough to cover much of the city. It is located on top of a hill so most of its sound is projected downward. They were always meant as "filler" sirens: filling in for parts of a city where other sirens might not be heard. My city did just this, installing a mass of SD-10s to fill in new areas that were developed since they bought their original siren (a Mobil Directo). All worked well until one SD-10 decided to blow its top, then the city went around replacing everything with new 2001-130s. The rest is history.SoundMaster 391 wrote:Wow this is some very amazing and interesting information. So the more arms there are, the more air it will pull in? Also was the SD-10 not that loud because it only had 3 arms in the chopper?