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Old 02-04-2014, 07:58 AM   #41
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Great! Now I'm going to get a citation for an out of frequency whistle!

Is that length overall, length on deck, or waterline length?
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Old 02-04-2014, 08:08 AM   #42
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Quote:
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If you want loud and distinct, consider a set of train horns.
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Originally Posted by markpierce View Post
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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A couple of the truckers up here put them on there trucks.
They do get a person's attention!!!!!!!!
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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.
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I wonder if that's the actual length you are or the length you want to appear to be???
Along the same vein, another option for your consideration (perhaps from the swim platform?):
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Old 02-04-2014, 07:41 PM   #43
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What kind of fan is that in the top right of the second picture? We've been looking for some like that, for our ER.
Don't see any manufacturer's labels on the blower, nor did the boat builder list the engine room blowers in the electrical and mechanical parts list. There are two installed. One blows in from the starboard vent, and one blows out the port vent.

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Old 02-04-2014, 10:26 PM   #44
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Could be automotive or truck cooling fans. These show up in newer vehicles rather than the belt driven fans.
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Old 02-04-2014, 10:34 PM   #45
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Don't see any manufacturer's labels on the blower, nor did the boat builder list the engine room blowers in the electrical and mechanical parts list. There are two installed. One blows in from the starboard vent, and one blows out the port vent.
Thanks for the info.
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Old 02-05-2014, 07:27 AM   #46
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One blows in from the starboard vent, and one blows out the port vent.

Far better to have both suck out the heat with a passive intake vent

Pressurizing the engine space could cause exhaust fumes , and the general hot stink of an operating engine enter the passenger spaces.
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Old 02-05-2014, 08:56 AM   #47
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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.
I sure agree with that. That's how I installed mine, just used a little pressure regulator on the airline. The horn specs said it needed 45 lbs minimum pressure if I remember correctly but I crank it down to about 25 for normal use and it still works fine - but when necessary I turn the dial to 60 and can knock leaves off the trees on shore. I don't think I've ever needed that volume though, it's pretty obnoxious, except to signal the start of sailboat races.
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Old 02-05-2014, 09:23 AM   #48
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For the guys that have a manual lever for the horn...I'm guessing you could still put in some kind of electric solenoid for an auto fog horn?
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Old 02-05-2014, 10:35 AM   #49
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Quote:
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One blows in from the starboard vent, and one blows out the port vent.

Far better to have both suck out the heat with a passive intake vent

Pressurizing the engine space could cause exhaust fumes , and the general hot stink of an operating engine enter the passenger spaces.

I agree with FF above: your diesel engine(s) is a great air intake fan already...you just need to ensure the intake vent area matches the requirements of your total HP. Engine room fans should be dedicated to exhausting hot air (which will in itself help draw fresh air in). (Again, unless you have chosen to go down the Delta-T slightly pressurized pathway.)
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Old 02-05-2014, 10:41 AM   #50
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For the guys that have a manual lever for the horn...I'm guessing you could still put in some kind of electric solenoid for an auto fog horn?
Yep, just put the solenoid valve in "parallel" with the manual valve, then when either opens, horn blows. A needle valve downstream or upstream of the solenoid valve can be used to control sound level when in fog mode.
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Old 02-05-2014, 11:23 AM   #51
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I have an electric/manual combination valve.

Electric/Manual Combination Valve V-150AL | Kahlenberg
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