Floatation, salt vs freshwater

[Veg]

I have to tape my waterline, down here in the salt, so I can paint at arrival in MN before spashing in freshwater...

Does anyone know how much lower I can expect a 12,500 lbs boat (dry weight) to float in freshwater?

 

[TrueBlue]

The density of freshwater is 1.0, compared to sea water at 1.025. This should not have much affect on your boat's flotation. But, if you want to make a comparison, the ratio is 41:40 - do the math.

 

[pdecat]

Steve is correct in his statement as usual but he forgot on thing. Though ice is 4% less dense than water your boat won’t have any waterline as it will be sitting on top.

 

[Grady Wahoo]

Salt water is 64 pounds per cubic foot. 12,500/64 =195 cubic feet of water displaced

Fresh water is 62.4 pounds per cubic foot. 12,500/62.4 = 200 cubic feet of water displaced

195 x 1.025 = 200, Steve's formula works for me....

200/41=4.878 and 195/40=4.875, close enough to 41:40....