When the boat is on the mooring and a stiff wind is blowing something creates a harmonic vibration (a low moaning noise), which is transmitted down the mast. Its sounds to me as if a shoud is vibrating. I have checked everything I could think of.
on our 336 with inmast furling the topping lift generates teh noise you describe. We tied a small piece of rope to the topping lift to cut the vibration. -w
The rigging and in some cases the topping lift are stretched taut like a banjo string. The wind acts like a violin bow and vibrates the strings. The hull is the sound box. Voila! A musical instrument. Fitting a rigid vang may help if its the topping lift causing the sound, otherwise try bungee cords on the rigging to dampen the vibes.
I have the same issue on my h30t. When I am staying on the boat, I take the main halyard and go around the topping lift several times and attach it to the end of the boom. It creates a similar solution that you see on car antennas, a spiral that disturbs the wind going over the line.
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