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| Number | Title | Issue Date |
| 7798873 | Design of a flush inlet as integrated with a ship hull for waterjet propulsion The present invention's methodology for designing a fluid propulsion intake configuration of a marine vessel considers the integral geometry of the inlet together with a portion of the hull, with respect to which the inlet's entrance opening is flush. The inventive ... | 09/21/2010 |
| 7470161 | Lifting body water jet propulsion inlet inductor A foil shaped lifting body is attached by means of a strut to the underwater body of a vessel in such a manner as to cause a standing wave to be developed when the vessel is in operation in order that the standing wave will induct water into machinery intakes. The t... | 12/30/2008 |
| 7422498 | Ship with wave engulfing enhanced propulsors Presented is a way to reduce the wave drag of high speed ships by ingesting wave energy into water propulsors disposed at the bow and/or on the sides of the main hull of the ship. A forward secondary bow disposed at a lower portion of the main bow of the ship is an ... | 09/09/2008 |
| 7377826 | Fouling removal system for jet drive water intake A fouling removal system for use in a water-jet drive system is described. The fouling removal system includes a cutter arm assembly and an optional cutter stud. The cutter arm assembly includes a pivotable cutting blade located adjacent to the intake grate and arra... | 05/27/2008 |
| 7361068 | Seal pressure vent system for a waterjet apparatus A seal pressure vent system for a waterjet propulsion apparatus including a water intake section and a pumping unit. The pumping unit is designed such that in operation the seal pressure vent system provides a fluidic path for the flow of high pressure water away fr... | 04/22/2008 |
| 7357685 | Jet pump tail cone insert The present disclosure relates to a jet pump tail cone insert for a jet pump. The jet pump tail cone insert comprises a cap, a body and an end member. The end member has a plurality of projections configured to matingly receive a plurality of forks of the body. When... | 04/15/2008 |
| 7354322 | Watercraft and waterjet propulsion system The present invention relates to a watercraft with an improved waterjet propulsion system. The present invention further relates to a waterjet propulsion system with an improved steering nozzle design. The watercraft preferably is either what is known as a jet ski, ... | 04/08/2008 |
| 7258301 | Personal propulsion device The present invention provides a personal propulsion device including a body unit having a center of gravity, where the body unit includes a thrust assembly providing a main conduit in fluid communication with at least two thrust nozzles, with the thrust nozzles bei... | 08/21/2007 |
| 7252567 | Method for forming/installing intake duct in waterjet-propelled marine vessel A waterjet-propelled marine vessel having a hull with a transom and a bottom, a jet pump, and an intake duct, the improvement comprising: (1) the transom and bottom having a common opening for intake duct installation and (2) the intake duct having an intake duct up... | 08/07/2007 |
| 7241193 | Variable marine jet propulsion A variable marine jet propulsion system incorporates a motor, a variable-pitch propeller pump in a spherical housing, a variable housing and a variable inlet duct, and a microcontroller. The pump, the nozzle and the inlet are controlled by the microcontroller, which... | 07/10/2007 |
| 7238067 | Variable area pump discharge system A highly efficient watercraft propulsion system that operates continually submerged and relies on a non-circular variable area pump discharge opening which is configured, positioned and oriented so as to maximize the hydraulic reaction between the high velocity wate... | 07/03/2007 |
| 7140314 | Stand-up type personal watercraft A stand-up type personal watercraft is disclosed. The stand-up type personal watercraft typically includes a body including a hull and a deck covering the hull from above and being provided with a foot deck on an upper surface of a rear portion thereof to allow a ri... | 11/28/2006 |
| 7121220 | Steering mechanism for watercraft The invention relates to an apparatus for and method of automatically actuating the movement of a rudder of a watercraft between a steering and a non-steering position in response to the speed of the watercraft. This invention is particularly applicable for use in j... | 10/17/2006 |
