Boat

Abstract: The present invention refers to a boat, and more specifically to a launch, which shows a series of building peculiarities guided to provide it with a high resistance, great lightness and a perfect stability against possible side rolls, it all on account of the incorporation of a keel (1) with a determined configuration, the inner surface of which defines three swellings (4,5) appreciably semicylindrical placed in parallel to the longitudinal axis of the boat and which extend practically along the whole length of said boat, grooves or flutings of the same length being defined between saids wellings.

Description: OBJECT OF THE INVENTION The present invention refers to a boat, and more specifically to a launch, which shows a series of building peculiarities aimed to provide it with a high resistance, great lightness and a perfect stability against possible side rolls, it all on account of the incorporation of a keel with a determined configuration such a boat type is known from EP-A-0 298 050. BACKGROUND OF THE INVENTION Today, boats of this kind are widely known, built with light materials such as plastic, resins and polyester fibres, etc., and in which the keel is fastened on the lower surface of the hull, a watertight cavity being defined between both, that can be filled with air of with a filling material of low density. In this kind of boats the part forming the keel shows in its centre a rib which projects in a more pronounced way in the bows area; on the sides of this central rib, surfaces markedly flat are each laid out, which progressively bend as they extend away the central area of the boat in order to form the lower area of the sides. This configuration of the keel, combined with the lightness of the boat, makes necessary to include in it a inner structure in order to provide it with a higher stiffness; on the other hand the configuration appreciably flat of the sides of the keel does not allow to obtain the wanted stability against the possible side rolls caused by the swell or by the moving of the crew on deck. DESCRIPTION OF THE INVENTION The invention is defined in claim 1. The boat object of the invention, keeping the same composition of elements (keel and upper body) than the conventional boats, shows features in the configuration of the keel aimed to provide it with a great side stability and a high resistance, which allows to suppress any chassis or inner structure of reinforcement. According to the invention, the lower surface of the keel defines three swellings appreciably semicylindrical placed in parallel to the longitudinal axis of the boat and which extend practically along the whole length of said boat, grooves or flutings of the same length being defined between said swellings. In order to facilitate the displacement on the water of the boat, the three mentioned swellings show the ends of the bows bent towards the upper area. The central swelling can show a height higher than the two side swellings defining, only the former and in the front end, two side planes that converge on a central edge, the purpose of which is to facilitate the penetration of said central swelling in the water. The two side swellings are placed slightly sloping towards the rear area of the boat, adopting longitudinally a position appreciably slanting with regard to the central one. The alternation of the swellings with the intermediate grooves or flutings provides this keel with a great resistance; in addition, when a side roll takes place the side swellings act as balancing elements since, when a small side inclination is produced, an important volume of the swelling concerning the same side is introduced into the water, thus receiving immediately an upward thrust tending to balance the boat. Another of the advantages of this keel is that of reducing the surface in touch with the water when the boat is displacing with a high speed, the stability being kept since said contact is established at the medium area by the central swelling and at the two sides by means of the other two swellings. DESCRIPTION OF THE DRAWINGS. In order to complement the description that is being made and with the object to facilitate a better comprehension of the features of the invention a set of drawings is attached to the present descriptive specification, as an integral part thereof, wherein it has been represented with an illustrative and not limiting character as follows: Figure 1 shows a side view of the advocated boat. Figure 2 shows a view from stem of the boat. Figure 3 shows a bottom plan view of the boat. Figure 4 shows a view from the bows of the same boat in the previous figures. PREFERABLE EMBODIMENT OF THE INVENTION As it can be seen in the example of embodiment shown in the figures, the boat to the case consists of a hull (1) and an upper body (2) joint together by their perimetal edges (3), a watertight cavity being defined between them filled with air or with a filling material of low density, for instance polyurethane foam. The upper body (2) can define in its medium area any configuration or element proper for this kind of boats, in order to allow a correct handling of the boat and lodging of the passengers. Starting form this composition, already known, the boat proposed here furnishes as main features that the keel (1) shows in its lower surface three swellings (4, 5 and 4), two of them on the sides (4) and one in the centre (5), appreciably semicylindrical, placed in parallel with regard to the longitudinal axis of the boat and which extend practically along the whole length of said boat, the grooves or flutings (6) being defined between said swellings. The mentioned swellings (4 and 5) show their front ends bent towards the upper area in order to facilitate the displacement of the boat on the water; the central swelling (5) shows also in said front end two side planes (51) that converge on a central edge (52) the aim of which is to allow the penetration of said boat into the water. As it can be seen in the figure (1) the side swellings (4) are placed slightly sloping towards the rear area of the boat, adopting longitudinally a position appreciably slanting with regard to the central swelling (5), which in addition is more projecting that the aforementioned ones. Materials, shape, size and disposition of the elements will be open to variation provided that this does not involve any alteration of the essential features of the invention, that are claimed below.

Claims: A boat built from a light material of the kind consisting of a hull (1) and an upper body (2) being joint to each other at their perimetral edges (3) and defining a watertight cavity filled with air or with a filling material of low density, the hull defining on its outer lower surface three keels, one in the centre (5) and two on each side (4), appreciably semicylindrical, placed in parallel to the longitudinal axis of the boat characterized in that the keels define between them grooves or flutings (6) of substantially the same length as said keels (4), forming an acute angle at the junction of the keels when seen in cross section, the bottom line of the said side keels (4) being raised progresively upwards from aft to bow at an angle with the bottom line of the central keel (5), said bottom line of the central keel (5) adopting a curvature towards the bow and the central keel defining two side plans (51) that converge in a central edge (52) at the bow of the boat.

Inventors: MASSA PORRATO GIOVANNI, MASSA PORRATO, GIOVANNI
Applicants: TECN DEL POLIESTER GM S L, TECNICAS DEL POLIESTER GM, S.L.
Application year: 1998
Main classification: B63B1
IPC codes: B63B1