Re: M_Boats: Re: previous board diagram

thanks for the tip perhaps you can give me a simple solution for this next project. I have found several different sources of closed cell foam, some pour in and some cut to measure blocks and boards, that I plan to use to achieve positive flotation, Some foam is labeled 1.7 and some 2.2 lbs per cu ft. The heavier types of closed cell I do not plan on using. Compared to a cubic ft of air, what is the best way to find the positive floatation mark on the boat to keep the height of the cockpit seat level with the outside water level but no deeper. For example: suppose the worst case scenario and the boat is completely filled with water (saltwater that is) I want the water to drain out to the level to or less than the cock pit seats.