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A Multihull Primer
"The fundamental difference between the two broad classes of boats is the method used to provide righting moment, which balances the heeling moment applied by the wind’s force on the sails. If you just took a canoe and attached a mast with a big piece of cloth, it would sail downwind just fine… but trying to sail “off the wind” would likely lead to immediate capsize. Monohulls solve this problem with a heavy keel (usually made of lead to maximize the ratio of weight to surface area and resulting hydrodynamic drag); multihulls solve it with additional buoyancy located away from the centerline of the boat."
(Submitted by Noel Thu Apr 8, 2004 )
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