Norman two things to think on.
1. pin all hatches shut whilst sailing.
2. Cotton sails have high surface tension when wet.
I had my Emma C Berry get hit by a squall that laid her flat on the water surface tension kept her there as I watched hatch covers float away and she quickly filled with water and sank with top of main mast visible in wave troughs 100m from shore in the middle of winter was crook for months afterwards.
Edited By Damien Gardner on 02/11/2014 00:25:15