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People have been filling their hulls with water to check for leaks since before Napoleon. Filling with water may not get an accurate answer, though, since some floats (like my SeaRail) have front sealed compartments that won't be 'fillable' from the accesses (has breatherhole to equalize pressure on hot/cold day, but no way for air to escape to fill). I don't know if beachcat hulls are built that way, though. Some smaller tris are right'able by filling one float with water as much as possible and standing on it--so I'm pretty sure filling the float will not hurt it. Given the tortuous shapes of floats, without the design drawings, you won't have an easy way to calculate the buoyancy and not many frankentri builders will be able to submerge a hull and measure how much water is displaced--hence the suggestion to fill with water a gallon at a time. On the chance that you have a bunch of buddies available, though, you could add one person at a time straddling the float until it is underwater. Would like to see the video if anyone does it!Are you sure this is the way to go? The water pressure from inside the hull might ruin it. Sinking the hull in water would equal the inside/outside pressure, though.
But the idea to find out the ama volume is important, but there is not one answer to this. The importance of this is when we are talking of a tri with lifting center hull. If not lifting it is more a question of righting moment.
About the Searail 19 I wonder if its tiny amas, can take the weight of the boat+crew(1000lbs?), but I am sure you have the figures?
The SeaRail is not designed to lift the center hull-and the amas are not tiny unless you are comparing with an F31 or bigger. The volume is about 850 pounds buoyancy (I had the design drawing)--or about the same as the weight of the boat without crew.