A MARINE SURFACE VESSEL COMPRISING AN AIR VENTILATED HULL

Abstract

A marine surface vessel includes an air ventilated hull, and a deck, where the vessel includes at least one air conduit leading to at least one ventilation opening beneath a waterline of the vessel. The at least one air conduit is arranged to guide air to the at least one ventilation opening, where the deck is at least party surrounded by a gunwale, where the at least one air conduit is arranged to guide the air from at least one water drainage opening arranged to drain water from the deck.

Claims

1-6. (canceled)

7. A marine surface vessel comprising an air ventilated hull, and a deck, wherein the vessel comprises at least one air conduit leading to at least one ventilation opening beneath a waterline of the vessel, the at least one air conduit being arranged to guide air to the at least one ventilation opening, the at least one ventilation opening being provided for air ventilation of the hull, wherein the deck is at least party surrounded by a gunwale, characterised in that the at least one air conduit is arranged to guide the air from at least one water drainage opening arranged to drain water from the deck, the vessel comprising one or more non-return valves arranged to prevent water from being transported through the at least one air conduit from the at least one ventilation opening to the at least one water drainage opening.

8. A marine surface vessel according to claim 7, wherein the water drainage opening is located at a lowest part of the deck.

9. A marine surface vessel according to claim 7, wherein at least one of the at least one water drainage opening is provided in a steering console of the vessel.

10. A marine surface vessel according to claim 7, wherein a non-return valve is provided at a respective of the at least one ventilation opening.

11. A marine surface vessel according to claim 7, wherein the air ventilated hull is arranged so that, during a planing progress of the vessel, the hull is, in front of, as well as aft of, the at least one ventilation opening, submerged in the water.

12. A marine surface vessel according to claim 7, wherein the at least one ventilation opening is provided at at least one step of the vessel hull.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Below, embodiments of the invention will be described with reference to the drawings, in which:

[0022] FIG. 1 shows a vertical cross-section of a marine surface vessel, the cross-section coinciding with a longitudinal axis of the vessel,

[0023] FIG. 2 shows a perspective view of a cross-section of the vessel in FIG. 1, the cross-section being oriented as indicated by the arrows II-II in FIG. 1, wherein some hidden parts are indicated with broken lines,

[0024] FIG. 3 shows a vertical cross-section of a part of a hull of a marine surface vessel according to an alternative embodiment of the invention, and

[0025] FIG. 4 shows a view, similar to the one in FIG. 1, of a marine surface vessel according to a further embodiment of the invention.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

[0026] FIG. 1 shows a longitudinal, vertical section of a marine surface vessel in the form of a rigid-inflatable boat (RIB). Herein a longitudinal axis of the vessel is understood as an axis which is parallel to a direction of straight travel of the vessel. The vessel in FIG. 1 comprises a solid, shaped hull 201 and flexible tubes 202 at a gunwale 203. The hull 201 may be made in any suitable material, such as steel, wood, aluminium, or fibre-reinforced plastic, such as glass-reinforced plastic (GRP) composite, or carbon reinforced plastic. The hull may comprise a single skin, or it can be a sandwich construction. The hull 201 may be any of a variety of types, e.g. a “deep-V hull”, a “shallow-V” hull, a catamaran hull, or a trimaran hull.

[0027] The vessel further comprises a deck 205. The vessel is an open vessel, and the deck 205 is uncovered. The deck 205 is partly surrounded by a gunwale 203. The gunwale 203 reaches along the sides of the vessel, and around the bow 101. At the stern 102, an outboard engine mounting board 207 is provided. The mounting board 207 joins port and starboard stern end regions of the gunwale 203. One or more outboard engines 204 are mounted on the mounting board 207. Thus, the deck 205 is surrounded by the gunwale 203 and the mounting board 207.

[0028] In the example shown in FIG. 1, the solid hull 201 reaches to the top of the tubes 202. Thereby, the solid hull 201 forms an internal part of the gunwale 203. Hence, only a forward end of the tubes 202 are visible in the cross-section of FIG. 1. The tubes 202 are provided outside of the solid hull, along the sides thereof. The tubes 202 may be joined at the bow 101.

[0029] It should be noted that the invention is equally applicable to alternative types of vessels. For example, the vessel may have a fully rigid hull. The vessel may have one or more inboard engines.

