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Old 01-31-2014, 04:29 PM   #21
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Is it the engine room 24V blower? Where does the fan exhaust?
Yes.

There are louvered engine-room vents, gunwale high, on either side of the pilot house. One is for air intake, the other for exhaust.

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Old 01-31-2014, 05:46 PM   #22
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I'd recommend spraying a little WD-40 into the mouth of the trumpet annually....keeps the note sounding as new and displaces some of the salt build-up.

I wouldn't put an auto or home depot fan into the engine room unless sure it is ignition-protected, as quality marine fans should be. (Vetus make the highest-volume fans for 12 & 24v systems I've been able to find, short of going to the people who +ve-pressure their engine rooms. Model is VENT178; capacity 424CFM; 5.6A draw at 12v (2.8A @ 24v))
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Old 01-31-2014, 06:01 PM   #23
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The type of horn set the OP is talking about has no reservoir or solenoid. It uses a small compressor, about the size of a soup can, that turns on each time you press the button.
Like the ones in the auto parts stores? If that's the case, the compressor should be as near to the horn as practical, not more than a few feet.
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Old 01-31-2014, 10:20 PM   #24
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I'd recommend spraying a little WD-40 into the mouth of the trumpet annually....keeps the note sounding as new and displaces some of the salt build-up.

I wouldn't put an auto or home depot fan into the engine room unless sure it is ignition-protected, as quality marine fans should be. (Vetus make the highest-volume fans for 12 & 24v systems I've been able to find, short of going to the people who +ve-pressure their engine rooms. Model is VENT178; capacity 424CFM; 5.6A draw at 12v (2.8A @ 24v))

No real need to be ignition protected on the fan in a diesel boat

Also some of the "bilge blowers" are not designed to be run 24/7.. they have a short life span.
I had a 12" radiator fan setup on Volunteer and it worked really well to cool down the engine room which was about 1000 cubic feet.
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Old 02-01-2014, 07:08 AM   #25
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I had a 12" radiator fan setup on Volunteer and it worked really well to cool down the engine room which was about 1000 cubic feet.

Folks at the higher latitudes have been known to use a small circ pump and a box heater for almost silent cabin warming after shutdown.
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Old 02-01-2014, 10:02 AM   #26
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Our boat came with non-Kahelberg air horns. They worked well for about 3-4 years. Then they were crappy for another year. Then I ripped them out and put in an electronic horn. That's now worked perfectly for 6-7 years. The twin dual-trumpet cost under $200 and the installation was trivial.

It's a personal thing, I guess, but I never really understood the need to have a horn that knocks everyone's socks off. I think they should be very practical things - and because we live in Maine, we probably use our horns more than other boats (because of fog). I really prefer an effective horn and not one that's trying to make a statement.
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Old 02-01-2014, 10:37 AM   #27
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Our boat came with non-Kahelberg air horns. They worked well for about 3-4 years. Then they were crappy for another year. Then I ripped them out and put in an electronic horn. That's now worked perfectly for 6-7 years. The twin dual-trumpet cost under $200 and the installation was trivial.

It's a personal thing, I guess, but I never really understood the need to have a horn that knocks everyone's socks off. I think they should be very practical things - and because we live in Maine, we probably use our horns more than other boats (because of fog). I really prefer an effective horn and not one that's trying to make a statement.
Stock boat horns are pretty ineffective.

With people running their boats near WOT (obviously not trawlers or sailboats) with the stereo blaring, or operating from a closed cabin, it takes a lot of noise to get their attention and sometimes you need to get their attention quickly. I would rather someone think my horn is too loud than for them to not hear it at all when they need to hear it.
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Old 02-01-2014, 11:02 AM   #28
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The air horn with a valve control is nice as you can blow a gentle note, or in case of a knucklehead, a full blast.
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Old 02-01-2014, 11:30 AM   #29
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...
It's a personal thing, I guess, but I never really understood the need to have a horn that knocks everyone's socks off. I think they should be very practical things - and because we live in Maine, we probably use our horns more than other boats (because of fog). I really prefer an effective horn and not one that's trying to make a statement.
Are your feelings toward horns similar to those of my liveaboard neighbor? A fellow berther told me the liveaboard thought I was "showing off" when making a prolonged signal while approaching the breakwater at the marina's exit/entrance. He said he told her it was a required signal.

