A magnetic levitation rotor sail is proposed. The rotor sail may include a coil unit provided at a lower portion of a body of the rotor sail, and an electromagnet configured to levitate the coil unit. The rotor sail may also include a support member supporting the electromagnet, and a gap sensor provided at the support member and configured to measure a gap between the coil unit and the electromagnet.

Watercrafts that include a fluid system are described. An example watercraft includes a fluid system, a hull, a sail, and a compressor. The hull has a bow and a stern. The sail has a first end, a second end disposed on the hull, a lengthwise axis, a central axis, a first side, a second side, and defines an injection opening, a suction opening, and a channel. The lengthwise axis extends from the first end to the second end. The central axis is disposed orthogonally to the lengthwise axis and between the first side and the second side. The suction opening is disposed on the second side and between the injection opening and the first side. The channel extends from the suction opening to the injection opening such that fluid can travel into the suction opening and exit the injection opening. The compressor is disposed within the channel.

Watercrafts that include a fluid system are described. An example watercraft includes a fluid system, a hull, a sail, and a compressor. The hull has a bow and a stern. The sail has a first end, a second end disposed on the hull, a lengthwise axis, a central axis, a first side, a second side, and defines an injection opening, a suction opening, and a channel. The lengthwise axis extends from the first end to the second end. The central axis is disposed orthogonally to the lengthwise axis and between the first side and the second side. The suction opening is disposed on the second side and between the injection opening and the first side. The channel extends from the suction opening to the injection opening such that fluid can travel into the suction opening and exit the injection opening. The compressor is disposed within the channel.

An upright tank-based propulsion assistance rotor sail system is proposed. The system may include an upright tank fixed to a hull of a ship, and a rotor sail in a form of a cylindrical shape having a length and diameter greater than or equal to the upright tank, and installed to surround part or all of an outer circumferential surface of the upright tank. The rotor sail may be rotatably installed while surrounding the upright tank concentrically with the upright tank, and may be movable along a height direction of the outer circumferential surface of the upright tank to maintain a predetermined height. In addition, a vessel equipped with the upright tank-based propulsion assistance rotor sail system is proposed. The fuel tank may be installed to stand upright on the vessel so that the rotor sail is installed to be movable in the vertical direction.

An upright tank-based propulsion assistance rotor sail system is proposed. The system may include an upright tank fixed to a hull of a ship, and a rotor sail in a form of a cylindrical shape having a length and diameter greater than or equal to the upright tank, and installed to surround part or all of an outer circumferential surface of the upright tank. The rotor sail may be rotatably installed while surrounding the upright tank concentrically with the upright tank, and may be movable along a height direction of the outer circumferential surface of the upright tank to maintain a predetermined height. In addition, a vessel equipped with the upright tank-based propulsion assistance rotor sail system is proposed. The fuel tank may be installed to stand upright on the vessel so that the rotor sail is installed to be movable in the vertical direction.

A method of manufacturing a sail body (3) for forming part of a wind assisted propulsion device (4), the method comprising the steps of: laying a first fabric (14), formed from first fibres, onto a mould (16) defining the shape of a part (2) of the sail body (3); laying a plurality of strips (22), formed from second fibres, onto a surface of the first fabric (14) such that at least some of the second fibres extend longitudinally along the sail body (3).

The invention pertains to a Flettner-type type rotary rigging (100) comprising a tower (131, 132) comprised inside a cylindrical outer skin (121) centered on a vertical axis (110) of rotation and comprising a connection with the cylindrical outer skin (121) and comprising a tower structure consisting of an assembly of structural members comprising wood fibers.

The invention pertains to a Flettner-type type rotary rigging (100) comprising a tower (131, 132) comprised inside a cylindrical outer skin (121) centered on a vertical axis (110) of rotation and comprising a connection with the cylindrical outer skin (121) and comprising a tower structure consisting of an assembly of structural members comprising wood fibers.

The propulsion system for vessels comprises at least one suction sail (3), the at least one suction sail (3) comprises a suction system (10) and a transmission unit (8) to drive the rotation of the suction sail (3), wherein the suction sail (3) comprises at least two suction zones (7) arranged symmetrically on two sides of the suction sail (3), the suction zones (7) including suction holes. It provides a propulsion system for vessels that allows reducing their fuel consumption and polluting emissions by using an improved version of suction sails.

The propulsion system for vessels comprises at least one suction sail (3), the at least one suction sail (3) comprises a suction system (10) and a transmission unit (8) to drive the rotation of the suction sail (3), wherein the suction sail (3) comprises at least two suction zones (7) arranged symmetrically on two sides of the suction sail (3), the suction zones (7) including suction holes. It provides a propulsion system for vessels that allows reducing their fuel consumption and polluting emissions by using an improved version of suction sails.