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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Signal Horns - Boring Tech Questions
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Thread: Signal Horns - Boring Tech Questions Reply to Thread
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Topic Review (Newest First)
06-25-2011 09:17 AM
capecodda Always wanted one of these but could never talk myself into the complexity of a compressor, etc. But, take a listen:

Marine*-*Buell*Air*Horns
06-24-2011 10:07 PM
jrd22 Larry and Sue- I didn't mean not to get the mizzen mounted horns, just that probably any of them will be adequate for a 41' :-))
06-24-2011 10:05 PM
CalebD
Quote:
Originally Posted by Boasun View Post
Said regulation is in the back of the Rules of the Road book, Appendix 1, I believe. It does give the different tones for each size vessel... With the ultra large vessels having the lowest tones.
Kill joy - even though I knew there were regulations about this.
The big boys get the horns with muchos cojones. The rest of us not so much.
Cruise ships and bigger boats have great horn sounds.
This gives me an idea for making a song with sampled ships horn sounds.
06-24-2011 08:26 PM
Boasun
Quote:
Originally Posted by CalebD View Post
Have you ever heard or been given a blast by a large commercial vessel? That is what you want for your 41 footer!
I got the 5 horn blast salute from a 100'+ motor yacht down in Annapolis harbor a few weeks ago. The commercial vessels give better horn.

Then again there is probably a regulation stating that you cannot make your horn sound like a 1,000 ton freighter if it is a 41' sailboat. There are regulations for everything after all.
Said regulation is in the back of the Rules of the Road book, Appendix 1, I believe. It does give the different tones for each size vessel... With the ultra large vessels having the lowest tones.
06-24-2011 06:57 PM
CalebD Have you ever heard or been given a blast by a large commercial vessel? That is what you want for your 41 footer!
I got the 5 horn blast salute from a 100'+ motor yacht down in Annapolis harbor a few weeks ago. The commercial vessels give better horn.

Then again there is probably a regulation stating that you cannot make your horn sound like a 1,000 ton freighter if it is a 41' sailboat. There are regulations for everything after all.
06-24-2011 06:33 PM
MikeWhy Larry, I'm not an acoustical engineer, but the definition should still bore you to tears. The column heading of "dB referred to 2◊10−5N/m2" means standard sound pressure level referenced to human threshold of hearing (20 micro-pascals). The "1/3-octave band" refers to specified 450-800 hertz (first harmonic of the fundamental tone).

Taken all together, it means what I wrote earlier: a properly calibrated meter placed one meter in front of the horn of your compliant whistle should read 115 dB or higher. It doesn't tell you anything more, or whether dual tone carries farther or better. Personally, I think dual tone horns sound fuller and more melodic.

So, bottom line, the horn should be slightly higher in pitch than middle C (not lower, as I wrote earlier), and pretty dang loud, but doesn't need to be painfully loud.
06-24-2011 05:58 PM
LarryandSusanMacDonald WOW! Thanks for all the input. One can always count on Sailnet!

badsanta - I've seen that device - don't like the price.

hellosailor - Thank you so much for an understandable explanation!

jrd22 - You're right, I'm probably overthinking - but I've had a couple of instances where I needed the horn right away - and somebody had carelessly, carefully put it away. A button at the helm would be nice - and the horns 30 feet above wouldn't bust the eardrums and can probably be heard farther. Maybe.

MikeWhy - Sometimes I just like getting into the gobbledygook - I hate being a layman.

Boasun - I'll check out the autoparts store - good idea. I'm always for saving a few bux.

Omatako - At least here in the US, ya gotta have one - even if it's just a handheld.
06-24-2011 05:36 PM
Omatako I don't live in the US so extensive research of the regs doesn't interest me but I did read the one on Larry's link and although it waxes lyrical about what the "whistle" should sound like, I never saw anywhere that said you have to have one.

So if having one isn't a requirement, how can the sound of the one you have be a requirement? Another beauraucratic screw-up, IMHO.
06-24-2011 01:50 PM
Boasun The size vessel (41 ft) you have, A set of 12v air horns from an Auto parts store will fit your vessel just find. They come with their own air compressor, 12v and easy to install.
06-24-2011 01:05 PM
MikeWhy In layman's terms, horns for vessels 40 ft to 65 ft LOA should produce 115 dB near or just below middle C. The other gobbledy-goop is the definition of how the sound pressure level is to be measured and referenced.
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