- Shallowdraftcenterboardvs.deepfixedkeel-trailerablevs.launchedbyboatyard.Asystemusedinsometrailerablesailboatswithoutaweightedfixedkeel.ApopulartrailerablecenterboardsailboatistheMacGregor26,whichwithitswaterballasthastheadvantagesofcenterboardboatsb...
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