There is a principle discussed in traditional
work by sailors like Alard Coles and more modern designers like Steve Dashew. We often think of
capsize as a static
boat experiencing high healing moments. In fact at extreme healing the rig spills most of the healing force.
Capsize at sea usually is more a result of
wind plus sea state. In this instance a shallower
draft can be of help, as the
keel will ventilate as the
boat floats on her topsides, allowing the boat to skid sideways before the sea. A deeper
keel will get caught in the updraft of a breaking wave and "trip ". This principle was modeled by Dashew and was in part responsible for his designs having relatively high free board and
shallow draft. (For 60 footers). In survival storm conditions a bulb, deep fin, or wing may actually be a detriment to resisting capsize. Initial stability and lateral resistance can be a negative at the literal tipping point.
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