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In article ,
(MLapla4120) wrote:

I have a sailboat and when it gets windy at the slip, sometimes
there is a vibration and the mast and rigging seems to resonate and
vibrate. Someone told me this is 'mast pumping'. I was also on
another sailboat visiting and it did it also. Nobody seemed
concerned.

My question is; should I be concerned? We get regular wind here at
twenty knots and sometimes more. The pumping seems to last about 3-5
seconds. Then, it stops and resumes a little later.

Personally, any vibration is of concern. Could keep me up at night ;-)
And any vibration from the rigging *does* add some stress to the systems.

We used to get a bit of hum at times, but after properly tensioning the
rigging, not any more. Boat sails MUCH better, too.

If your leeward shrouds get loose and floppy under sail, the first step
would be adjusting them properly.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/