Described is a hull with a transom for supporting an outboard jet motor; a tunnel disposed in a bottom surface of the hull and extending to the transom; an adapter disposed where the transom and the tunnel meet, the adapter comprising a shrouded opening for communication with the outboard jet motor at an intake of the outboard jet motor; wherein the tunnel is configured for directing a flow of water through the tunnel, into the adapter, and into the intake of the outboard jet motor. Also described is a directional device which receives the jet output of the outboard jet motor and provides a capability for making vertical or horizontal adjustments to the jet output or reversing the jet output, and a boat which includes the boat hull and directional device.

Described is a hull with a transom for supporting an outboard jet motor; a tunnel disposed in a bottom surface of the hull and extending to the transom; an adapter disposed where the transom and the tunnel meet, the adapter comprising a shrouded opening for communication with the outboard jet motor at an intake of the outboard jet motor; wherein the tunnel is configured for directing a flow of water through the tunnel, into the adapter, and into the intake of the outboard jet motor. Also described is a directional device which receives the jet output of the outboard jet motor and provides a capability for making vertical or horizontal adjustments to the jet output or reversing the jet output, and a boat which includes the boat hull and directional device.

A marine propulsion system includes a water intake guide block with a flow guide passage, a propulsion device including a housing connected to the water intake guide block and a propeller mounted in the housing, a fixed nozzle connected to the housing of the propulsion device, a swinging nozzle connected to the fixed nozzle and biasable leftward and rightward relative to the fixed nozzle, and a contra type bossing pivotally connected to the fixed nozzle and biasable up and down relative to the fixed nozzle. When rotating the propeller, water is sucked into the flow guide passage and propelled by the propeller to eject backward through the fixed nozzle, and the swinging nozzle is biased leftward/rightward to control leftward/rightward turning of the boat, and the contra type bossing is biased upward/downward to control the pitch angle of the boat and forward/backward movement of the boat.

A marine propulsion system includes a water intake guide block with a flow guide passage, a propulsion device including a housing connected to the water intake guide block and a propeller mounted in the housing, a fixed nozzle connected to the housing of the propulsion device, a swinging nozzle connected to the fixed nozzle and biasable leftward and rightward relative to the fixed nozzle, and a contra type bossing pivotally connected to the fixed nozzle and biasable up and down relative to the fixed nozzle. When rotating the propeller, water is sucked into the flow guide passage and propelled by the propeller to eject backward through the fixed nozzle, and the swinging nozzle is biased leftward/rightward to control leftward/rightward turning of the boat, and the contra type bossing is biased upward/downward to control the pitch angle of the boat and forward/backward movement of the boat.

Described is a hull with a transom for supporting an outboard jet motor; a tunnel disposed in a bottom surface of the hull and extending to the transom; an adapter disposed where the transom and the tunnel meet, the adapter comprising a shrouded opening for communication with the outboard jet motor at an intake of the outboard jet motor; wherein the tunnel is configured for directing a flow of water through the tunnel, into the adapter, and into the intake of the outboard jet motor. Also described is a directional device which receives the jet output of the outboard jet motor and provides a capability for making vertical or horizontal adjustments to the jet output or reversing the jet output, and a boat which includes the boat hull and directional device.

Described is a hull with a transom for supporting an outboard jet motor; a tunnel disposed in a bottom surface of the hull and extending to the transom; an adapter disposed where the transom and the tunnel meet, the adapter comprising a shrouded opening for communication with the outboard jet motor at an intake of the outboard jet motor; wherein the tunnel is configured for directing a flow of water through the tunnel, into the adapter, and into the intake of the outboard jet motor. Also described is a directional device which receives the jet output of the outboard jet motor and provides a capability for making vertical or horizontal adjustments to the jet output or reversing the jet output, and a boat which includes the boat hull and directional device.

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 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.