A propulsion system for an aquatic vessel is provided. The propulsion system includes a plurality of Magnus-type rotors and a drive arrangement for rotating the plurality of Magnus-type rotors. The plurality of Magnus-type rotors are operable to rotate about corresponding substantially upright axes. The propulsion system also includes a control arrangement for receiving one or more measured apparent wind speeds and for controlling the drive arrangement to vary rates of rotations of the plurality of Magnus-type rotors. The rates of rotations may, for example, be varied as functions of the measured apparent wind speeds and a direction of travel of the aquatic vessel. Moreover, the control arrangement includes a user-operable control for adjusting propulsion provided by the plurality of Magnus-type rotors. The control arrangement is operable to control the drive arrangement to vary a drive applied to rotate one or more Magnus-type rotors from the plurality of Magnus-type rotors.

A propulsion system for an aquatic vessel is provided. The propulsion system includes a plurality of Magnus-type rotors and a drive arrangement for rotating the plurality of Magnus-type rotors. The plurality of Magnus-type rotors are operable to rotate about corresponding substantially upright axes. The propulsion system also includes a control arrangement for receiving one or more measured apparent wind speeds and for controlling the drive arrangement to vary rates of rotations of the plurality of Magnus-type rotors. The rates of rotations may, for example, be varied as functions of the measured apparent wind speeds and a direction of travel of the aquatic vessel. Moreover, the control arrangement includes a user-operable control for adjusting propulsion provided by the plurality of Magnus-type rotors. The control arrangement is operable to control the drive arrangement to vary a drive applied to rotate one or more Magnus-type rotors from the plurality of Magnus-type rotors.

The present disclosure relates to a ship's propulsion unit such as a ship's azimuthing propulsion unit. The propulsion unit can include at least one supporting metal sheet arranged between an support section of a shell structure of the propulsion unit and an cylindrical outer surface of a cylindrical section of a motor housing section of the shell structure for providing additional support for the motor housing section of the shell structure at the shell structure of the support section.

The present disclosure relates to a ship's propulsion unit such as a ship's azimuthing propulsion unit. The propulsion unit can include at least one supporting metal sheet arranged between an support section of a shell structure of the propulsion unit and an cylindrical outer surface of a cylindrical section of a motor housing section of the shell structure for providing additional support for the motor housing section of the shell structure at the shell structure of the support section.

A mobile marine barrier (1) comprising a base (2) and a hood (8) located at a distal end thereof is described. The hood (6) comprises a funnel (15) and a distal surface (18) located therein which allows the hood (6) to morph its shape, size and strength so as to give adaptable coastal protection against naturally occurring events. This is achieved by incorporating a telescopic funnel such that the length of the hood (6) and thus the area of its open end can be altered so as to vary the quantity of water directed towards the distal surface (18). The hood (16) may also comprise a mobile face (17) that forms part of variable volume chamber (26) located within the hood (8) which can be filled and emptied with fluids.

A mobile marine barrier (1) comprising a base (2) and a hood (8) located at a distal end thereof is described. The hood (6) comprises a funnel (15) and a distal surface (18) located therein which allows the hood (6) to morph its shape, size and strength so as to give adaptable coastal protection against naturally occurring events. This is achieved by incorporating a telescopic funnel such that the length of the hood (6) and thus the area of its open end can be altered so as to vary the quantity of water directed towards the distal surface (18). The hood (16) may also comprise a mobile face (17) that forms part of variable volume chamber (26) located within the hood (8) which can be filled and emptied with fluids.

A pool cleaning device is provided, including: a main body; a rotating unit rotatably disposed on the main body, the rotating unit including a rotating member, a fluid outlet extending radially outward from the rotating member, and a first positioning protrusion extending radially outward from the rotating member and spaced apart from the fluid outlet; and a reversing member including a plurality of stoppers spaced apart from each other and disposed along a path of rotation of the rotating member. Each of the plurality of stoppers is reciprocable between a position in a path of rotation of the first positioning protrusion and a position out of the path of rotation of the first positioning protrusion.

A pool cleaning device is provided, including: a main body; a rotating unit rotatably disposed on the main body, the rotating unit including a rotating member, a fluid outlet extending radially outward from the rotating member, and a first positioning protrusion extending radially outward from the rotating member and spaced apart from the fluid outlet; and a reversing member including a plurality of stoppers spaced apart from each other and disposed along a path of rotation of the rotating member. Each of the plurality of stoppers is reciprocable between a position in a path of rotation of the first positioning protrusion and a position out of the path of rotation of the first positioning protrusion.