Sailboat with a pivoted mast-to-hull mounting system

Details Sailboat with a pivoted mast-to-hull mounting system Sailboat with a pivoted mast-to-hull mounting system

1990-07-03

1991-12-17

Swinehart, Ed

Ships

Spars

Masts and masting

114 39001, B63B 3902

Patent

active

050726820

ABSTRACT:
Substantial improvements in design, cost, performance, safety and comfort could be had in sailboats if the hull were to navigate in a level attitude even under strong wind conditions. This is achieved by the present invention by virtue of the mast pivoting on the hull along a longitudinal axis of the vessel. In this way the wind pressure on the sail generates a forward component and a lateral component, the former being the useful wind force which the mast transmits through the pivot to the hull of the boat to propel it. The lateral component, which in conventional fixed-mast boats causes the hull to list depending on the wind direction and force, is not transmitted by the pivot to the hull but causes the part of the mast holding the sail to tilt leeward about the pivot. In order to counter the lateral wind force the invention further provides a counterweight joined to the bottom part of the mast, below the pivot, to generate a resisting torque which balances the mast at an appropriate angle depending on wind conditions. Preferably, the counterweight is situated underwater and is shaped to hydrodynamically complement the underwater surface of the hull. The conventional keel may be dispensed with or substantially reduced. The invention is also applicable to catamarans wherein the mast may be mounted to pivot in the middle of the structure supporting the pair of hull floats.

REFERENCES:
patent: 713830 (1902-11-01), York
patent: 3324815 (1967-06-01), Morales
patent: 3885512 (1975-05-01), Marcil
patent: 3972300 (1976-08-01), Adamski
patent: 4686922 (1987-08-01), Burroughs
patent: 4817550 (1989-04-01), Gutsche

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