Ice on Headstay Foil

[lancelot9898]

Another thread raises a question that I had from a couple of winters ago concerning ice storms. I remove all sails from the boat and leave the boat in the water during the winter here on the Cheaspeake. During that ice storm with some 25 knot winds I went to the slip and saw the headstay viberating wildly. Apparently some sort of natural frequency was reached. No other sailboats in the marina had this problem. I boarded the boat and tied a line with a rolling hitch to the foil to dampen the movement. Don't remember how I got that rolling hitch to hold with the ice coating on the foil. Anyway now I always tie a line to the furler foil to preclude that from happening again. I use to live aboard the boat during the winter and have never observed that in the past and the tension in that headstay has not changed much over the years and is fairly snug. I use the folding rule method to put around 20% BT in the backstay and with a masthead rig that tension should be about the same in the headstay. Has anyone else observed this happening to their roller furling foil?