My truth is: to be effective, the horn has to make a statement. I'm not about to make a half-second "mini" signal when a four-second prolonged one is called for.
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Old 02-01-2014, 02:43 PM   #30
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If you want loud and distinct, consider a set of train horns.
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Old 02-01-2014, 02:51 PM   #31
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...... A fellow berther told me the liveaboard thought I was "showing off" when making a prolonged signal while approaching the breakwater at the marina's exit/entrance. He said he told her it was a required signal..
That's another of the "rules" that's commonly ignored by recreational boaters. If I were to use a horn signal when leaving my slip, everyone would think I was just showing off. Anyone sleeping on their boat as I'm leaving about daybreak would think worse.

Fortunately, from my flybridge I can see if anyone is coming or going.

I don't think I've heard these horn signals in transient marinas I've visited either.
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Old 02-01-2014, 02:51 PM   #32
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If you want loud and distinct, consider a set of train horns.
I thought about it, but concluded a horn suitable for a 74-meter boat would be sufficient for an 11-meter boat.
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Old 02-01-2014, 04:39 PM   #33
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If you want loud and distinct, consider a set of train horns.
A couple of the truckers up here put them on there trucks.
They do get a person's attention!!!!!!!!
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Old 02-01-2014, 06:35 PM   #34
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Go to the Buell Horns website and you can hear how their different horns sound.
It kind of fun. I scared the bejeebers out of my wife.
Marine*-*Buell*Air*Horns

What if you're creeping through dense fog and you hear a train horn in front of you?
I'd be thinking I was about to run aground and why is my GPS so far off.
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Old 02-03-2014, 05:47 PM   #35
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When going from "the jump" (Venice) into the BigMiss during heavy fog, which is normal this time of year, the procedure is to pull back and listen carefully. When you are sure nothing is coming, announce your intentions on the appropriate vhf channells, asking for any concerned traffic, then, Lay down on all the horn you can muster, then get you a$$ out in the channell. More horn is better. These are the big boys, they normally monitor the radio very well, but sometimes they dont. Ships never respond, but they pay particular attention to horn signals.
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Old 02-03-2014, 07:18 PM   #36
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These are the big boys, they normally monitor the radio very well, but sometimes they dont. Ships never respond, but they pay particular attention to horn signals.
Therein lies the advantage of AIS. When calling a ship by name on channel 16, I'm 100% at getting a response. That includes 2 ships transiting the Panama City channel when I was just there.

Channel 16 is recorded by the Coast Guard. I have a feeling they know that.
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Old 02-04-2014, 06:37 AM   #37
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Horns use different frequencies to allow some clue on vessel size.

While fun to contemplate the Kalenberg horn for an air craft carrier might nor be good for your whaler.
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Old 02-04-2014, 07:40 AM   #38
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Horns use different frequencies to allow some clue on vessel size..............
Is that a rule somewhere or an assumption?

Either way, it's a good argument for installing a horn that people will assume is on a larger vessel. Better they lay off the throttle and look to see your 24' boat than to just ignore your signal.
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Old 02-04-2014, 07:48 AM   #39
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Is that a rule somewhere or an assumption?
Rule.

To ensure a wide variety of whistle characteristics, the fundamental frequency of a whistle shall be between the following limits:

(i) 70 - 200 Hz, for a vessel 200 metres or more in length;
(ii) 130 - 350 Hz, for a vessel 75 metres but less than 200 metres in length;
(iii) 250 - 700 Hz, for a vessel less than 75 metres in length.
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Old 02-04-2014, 07:56 AM   #40
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Rule.

To ensure a wide variety of whistle characteristics, the fundamental frequency of a whistle shall be between the following limits:

(i) 70 - 200 Hz, for a vessel 200 metres or more in length;
(ii) 130 - 350 Hz, for a vessel 75 metres but less than 200 metres in length;
(iii) 250 - 700 Hz, for a vessel less than 75 metres in length.

I wonder if that's the actual length you are or the length you want to appear to be???
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