The Engel nautilus, which is about the same size, only needs 1000ml of ballast, so one of those spheres should have been enough, unless the lay-up is very thick. The Disney nautilus has low freeboard, so doesn't need big tanks.
The empirical method of trimming your boat to neutral buoyancy or just slightly negative, then using foam blocks to get it to the required waterline is the most foolproof method of deciding tank volume.
Using weight, tends to give you larger tanks than necessary unless the hull is styrene or some other unfilled plastic, plus it's difficult to measure as a hull rarely splits dead on the waterline.
The empirical method of trimming your boat to neutral buoyancy or just slightly negative, then using foam blocks to get it to the required waterline is the most foolproof method of deciding tank volume.
Using weight, tends to give you larger tanks than necessary unless the hull is styrene or some other unfilled plastic, plus it's difficult to measure as a hull rarely splits dead on the waterline.
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