An aircraft propulsion system includes at least first and second electrical generators, each being configured to provide electrical power to a respective first and second AC electrical network. The system further comprises at least first and second AC electrical motors directly electrically coupled to a respective AC network and coupled to a respective propulsor, and a DC electrical network electrically coupled to the first and second AC networks via respective first and second AC to DC converters, and to a further electrical motor, the further electrical motor being coupled to a propulsor.

The present invention relates to a propulsion and braking system using a clutch, the system comprising: a device that has, embedded therein, a clutch operation pressure-regulating valve, and a clutch and gears for controlling a driven body in the same and opposite rotational direction of a driving body; and a control unit for regulating the rotational speed of the driven body so as to enable a continuous operation at a speed that is lower than a rated rotational speed by using the slip of the clutch, and controlling so that the engagement timing control of the clutch and engagement of same are sustained if the driven body requires operation at the rated rotational speed or higher, wherein, when a braking signal is inputted into the control unit during propulsion of the driven body, the control unit removes the operation pressure of the clutch embedded in the device that is in operation, activates the clutch for controlling the rotational direction of the driven body to the reverse rotational direction, and then regulates the operation pressure of the clutch by means of the valve so as to enable the control of the braking of the propulsive body. The propulsion and braking system using a clutch, according to the present invention, is related to all equipment requiring propulsion and braking.

The present invention relates to a propulsion and braking system using a clutch, the system comprising: a device that has, embedded therein, a clutch operation pressure-regulating valve, and a clutch and gears for controlling a driven body in the same and opposite rotational direction of a driving body; and a control unit for regulating the rotational speed of the driven body so as to enable a continuous operation at a speed that is lower than a rated rotational speed by using the slip of the clutch, and controlling so that the engagement timing control of the clutch and engagement of same are sustained if the driven body requires operation at the rated rotational speed or higher, wherein, when a braking signal is inputted into the control unit during propulsion of the driven body, the control unit removes the operation pressure of the clutch embedded in the device that is in operation, activates the clutch for controlling the rotational direction of the driven body to the reverse rotational direction, and then regulates the operation pressure of the clutch by means of the valve so as to enable the control of the braking of the propulsive body. The propulsion and braking system using a clutch, according to the present invention, is related to all equipment requiring propulsion and braking.

A marine propulsion system, comprising a drive shaft secured to a propeller to rotationally drive the propeller; a motor selectively coupled to the drive shaft to rotate the drive shaft; an electrical energy storage unit coupled to the motor to supply an on-board electrical power supply to the motor, the electrical energy storage unit configured to be recharged by an on-shore electrical power supply; an engine selectively coupled to the drive shaft to rotate the drive shall, the engine not coupled to the electrical energy storage unit for use as a generator to recharge the electrical energy storage unit; and a control system coupled to the motor and to the engine for selecting one of the motor and the engine to rotate the drive shaft. A hybrid marine propulsion method, comprising rotationally driving a drive shaft and propeller using an engine; shifting the engine into neutral; turning on an electric motor by manually activating a motor toggle; disengaging the engine from rotational driving engagement with the drive shaft and engaging the electric motor in rotational driving engagement with the drive shaft; and turning on a fluid sub-system to supply fluid to the drive shaft by manually activating a fluid sub-system toggle.

A marine propulsion system, comprising a drive shaft secured to a propeller to rotationally drive the propeller; a motor selectively coupled to the drive shaft to rotate the drive shaft; an electrical energy storage unit coupled to the motor to supply an on-board electrical power supply to the motor, the electrical energy storage unit configured to be recharged by an on-shore electrical power supply; an engine selectively coupled to the drive shaft to rotate the drive shall, the engine not coupled to the electrical energy storage unit for use as a generator to recharge the electrical energy storage unit; and a control system coupled to the motor and to the engine for selecting one of the motor and the engine to rotate the drive shaft. A hybrid marine propulsion method, comprising rotationally driving a drive shaft and propeller using an engine; shifting the engine into neutral; turning on an electric motor by manually activating a motor toggle; disengaging the engine from rotational driving engagement with the drive shaft and engaging the electric motor in rotational driving engagement with the drive shaft; and turning on a fluid sub-system to supply fluid to the drive shaft by manually activating a fluid sub-system toggle.

A fluid machine includes: a shaft portion; a shroud surrounding the shaft portion and including an inside surface that forms a flow path-forming surface defining a flow path with the shaft portion; a first propeller rotatably provided in the flow path; a second propeller rotatably provided on a downstream side of the first propeller in the flow path; and a motor including a rotor that is fixed to an outer circumferential portion of the second propeller and that is accommodated in the shroud, and a stator that surrounds the rotor via a clearance and that is fixed in the shroud. A portion of the flow path-forming surface on a downstream side of the second propeller decreases in diameter toward the downstream side, and the shroud includes an inlet flow path that is open at a portion between the first propeller and the second propeller of the flow path-forming surface.

A novel emissions control watercraft (STAXcraft) solving a long-felt but unsolved need regarding disadvantages associated with prior-art emissions servicing watercraft, the disadvantages selected from the group, but not limited to, the use of tugboats, securing or mooring servicing watercraft to a serviced vessel, additional expenses and time-delays and inefficiencies of land-based approaches, increased toxic emissions, increased greenhouse gases (GHG) emissions, danger from falling cargo, tanker safety, alongside mooring in narrow channels preventing other OGV's to pass safely, and cargo tank emissions.

A novel emissions control watercraft (STAXcraft) solving a long-felt but unsolved need regarding disadvantages associated with prior-art emissions servicing watercraft, the disadvantages selected from the group, but not limited to, the use of tugboats, securing or mooring servicing watercraft to a serviced vessel, additional expenses and time-delays and inefficiencies of land-based approaches, increased toxic emissions, increased greenhouse gases (GHG) emissions, danger from falling cargo, tanker safety, alongside mooring in narrow channels preventing other OGV's to pass safely, and cargo tank emissions.

The invention relates to a surfboard with an electric drive (2), a battery for the electric drive (2), said battery being arranged in a battery housing (3), a first recess (4) for the battery housing (3), and a handle (5) on the battery housing (3), wherein the handle (5) is designed as a D-shaped bracket handle which is pivotally mounted on opposite sides (6) of the battery housing (3) and has a locking mechanism (7) for the first recess (4).

The invention relates to a surfboard with an electric drive (2), a battery for the electric drive (2), said battery being arranged in a battery housing (3), a first recess (4) for the battery housing (3), and a handle (5) on the battery housing (3), wherein the handle (5) is designed as a D-shaped bracket handle which is pivotally mounted on opposite sides (6) of the battery housing (3) and has a locking mechanism (7) for the first recess (4).