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Old 04-13-2006
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Hull form is a factor also. Many round-bilged boats are initially tender, heeling easily in light breezes, but firm up as the righting arm of the ballast increases.

Flat bottomed boats with hard turns (or possible chines) in the bilges provide what is known as "form stability" and initially resist heeling due to the bouyancy of the hull sections. These types of boats, if insufficiently ballasted, are particularily tender once the form stability has been overcome, and rely heavily on crew weight & placement for righting moment.
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