A self-propelling watercraft system is provided. The watercraft has a base with a plurality of sidewalls extending from the base to form a cockpit. The base also has a recess, where a pump can detachably connect to the hull within the recess. The pump has an intake valve on a first end and a nozzle on a second end that is opposite the first end. The intake valve can intake water. The nozzle can jettison water received in the pump from the intake valve and agitate water surrounding the nozzle.

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 water jet intake grate mounted to an intake opening in the hull of a watercraft includes parallel stringer blades having sharp cutting edges which span between fore and aft base plates to shred water borne debris as the debris sucked through the intake opening. The base plates are anchored to the hull at opposite ends of the intake opening. A transverse knife blade having sharp cutting edges spans across the stringer blades and the aft base plate includes a transverse sharp cutting edge, both for crosscut shredding of debris. The aft base plate includes an inboard tail blade lying in a plane parallel to the stringer blades having sharp cutting edges for shredding any residual debris.

A water jet intake grate mounted to an intake opening in the hull of a watercraft includes parallel stringer blades having sharp cutting edges which span between fore and aft base plates to shred water borne debris as the debris sucked through the intake opening. The base plates are anchored to the hull at opposite ends of the intake opening. A transverse knife blade having sharp cutting edges spans across the stringer blades and the aft base plate includes a transverse sharp cutting edge, both for crosscut shredding of debris. The aft base plate includes an inboard tail blade lying in a plane parallel to the stringer blades having sharp cutting edges for shredding any residual debris.

A mixed flow water jet pump used for propulsion in boats and other water borne craft. The jet pump may be a fixed assembly or alternatively in part comprise an intake section and flexible intake section extension allowing a trimming function and where the primary input drive shaft does not pass through the intake section of the jet pump. The jet pump drive may comprise a dual or single input drive shaft system where the dual input drive train allows for much greater power delivery to the pump while maintaining reliability. The jet pump may have a sterndrive or outboard configuration using internal combustion engines or electric motors as the primary driving means.

A mixed flow water jet pump used for propulsion in boats and other water borne craft. The jet pump may be a fixed assembly or alternatively in part comprise an intake section and flexible intake section extension allowing a trimming function and where the primary input drive shaft does not pass through the intake section of the jet pump. The jet pump drive may comprise a dual or single input drive shaft system where the dual input drive train allows for much greater power delivery to the pump while maintaining reliability. The jet pump may have a sterndrive or outboard configuration using internal combustion engines or electric motors as the primary driving means.

The present invention is a system for air supply to the engine of a motor float comprising a bottom part and an upper part of the body defining the inner space of the float, in which a combustion engine is arranged, wherein the upper part of the body is in its front part provided with an air supply, characterized in that the combustion engine is arranged in the engine compartment and separated from the rest of the inner space of the float by means of a partition provided with a suction opening in its front part, wherein to provide the circulation of air in the inner space of the float a sealing rib extends from the front part of the partition towards the tip of the float, separating the air supply and suction opening from one another, wherein at least one rear pump for sucking the leaking water is arranged in the rear part of the inner space of the float. The main object of the invention is thus to use the interspace of the float to provide separation of water and air, when eventual separated water may be sucked away by a pump operating on any principle (electric, vacuum, etc.).

The present invention is a system for air supply to the engine of a motor float comprising a bottom part and an upper part of the body defining the inner space of the float, in which a combustion engine is arranged, wherein the upper part of the body is in its front part provided with an air supply, characterized in that the combustion engine is arranged in the engine compartment and separated from the rest of the inner space of the float by means of a partition provided with a suction opening in its front part, wherein to provide the circulation of air in the inner space of the float a sealing rib extends from the front part of the partition towards the tip of the float, separating the air supply and suction opening from one another, wherein at least one rear pump for sucking the leaking water is arranged in the rear part of the inner space of the float. The main object of the invention is thus to use the interspace of the float to provide separation of water and air, when eventual separated water may be sucked away by a pump operating on any principle (electric, vacuum, etc.).

The present invention is a system for air supply to the engine of a motor float comprising a bottom part and an upper part of the body defining the inner space of the float, in which a combustion engine is arranged, wherein the upper part of the body is in its front part provided with an air supply, characterized in that the combustion engine is arranged in the engine compartment and separated from the rest of the inner space of the float by means of a partition provided with a suction opening in its front part, wherein to provide the circulation of air in the inner space of the float a sealing rib extends from the front part of the partition towards the tip of the float, separating the air supply and suction opening from one another, wherein at least one rear pump for sucking the leaking water is arranged in the rear part of the inner space of the float. The main object of the invention is thus to use the interspace of the float to provide separation of water and air, when eventual separated water may be sucked away by a pump operating on any principle (electric, vacuum, etc.).

A multipurpose maintenance tool for a mechanical assembly. The tool includes a central body and an elongated shank extending in a longitudinal direction from the central body to a lever end. A foreign object removing element has a foreign body engaging surface. The element extends from the central body generally opposite the shank. A fastener engaging formation is formed on the shank, the removing element, and/or the central body. The formation is sized and shaped for engaging a fastener on the assembly to selectively tighten and loosen the fastener. A lateral extension extends from the central body to span an opening in the assembly and engage opposite margins adjacent the opening. As the shank is pivoted about the extension, the removal surface pivots about the lateral extension in a direction corresponding to the angular direction of the shank to dislodge foreign objects from the opening in the assembly.