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post #7 of Old 03-01-2012
Jon Held
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Location: Manhattan, KS - LaBelle, Fl
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One other thing related to this topic, Dynamic Stabilty, it enters in here too. It is the measure of the change in the location of the center of boyancy versus angle of heel, Multihulls have very high dynamic stability, the center of boyancy moves out very quickly and makes the boat stable even though the center of mass is above the center of boyancy. A standard hull has some dynamic stabilty, more beam, more stable. This is what can make a boat have two stable points, rightside up and pefectly upside down, or a cat be more stable upside down.

Also to get terminology correct, we should be using Moment of inertia instead of angular momentum, Momemt of inertia is the measure of the distribution of mass away from the center of mass (the mast being raised vs on deck, has it's center farther away from the total center of mass, therefore increasing the moment of inertia.)

Quick dynamics lesson. Momentum is mass times velocity, it's a linear thing, (acting in a straight line.) Conservation of momentum, means when something moving crashes into something not moving, they end up moving at an amount equal to the initial mass moving divided by the total mass moving after the crash. Conservation of angular momnetum is the same thing in a rotational sense, Moment of inertia before times angular velocity before equals amount after.

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Last edited by jheldatksuedu; 03-01-2012 at 05:09 AM.
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