Ships – Displacement-type hull – Multiple hulls
Patent
1993-09-08
1994-11-22
Basinger, Sherman
Ships
Displacement-type hull
Multiple hulls
114288, 114290, 114291, B63B 120
Patent
active
053658698
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a catamaran with induced hydrodynamic stability.
BACKGROUND OF THE INVENTION
As it is known, racing catamarans or catamarans used for pleasure boating, usually called "two-points", or also the relevant models, have a forward configuration with two convergent bottoms or hulls, such as the bottoms of the monohull motorboats. This configuration has major drawbacks, especially during the races run in basins not perfectly calm.
In fact, it may happen that one of the two bottoms slips into the waves either due to a piloting mistake or falling down from the jumps the catamaran may make. In this way, it often occurs that, at best, there is just a spin-around of the catamaran, which at cruising speed can be very dangerous anyway, whereas, at worst, there may be the complete capsizing of the catamaran with the possible ejection of the pilot, with easily imaginable consequences.
U. S. Pat. No. 3,113,543 discloses a boat with two catamaran-like appendages having opposite slopes developing into a V-shaped hull at the boat end with the aim of obviating the difficulties of an inverted V-bottom boat, which is not suitable for high speeds in racing.
However, this solution could not be adopted in a real catamaran to overcome the above-mentioned problems due to the high speed experienced in racing.
The aim of the present invention is to eliminate or substantially reduce the above-mentioned drawbacks of known type catamarans by devising an induced hydrodynamic stability catamaran, which eliminates the possibility of spin-arounds or capsizings of the catamaran itself.
Within the scope of the mentioned aim, an object of the present invention is to obtain a catamaran maintaining the same driving and performance characteristics of known type catamarans.
Not last object of the present invention is to obtain a high reliability catamaran, fairly easy to build and at competitive costs.
SUMMARY OF THE INVENTION
The aim stated above, as well as the mentioned objects and others which will be clearer later on are achieved by an induced hydrodynamic stability catamaran including a hull formed by a pair of longitudinally extended semi-immersible appendages, arranged parallel to each other and symmetrically to the centre-line of the hull, the respective bottoms of which, at the forward ends of said appendages, have mutually opposite slopes, contrary to the slope of the aft rest of the bottom, with respect to the median symmetry plane of the hull.
BRIEF DESCRIPTION OF THE DRAWINGS
Further characteristics and advantages of the invention will be apparent from the description of some preferred, but not exclusive, embodiments of an induced hydrodynamic stability catamaran according to the invention, illustrated as indicative and non-limiting examples in the annexed drawings, wherein:
FIG. 1 is a perspective view from below of a first embodiment of a catamaran according to the invention;
FIG. 2 is a front elevational view from the stern side of the catamaran of FIG. 1;
FIG. 3 is a plan view from below of the catamaran of FIG. 1;
FIG. 4 is a side elevational view of the catamaran of FIG. 1;
FIG. 5 is a front elevational view from the bow side of the catamaran of FIG. 1;
FIG. 6 is a perspective view from below of a second embodiment of a catamaran according to the invention;
FIG. 7 is a plan view from below of the catamaran of FIG. 6;
FIG. 8 is a front elevational view from the bow side of the catamaran of FIG. 6;
FIG. 9 is a perspective view from below of another embodiment of a catamaran according to the invention;
FIG. 10 is a plan view from below of the catamaran of FIG. 9;
FIG. 11 is a perspective view from below of a further embodiment of a catamaran according to the invention;
FIG. 12 is a side elevational view of the catamaran of FIG. 11; and
FIG. 13 is a side sectional elevational view along the axis of the catamaran of FIG. 11.
DETAILED DESCRIPTION OF THE INVENTION
Referring to the FIGS. from 1 to 5, an induced hydrodynamic stability catamaran includes a hull, schematicall
REFERENCES:
patent: 1712281 (1929-05-01), Royer
patent: 2969760 (1961-01-01), Eddy
patent: 3148652 (1964-09-01), Canazzi
patent: 4348195 (1982-09-01), Lantz
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