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Clueless about living on the boat: Q3 - Wind

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kevinmac
Admiral

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USA
732 Posts

Initially Posted - 10/19/2006 : 23:23:49

So tonight the wind has come up in the marina for the first time. The boat is rockin' and rollin', which I have had before (normal condition practically at my slip in St. Helens). But once in a while the rigging seems to start resonating, and I get pretty strong low frequency vibration. And that is new for me. It feels like the whole mast is shaking. I can also hear the rigging vibrating as well. It is not just a halyard, the whole rig is shaking.

Normal for a C250?

I know, this message sounds a bit too much like "Daddy, what's that noise". Hey, the title said "clueless".

I am going to go outside and watch, see if I can see what is going on...

Kevin Mackenzie
Former Association Secretary and Commodore
"Dogs Allowed"
'06 C250WK #881
and
"Jasmine"
'01 Maine Cat 30 #34

Edited by - on

Russ.Johnson
Commodore

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USA
842 Posts

Response Posted - 10/20/2006 : 01:17:03

Kevin,
I grew up in Camas and know how the wind can blow on the Columbia.
We live in the S.F Bay Area now.
Anyway, I move the main halyard to stanchion where the baby stays connect.
I find if the halyard is a little loose it won't slap as much.

Also, I have a jib sock that flaps in the breeze.
The whole mast would shake when the wind was just right.
I added a small line to the jib halyard and raise the jib sock.
Once raised, I wrap the line around the jib sock a few times until the flaping went away.
If you don't have a jib sock, your jib might be too loose on the furler.
You may want to unfurl the jib and furl it again with more back tension.
You could also wrap the jib sheets around the furler to make it tighter.

I hope this helps.
Russ (#793)

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Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts

Response Posted - 10/20/2006 : 07:02:10

What you describe is mast pumping, an oscilation of the mast. Needed is a "dampening" mechanism. Some have found that a line wrapped around and forming a screw effect kills the lift generated by the wind on the mast and stops the pumping.

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Buzz Maring
Master Marine Consultant

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USA
1766 Posts

Response Posted - 10/20/2006 : 07:26:05

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Arlyn Stewart
 What you describe is mast pumping, an oscilation of the mast. Needed is a "dampening" mechanism. Some have found that a line wrapped around and forming a screw effect kills the lift generated by the wind on the mast and stops the pumping.<hr height="1" noshade id="quote"></blockquote id="quote">
A line wrapped around what?

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britinusa
Web Editor

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USA
5404 Posts

Response Posted - 10/20/2006 : 09:54:38

<blockquote id="quote">quote:<hr height="1" noshade id="quote">A line wrapped around what?<hr height="1" noshade id="quote"></blockquote id="quote">
The Mast :)

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kevinmac
Admiral

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USA
732 Posts

Response Posted - 10/20/2006 : 11:19:46

I think Arlyn's got it, as it very definitely is a mast vibration. I have not managed to "catch" it doing it when I am outside the boat, so I have not been able to verify it visually, but the forestay/jib could not make that much vibration by itself.

Wrapping a line around the mast would be a challenge, not sure how to execute that.

I'll have to ask around, see if some of the old salts around here have a suggestion.

Arlyn, where did you learn about mast pumping? I want to research more...

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Turk
Admiral

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USA
736 Posts

Response Posted - 10/21/2006 : 20:27:26

<blockquote id="quote">quote:<hr height="1" noshade id="quote">[i]
Arlyn, where did you learn about mast pumping? I want to research more...

<hr height="1" noshade id="quote"></blockquote id="quote">

Kevin, you really do have a lot of time on your hands . . .

Just kidding, I'm actually pretty jealous. Just put my boat away for the winter.

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kevinmac
Admiral

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USA
732 Posts

Response Posted - 10/21/2006 : 21:14:30

-Kevin

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