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 joe 
    you dont reduce displacement by 
adding water. displacement = the total volume of all non free flooding  
spaces. 
the introduction of large internal ballast 
tanks  creates a sinificant engineering problem and a possible piont of 
flooding for the passenger spaces. most hard tanks are hard to inspect for 
corrosion. not to try to rain on your parade, the kiss pricipal seems to be the 
way to go here, if you ever want to get in the water.  
rick m 
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