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| | SMALL WATERPLANE AREA TWIN HULL OR SWATH BOAT DESIGN |
 | | For comparison purposes it is useful to think of the 2 hulls of a SWATH ship as geosims* of a single-hull small waterplane area ship having twice as much displaced volume, or buoyancy, i.e. |
 | | Each dimension of a geosim, such as hull length, is related to the corresponding dimension of a single submerged reference hull by, the linear scale ratio, which is defined as the cube root of the ratio of their displacements. |
 | | However, if one uses a large centre submerged small waterplane hull to carry the loads of the vessel, for say 80-90% of the total displaced volume, then use two stabilizing outriggers, in trimaran layout as seen in the top diagram, the total frictional resistance disadvantage falls to 105% of a comparable conventional SWATH vessel. |
| www.solarnavigator.net /small_waterplane_area_triple_hulls.htm (942 words) |
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