Class / Patent application number | Description | Number of patent applications / Date published |
440038000 | JET DRIVE | 89 |
20080299845 | Jet propulsion outboard and inboard motor - The present invention relates to a novel and non-obvious propulsion system for watercraft, especially, but not limited to, watercraft less than about 50 feet in length propulsion system of the present invention provides a system that is less prone to being impeded by debris, water plants and the like; less likely to cause motor stalling or motor over heating if said propulsion system does become clogged or impeded and is designed to provide increased thrust resulting in, for example, more efficient operation. | 12-04-2008 |
20080318481 | Jet pump of personal watercraft - A jet pump of a personal watercraft of the present invention includes a pump casing | 12-25-2008 |
20090042463 | Small Planing Boat - A small planing boat can include a multi-cylinder engine, and a propulsion unit driven by the engine, such as a jet pump, for propelling a hull by drawing up and jetting out water. The engine can be configured to change the number of deactivated cylinders in a phased manner corresponding to an engine speed when the engine speed becomes a prescribed speed or more, and can include memory devices for storing a plurality of cylinder deactivation sequence schedules for determining sequences of cylinders that are deactivated and increasing the number of deactivated cylinders in a phased manner. An operation control device configured to deactivate the cylinders of the engine in a phased manner in accordance with the cylinder deactivation sequence schedules stored in the memory devices. The operation control device shifts the cylinder deactivation sequence schedules to be read out from the memory devices to another cylinder deactivation sequence schedule corresponding to an operational state of the engine. | 02-12-2009 |
20090042464 | WATER JET PROPULSION SYSTEM - A highly efficient watercraft propulsion system that relies on a positive displacement pump to generate a water jet. The pump is fully submerged at all times and its inlet is positioned so as to cause water to be forced into the pump as the watercraft moves through the water. The pump is preferably combined with a variable area pump opening which is configured, positioned and oriented so as to maximize the hydraulic reaction between the water jet stream and the surrounding body of water. | 02-12-2009 |
20090093174 | Watercraft Propelled By a Water Jet - A watercraft propelled by a water jet includes an sealed hull portion including an upper deck and a bottom surface, an engine compartment located behind the sealed hull portion and containing a propulsion and steering system including an engine, a bladed impeller driven by the engine for inducting water and forcing the inducted water away from the craft through a directionally displaceable nozzle, and a control lever located on the upper deck including an engine throttle control and a steering control for adjusting the directionally displacement of the nozzle. | 04-09-2009 |
20090093175 | WATER JET PROPULSION BOAT - A water jet propulsion boat is constructed such that a fuel pressure detection device is free from a detection error or breakdown and a restart ability of an engine is protected against malfunction. A fuel tank is provided in a boat body of the water jet propulsion boat through vibration absorbing members. A fuel pump unit including a fuel pump is provided in the fuel tank. A fuel pressure sensor is provided in the fuel pump unit. An electric control device stops the fuel pump if the value detected by the fuel pressure sensor is out of the normal value range. Additionally, an electric control device stops operation of the fuel pump if the fall sensor detects the overturning of the boat body and if the detected value of the fuel pressure sensor is out of the normal value range. A regulator and a filter are provided to the fuel pump unit. | 04-09-2009 |
20090104824 | Pod Propulsion System With Rim-Mounted Bearings - A pod propulsion system comprises a housing defining a fluid duct and an annular drum rotatably mounted to the housing within the fluid duct. The annular drum has a drum interior and a cylindrical outer surface. The system further comprises a rotor mounted to the drum for rotation therewith, the rotor and the drum having a common axis of rotation. A bearing assembly mounted to the housing comprises a first bearing comprising a first plurality of bearing pads disposed circumferentially around the drum. Each pad has a pad bearing surface adapted to contact a first drum portion in a predetermined manner and is pivotably mounted to the housing so as to maintain contact of the pad bearing surface with the first drum portion in the predetermined manner when an orientation of the drum portion relative to the housing changes. | 04-23-2009 |
20090117789 | Engine for Driving a Watercraft Propelled by a Water Jet - A system for driving a water induction and discharge system of a watercraft propelled by a water jet includes a water impeller, an engine including a driven shaft and a first chamber for containing engine oil, a second chamber for containing engine oil, a pinion secured to the driven shaft and located in the second chamber, a gear located in the second chamber, engaged with the pinion and driveably connected to the water impeller, and a dam located in the second chamber for limiting oil flow across the dam into the oil contained in the second chamber. | 05-07-2009 |
