A jet pump assembly includes a marine engine, a jet drive and a shield adapted to be secured to a transom of a watercraft. The shield has arms to which the marine engine is secured and legs to which the jet drive is secured, the arms and legs extending in opposite directions. The shield has a flange adapted to be secured to the transom of the watercraft. The shield covers an opening in the transom through which the jet pump assembly is passed during assembly. A gasket between the shield and transom prevents water from entering the watercraft.

A jet pump assembly includes a marine engine, a jet drive and a shield adapted to be secured to a transom of a watercraft. The shield has arms to which the marine engine is secured and legs to which the jet drive is secured, the arms and legs extending in opposite directions. The shield has a flange adapted to be secured to the transom of the watercraft. The shield covers an opening in the transom through which the jet pump assembly is passed during assembly. A gasket between the shield and transom prevents water from entering the watercraft.

A jet propulsion system includes a housing and an impeller positioned within the housing interior. A nozzle is positioned at least partially downstream of the housing outlet and a deflector gate is positioned within the nozzle interior. The deflector gate has a first end, a second end and a pivot provided at the first end. The deflector gate is pivotable relative to the nozzle about a pivot axis defined by the pivot between a default position and a deflector position. The deflector gate in the default position having the second end downstream of the first end, and in the deflector position deflecting at least some of the water out of an opening of the nozzle in an upstream direction.

A jet propulsion system includes a housing and an impeller positioned within the housing interior. A nozzle is positioned at least partially downstream of the housing outlet and a deflector gate is positioned within the nozzle interior. The deflector gate has a first end, a second end and a pivot provided at the first end. The deflector gate is pivotable relative to the nozzle about a pivot axis defined by the pivot between a default position and a deflector position. The deflector gate in the default position having the second end downstream of the first end, and in the deflector position deflecting at least some of the water out of an opening of the nozzle in an upstream direction.

A reverse bucket for a jet propulsion device includes a vertical ridge line that faces a discharge opening of a deflector to make a marine vessel move backward, a first inlet region and a second inlet region separated by the ridge line to receive water discharged from the discharge opening, first and second outlet regions to discharge the water received by the first and second inlet regions to the outside, and first and second guide regions to guide the water received by the first and second inlet regions to the first and second outlet regions. The first inlet region, the first guide region, and the first outlet region define a first recess portion including a first opening that faces the discharge opening. The second inlet region, the second guide region, and the second outlet region define a second recess portion including a second opening that faces the discharge opening.

A reverse bucket for a jet propulsion device includes a vertical ridge line that faces a discharge opening of a deflector to make a marine vessel move backward, a first inlet region and a second inlet region separated by the ridge line to receive water discharged from the discharge opening, first and second outlet regions to discharge the water received by the first and second inlet regions to the outside, and first and second guide regions to guide the water received by the first and second inlet regions to the first and second outlet regions. The first inlet region, the first guide region, and the first outlet region define a first recess portion including a first opening that faces the discharge opening. The second inlet region, the second guide region, and the second outlet region define a second recess portion including a second opening that faces the discharge opening.

A jet pump includes a propulsion system including an impeller coupled to a rotatable shaft configured to receive torque from an engine and an exhaust system including an exhaust flow path configured to direct exhaust from the engine to an exterior of the watercraft, wherein the exhaust system is integrated with the propulsion system. In another embodiment, a jet pump includes a propulsion system including a water intake configured to take in water from a body of water, the water intake including an intake grate and an intake base, and an exhaust system including an exhaust flow path configured to direct exhaust from the engine to an exterior of the watercraft, wherein the intake base of the water intake is configured to be coupled to an exterior surface of a hull of the watercraft.

A jet pump includes a propulsion system including an impeller coupled to a rotatable shaft configured to receive torque from an engine and an exhaust system including an exhaust flow path configured to direct exhaust from the engine to an exterior of the watercraft, wherein the exhaust system is integrated with the propulsion system. In another embodiment, a jet pump includes a propulsion system including a water intake configured to take in water from a body of water, the water intake including an intake grate and an intake base, and an exhaust system including an exhaust flow path configured to direct exhaust from the engine to an exterior of the watercraft, wherein the intake base of the water intake is configured to be coupled to an exterior surface of a hull of the watercraft.

A built-in propulsion system includes an engine, a diversion unit with a diversion base and an exhaust pipe, and a propulsion unit. The diversion base is connected to the engine, having a water inlet, a water outlet, a diversion channel in communication between the water inlet and the water outlet, a shaft hole above the water inlet and an exhaust chamber behind the shaft hole. The exhaust pipe is fixed on the outer periphery surface of the diversion base in communication with the exhaust chamber. The propulsion unit includes a transmission shaft inserted through the shaft hole and connected to the engine, and an impeller located in the diversion channel and connected to the transmission shaft. The exhaust pipe is used to exhaust the exhaust gas of the engine to the outside of the diversion base to avoid the interference of the exhaust gas and the water flow.

One embodiment of the invention comprises a method for controlling a marine vessel having a first steerable propulsor, a corresponding first reversing device, a second steerable propulsor and a corresponding second reversing device. The method comprises receiving a first vessel control signal corresponding to a rotational movement and no translational movement command, generating at least a first actuator control signal and a second actuator control signal in response to the first vessel control signal, coupling the first actuator control signal to and controlling the first steerable propulsor and the second steerable propulsor, and coupling the second actuator control signal to and controlling the first reversing device and to the second reversing device. The method creates rotational forces on the marine vessel with substantially no translational forces on the marine vessel.