Embodiments of a jet pump system are disclosed where certain embodiments comprise an inlet component, an electronic controller which is cooled via the inflow of water through the inlet component, a combined motor impeller system positioned adjacent to the outflow aperture of the inlet component, and a nozzle pump positioned adjacent to the outflow of the motor impeller system.

A duct arrangement for an internal combustion engine comprises an exhaust duct, an inlet duct and a cooling air duct. The exhaust duct is contained within the cooling air duct for substantially its whole length and the cooling air duct is contained within the inlet duct for substantially its whole length, so that in use the cooling air duct provides a barrier to limit heat transfer between gas flowing in the exhaust duct and gas flowing in the inlet duct. The invention avoids the need for separate inlet and exhaust ducts with their attendant disadvantages. The separation of the inlet and exhaust ducts by the cooling air duct allows the inlet air to be kept as cool as possible, as is necessary for efficient engine operation.

A duct arrangement for an internal combustion engine comprises an exhaust duct, an inlet duct and a cooling air duct. The exhaust duct is contained within the cooling air duct for substantially its whole length and the cooling air duct is contained within the inlet duct for substantially its whole length, so that in use the cooling air duct provides a barrier to limit heat transfer between gas flowing in the exhaust duct and gas flowing in the inlet duct. The invention avoids the need for separate inlet and exhaust ducts with their attendant disadvantages. The separation of the inlet and exhaust ducts by the cooling air duct allows the inlet air to be kept as cool as possible, as is necessary for efficient engine operation.

The water spray cooling device for a watercraft includes at least one water sprayer that is adaptively secured to a watercraft. The one or more water sprayers are in fluidic communication with a pump via a first conduit. The pump is in fluidic communication with an intake valve via a second conduit. The intake valve is located on a hull of the watercraft in order to collect water, which is then transferred to the pump. The one or more water sprayers spray water onto an occupant of the watercraft. The one or more water sprayers are ideally located on an external surface of the watercraft in order to direct water at a driver of the watercraft.

The water spray cooling device for a watercraft includes at least one water sprayer that is adaptively secured to a watercraft. The one or more water sprayers are in fluidic communication with a pump via a first conduit. The pump is in fluidic communication with an intake valve via a second conduit. The intake valve is located on a hull of the watercraft in order to collect water, which is then transferred to the pump. The one or more water sprayers spray water onto an occupant of the watercraft. The one or more water sprayers are ideally located on an external surface of the watercraft in order to direct water at a driver of the watercraft.

The present disclosure relates to a ship's propulsion unit such as a ship's azimuthing propulsion unit. The propulsion unit can include at least one supporting metal sheet arranged between an support section of a shell structure of the propulsion unit and an cylindrical outer surface of a cylindrical section of a motor housing section of the shell structure for providing additional support for the motor housing section of the shell structure at the shell structure of the support section.

The present disclosure relates to a ship's propulsion unit such as a ship's azimuthing propulsion unit. The propulsion unit can include at least one supporting metal sheet arranged between an support section of a shell structure of the propulsion unit and an cylindrical outer surface of a cylindrical section of a motor housing section of the shell structure for providing additional support for the motor housing section of the shell structure at the shell structure of the support section.

The invention relates to a pod propulsion unit of a ship. The pod propulsion unit comprises a pod housing arranged at least partly below a hull of the ship, an electric propeller motor within a motor gondola of the pod housing, an annular gap between a rotor and a stator of the electric propeller motor, and gas channels extending through the rotor, a closed cooling gas circuit, and a fan for circulating gas in the closed cooling gas circuit. The closed cooling gas circuit comprising a feeding duct extending between the return duct and the first motor end face of the electrical propeller motor, and a return duct extending between the feeding duct and the opposite second motor end face of the electrical propeller motor.

The invention relates to a pod propulsion unit of a ship. The pod propulsion unit comprises a pod housing arranged at least partly below a hull of the ship, an electric propeller motor within a motor gondola of the pod housing, an annular gap between a rotor and a stator of the electric propeller motor, and gas channels extending through the rotor, a closed cooling gas circuit, and a fan for circulating gas in the closed cooling gas circuit. The closed cooling gas circuit comprising a feeding duct extending between the return duct and the first motor end face of the electrical propeller motor, and a return duct extending between the feeding duct and the opposite second motor end face of the electrical propeller motor.

Disclosed is a heating module and a method of manufacturing thereof. The method comprises arranging a first conductive layer on a first surface of an intermediate insulating layer; making a channel on a second surface of the intermediate insulating layer; arranging a heating cable in the channel; filling the channel with a conductive filling material to cover the heating cable arranged in the channel; and attaching a second conductive layer to the second surface of the intermediate insulating layer with a conductive adhesive coating.