Multis are lighter and accelerate faster as a result. They have two hulls which gives them a little edge when it comes to lateral resistance and track pretty well relative to their displacement
. They have incredible initial stability so they heel little. They have no heavy keel
so resist sinking due to an edge in reserve buoyancy.
Some down sides are, they have rather poor ultimate stability, they do not self right. They are lighter which results in a livelier ride. They are much more expensive to construct. They require duplicate systems for each hull
, which is a bonus for safety
and redundancy, but a negative for cost and complexity. They sit high in the water
which is a benefit vs current
but a negative for surface effects such as wave and wavelets.
It's pretty tough to beat an eggshell (monohull) for ultimate strength. Physics suggests that you cant.
Multis are fast, light, spacious and cool.
Monos are tough, with high ultimate survivability, cheap
I give neither an edge on comfort. Cats are often more comfortable in light-moderate conditions, Mono's are often more comfortable in moderate-heavy conditions.
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