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<blockquote data-quote="Ray Clark" data-source="post: 514057" data-attributes="member: 31103">Yes, I think I&#039;d account for the weight of the hull.&nbsp; My apologies for my confusing response.&nbsp; I&#039;d plan for enough flotation to keep the boat (hull, motor, gear, persons) at least neutrally buoyant.Also, remember that the amount of flotation needed to keep an item neutrally buoyant is less when it&#039;s partially or fully submerged.&nbsp; As an example, personal floatation devices do NOT provide flotation equal to the weight of the person wearing it; it&#039;s only a small fraction of the person&#039;s weight.&nbsp; It&#039;s just enough to provide floatation that will keep the wearer&#039;s head above water.&nbsp; For the PFD I wear, that&#039;s 35 pounds.Fresh water weighs about 8.3 pounds per gallon; salt water about 8.5 pounds per gallon.&nbsp; One of those 2&quot; thick 4X8 sheets of extruded foam displaces a volume of just under 40 gallons.&nbsp; That&#039;s &quot;about&quot; 330 pounds of fresh water displacement per sheet, minus the weight of the foam board (7 1/2 pounds, depending on brand), which leaves about 320 pounds of flotation per 4X8 sheet.I think I&#039;d try to get as much foam in enclosed areas below the water line as I could, taking into account the amount of below-deck volume that I want to preserve for storage, live wells, etc.&nbsp; If you can get that floatation up to the max weight of the boat, you&#039;ll be fine. Anyway, that&#039;s probably more deep thinking than I ought to do at this time of day.</blockquote>

[QUOTE="Ray Clark, post: 514057, member: 31103"] Yes, I think I'd account for the weight of the hull. My apologies for my confusing response. I'd plan for enough flotation to keep the boat (hull, motor, gear, persons) at least neutrally buoyant. Also, remember that the amount of flotation needed to keep an item neutrally buoyant is less when it's partially or fully submerged. As an example, personal floatation devices do NOT provide flotation equal to the weight of the person wearing it; it's only a small fraction of the person's weight. It's just enough to provide floatation that will keep the wearer's head above water. For the PFD I wear, that's 35 pounds. Fresh water weighs about 8.3 pounds per gallon; salt water about 8.5 pounds per gallon. One of those 2" thick 4X8 sheets of extruded foam displaces a volume of just under 40 gallons. That's "about" 330 pounds of fresh water displacement per sheet, minus the weight of the foam board (7 1/2 pounds, depending on brand), which leaves about 320 pounds of flotation per 4X8 sheet. I think I'd try to get as much foam in enclosed areas below the water line as I could, taking into account the amount of below-deck volume that I want to preserve for storage, live wells, etc. If you can get that floatation up to the max weight of the boat, you'll be fine. Anyway, that's probably more deep thinking than I ought to do at this time of day. [/QUOTE]

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