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 Swing Keel Cable Hum revisited		  New Topic  Topic Locked
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pfduffy
Captain

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USA
317 Posts
Initially Posted - 06/20/2011 :  13:59:56  Show Profile
I know there have been a number of threads regarding the song of the swing keel. While sailing yesterday, I got to thinking about the ramifications of this vibration. The PO of the boat had an issue where the tube glassed into the top of the volcano that the turning ball is pinned into broke off while underway. Is it possible that this vibration occurring over the course of 20 years could have caused the fiberglass to fail?

In the spirit of full disclosure, he had not replaced the keel cable or turning ball in 20 years and the turning ball no longer turned and had a groove sawed into it by the cable.

Am I crazy to think that the humming of the cable could be detrimental to the volcano?
Pat Duffy
1984 SK/SR #4113
Slàinte
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Davy J
Master Marine Consultant

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USA
1511 Posts
Response Posted - 06/20/2011 :  15:03:39  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Is it possible that this vibration occurring over the course of 20 years could have caused the fiberglass to fail?<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
My guess is that 20 years of deferred maintenance caused the failure. I know some will disagree, but when sailing I let the cable go slack. I just hate that noise.
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pfduffy
Captain

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USA
317 Posts
Response Posted - 06/20/2011 :  17:10:24  Show Profile
I don't like that noise either.
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Captnkev25
1st Mate

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USA
36 Posts
Response Posted - 06/20/2011 :  17:31:09  Show Profile
I do the same. I lower till slack then take up MOST of the slack. Just enough so I don't get any overrides on the winch and I won't get the 5 knot hum.
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Captnkev25
1st Mate

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USA
36 Posts
Response Posted - 06/20/2011 :  17:36:35  Show Profile
I do the same. I lower till slack then take up MOST of the slack. Just enough so I don't get any overrides on the winch and I won't get the 5 knot hum.
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 06/20/2011 :  18:09:57  Show Profile
I crank back a turn or two after the slack is out. A slack cable will flop around; a cable with tension will vibrate, and the frequency is determined by the tension. Lower tension may put the vibration below an audible frequency. I don't mind the sound and it gives me a rough idea of speed. Dolphins appear to be curious about it when I'm at the gulf; they come closer, dive under the boat, and hang around longer when I'm going fast enough to hum.
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triley
Captain

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USA
251 Posts
Response Posted - 06/22/2011 :  18:32:06  Show Profile
I do the same. The hum is annoying.
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Unsinkable2
Captain

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USA
273 Posts
Response Posted - 07/03/2011 :  20:51:32  Show Profile  Visit Unsinkable2's Homepage
Dave B - I don't think the cable hum has anything to do with dolphins. After reading your post I decided to give it a shot. I tried all manner of frequencies. no Dolphins.
Come to think of it though, I don't ever recall seeing dolphins on Utah Lake...
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 07/04/2011 :  08:27:18  Show Profile
Doesn't seem to work an Lake Erie either, it must be a southern thing.
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calden
Navigator

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USA
194 Posts
Response Posted - 07/04/2011 :  09:45:03  Show Profile
I crew on my friend's J/24. On the mast is an oval hole that was once used as the exit for an internal halyard. When we get moving more than 5 knts and the wind is right, it starts to generate a low tone that slips in and out of the next harmonic (minor third.) It sounds like an eerie, soft singing.

I once yelled "Tie me to the mast, boys, and plug your ears with wax, and don't untie me no matter how much I beg you to!" But no one knew what I was talking about.

Carlos
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 07/05/2011 :  13:39:16  Show Profile
Traditions and epics are worth keeping alive.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.