Ships – Displacement-type hull – Multiple hulls
Patent
1997-07-14
2000-06-06
Avila, Stephen
Ships
Displacement-type hull
Multiple hulls
114 6115, 114 6117, 114123, B63B 100
Patent
active
060705442
ABSTRACT:
A boat has a main hull and a pair of outriggers which extend to distal, capsizing-resistance formations. The capsizing-resistance formation are relatively diminutive:--they displace a substantially small fractional amount of water relative to what the main hull displaces. Also, the capsizing-resistance formations are shaped and arranged such that in contact with the water under forward velocity it provides a generally upward capsizing-resistance force through a given center of action, which force is transmitted by the outrigger to the main hull as an applied capsizing-resistance moment. Given the foregoing, the outriggers position of the capsizing-resistance formations generally outboard and rearward such that said centers of the upward capsizing-resistance force lie spaced substantially outboard or behind a plane containing the stern of the main hull in order to stabilize the fore-to-aft pitching as well as side-to-side rolling of the main boat hull in accordance with boat speed and wave conditions. The capsizing-resistance formations can be either floats shaped and arranged to skim the water surface and provide an upward capsizing-resistance force which comprises a combination of buoyancy and planing forces, or else planes shaped and arranged to plane on the water surface and provide an upward capsizing-resistance force which comprises substantially planing forces, or alternatively asymmetric foils shaped and arranged to plane the water surface or fly if submerged and provide an upward capsizing-resistance force which is alternatively substantially a planing force or hydrodynamic lift.
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Deborah Druan, "The Power Trimarans: Ilan Vogayer," Multihulls (magazine), Oct./Nov. 1989.
Avila Stephen
Bay Jonathan A.
Tri-Span, L.L.C.
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