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Old 01-01-2017, 05:39 PM   #41
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I want the general quarters alarm sounding. Any ideas?
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Old 01-01-2017, 05:44 PM   #42
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Old 01-01-2017, 06:07 PM   #43
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one would be 100% justified by shooting ones neighbor
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Old 01-01-2017, 06:17 PM   #44
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one would be 100% justified by shooting ones neighbor
I had a similar reaction. One does wonder if realtors are required to disclose his presence to potential buyers. ...but I did find the website strangely compelling--with one hand on the volume control, of course.
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Old 01-01-2017, 08:12 PM   #45
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I really want to sound like the 6 fleet coming directly to you.. I ended with a Kahlberg double horn, a 12 liters air reservoir and a huge compressor... NOW everybody can hear me... I sound like a freighter coming to you even if I'm a mile away... use very few times but I love the sound...
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Old 01-01-2017, 08:13 PM   #46
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AFI 20150 White 12 V Marine Dual Trumpet Boat Deck Air Horn w/ Compressor | eBay I installed a simple setup like this on our boat a few years ago--Very Happy with it.

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I was looking at the AFI 10122. This one looks like the same sound level at half the price.
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Old 01-01-2017, 09:21 PM   #47
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When I did the install in my previous posting I got a lot of advice that if I put a regular, off-the-shelf electric compressor in the (gasoline) engine compartment, even a small one, my family would instantly be killed in a huge fiery explosion if the compressor wasn't marinized to eliminate sparks. Might be less of a risk with all you diesel guys though.

And my previous post about excessive volume aside, I do agree with many of the others on tone or pitch. I don't need 150 decibels to knock birds out of the sky, but a large boat with a high pitched beep-beep that sounds like a child's toy - it's just wrong. The horn on our current 40 ft LOA, 24,000 pound boat sounds like my dog's squeeky toy. Ridiculous.
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Old 01-01-2017, 11:32 PM   #48
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I installed a Kahlenberg K-380 inside the FB helm console and I've been very satisfied. I think you can find it for around $600. It's paired to a Fogmate fog horn controller.

http://www.kahlenberg.com/sites/defa...0_brochure.pdf

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Old 01-02-2017, 07:20 AM   #49
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I have a leftover old horn from a CJ-7 that plays Dixie. It would get attention.
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Old 01-02-2017, 12:35 PM   #50
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I currently have an electric dual trumpet horns. Sometimes they both work and sometimes just one. But the other issue is that I really want the "Yacht" sound of loud air horns. Nothing less than 121db. (Keeping in mind that for every 7db the sound doubles). So a horn rated at 115db is half as loud as one rated at 122db.
Anyway, anybody got a loud dual trumpet air horn that they are happy with and does not cost a boat buck?
I installed electric horns and eventually had the same problem you are describing. You can take them apart, clean the contacts and adjust them and they may work for another year or so. It's a PITA.

Horns are not only required, they are safety equipment and really need to work when you push the button.

After fooling around with these electric horns for a few years, I decided enough was enough. I bought and installed a pair of marine air horns that come with their own "on demand" compressor. I think the brand was AFI and the cost was about $230.

Since the compressor draws 20 amps, I decided to run a dedicated circuit to the compressor and use a horn relay to operate the horn from the existing switches.

It works fine and is as loud as it needs to be.


https://shop.hamiltonmarine.com/prod...brass-838.html
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Old 01-02-2017, 12:49 PM   #51
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Interesting comparison of sound strength:

Comparitive Examples of Noise Levels | Industrial Noise Control

Noise Level Chart: dB Levels of Common Sounds
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Old 01-02-2017, 01:34 PM   #52
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My brass bell might make 75 dB with a good clang.

Not very effective but it sounds better than a dog's squeaky toy and doesn't require air.

Its also easy to mount in a trawler (unlike what Gaston has)
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Old 01-02-2017, 01:55 PM   #53
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Yep... I installed these in the spring and they are fine. Loud too!
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Old 01-02-2017, 02:10 PM   #54
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Listen at around 2:45. Horn blast knocked over a beer bottle.

Problematic hobby for suburban living.
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Old 01-02-2017, 03:01 PM   #55
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Originally Posted by Pgitug View Post
I currently have an electric dual trumpet horns. Sometimes they both work and sometimes just one. But the other issue is that I really want the "Yacht" sound of loud air horns. Nothing less than 121db. (Keeping in mind that for every 7db the sound doubles). So a horn rated at 115db is half as loud as one rated at 122db.
Anyway, anybody got a loud dual trumpet air horn that they are happy with and does not cost a boat buck?
Buell horns haven't been mentioned and don't meet your cost criteria, but they are also in the big dog club. I have an AFI twin air horn setup with a small compressor that was low cost and has worked well. Loud as hell.
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Old 01-03-2017, 07:41 AM   #56
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There are actual COLREG specifications not only for the volume of boat horns but for the frequency of the tone(s) based on the length of the boat.


It's unlikely that the average Coast Guard boarding officer will test for frequency but you should know that there are regulations.
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Old 01-03-2017, 08:11 AM   #57
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There are actual COLREG specifications not only for the volume of boat horns but for the frequency of the tone(s) based on the length of the boat.
You beat me to it. The frequencies are also listed in the appendices of the US NavRules book.

One more point about horns; IMHO, chrome has no place on any kind of sea-going vessel. If you're on a fresh-water lake, fine. But salt water and chrome don't mix well. The link above to Hamilton Marine (a coastal Maine business) is for a chrome-plated horn. To their credit, I think that horn is one of the very few things they sell that's got chrome on it.
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Old 01-03-2017, 08:41 AM   #58
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You beat me to it. The frequencies are also listed in the appendices of the US NavRules book.

One more point about horns; IMHO, chrome has no place on any kind of sea-going vessel. If you're on a fresh-water lake, fine. But salt water and chrome don't mix well. The link above to Hamilton Marine (a coastal Maine business) is for a chrome-plated horn. To their credit, I think that horn is one of the very few things they sell that's got chrome on it.
I looked all over for stainless steel but could not find it. My electric horn was stainless.
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Old 01-03-2017, 10:03 AM   #59
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There are actual COLREG specifications not only for the volume of boat horns but for the frequency of the tone(s) based on the length of the boat.


It's unlikely that the average Coast Guard boarding officer will test for frequency but you should know that there are regulations.

That was one of the things that disappointed me with the LIAMM website. They don't list the frequencies so no way of knowing if a horn is appropriate for its intended use.
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Old 01-03-2017, 10:32 AM   #60
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From their PDF catalog I downloaded some years ago: the FIAMM Fultone II horn frequencies are 300 and 260, and 114DB. Quite a satisfying sound, though not quite like the really expensive brands.
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