Rig noise - SailNet Community
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post #1 of 8 Old 07-31-2019 Thread Starter
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Rig noise

So I'm getting a lot of rig noise and not sure why? I have a Jeanneau 419 with an in-mast furler. This is my first season with the boat and using an in-mast furler. When on the mooring I get a lot of wind noise via the vibrating topping lift. Is that normal? The attached photo shows the mast end of the US Spar boom. Should there be an end cap to help reduce wind through the boom?

In my former Sabre with a traditional masthead rig and stackpack mainsail, I only experienced rig noise in winds above 25 and even then it was tolerable...

Thanks in advance for the help...

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post #2 of 8 Old 07-31-2019
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Re: Rig noise

We had a hood furl in mast system on one of our boats.

One attribute of these things is that the slot that the sail rolls into in the mast can form sort of a wind whistle. I found it particularly troublesome on a mooring if the wind and tide were opposing, or on a dock when the wind was coming from the stern. There is something called a flute stopper which you slide into the aperture to block it and stop the flute from fluting (if that's a word?).

This may not be your problem, but we've seen or should I say heard this problem on many in mast furling boats.
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post #3 of 8 Old 07-31-2019
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Re: Rig noise

Stuff a plastic bag in the boom hole as a test to see if it cuts the noise.

(if you are too environmentally friendly to use plastic try shoving in a seagull)


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post #4 of 8 Old 07-31-2019
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Re: Rig noise

The slots may be an issue, but they are usually whistling type noises, not vibrations. I find messing with the tension of the running rigging can usually dampen, if not stop vibration. Often, with a furling rig, the furling and outhaul can have way too much tension, if you used a winch to tend them.


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post #5 of 8 Old 07-31-2019
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Re: Rig noise

it is not clear to me if you are getting a vibration from the topping lift causing it to "sing", like a guitar string ... or if you are getting a hum from air blowing over the hollow section of the boom, like a flute.

if the former you can change the point at which it will sing by changing the tension or by changing the mass of the line. I had the same situation with my topping lift years ago. You can play with the tension a bit using the vang. But I found that increasing the mass of the string had the most pronounced effect. I did this temporarily by tying a length of line to the topping lift (a few 1/2 hitches along 4 or 5ft). I did this anytime I was at anchor, and it worked nicely. Basically by increasing the mass of the line I was changing its resonance point. I permanently solved it by replacing the topping lift with a heavier line.

if the latter, I like Mark's idea to stuff it with a seagull.
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post #6 of 8 Old 07-31-2019
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Re: Rig noise

my topping lift is 1/4" and will sing even in light wind if it is to tight from tightening the mainsheet or vang

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post #7 of 8 Old 07-31-2019
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Re: Rig noise

Quote:
Originally Posted by MarkofSeaLife View Post
Stuff a plastic bag in the boom hole as a test to see if it cuts the noise.

(if you are too environmentally friendly to use plastic try shoving in a seagull)


Beak first or tail first??? Either way, you have another hole to deal with.
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Last edited by ImGary01; 07-31-2019 at 12:25 PM.
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post #8 of 8 Old 08-02-2019
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Re: Rig noise

We tie a line to the end of the boom and cleat it to the side. With the Vang off and the hydraulic backstay with just light tension (to save the seal) it makes the boom immovable (good for safety) then the spring in the Vang holds the boom up and the topping lift isnít doing much of anything. Use the traveler to position and lightly tension the line from the end of the boom and main sheet The gooseneck isnít rubbing back and forth. Thereís no movement in the boom at all and no ďsingingĒ from anything. Tension in any of the above lines is light so no creep nor stress.

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