Re: in mast furling issues?
There is a boat with in mast furling in Heriot Bay BC. When the strong westerly blows, you can hear the thing howl a half mile away, for days on end sometimes. They have tried hauling things up inside to quieten it down, with no success. So they turned the boat around and she went quiet, til the wind blew from the opposite direction. Then the howling resumed, as loud as ever.
Brent Swain, Yacht designer, Builder, and author of "Origami Metal Boatbuilding"