[Rhodes22-list] Keblinskas & Wind-induced noise in rigging/mast while docked

[Jim Connolly]

Since I am on a mooring, I don't get wind across the mast slot.  I do
sometimes get a similar noise, more of a humm humm humm (a deep tome with
about a 2-cycle per second volume oscillation).  The source, I found by
accident was an overly tight topping lift.  I had the habit of pulling the
mainsheet tight and cleating it off to keep everything stowed on the
mooring.   The wind vibrates the topping lift line like a big bass fiddle.
I detected it when I grabbed the topping lift about 2' above the cabin top,
and the noise stopped.  I just slack the mainsheet a small amount and it
stops.  Hope this is helpful.

Jim Connolly
s/v Inisheer
'85 recycled '03

-----
From: rhodes22-list-bounces at rhodes22.org
[mailto:rhodes22-list-bounces at rhodes22.org] On Behalf Of Rory Orkin
Sent: Tuesday, May 20, 2008 5:09 PM
To: rhodes22-list at rhodes22.org
Subject: Re: [Rhodes22-list] Keblinskas & Wind-induced noise in rigging/mast
while docked


I get the noise also.. What exaxtly do you mean by "boom cord". Topping lift
??


I just went through this on the keys trip. I also get a hummmmming noise. I
felt around the boat and it did not seem to be the IMF. I could feel the hum
more in the boom, but that wasn;t the source either. It was the boom cord
going from between the rear stays all the way to the top. It gets a
frequency going. I bungeed the boom cord at the rear to the rear stays and
that was all she wrote. 


Tootle wrote:
> 
> Al:
> 
> I get a hummmm... which increases as wind increases... HUMMMM...
> 
> Ed K
> Greenville, SC, USA
> "The latest survey shows that three out of four people make up 75% of 
> the population."
> 
> 
> 
> 
> 
> keblinskas Keblinskas wrote:
>> 
>> 
>> I keep my '97 Rhodes 22 on the Boca Ciega Bay of St. Petersburg, FL , 
>> docked on a lift, with mast up, at my back yard seawall, on the St. 
>> Pete Beach island side of the bay. The dock is fairly well sheltered 
>> around all points,except the North. The periodic winter cold fronts 
>> blow in from the North with 20+ knot gusty wind which produces a 
>> horrendous wailing howl in the rigging/mast.
>>  
>> While docked, the boat's stern faces NE ; it seems to me the wailing 
>> noise must be caused by the wind entering the IMF's hollow mast 
>> groove and then exiting near the top producing the howl, like an 
>> organ pipe. I don't think the noise is from the shrouds.
>>  
>> Please let me know if any of you have experienced or heard of someone 
>> else running into something similar, with any IMF system. If so, has 
>> anybody come up with a method to mitigate this problem, other than 
>> lowering the mast / derigging or docking the boat so that the stern 
>> (and mast groove) faces to leeward?
>>  
>> Your comments will be very appreciated, so I thank you in advance,
>>  
>> Al Keblinskas
>> 
>> 
> 
> 

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