I'm researching the concept and implementation of sewing flotation material into the head of my mainsail, and I've found very little except for the description by Geoff Heath in Small Craft Advisor #63 (May/June 2010) where he says he did it. In his drawing the flotation appears to go from near the headboard to near the top batten (that's 50 leech inches on my sail) but does not give any specs like thickness or cubic inches or pounds of positive bouyancy. Other than that all I can do is ask for help, HELP!
I'm thinking someone said they put a throwable seat cushion or a life preserver under the masthead to keep the capsized boat from turtling. Does someone else remember this?