A fluid machine includes: a shaft portion; a shroud having an inside surface with a diameter decreasing from an upstream side toward a downstream side, a flow path being formed between the shroud and the shaft portion and having a flow path cross-sectional area decreasing toward the downstream side; a propeller rotatably provided about an axis between the shaft portion and the shroud and configured to pump a fluid from the upstream side toward the downstream side; and a motor provided to correspond to the propeller and including a rotor having a ring-like shape fixed to an outer circumference portion of the propeller and accommodated in the shroud and a stator having a ring-like shape surrounding the rotor and fixed in the shroud, in which a plurality of the propellers are provided to be spaced apart in the axis direction, the motors are provided in an identical number to the propellers to correspond to each of the propellers, and of a plurality of motors, the rotor of the motor positioned more on the downstream side has a smaller average outside diameter.

A method for operating a propulsion device having a propulsor with a propeller, the propulsion device having a base coupled to a marine vessel and being configured to propel the marine vessel in water. The method includes moving the propulsor from a deployed position towards a stowed position, where the propulsor is closer to the marine vessel in the stowed position than in the deployed position, and where the propulsor is configured to propel the marine vessel in the deployed position. The method further includes rotating the propeller so as to fit between sides of the base coupled to the marine vessel when the propulsor is in the stowed position.

A method for operating a propulsion device having a propulsor with a propeller, the propulsion device having a base coupled to a marine vessel and being configured to propel the marine vessel in water. The method includes moving the propulsor from a deployed position towards a stowed position, where the propulsor is closer to the marine vessel in the stowed position than in the deployed position, and where the propulsor is configured to propel the marine vessel in the deployed position. The method further includes rotating the propeller so as to fit between sides of the base coupled to the marine vessel when the propulsor is in the stowed position.

A self-contained battery assembly is provided that is configured to be removably coupled to a watercraft. The battery assembly comprises a waterproof housing including a top portion and a bottom portion that houses a plurality of battery modules. The battery assembly includes a plurality of battery separators manufactured from a material to provide passive protection against thermal event propagation and an electronics module. Each of the battery modules is surrounded on four sides by the one or more of the plurality of battery separators. The plurality of battery separators are disposed within the housing and in physical contact with the top portion and the bottom portion.

A self-contained battery assembly is provided that is configured to be removably coupled to a watercraft. The battery assembly comprises a waterproof housing including a top portion and a bottom portion that houses a plurality of battery modules. The battery assembly includes a plurality of battery separators manufactured from a material to provide passive protection against thermal event propagation and an electronics module. Each of the battery modules is surrounded on four sides by the one or more of the plurality of battery separators. The plurality of battery separators are disposed within the housing and in physical contact with the top portion and the bottom portion.

An underwater propulsion unit is provided for an outboard motor or a pod drive. The underwater propulsion unit includes a plastic housing designed for water to flow around, and a metal housing in which an electrical drive is received. The electrical drive is received in the metal housing so as to be sealed off from the surroundings in a watertight manner, and the metal housing is arranged inside the plastic housing.

An underwater propulsion unit is provided for an outboard motor or a pod drive. The underwater propulsion unit includes a plastic housing designed for water to flow around, and a metal housing in which an electrical drive is received. The electrical drive is received in the metal housing so as to be sealed off from the surroundings in a watertight manner, and the metal housing is arranged inside the plastic housing.

Example steering control systems and methods for multiple devices are provided herein. A system includes a trolling motor assembly having a propulsion motor and a steering actuator and a sonar assembly comprising a transducer assembly and a directional actuator. The system further includes a user input assembly that is configured to detect user activity related to controlling operation of the trolling motor assembly and operation of the sonar assembly. The system further includes a processor that is configured to determine a direction of turn based on user activity, generate an electrical turning input signal indicating the direction of turn, and direct either one or both of the steering actuator and the directional actuator, via the turning input signal, to adjust a direction of either one or both of the propulsion motor and the transducer assembly accordingly.

Systems, assemblies, and methods for operating a marine motor are provided herein. An example motor system includes a motor, a battery, and a processor. The processor is configured to receive a user input indicating a desired speed, determine a charge level of the battery, determine an optimized speed or propulsion of the marine motor based on the desired speed and the determined charge level of the battery, and transmit a signal to the motor to operate accordingly. The processor may generate a correction factor based on at least one of the determined charge level of the battery, a boat speed profile curve, and a boat travel distance curve; and determine the optimized speed or propulsion by applying the correction factor to the desired speed. Thus, an eco-mode can be provided to help maintain a high level of battery charge while still enabling desired use.

Systems, assemblies, and methods for operating a marine motor are provided herein. An example motor system includes a motor, a battery, and a processor. The processor is configured to receive a user input indicating a desired speed, determine a charge level of the battery, determine an optimized speed or propulsion of the marine motor based on the desired speed and the determined charge level of the battery, and transmit a signal to the motor to operate accordingly. The processor may generate a correction factor based on at least one of the determined charge level of the battery, a boat speed profile curve, and a boat travel distance curve; and determine the optimized speed or propulsion by applying the correction factor to the desired speed. Thus, an eco-mode can be provided to help maintain a high level of battery charge while still enabling desired use.