"sherwindu" wrote in message
...
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Multihulls have two stable states, upright
and upside down, whereas most monohulls have only one stable state,
upright. The
monohull has a heavy keel

You have summarised the weak points in the different hullforms. Monos have a
heavy keel= sinkable but self righting. Multis are unballasted= unsinkable
but not self righting.

Saying in the multihull club I used to race with- "better upside down on the
surface than right-way-up on the bottom"

Peter HK