20090117790 | WATER-JET PUMP, IMPELLER FOR THE SAME, AND BOAT INCLUDING THE SAME - A water-jet pump includes a cylindrical housing and an impeller. The impeller is disposed in the cylindrical housing and is configured to be rotated in a rotating direction. The impeller includes a shaft body and plural blades. The plural blades are provided on an outer circumference of the shaft body. A front portion of one of the plural blades overlaps a rear portion of another of the plural blades adjacent to one of the plural blades when viewed in an axial direction of the shaft body. When viewed in the axial direction, at least a part of a rear edge of the rear portion is formed obliquely with respect to a radial direction of the impeller towards the rotating direction. A cutaway portion is formed in each of the plural blades between at least a part of the rear edge and the outer circumference. | 05-07-2009 |
20090137165 | NEWTONIAN THRUST COWL ARRAY - The three-way valve allows fluid flow to be selectively directed to a run outlet, a bypass outlet or both at the same time. The three-way valve includes a flow diffuser with a primary valve seat positioned opposite a bypass valve seat. Choke points and flow restrictions, strategically positioned in the flow diffuser create a substantially flat velocity profile downstream of the bypass outlet. Larger versions of this three-way valve may be used in Vertical Takeoff and Landing (“VTOL”) aircraft. Other versions may be used in ships and other watercraft. | 05-28-2009 |
20090233499 | SYSTEM FOR MOUNTING A MARINE JET PROPULSION SYSTEM - A watercraft has a hull and a deck disposed above the hull. A ride plate is mounted below a rear portion of the hull. A jet pump assembly includes a jet pump disposed at least in part between the ride plate and the hull. A front wall is formed at least in part by the hull and disposed forwardly of the jet pump. The jet pump assembly is mounted on a top surface of the ride plate via a plurality of resilient mounts At least one sealing member forms a seal between the portion of the jet pump and the portion of the front wall. The jet pump is mounted to the watercraft only via a plurality of mounting points. The jet pump is resiliently mounted to the watercraft via each of the plurality of mounting points. | 09-17-2009 |
20090269995 | BOAT - A boat includes a connection structure that connects couplings via a transfer shaft on a rear end portion of a crankshaft extending rearward from an engine. The crankshaft and the transfer shaft are connected by screwing an external thread and a front internal thread, and the transfer shaft and the couplings are connected by screwing an external thread and an internal thread. There are provided an inner bolt that strengthens the connection between the external thread and the front internal thread, an end bolt that strengthens the connection between the transfer shaft and the couplings, and an outer nut that strengthens the connection between the crankshaft and the transfer shaft. The boat can prevent movement between the crankshaft and an intermediate member and between the intermediate member and a coupling both in a rotational direction and in an axial direction without causing an increase of processing time or processing cost. | 10-29-2009 |
20100075551 | WATER JET PROPULSION WATERCRAFT - A water jet propulsion watercraft includes a main engine body, a rotor chamber disposed at a rear portion of the main engine body, a crankshaft disposed so as to extend penetratingly through the rotor chamber such that a rear end portion thereof protrudes to an outer side of the rotor chamber, a rotor unit coupled to the crankshaft inside the rotor chamber, a drive shaft connected to the rear end portion of the crankshaft and rotated together with the crankshaft, and a jet propulsion unit, having an impeller that is coupled to the drive shaft, and arranged to suck in and jet out water. The crankshaft includes a flange portion that is integral with the crankshaft inside the rotor chamber. The rotor unit is fixed to the flange portion. | 03-25-2010 |
20100081347 | WATER JET PROPULSION WATERCRAFT - A water jet propulsion watercraft includes, a main engine body, a rotor chamber provided at a rear portion of the main engine body, a crankshaft arranged such that a rear end portion of the crankshaft is disposed in the rotor chamber, the rear end portion having a first connection portion, an output shaft having a second connection portion at a front end of the output shaft, the second connection portion arranged to be connected to the first connection portion of the crankshaft such that the output shaft rotates together with the crankshaft about a rotational center axis of the crankshaft, a rotor unit housed in the rotor chamber and fixed to the output shaft, a fastening member arranged to fasten the first connection portion and the second connection portion, a drive shaft connected to a rear end portion of the output shaft and arranged to be rotated together with the output shaft, and a jet propulsion unit, having an impeller that is coupled to the drive shaft and arranged to suck in and jet out water. A fastening axis of the fastening member differs from the rotational center axis. | 04-01-2010 |
20100105260 | Waterjet Unit Impeller - A variable rating impeller ( | 04-29-2010 |
