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I was once informed by a very knowledgeable delivery Captain that he used the following guidelines when doing long coastal deliveries.
A typical cruising style motoryacht may be considered at risk if in a fully developed beam sea, the combined wind wave and swell height of the sea is equal to or greater than 20 % of the water line length of the vessel.
So, a boat with 60 ft w/l could be in serious danger for turning over if laying in a beam sea of 12 ft.
So I was told....seems a reasonable guideline and good place to stay away from....
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