An objective of the present invention is to provide an underwater ship attachment that is used to divert air, debris, and pressure fluctuations. More specifically, the present invention discloses an anti-cavitation device (such as a diverter device) for flat-bottom boats. The air diverter has been developed to regain, enhance, and protect the operational function of propulsive and steering equipment among displacement and semi displacement hulls. As with protect items such as bottom mounted depth sounder transducers, intakes for engine or general cooling, sea chests, keel coolers, zincs, and all other underwater mounted items susceptible to air ingestion, air disturbance malfunction or debris impact.

The present invention relates to a hull (10) in particular for a container ship, a bulk carrier and a tanker. The hull (10) comprises an elevation (LR) of an outer contour (AK) of the hull (10) with respect to an upwards directed vertical direction (z) of the hull (10) in the region of a first and a second body plan (SP1, SP2) in relation to a surface section (OF) immediately adjoining to the elevation (LR). Therein, the elevation (LR) is arranged in a region between a middle and a stem (16) of the hull (10).

The present invention relates to a hull (10) in particular for a container ship, a bulk carrier and a tanker. The hull (10) comprises an elevation (LR) of an outer contour (AK) of the hull (10) with respect to an upwards directed vertical direction (z) of the hull (10) in the region of a first and a second body plan (SP1, SP2) in relation to a surface section (OF) immediately adjoining to the elevation (LR). Therein, the elevation (LR) is arranged in a region between a middle and a stem (16) of the hull (10).

An outboard drive assembly for a work boat is provided. In embodiments, an outboard drive assembly includes a lower outdrive assembly including: a housing extending between a first and end a second end and having a motor housed therein; a propeller mounted to the first end of the housing; first and second fins extending horizontally from opposing side portions of the motor housing; a third fin extending vertically from the housing; respective cutting blades attached to respective end portions of each of the first, second and third fins adjacent the propeller; an upper outdrive assembly including mounting brackets configure to connect the upper drive assembly to a deck of a work boat; and a drive arm assembly pivotally mounted to the lower outdrive assembly at a first end of the drive arm assembly and mounted to the upper outdrive assembly at a second end of the drive arm assembly.

A cover device for at least partially closing an underwater opening in a hull of a watercraft includes a variable-volume hollow-chamber lip assembly including at least two hollow-chamber lips and one buoyancy body. The at least one hollow-chamber lip is volume-variable by supplying a fluid to or removing a fluid from an interior thereof, and the at least one hollow-chamber lip assembly is shiftable between an expanded state and a contracted state by supplying or removing the fluid.

A cover device for at least partially closing an underwater opening in a hull of a watercraft includes a variable-volume hollow-chamber lip assembly including at least two hollow-chamber lips and one buoyancy body. The at least one hollow-chamber lip is volume-variable by supplying a fluid to or removing a fluid from an interior thereof, and the at least one hollow-chamber lip assembly is shiftable between an expanded state and a contracted state by supplying or removing the fluid.

A system for cutting marine grasses, weeds and other plant life to protect a propeller drive watercraft is disclosed. An adjustable, protective cutting edge to protect a propeller, drive shaft of a boat or other watercraft motor is further disclosed. A propeller protection device to mount upon a watercraft is further disclosed for optimizing the navigation of watercraft and reducing in-piloting maintenance of clearing plant matter from a propeller of a watercraft.

An improved boat and drive assembly intended for a boat used in a primary shallow water environment has a hull with an integrated closed internal engine heat exchanger and a drive assembly that includes a ring-within-a-ring steering mechanism and an obstacle resistant shoe plate. Stabilizer fins positioned above the shoe plate at a position forward of the spinning propeller allow air and water to exit from the rear of the stabilizer fins away from the spinning propeller. The heat exchanger assembly may include an axillary cooling tank and open heat dissipation system having a raw water reservoir continuously filled with raw water drawn directly from the waterway on which the boat is propelled to enhance the cooling capacity of the integrated internal engine heat exchanger.

A propulsion drive assembly for a marine vessel is described. The propulsion drive assembly includes a propeller drive unit for carrying and driving at least one propeller, a housing for connection to a hull of the marine vessel, a suspension mechanism attached to the housing and configured to suspend the propeller drive unit, wherein the suspension mechanism is movable along a first longitudinal axis of the housing between a stowed position, in which the propeller drive unit is positioned inside the inner space of the housing, and a deployed position in which at least a portion of the propeller drive unit protrudes outside the housing through the first opening, and a gas supply device configured to supply gas into the inner space of the housing, the gas supply device comprising a gas pump or a controllable valve connectable to a source of pressurized gas.

A propulsion drive assembly for a marine vessel is described. The propulsion drive assembly includes a propeller drive unit for carrying and driving at least one propeller, a housing for connection to a hull of the marine vessel, a suspension mechanism attached to the housing and configured to suspend the propeller drive unit, wherein the suspension mechanism is movable along a first longitudinal axis of the housing between a stowed position, in which the propeller drive unit is positioned inside the inner space of the housing, and a deployed position in which at least a portion of the propeller drive unit protrudes outside the housing through the first opening, and a gas supply device configured to supply gas into the inner space of the housing, the gas supply device comprising a gas pump or a controllable valve connectable to a source of pressurized gas.