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Prospector
Master Marine Consultant

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Canada
3159 Posts
Initially Posted - 06/07/2010 :  06:12:44  Show Profile  Visit Prospector's Homepage
At what windspeed does the rigging start humming?

The forecast winds for our Saturday race were 23 gusting to 30. I just wonder what the wind actually was. We definately had the hum going for a while, but I'm not sure how else I could gauge actual conditions. Maybe sailflow will still have history.
"Iris"
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Prospector
Master Marine Consultant

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Canada
3159 Posts
Response Posted - 06/07/2010 :  06:16:25  Show Profile  Visit Prospector's Homepage
Sail flow shows 10kts gusting to 20, but th eobservation point is about 15 km away, not sure if its accurate. Any ideas out there?
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Stinkpotter
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Djibouti
9087 Posts
Response Posted - 06/07/2010 :  06:32:48  Show Profile
I've heard mine whistle (scream) in the upper twenties and above, and had mast-pumping in the high teens to low twenties... This will vary based on your rig tension--mine was pretty tight.
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jerlim
Master Marine Consultant

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USA
1484 Posts
Response Posted - 06/07/2010 :  07:33:54  Show Profile
us too...high twenties w/ a pretty taut rig gets it humming...maybe that's the origin of 'humming along"??...have never seen/noticed mast-pumping though - I'm guessing it has something to do w/ harmonic vibrations?
Edited by - jerlim on 06/07/2010 07:34:57
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Prospector
Master Marine Consultant

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Canada
3159 Posts
Response Posted - 06/07/2010 :  09:50:16  Show Profile  Visit Prospector's Homepage
OK - thanks guys. I thought it was in the beaufort tables, but not so much. I can accept high 20s as a ballpark number to work from.
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Stinkpotter
Master Marine Consultant

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Djibouti
9087 Posts
Response Posted - 06/08/2010 :  06:40:49  Show Profile
I think it has everything to do with your particular rig--wire size, length, tension, etc. The "mast pumping" I can best describe as a thumping sound, maybe about 3 times per second. There are some articles describing the forces that generate this harmonic motion.
Edited by - Stinkpotter on 06/08/2010 06:43:58
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jbkayaker
Captain

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USA
299 Posts
Response Posted - 06/10/2010 :  13:32:37  Show Profile
Go to this weather history website to find out what the wind speed was on any recent date.
http://www.wunderground.com/history/
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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.