need help quick... MAST vibrations - SailNet Community

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  #1  
Old 01-01-2008
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need help quick... MAST vibrations

Having horrible vibrations in mast (as if you were tohold a rubber band taught between fingers and flick the middle)

Rigging is tight have forestay and aft 2 each at port and starboard just below spreader and then 1 each port and starboard to top of mast.

its a rather violent shake and I am concerned anyone else have this problem...suggest or preferrably know a fix?
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Old 01-01-2008
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A strong breeze can set up a mast vibration under certain circumstances. Does this occur while sailing underway, or at dock/anchor with sails furled? If you have roller furling, but no jib is set, sometimes the aluminum furler extrusion can induce a serious resonation in the rig. The quick fix is to put some tension on it by tying it off with a line led back to a cleat or the mast.

More info would be helpful.
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Old 01-01-2008
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mast....

have a roller furler with the jib set. It only occurs at dock and anchor never while sailing. have tried tightening the two spreader bar stays that are forward no luck.
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Old 01-01-2008
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Could it be resonating through the mast from something underneath? Maybe something to do with the keel or Shaft/cutlass bearing?

Edit . . . Scratch this comment . . . thought you were in motion.
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Old 01-01-2008
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definitely the mast nothing from underneath I can see the mast vibrating. It moves 2-3 inches roughly halfway up the mast and that is vibrating/shaking the boat
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Old 01-01-2008
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I'd axe a qualified "rigging" tech and maybe even have him check it out....
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If its at the dock, with the jib roller furled, I bet on the furled jib creating the vibration. A bungy cord to the pullpit usually fixes it.
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If it's moving 2-3 inches, I can't imagine its doing the rigging or your boat any good. I would loosen the rigging to just more than slack, plumb the mast and re-tune the rig or have a rigger do it if you don't know how.
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How big a boat and is the mast deck or keel stepped
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Old 01-01-2008
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I would definitely check the roller furling jib for being one possible source. You should also contact a rigger, since that type of vibration can lead to the aluminum mast fatiguing... and that becomes a very expensive repair if the mast fails.
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