A rotating machine with a fluid rotor comprises a set of blades (4) mounted on arms (2) rotating about a main axis (1) of the rotor, the rotor being held by a support structure (5) in an orientation such that said axis (1) is essentially perpendicular to the direction of the flow of fluid, each blade (4) being mounted pivoting about a respective axis of rotation (3) parallel to the main axis (1), the machine comprising a linkage (13, 7, 14) for generating a relative rotational movement of each blade (4) relative to the arm (2) of same at the axis of rotation (3) thereof, in order to thus vary the tilt of the blade relative to the flow of fluid in an angular range. According to the invention, the machine comprises means for collectively modifying the geometry of the linkages (13, 7, 14) from a movement generated at the main axis of the rotor in order to vary the amplitude of the angular range.

An arrangement is described includes a pressurised gas system and a cyclorotor located within an annular structure. The cyclorotor can be a propulsor for a marine vessel and includes a rotary housing spaced apart from the structure by an annular volume, and a plurality of blades extending from a surface of the rotary housing, each blade having a respective blade axis about which it can be pivoted relative to the rotary housing. The pressurised gas system includes a pressurised gas supply, one or more gas outlets in fluid communication with the annular volume, and a gas supply unit with a controller adapted to control the delivery of pressurised gas from the pressurised gas supply into the annular volume through the one or more gas outlets.

An arrangement is described includes a pressurised gas system and a cyclorotor located within an annular structure. The cyclorotor can be a propulsor for a marine vessel and includes a rotary housing spaced apart from the structure by an annular volume, and a plurality of blades extending from a surface of the rotary housing, each blade having a respective blade axis about which it can be pivoted relative to the rotary housing. The pressurised gas system includes a pressurised gas supply, one or more gas outlets in fluid communication with the annular volume, and a gas supply unit with a controller adapted to control the delivery of pressurised gas from the pressurised gas supply into the annular volume through the one or more gas outlets.

A propulsor for a marine vessel is described. The propulsor includes a plurality of blades extending from a rotary housing. The blades are distributed around a blade pitch circle diameter of the rotary housing. A mounting plate rotatably mounts the rotary housing to a hull of the marine vessel. A slewing bearing includes a driven ring with a driven gear that is fixed to the rotary housing and a stationary ring fixed to the mounting plate. A diameter of the slewing bearing is at least 0.4 times the blade pitch circle diameter. The propulsor includes a main electric motor with a drive shaft mechanically connected to a driving gear. The driven gear of the slewing bearing and the driving gear define a single-stage transmission gear with a transmission ratio between 5:1 and 15:1.

A propulsor for a marine vessel is described. The propulsor includes a plurality of blades extending from a rotary housing. The blades are distributed around a blade pitch circle diameter of the rotary housing. A mounting plate rotatably mounts the rotary housing to a hull of the marine vessel. A slewing bearing includes a driven ring with a driven gear that is fixed to the rotary housing and a stationary ring fixed to the mounting plate. A diameter of the slewing bearing is at least 0.4 times the blade pitch circle diameter. The propulsor includes a main electric motor with a drive shaft mechanically connected to a driving gear. The driven gear of the slewing bearing and the driving gear define a single-stage transmission gear with a transmission ratio between 5:1 and 15:1.

A method for controlling a propulsion system of a marine vehicle is disclosed. A controller forms data on pitch angles of at least two foils, which are in a rotatable manner attached with a foil wheel, based on at least an angularly variable eccentricity of the at least two foils and an angle of rotation of the foil wheel. The variable eccentricity is limited at a portion of the angle of rotation of the foil wheel. An actuator arrangement receives the data from the controller and sets the at least two foils at the pitch angles based on the data.

A method for controlling a propulsion system of a marine vehicle is disclosed. A controller forms data on pitch angles of at least two foils, which are in a rotatable manner attached with a foil wheel, based on at least an angularly variable eccentricity of the at least two foils and an angle of rotation of the foil wheel. The variable eccentricity is limited at a portion of the angle of rotation of the foil wheel. An actuator arrangement receives the data from the controller and sets the at least two foils at the pitch angles based on the data.

A tugboat for assisting cargo vessels has the following features: at least one propelling unit and a tow line for establishing a pulling connection between the cargo vessel and the tugboat. A measuring device measures the bollard pull and a central processing unit records the measurement result and forms a control command relating to the propelling force and/or the propelling direction for propelling purposes.

A marine vessel comprising a command module, first and second buoyant tubular foils, and first and second struts for connecting the first and second buoyant tubular foils to the command module, respectively, wherein the first and second buoyant tubular foils provide substantially all buoyancy required for the marine vessel, and wherein the marine vessel further comprises first and second engines enclosed within the first and second buoyant tubular foils, respectively, and first and second propulsion units connected to the first and second engines, respectively, for moving the marine vessel through water, and means for reducing drag on the vessel as the vessel moves through water.

A marine vessel comprising a command module, first and second buoyant tubular foils, and first and second struts for connecting the first and second buoyant tubular foils to the command module, respectively, wherein the first and second buoyant tubular foils provide substantially all buoyancy required for the marine vessel, and wherein the marine vessel further comprises first and second engines enclosed within the first and second buoyant tubular foils, respectively, and first and second propulsion units connected to the first and second engines, respectively, for moving the marine vessel through water, and means for reducing drag on the vessel as the vessel moves through water.