Hi everyone My dad owns an 18' Daysailer and I would like to buy him a mainsail cover as a present. However, I can't very well go out with a tape measure - he'd get a little suspicious! Could someone give me the measurements required for a mainsail cover? Don't know whether you measure just the boom or boom and mast but I'm sure someone out there knows that too! Thanks for your help, in advance, and my dad will be thrilled to not have to take his sails off everytime we go out. You can contact me directly at NancyLStarr@aol.com. Thanks again, Nancy