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Multihull sailors have a wonderful term--"zone of death"--to
refer to the sailing angle where they cannot head up or down when
hit by a puff. The only action that can be taken to relieve heel
is easing the sheets. Otherwise, when broad reaching and the boat
starts to load up, you head down. When close reaching and the boat
begins to heel, you head up.
The actual angles at which you head up or down will vary with wind
and sea state, and, of course, boat design. The faster the boat
accelerates (the lighter and more highly powered it is) the wider
the zone of death. Steering control, which varies with design and
between cats and tris, also figures into this equation.
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