I have a degree in Physics and taught most mechanical engineering classes including Dynamics. Adding weight aloft does not make a boat more stable, it will increase the angualr momentum which will reduce it's roll rate, it will make it take longer to turn turtle. Depending on the freqency of the forcing function (the wave spacing, angle of attack, wind, boat speed, etc.) it might make the boat react less to the forces and feel more stable. A sailboat without a mast is more stable but can react faster to the forces applied to it, it may toss you off the boat because you don't react fast enough or hold on well enough. It has less tendency to turn turtle but can do it faster and will right itself faster. Stabilty and angular momentum are two totally different things. Stability measures the desire to stay upright, (the distance the center of mass is hopefully below the center of boyancy), angular momentum (the amount the mass is spread out), measures the speed the boat can change angle of heel.
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Last edited by jheldatksuedu; 03-01-2012 at 02:40 AM.