Abstract: A marine propeller combination for a marine propulsion unit includes a first propeller and a second propeller arranged to rotate simultaneously in opposite directions about a common rotational axis. The marine propeller combination is configured such that the first and second propellers are angularly positioned such that during one revolution one of the blades of the first propeller is aligned with a drive leg of the marine propulsion unit when a blade gap of the second propeller is aligned with the drive leg, or one of the blades of the first propeller is aligned with the drive leg when one of the blades of the second propeller is aligned with the drive leg. The disclosure further relates to a marine vessel and to a method of operating a marine propeller combination.

Abstract: A computer implemented diagnostics system for a marine propeller drive unit is provided. The diagnostics system comprising processing circuitry connected to a speed sensor system and to a control unit associated with the electric machine. The speed sensor system is arranged in connection to the differential arrangement to provide propeller speed data to the processing circuitry indicative of a speed of rotation of at least one of the propeller axles of the self-balancing propeller drive unit. The control unit is arranged to provide motor current data to the processing circuitry indicative of a motor current drawn by the electric machine. The processing circuitry is arranged to monitor the motor current data from the control unit, and the propeller speed data from the speed sensor system, and to classify a state of the self-balancing propeller drive unit into a pre-determined number of states comprising one or more fault states, based on the motor current data and on the propeller speed data.

Abstract: A computer-implemented method for maneuvering a boat provided with a single drive unit, includes: Obtaining net momentum direction data indicative of a target horizontal rotational movement of the hull, triggering a series of bursts of thrust by the drive unit, said series of bursts of thrust comprising a plurality of primary bursts and a plurality of secondary bursts directed differently than the primary bursts, The primary bursts and the secondary bursts are directed such that they provide a respective longitudinal thrust component parallel to a hull longitudinal axis. The primary bursts are directed such that the longitudinal thrust components of the primary bursts act in the opposite direction with respect to the direction of the longitudinal thrust components of the secondary bursts. The primary bursts and the secondary bursts are further directed such that they jointly provide a net momentum on the hull associated with said net momentum direction data.

Abstract: A method of controlling a propeller drive assembly attachable to a hull of a marine vessel, said propeller drive assembly comprising a propeller drive unit and a housing for attachment to a hull of the marine vessel on an inside of the hull. The housing defines an inner space and an opening through which at least a portion of the propeller drive unit is movable into and out of the inner space. The propeller drive assembly comprises a suspension mechanism attached to the housing and configured to suspend the propeller drive unit, wherein the suspension mechanism is adapted to move the propeller drive unit between a stowed position and a deployed position.

Abstract: A marine propulsion system includes wings with a hydrofoil shaped geometry arranged for mounting on opposite side sections of a vessel comprising at least one hull adjacent the transom. Each wing includes a first section extending downwards along the side of the hull and at least partially below the waterline in its operative position. Each wing includes a second section extending towards the central longitudinal axis of the hull in its operative position. The second section each wing is arranged to support at least one propulsor. The first section of each wing is mounted rotatable about a vertical axis.

Abstract: A programmable digital signal processor includes a plurality of memory units, a plurality of accelerator units and a processor core. The digital signal processor also includes a programmable network that may be configured to selectively provide connectivity between the memory units, the accelerator units, and the processor core. Each of the accelerator units may be configured to perform one or more dedicated functions. The processor core may include an execution unit that may be configured to execute instructions that are associated with datapath flow control. The programmable network may be configured to selectively provide the connectivity in response to execution of particular instructions.

Abstract: A programmable digital signal processor including a clustered SIMD microarchitecture includes a plurality of accelerator units, a processor core and a complex computing unit. Each of the accelerator units may be configured to perform one or more dedicated functions. The processor core includes an integer execution unit that may be configured to execute integer instructions. The complex computing unit may be configured to execute complex vector instructions. The complex computing unit may include a first and a second clustered execution pipeline. The first clustered execution pipeline may include one or more complex arithmetic logic unit datapaths configured to execute first complex vector instructions. The second clustered execution pipeline may include one or more complex multiplier accumulator datapaths configured to execute second complex vector instructions.