On our latest trip north, we anchored in Clam Bay and had a strange problem. At a certain wind speed, the shrouds would start to hum, sometimes making the boat shake with vibration. The major vibration was felt in the small rod running to the underside of the upper spreaders and in the mast and backstay. I backed each shroud one off half a turn and it really didn't do much except make those shrouds look loose to me, but I'm sure I can't tell the difference of 1/128th of an inch. It eventually faded as the wind dropped. For the next ten days, in all sorts of conditions, we didn't hear it, but when we anchored in the same bay 10 days later, we got it again. Any explanation except witchcraft?
Jim Watts Paradigm Shift C&C 35 Mk III Victoria, BC
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