A computing apparatus that is integrated within a flotation module, the system obtaining the energy required to power its computing operations from waves that travel across the surface of a body of water on which the flotation module sets. Additionally, the self-powered computing apparatus employs novel designs to utilize its close proximity to the body of water and/or to strong ocean winds to significantly lower the cost and complexity of cooling their computing circuits.

A boat drive for a boat having a boat hull with a bottom. The boat drive includes an underwater pod; an electric motor disposed in the underwater pod, the electric motor driving, via a drive shaft, a propeller attached to the underwater pod; and an electrical supply line for supplying energy to the electric motor. The boat drive further includes an inner tube connected to the underwater pod and displaceably disposed in an outer tube, wherein the electrical supply line is routed through the inner tube. The boat drive further includes a mounting body attachable to the bottom of the boat hull, wherein the outer tube is passed through the mounting body. At least one annular sealing element is disposed between the inner and outer tubes, wherein the at least one annular sealing element seals the inner tube and the outer tube in a radial direction relative to the longitudinal axis of the inner tube.

A modular configuration of a workboat including a main deck. The workboat includes an engine operators station including one or more variable frequency drives and one or more switchboards to manage propulsion of the workboat. The workboat also includes one or more battery sets, wherein each of the one or more battery sets includes a plurality of batteries contained in a battery set container, wherein at least one of the one or more battery sets is coupled to one or more systems of the workboat that require energy. The battery set containers may be moved using a rail structure of the workboat below the main deck. The one or more battery set containers may be moved back and forth below the main deck for transfer in and out of the workboat.

A modular configuration of a workboat including a main deck. The workboat includes an engine operators station including one or more variable frequency drives and one or more switchboards to manage propulsion of the workboat. The workboat also includes one or more battery sets, wherein each of the one or more battery sets includes a plurality of batteries contained in a battery set container, wherein at least one of the one or more battery sets is coupled to one or more systems of the workboat that require energy. The battery set containers may be moved using a rail structure of the workboat below the main deck. The one or more battery set containers may be moved back and forth below the main deck for transfer in and out of the workboat.

An embodiment of the present invention provides a battery management system and a switching method thereof, which can prevent fusion of a relay by preventing arcing and voltage spikes when the relay is turned off (opened). To this end, the embodiment of the present invention provides a battery management system including one or more battery packs; a master battery management unit sensing voltages and/or currents of the battery packs; main relays connected between the battery packs and loads and turned on or off by the master battery management unit; and sub relays connected to the main relays in parallel, turned on or off by the master battery management unit and having resistors, wherein when switching occurs in which the main relays are turned off, the sub relays are first turned on and the main relays are then turned off.

An embodiment of the present invention provides a battery management system and a switching method thereof, which can prevent fusion of a relay by preventing arcing and voltage spikes when the relay is turned off (opened). To this end, the embodiment of the present invention provides a battery management system including one or more battery packs; a master battery management unit sensing voltages and/or currents of the battery packs; main relays connected between the battery packs and loads and turned on or off by the master battery management unit; and sub relays connected to the main relays in parallel, turned on or off by the master battery management unit and having resistors, wherein when switching occurs in which the main relays are turned off, the sub relays are first turned on and the main relays are then turned off.

A blade channel of a turbomachine that is delimited in the circumferential direction of the turbomachine by a pressure side of an airfoil and by an opposite suction side of an adjacent airfoil that, in the radial direction of the turbomachine, is delimited by two opposing side walls, and whose extent in the axial direction of the turbomachine is delimited by leading edges and by trailing edges of airfoils; at least one of the side walls being provided with localized contours, of which at least two are formed as elevations and at least two as depressions; a saddle surface being formed between the contours that, in one rotation, alternately merges into an elevation and a depression; a blade cascade having such blade channels, as well as a turbomachine having such a blade cascade.

A blade channel of a turbomachine that is delimited in the circumferential direction of the turbomachine by a pressure side of an airfoil and by an opposite suction side of an adjacent airfoil that, in the radial direction of the turbomachine, is delimited by two opposing side walls, and whose extent in the axial direction of the turbomachine is delimited by leading edges and by trailing edges of airfoils; at least one of the side walls being provided with localized contours, of which at least two are formed as elevations and at least two as depressions; a saddle surface being formed between the contours that, in one rotation, alternately merges into an elevation and a depression; a blade cascade having such blade channels, as well as a turbomachine having such a blade cascade.

A control system for a trolling motor operated based upon commands generated by a wireless remote control device and a wired foot pedal is provided. The controller is interposed between the trolling motor and the wired foot pedal to add wireless controllability to the trolling motor via the wireless remote control. The controller communicates with the remote control through a bidirectional wireless communication link to receive commands and to provide status information on the operation of the motor. The remote control includes user inputs for generating commands that are sent wirelessly to the controller to control operation of the marine device. The remote control also includes a display for displaying real time status information that is received wirelessly from the controller. The controller generates control signals upon receipt of wireless communication from the remote control that simulate signals that are normally generated by the wired foot pedal.

An engine device including: an intake manifold configured to supply air into a cylinder; an exhaust manifold configured to output exhaust gas from the cylinder; a gas injector which mixes a gaseous fuel with the air supplied from the intake manifold; and a main fuel injection valve configured to inject a liquid fuel into the cylinder for combustion. At the time of switching the operation mode from one to the other between a gas mode and a diesel mode, an instant switching to the diesel mode is executed when the engine rotation number is determined to approach the upper limit value which leads to an emergency stop of the engine device.