| 7108569 | Axial flow pump or marine propulsion device A multistage axial-flow pumping or marine propulsion device having fixed or variable pitch stators between rotors. Stator vanes are designed to lower internal fluid speed without sacrificing total pressure as working fluid travels toward the discharge nozzle. A vari... | 09/19/2006 |
| 7052339 | Propulsion system for a fast seagoing ship, especially a naval ship The invention relates to a propulsion system for a fast seagoing ship, especially a naval ship, which comprises a propulsion system driven by at least one water jet produced by a pump assembly with an outlet nozzle for water, and a propeller jet produced by at least... | 05/30/2006 |
| 7029341 | Water jet propulsion boat having improved ride plate A water jet propulsion boat includes a pump chamber provided at a rear portion of a boat body of the boat. Further, a water jet pump is disposed in the pump chamber and a ride plate closes a bottom of the pump chamber. The ride plate includes a base fixable to the b... | 04/18/2006 |
| 7018250 | Ride plate positioning mechanism for personal watercraft, and method of using same A ride plate positioning mechanism for a personal watercraft can reduce the burden on an operator during assembly, and can also raise manufacturing productivity. In a ride plate positioning mechanism 30 of a personal watercraft 10, a portion of a botto... | 03/28/2006 |
| 7004802 | Tail cone assembly A tail cone assembly for a watercraft jet pump includes a tail cone body with a shuttle recess, a self-actuated shuttle biased into the shuttle recess, and a pump back pressure inlet orifice through the tail cone body and into the shuttle recess. The shuttle may hav... | 02/28/2006 |
| 6991499 | Waterjet propulsion apparatus A waterjet propulsion apparatus having a five blade rotor and an eight blade stator that are located within housing sections that define a water flowpath. The housing and hub are designed such that in operation a nonuniform loading arises on the rotor blades whereby... | 01/31/2006 |
| 6981902 | Marine reaction thruster A propulsion system designed to propel submarine and surface vessels by discharging fluid rearwardly with a reaction of increased force that is approximately twenty percent greater than that possible with conventional propeller systems. Its conical/tapered housing i... | 01/03/2006 |
| 6965848 | Ducting system designer A method and means for automating the design of a ducting system for a fluid is proposed. Boundary data identifying boundary conditions of the ducting system, which boundary data comprises positional information in a three dimensional installation space and magnitud... | 11/15/2005 |
| 6945833 | Fluid thrust assembly with self-aligning thrust bearings A thrust bearing assembly is described that includes a self-aligning thrust bearing used in fluid thrust assemblies where the thrust may become unevenly distributed, e.g. in a water jet propulsion unit. The thrust bearing is designed to be lubricated by water and to... | 09/20/2005 |
| 6920782 | Personal-watercraft testing apparatus Personal watercraft to be test is set in a water tank. Water flow guide plate is positioned, rearward of the stern of the watercraft, for guiding a water jet from the watercraft to make a U-turn toward a front portion of the watercraft. Vertical partition plate is p... | 07/26/2005 |
| 6884129 | Jet pump bearing assembly The present invention provides a jet pump assembly that includes a rotatable shaft adapted to be operationally coupled to a power source. An impeller is operationally connected to the rotatable shaft. A housing surrounds at least a portion of the rotatable shaft ope... | 04/26/2005 |
| 6872105 | Watercraft having a jet propulsion system with improved efficiency A watercraft, equipped with a jet propulsion system with improved efficiency of operation is disclosed. Structures are disposed within a water passage of the jet propulsion system at a position upstream of the jet propulsion unit that modulate the amount of water th... | 03/29/2005 |
| 6857920 | Variable venturi Variable venturi for use in jet propulsion systems of watercraft include discharge openings with selectively variable discharge areas that enable a venturi controller to selectively maximize top speed, acceleration, and/or fuel efficiency. The variable venturi may i... | 02/22/2005 |
