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aluminum pontoon boats
Whats the formula for determinig how much weight a sealed aluminum cylinder can hold in water?
Have a 28' pontoon boat with 2- 24"x 28' pontoons @ 3-1/16" thickness. I want to turn it into a campboat but am concerned about weighing it down too much & making it unstable.
Sorry. Wall thickness is 3/16".
Not 3-1/16"
You need to calculate how much water is displaced by the cylinders.
The volume of one cylinder is (pi)*(radius^2)*(length)
or appx 88 cubic feet
The density of water is 62.4 lbs/ft^3 (per the web site listed as a source)
Therefore each cylinder would support appx 5500 lbs. Since you have two: 11000 lbs.
Of course, this would be the amount a boat would support in calm water with evenly balanced, static loads at zero margin of safety. The real amount I would put on such a craft is probably 20% of this amount. That's still about 2200 lbs.
A better way would be to check the specs on a comparable pontoon boat -- they have a *lot* more experience in building boats and compensating for wind, waves, etc.
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Handicap accessible boat ramp
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