Fundamental Departure in Concept
The differences between monohulls and multihulls are due to a fundamental difference in their underlying design principles, which can even be traced back to the days of the dugout canoe.
Going to the basic round log; logs are generally unstable and they tend to roll over (capsize) without too much provocation. Hollowing out this log, into a dugout canoe, doesn't help this much, unless the hollowed out section penetrates below the log's center of buoyancy. Any load carried by the dugout then actually stabilizes the craft.
Read more about this topic: Multihull
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