20100248563 | WATER JET PROPULSION WATERCRAFT - A water jet propulsion watercraft includes a hull, an engine, a jet propulsion device, an exhaust channel, and an engine control unit. The engine includes a combustion chamber arranged to combust fuel therein, an exhaust port arranged to discharge exhaust gas after the combustion of the fuel in the combustion chamber, an exhaust valve arranged to open and close the exhaust port, an intake port arranged to pass air and the fuel into the combustion chamber, and an intake valve arranged to open and close the intake port. The jet propulsion device is arranged to be driven by the engine and to draw in water from around the hull and then jet the water. The exhaust channel is connected to the exhaust port of the engine and provides a channel through which the exhaust gas, discharged from the exhaust port, flows. The engine control unit is arranged to control the engine such that at least one location in a path leading from the exhaust channel to the intake port is blocked when the engine is stopped. | 09-30-2010 |
20100267295 | SHIP PROPULSION SYSTEM HAVING A PUMP JET - The invention relates to a ship propulsion system (S) having a pump jet (P) comprising a pump housing (G) and a drive motor, wherein the drive motor is a solenoid motor (M) integrated into the pump housing (G). | 10-21-2010 |
20110045717 | Method For System For A Water Jet Propulsion System For A Ship - A system and method of starting a water jet propulsion system for a ship in which the propulsion system includes a stator shell adapted to be mounted to the hull and having a nozzle ending in an outlet with a cross-sectional outlet area, an impeller housing attached to the stator shell and having an upstream inlet, and an impeller rotatably mounted in the impeller housing for receiving water from the inlet and discharging it through the nozzle of the stator shell so as to create a water jet upon rotation of the impeller. The method includes reducing the outlet area by partly closing the nozzle during a start up phase of the water jet propulsion system, wherein there is provided a back flow hindering arrangement arranged to hinder air to enter into the impeller housing via the nozzle. | 02-24-2011 |
20110053439 | PUMP JET ASSEMBLY AND RELATED ADAPTER SYSTEM AND METHOD - A pump jet assembly includes universal components, such as a rotor, shroud and stator, that can accommodate all marine drives within a given range and adapter components, that accommodate the difference between the universal components and a particular marine drive within the range. A pump jet adapter system includes both the universal components and a plurality of adapter components, and is made by assessing a variation in parameters for the range of marine drives and determining rotor parameters to allow use of a universal rotor for all the range of marine drives. Parameters for adapter components are determined to correspond to different marine drives within the range. | 03-03-2011 |
20110092113 | ROTARY ENGINE JET BOAT - A boat includes a hull, an inboard rotary engine, and a jet propulsion unit connected to the engine via a direct drive connection. The hull may be a stepped hull with one or more aft steps. A large, low, substantially flat aft fishing/swim deck is disposed above the engine and an exhaust system of the engine. The exhaust system may vent into the step of the stepped hull and include a check valve that discourages water from backflowing into the engine. | 04-21-2011 |
20110223817 | RUDDER ASSEMBLY FOR A WATERCRAFT HAVING A JET-DRIVE OUTBOARD MOTOR - A rudder assembly for use with a jet drive motor for a watercraft. The rudder assembly has at least one support member and at least one steering stabilizer member which extend from the at least one support member. The at least one steering stabilizer member has a longitudinal axes which extends in a direction which is essentially parallel to a longitudinal axis of the motor and essentially perpendicular to a longitudinal axis of the at least one support member. The at least one steering stabilizer member having sufficient surface area to cooperate with water when the watercraft is travelling at slow speeds, wherein the rudder assembly provides an operator of the watercraft with improved steering control and response at low speeds. | 09-15-2011 |
20120083174 | Water jet based underwater thruster - The thruster pod that is made of a pump plate; a valve plate affixed to the pump plate, and a diaphragm mounted between the pump plate and the valve plate. The pump plate has juxtaposed pressure cavity and outlet cavity, and a partition separating the pressure cavity from the outlet cavity. The pressure cavity communicates with a source of water under pressure and the outlet cavity communicates with an outlet port. The valve plate has a control chamber facing the juxtaposed pressure and outlet cavities. The diaphragm is mounted between the juxtaposed pressure and outlet cavities and the control chamber for movement between a first position and a second position upon a change in pressure in the control chamber. A control valve is mounted in the valve plate for selectively changing a pressure in the control chamber and operating a diaphragm valve. | 04-05-2012 |
20120142236 | WATERCRAFT - There is described a watercraft ( | 06-07-2012 |
20120164896 | VESSEL - A vessel includes a body including a hull and a deck, a float disposed on both right and left sides of the hull and extending in the front/rear direction along the hull, a propulsion unit that propels the vessel, a steering handle disposed above the deck, and a seat disposed at the rear of the steering handle on the deck. The deck includes a flat portion extending from the lateral side of the seat to the rear end edge of the deck. | 06-28-2012 |