[0030] The vessel further comprises a steering console 206. The console 206 is in this embodiment surrounded by the deck 205. In alternative embodiments, the console may reach laterally up to the gunwale 203. Thereby, a deck may be provided in front of the console 206, and another deck may be provided behind the console 206. The steering console comprises control devices for a driver of the vessel, such as a steering wheel, engine control devices, and instruments. The console 206 may further house equipment for the vessel, or for a mission of the vessel.

[0031] The vessel is a planning boat. The vessel hull 201 comprises a step 208. The step 208 extends laterally on the hull. The vessel comprises an air ventilated hull. For this, the vessel comprises an air conduit 301 leading to a plurality of ventilation openings 302. The ventilation openings 302 are provided beneath the waterline WL of the vessel. The air conduit 301 is arranged to guide air to the ventilation openings 302.

[0032] The air conduit 301 is arranged to guide the air from water drainage openings 303. The water drainage openings are arranged to drain water from the deck 205. The water may have splashed over the gunwale 203 onto the deck 205. The water drainage openings 303 are provided above the waterline WL. The water drainage openings 303 are provided in the console 206. The water drainage openings 303 are provided in a forward facing surface 2061 of the console 206. The water drainage openings 303 are located at the deck 205. The water drainage openings 303 are located close to the deck 205. Thereby, the water drainage opening 303 are located closer to deck 205 than to an upper edge 2031 of the gunwale 203.

[0033] In the example described here, the deck 205 is substantially planar. In some embodiments where the deck 205 is non-horizontal, or non-planar, e.g. curved, or formed from sections, where adjacent sections are oriented in a non-zero angle to each other, the water drainage opening 303 are preferably located at a lowest part of deck.

[0034] The discharge of air from the ventilation openings 302, which air is introduced through the water drainage openings 303, reduces the surface friction of water against the hull. Thereby, the vessel is enabled to plane more readily. In addition, the vessel may thereby reach higher speeds when the vessel is in a planning position. In addition, the air discharge prevents formation of regions of reduced pressure adjacent the step, thereby further decreasing the drag of the hull. Further, embodiments of the invention provide for draining of water on the deck 205 through the ventilation openings 302.

[0035] Reference is made also to FIG. 2. The step 208 comprises a vertical surface 2081 connecting a surface 2011 forward of the step 208 with a surface 2012 aft of the step 208. As can also be seen in FIG. 1, the surface 2012 aft of the step is recessed so as to be shallower than the surface 2011 forward of the step 208. Thus, the vertical surface 2081 forms an aftwards facing surface. In this example, the surface 2012 aft of the step 208 has a V-shape which is less deep than the V-shape of the surface 2011 forward of the step 208. This can be seen in FIG. 2. Said difference in V-shape may reduce a planing threshold speed of the vessel.

[0036] As can be seen in FIG. 2, in this example, the vessel comprises four ventilation openings 302. The ventilation openings 302 are provided in the vertical surface 2081 of the step.

[0037] Further, in this example, three water drainage openings 303 are provided in the console 206. The air conduit 301 comprises a first chamber 3011 on the inner side of the console, (see also FIG. 1). The water drainage openings 303 lead into the first chamber 3011. The first chamber 3011 leads into a connection conduit 3012. The connection 3012 leads into a second chamber 3013. The second chamber 3013 is provided at the step 208. The ventilation openings 302 lead out of the second chamber 3013.

[0038] Reference is made to FIG. 3. In some embodiments, a non-return valve 304 may be provided at a respective of the ventilation openings 302. Each non-return valve 304 may be provided as a rubber flap 304. In alternative embodiments, each non-return valve may be provided as a hinged, stiff flap, e.g. in metal or plastic. The non-return valves 304 prevent water from entering the air conduit 301 when the vessel is reversed.

[0039] Reference is made to FIG. 4, showing an alternative embodiment of the invention. The vessel 1 in FIG. 4 has the same features as the one described with reference to FIG. 1 and FIG. 2, except for the following difference: The air drainage openings 303 are provided in the deck 5.

[0040] It is to be understood that the present invention is not limited to the embodiments described above and illustrated in the drawings; rather, the skilled person will recognize that many changes and modifications may be made within the scope of the appended claims.