Disclosed is a system for providing an air lubricating layer between the hull of a vessel and the water flowing under the hull as the vessel is moving through the water, including an air cavity and a wave deflector having a planar bottom surface which faces the interface plane and extends parallel thereto and is arranged in an air cavity of the air lubrication system at a distance of 2-15 cm from the interface plane, wherein the bottom surface has a peripheral edge that is spaced apart from the sidewalls by a gap having a width of 0.5-15 cm, wherein, when viewed in projection onto a plane wherein the planar bottom surface extends, at least 85% of the area of the opening is covered by the wave deflector and/or the planar bottom surface thereof, more preferably at least 90%, and most preferably at least 95%.

The present invention relates to a surface cover for a body which can be brought into contact with a liquid, comprising: a layer which at least partly contains gas and which is designed and arranged such that at least some sections of a layer face facing the liquid contacts the liquid; a gas-permeable layer which is arranged on the gas-containing layer on a face that faces the body and is opposite the face facing the liquid or which is integrally formed with the gas-containing layer; and a gas-supplying device which is connected to the gas-permeable layer such that gas can flow from the gas-supplying device to the gas-containing layer through the gas-permeable layer. The invention also relates to an arrangement and a use.

A microstructured surface with microfeatures formed thereon and defining spaces between the microfeatures includes least one electrode of an electrode pair in the spaces, wherein electrodes of the pair are electrically connected to one another. The at least one electrode located in the space is configured to generate a gas in between the microfeatures when an electrolyte solution penetrates into the microfeatures. Importantly, the electrodes are not connected to any external power source. Because the microstructured surface is self-powered in replenishing the gas lost in a submerged condition, no additional provision to supply energy or regulate the replenishment is necessary for implementation and use.

The present invention relates to a surface cover for a body which can be brought into contact with a liquid, comprising: a layer which at least partly contains gas and which is designed and arranged such that at least some sections of a layer face facing the liquid contacts the liquid; a gas-permeable layer which is arranged on the gas-containing layer on a face that faces the body and is opposite the face facing the liquid or which is integrally formed with the gas-containing layer; and a gas-supplying device which is connected to the gas-permeable layer such that gas can flow from the gas-supplying device to the gas-containing layer through the gas-permeable layer. The invention also relates to an arrangement and a use.

Disclosed are a frictional resistance reducing device that effectively reduces the frictional resistance of a ship, and a ship including same. The frictional resistance reducing device comprises: a first air discharge part formed on the leading undersurface of a ship and discharging air into water; a second air discharge part formed behind the first air discharge part and discharging air into water; and an air supplying source supplying air to the first air discharge part and the second air discharge part, wherein the first air discharge part and the second air discharge part are disposed in-line along the lengthwise direction of the ship, and at least a portion of a first air discharge period of the first air discharge part and at least a portion of a second air discharge period of the second air discharge part overlap each other.

A device for reducing hydrodynamic drag of a vessel including a hull; a fuel cell, and a system of conveyance of a first amount of air discharged by the fuel cell to at least one system of injection included by the hull, the system of injection being configured to inject the first amount of air opposite a surface of the hull intended to be immersed.

A cavitator system for suppressing a cavity buoyancy effect and a control method thereof are provided. The cavitator system for suppressing a cavity buoyancy effect includes a cavity generating unit disposed at a front portion of an underwater vehicle and generating super-cavity, a pneumatic hose transferring compressed air stored in a compressed air tank to the underwater vehicle, a ventilation module positioned at a tail portion of the underwater vehicle and including at least one hole ventilating compressed air transferred through the pneumatic hose vertically downwards, and a controller sensing rise of a cavity tail portion and a change in posture of the underwater vehicle when a super-cavity is generated and ventilating compressed air through the ventilation module such that a vertically downward lift is generated at the cavity tail portion.

A boat hull includes a bow section and a flat aft section to allow an air film to be introduced under the boat hull. At least one slot or round hole is arranged proximate a location where the bow section meets the flat aft section. The slot or round hole provides a low-pressure injection point for pumped or drawn-in air and/or exhaust gas, which lubricates an operative surface of the flat aft section.

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.

A cavitator system for suppressing a cavity buoyancy effect and a control method thereof are provided. The cavitator system for suppressing a cavity buoyancy effect includes a cavity generating unit disposed at a front portion of an underwater vehicle and generating super-cavity, a pneumatic hose transferring compressed air stored in a compressed air tank to the underwater vehicle, a ventilation module positioned at a tail portion of the underwater vehicle and including at least one hole ventilating compressed air transferred through the pneumatic hose vertically downwards, and a controller sensing rise of a cavity tail portion and a change in posture of the underwater vehicle when a super-cavity is generated and ventilating compressed air through the ventilation module such that a vertically downward lift is generated at the cavity tail portion.