| 6857919 | Impeller for marine propulsion device An impeller for a jet propulsion device includes at least one fluid channel formed on each impeller blade. During impeller rotation, a fluid back-flow is generated through the fluid channels. The back-flow advantageously sweeps cavitation bubbles away from the impel... | 02/22/2005 |
| 6855019 | Jet propulsion watercraft To provide a jet propulsion watercraft that allows a step, a vent hole, and the like to be easily provided on a bottom surface thereof. A ride plate of a jet propulsion watercraft is a member, which is formed into a substantially rectangular shape in compliance to a... | 02/15/2005 |
| 6840826 | Water jet propulsion apparatus A water jet propulsion apparatus having a duct forming a channel, an impeller disposed in the duct, a bearing of the impeller provided in the duct, and a cap closing the rear end of the bearing. In addition, at least one stream-straightening groove is formed in an e... | 01/11/2005 |
| 6776675 | Jet propulsion boat To provide a jet propulsion boat which can be efficiently propelled by disposing a steering nozzle closer to the bottom of the boat. A jet propulsion boat includes a jet propulsion apparatus driven by an engine at the stern. A jet nozzle for jetting water is provide... | 08/17/2004 |
| 6767261 | Three-dimensional vortex wake cancelling jet propulsion method An underwater propulsion system and method are more efficient and reduce vortex wake effects. A submersible has a cylindrically-shaped hull, a nose portion connected forward and a sinusoidal-shaped tapered portion aft coaxially symmetrically disposed around a longit... | 07/27/2004 |
| 6729917 | Water jet propulsion apparatus To enable a thrust force acting on an impeller shaft to be received by a sufficiently large bearing member. A water jet propulsion apparatus is provided with a stator forming a channel. An impeller is rotatably disposed in the stator. An impeller shaft is rotatably ... | 05/04/2004 |
| 6725797 | Method and apparatus for propelling a surface ship through water A method and apparatus for propelling a surface vehicle through the water comprised of a submerged portion, including both a stern propulsion unit and a bow propulsion unit. Either unit may be a pumpjet, the bow unit may include a counter-rotating nose hub having at... | 04/27/2004 |
| 6716263 | Air suction device for use in surface boat An air suction device for a surface boat having a filter element of paper type arranged in an air suction passage of an engine. The filter element is composed of a core made of a filter material and a permeable waterproof sheet arranged at the upstream side surface ... | 04/06/2004 |
| 6701862 | Bow mounted system and method for jet-propelling a submarine or torpedo through water A jet propulsion system for a submersible vehicle, such as a submarine includes a propulsion unit mounted away from the stern of the submersible. Generally, the propulsion system consists of a set of blades secured to a hub within a shroud. Combining such... | 03/09/2004 |
| 6692318 | Mixed flow pump The present invention relates to propulsion and hydraulic systems having a co-axial design wherein the inlet section, impeller section, and outlet section of a mixed flow pump system all have a common centerline axis or axis of rotation. The mixed flow pu... | 02/17/2004 |
| 6663448 | Hydraulic jet propulsion apparatus for boats A water jet propulsion unit including an intake section, a pump section having a pair of counter-rotating impellers mounted side by side on parallel driving shafts in separate cylindrical passages through the pump section and a mixing discharge section en... | 12/16/2003 |
| 6645018 | Boat propulsion device A vessel propulsion system having a suction casing (4) configured with a suction inlet (4a) opening at a vessel bottom (1b), a suction flow path (4b) inclined to rearwardly ascend from the suction inlet (4a), and an impeller chamber (4c) formed horizontal... | 11/11/2003 |
| 6575109 | Thruster screen A screen system for marine thrusters having at least one constrictor for reducing exit jet cross-sectional area to increase exit jet velocity of a thruster.... | 06/10/2003 |
| 6508188 | Drag-free hull for marine vessels A reduced drag marine vessel providing a mechanism that will reduce or even eliminate the drag along the water-solid interface at the hull of the marine vessel. This mechanism is made up of a revolving elastic shell which is similar to a donut shaped belt... | 01/21/2003 |
