by 
HungryGuy
ANSWERS: 2
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A boat can be thought of as a 'hole in the water'. It floats becasue it 'pushes aside' an amount of water that weights the same as the boat its self. For example, if you have a boat that weights 10,000 lbs, then it will 'settle' into the water until it has pushed aside 10,000 lbs of water. This is called the 'Displacment' of the boat. When designign a boat, they caculate the total weight, and then knowing how much water weights per cubic foot, can calculate how many cubic feet of the hull needs to be submerged to make the numbers match up. Side note: Different water has different "weights" (More correctly called Densities). Salt water is more dense, and a boat will 'float' higher then in fresh. This mostly applies to larger ships
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OK. So, I am not an expert here, but basically you need to take into account two things: 1) How much hull needs to settle into the water to balance out displacement, and then if there is anything additional attached below the bottom of the 'hull' (e.g., a Keel, or skeg). I did a Google search, and came up with this reference: http://www.boatdesign.net/forums/showthread.php?t=14705 which gives some guidelines, ruff calculations. You need to know how long the part of the hull is that is in the water (called LWL), this is almost always LESS then to overall (LOA) of the boat because of the shape. Likewise, you need to know the width in the water, and then apply a factor to account that the hull is not a square box. Combined with 64lbs/cubic foot for water gets close. Another idea (and this might be a more reliable solution): Go to www.yachtworld.com, and search the 'Boats for Sale'. Look for one that is close to what you are thinking of, and you can pick up some real world examples. Good luck!
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