A propulsion system includes at least a first propeller and a second propeller. The propulsion system further includes a first engine configured to directly driving the first propeller and a second engine configured to directly driving the second propeller. The propulsion system further includes a first electric motor provided between the first engine and the first propeller, and a second electric motor provided between the second engine and the second propeller. When the first engine is stopped, the first propeller is configured to be driven by the first electric motor that rotates by power generated by the second electric motor.

An electric marine propulsion system including steering and vertical position control is provided. The electric drive assembly includes a main drive motor transmitting torque through a shaft to a propeller. The electric drive assembly integrates a dual rudder system positioned ahead of the main drive propeller. The rudder assemblies integrate electric stern thrusters for low-speed maneuvering. The steering and vertical position adjustments for the drive assembly are electrically operated. The electric drive assembly is installed entirely outside the hull of the watercraft.

An electric marine propulsion system including steering and vertical position control is provided. The electric drive assembly includes a main drive motor transmitting torque through a shaft to a propeller. The electric drive assembly integrates a dual rudder system positioned ahead of the main drive propeller. The rudder assemblies integrate electric stern thrusters for low-speed maneuvering. The steering and vertical position adjustments for the drive assembly are electrically operated. The electric drive assembly is installed entirely outside the hull of the watercraft.

An intentional fluid manipulation apparatus (IFMA) assembly that includes an upstream intentional momentum shedding apparatus (IMSA) configured to impart a first induced velocity to a local free stream flow during a nominal operation requirement. The upstream IMSA creates a streamtube. The IFMA includes a downstream IMSA, with some or all of the downstream IMSA being located in a downstream portion of the streamtube. The downstream IMSA imparts a second induced velocity to the local free stream flow within the streamtube. The second induced velocity at the location of the downstream IMSA has a component in a direction opposite to the direction of the first induced velocity at the location of the downstream IMSA.

A multihull stepped planing boat with multiple independent elastic planing surfaces includes: a main hull, X front planing sub-hulls arranged side by side under a front portion of the main hull, and Y rear planing sub-hull arranged side by side under a rear portion of the main hull; wherein X and Y are positive integers, and 3≤X+Y≤8; the X front planing sub-hulls are equally spaced, and the Y rear planing sub-hulls are also equally spaced; there is a gap between the X front planing sub-hulls and the Y rear planing sub-hulls. The planing surface of the main hull is formed by a plurality of independent and spaced sub-planing surfaces. There is a certain elastic buffer space between each sub-planing surface and the main hull, and the shock absorption structures can absorb most of the shocks, thereby reducing the impact of water surface waves during high-speed navigation.

A propulsion method includes: providing a pair of synchronized rotors rotatably mounted on a frame with a bearing having a bearing outer race, bearing balls, and bearing inner race; providing a plurality of permanent magnets mounted on the pair of synchronized rotors; rotating the pair of synchronized rotors such that one of the pair of synchronized rotors rotates in a clockwise direction and the other of the pair of synchronized rotors rotates in a counterclockwise direction; loading an outer portion of the outer bearing race, bearing ball, and inner bearing race of each of the bearings, a load on the outer portion of the bearings corresponding to an attractive force between the permanent magnets of the pair of synchronized rotors. A thrust is imparted on the frame in a direction corresponding to a direction of loading of the inner bearing race.

The present invention relates to a hull (10) in particular for a container ship, a bulk carrier and a tanker. The hull (10) comprises an elevation (LR) of an outer contour (AK) of the hull (10) with respect to an upwards directed vertical direction (z) of the hull (10) in the region of a first and a second body plan (SP1, SP2) in relation to a surface section (OF) immediately adjoining to the elevation (LR). Therein, the elevation (LR) is arranged in a region between a middle and a stem (16) of the hull (10).

To provide a marine vessel capable of improving propulsion efficiency for the entire operation of the marine vessel.

In a marine vessel including a hull and a propeller provided on a stern side of the hull, n.sup.2D/√(Bd) is 4 or more and 35 or less, in a case where n is the number of the propeller, D is a diameter of the propeller, B is a water line breadth of the hull, and d is a draft of the hull.

To provide a marine vessel capable of improving propulsion efficiency for the entire operation of the marine vessel.

In a marine vessel including a hull and a propeller provided on a stern side of the hull, n.sup.2D/√(Bd) is 4 or more and 35 or less, in a case where n is the number of the propeller, D is a diameter of the propeller, B is a water line breadth of the hull, and d is a draft of the hull.

A vessel propulsion system includes a bow thruster located at a bow of a hull, an outboard motor located on the hull and provided separately from the bow thruster, and a navigation controller. The navigation controller controls at least one of the bow thruster and the outboard motor in accordance with a state of at least one other of the bow thruster and the outboard motor.