A thruster assembly to create shaped waves in a water behind a boat for water sports, such as wake surfing. The thruster assembly comprises one or more thrusting channels, an outer body the outer body comprises a round surface in the form of a circular or elliptical cross-section. The outer body comprises an elongated elliptical cross-section being wider than it is tall. A thruster portion comprises a width, a height, and a depth. The outer body comprises an outer surface and an inner surface. The outer body comprises a round surface in the form of a circular or elliptical cross-section. The outer body comprises an elongated elliptical cross-section being wider than it is tall.

A thruster assembly to create shaped waves in a water behind a boat for water sports, such as wake surfing. The thruster assembly comprises one or more thrusting channels, an outer body the outer body comprises a round surface in the form of a circular or elliptical cross-section. The outer body comprises an elongated elliptical cross-section being wider than it is tall. A thruster portion comprises a width, a height, and a depth. The outer body comprises an outer surface and an inner surface. The outer body comprises a round surface in the form of a circular or elliptical cross-section. The outer body comprises an elongated elliptical cross-section being wider than it is tall.

The present disclosure relates to a method (1) and an apparatus (10) for adjusting flow properties of a propeller (103) of a propulsion system (100) for watercrafts (1000), in particular for boats and ships, depending on the operation state, comprising the steps of determining the operation state (2) of the propulsion system (100), wherein in the propulsion system (100) either a thrust state or a generator state, in particular a hydrogeneration state for generating energy by hydrogeneration, is present, and adjusting the flow properties (3) of the propeller (103) based on the determined operation state.

Various embodiments are directed to interconnectable tiles configured for operation in an aquatic environment or a near-zero/zero gravity environment. The interconnectable tiles are configured to interconnect relative to one another to form interconnected surfaces, and individual interconnectable tiles provide thrust, ballast, and/or buoyancy to the overall interconnected surface so as to move the interconnected surface in a desired configuration.

Various embodiments are directed to interconnectable tiles configured for operation in an aquatic environment or a near-zero/zero gravity environment. The interconnectable tiles are configured to interconnect relative to one another to form interconnected surfaces, and individual interconnectable tiles provide thrust, ballast, and/or buoyancy to the overall interconnected surface so as to move the interconnected surface in a desired configuration.

An electric underwater jet motor designed for vehicles traveling above or below the sea. The electric underwater jet motor includes a plurality of stators for marine crafts; at least one radial stator, at least one rotor, at least two impeller blades, a magnetic bearing; at least one permanent magnet bar; at least one axial stator, hydrodynamic bearing components, a motor housing and an engine fastener; a hydrodynamic jet motor housing; and a control unit including a microprocessor, a software, magnetic bearing distance sensors, counter and speed measurement sensors, gyroscopic balance sensors to provide comfortable travel by collected data to reduce an effect of sea currents and wave movements which are the consequences of seasickness on the passengers at sea, heat and humidity sensors, pressure measurement sensors, voltage and ampere measurement sensors, a motor drive circuitry, software algorithms, an energy management system, a control panel, batteries and battery charging components.

An electric underwater jet motor designed for vehicles traveling above or below the sea. The electric underwater jet motor includes a plurality of stators for marine crafts; at least one radial stator, at least one rotor, at least two impeller blades, a magnetic bearing; at least one permanent magnet bar; at least one axial stator, hydrodynamic bearing components, a motor housing and an engine fastener; a hydrodynamic jet motor housing; and a control unit including a microprocessor, a software, magnetic bearing distance sensors, counter and speed measurement sensors, gyroscopic balance sensors to provide comfortable travel by collected data to reduce an effect of sea currents and wave movements which are the consequences of seasickness on the passengers at sea, heat and humidity sensors, pressure measurement sensors, voltage and ampere measurement sensors, a motor drive circuitry, software algorithms, an energy management system, a control panel, batteries and battery charging components.

An accelerating ducted propeller system for propelling boats offers enhanced performance, having the front end of the nozzle disposed at a radial distance (H) between 0.045D and 0.082D from the inner radius of the nozzle, where D is the inner diameter of the nozzle. The front end of the chord of the axial profile of the nozzle has a larger radius than the rear end of the chord with respect to the axis of rotation of the propeller. The inner surface of the nozzle at the axial distance (J) of 0.025D from the rear end of the output edge of the nozzle is at a radial distance from the inner radius of the nozzle of more than 0.0040D and less than 0.0300D. The radial difference between the inner radius of the nozzle and the outer radius of the profile of the nozzle is less than 0.092D.

An accelerating ducted propeller system for propelling boats offers enhanced performance, having the front end of the nozzle disposed at a radial distance (H) between 0.045D and 0.082D from the inner radius of the nozzle, where D is the inner diameter of the nozzle. The front end of the chord of the axial profile of the nozzle has a larger radius than the rear end of the chord with respect to the axis of rotation of the propeller. The inner surface of the nozzle at the axial distance (J) of 0.025D from the rear end of the output edge of the nozzle is at a radial distance from the inner radius of the nozzle of more than 0.0040D and less than 0.0300D. The radial difference between the inner radius of the nozzle and the outer radius of the profile of the nozzle is less than 0.092D.

The present invention relates to a propulsion unit nozzle for being arranged around a propeller in a propulsion unit, comprising: a load bearing core structure extending in a circumference of the propulsion unit nozzle; and a plurality of hydrodynamic elements mounted on and enclosing the core structure thereby defining the outer and the inner surfaces of the propulsion unit nozzle. The invention further relates to a propulsion unit for a vessel comprising a propulsion unit nozzle and to a method for the manufacture of a propulsion unit nozzle.