20120214364 | Ring boost propulsor - The Propulsor includes a tubular oval ring and a duct assembly with their pumps, a nozzle ejector with a thrust impeller, a hydraulic pipe-connector with its valve-adjuster, a spring piston valve unit, and devices of motor vessels' hydraulic infrastructure. | 08-23-2012 |
20120214365 | WATER JET PROPULSION WATERCRAFT - A water jet propulsion watercraft includes a first exhaust pipe that is fixed to an engine and connected to an exhaust port of the engine. A damper section reduces vibrations from the engine. A catalytic converter unit is connected to the first exhaust pipe. The catalytic converter unit is attached to the engine through the damper section. A second exhaust pipe includes a first flexible pipe having a flexible quality and is connected to the catalytic converter unit. A water lock is fixed to a hull of the watercraft and connected to the second exhaust pipe. | 08-23-2012 |
20120289103 | Unmanned Underwater Vehicle - An hybrid unmanned underwater vehicle comprises a body housing a controller; a vector thruster for propelling the body; deployable wings allowing the unmanned underwater vehicle to traverse by gliding as the unmanned underwater vehicle ascends and descends; a center-of-mass shifter for shifting a center-of-mass of the vehicle to allow the unmanned underwater vehicle to pitch up and pitch down; and one of a multi-stage buoyancy control system within the body and configured to adjust an apparent displacement of the unmanned underwater vehicle and an expandable outer shell configured to adjust an apparent displacement and therefore a buoyancy of the unmanned underwater vehicle. | 11-15-2012 |
20130012081 | WATER JET PROPULSION WATERCRAFT - A water jet propulsion watercraft includes an exhaust passage, a catalyst member, a water lock, a first oxygen sensor, and a second oxygen sensor. The exhaust passage guides exhaust gas from an engine to an exterior of a hull of the watercraft. The catalyst member is arranged inside the exhaust passage. The water lock is arranged in the exhaust passage downstream of the catalyst member. The first oxygen sensor is arranged in the exhaust passage upstream of the catalyst member. The second oxygen sensor is arranged in the exhaust passage at a position downstream of the catalyst member and upstream of the water lock. | 01-10-2013 |
20130023167 | WATER JET PROPULSION WATERCRAFT - A water jet propulsion watercraft includes a hull having a sealed engine room, an engine installed in the engine room, a jet propulsion unit arranged to be driven by the engine so as to suck in water from around the hull and jet the water, a saddle type seat disposed above the engine room, a first exhaust pipe, an exhaust pipe cooling unit, and a catalyst unit. The first exhaust pipe is attached to a side of the engine inside the engine room, extends rearward from the side of the engine, and is arranged to guide exhaust gas discharged from the engine. The exhaust pipe cooling unit is arranged to cool the first exhaust pipe. The catalyst unit is connected to the first exhaust pipe, is disposed inside the engine room so as to oppose a rear surface of the engine, and is arranged to promote reaction of components contained in the exhaust gas. | 01-24-2013 |
20130102208 | WATERCRAFT - Watercraft that consists of a mid section with a seat and two side sections, and which has a steering mechanism, whereby the watercraft consists of a front part and a rear part that are coupled together by a hinged coupling, whereby the front part is formed by the mid section, and the side sections form part of the rear part, whereby the hinged coupling forms part of the steering mechanism, such that as a result of a rotation of the front part with respect to the rear part of the watercraft around the hinged coupling, the sailing direction of the watercraft is changed. | 04-25-2013 |
20140017962 | CATAMARAN VESSEL WITH HYBRID PROPULSION FOR EMBARKING AND DISEMBARKING LOADS - A catamaran vessel with hybrid propulsion engines for driving propeller propulsors and pump-jet propulsors. The vessel includes two side hulls and a mobile platform that can be moved between upper and lower positions relative to the side hulls to accommodate navigation conditions. The engines are selectively coupled to the propeller propulsors, the pump jet propulsors, and control mechanisms changing the position of the mobile platform-between the upper and lower positions. | 01-16-2014 |
20140248810 | WATER JET PROPULSION WATERCRAFT - A water jet propulsion watercraft includes a hull having a sealed engine room, an engine installed in the engine room, a jet propulsion unit arranged to be driven by the engine so as to suck in water from around the hull and jet the water, a saddle type seat disposed above the engine room, a first exhaust pipe, an exhaust pipe cooling unit, and a catalyst unit. The first exhaust pipe is attached to a side of the engine inside the engine room, extends rearward from the side of the engine, and is arranged to guide exhaust gas discharged from the engine. The exhaust pipe cooling unit is arranged to cool the first exhaust pipe. The catalyst unit is connected to the first exhaust pipe, is disposed inside the engine room so as to oppose a rear surface of the engine, and is arranged to promote reaction of components contained in the exhaust gas. | 09-04-2014 |
20140273672 | SWIMMING AID APPARATUS WORN ON THE BODY - The present invention relates to a swimming aid apparatus worn on the body. The swimming aid apparatus worn on the body according to the present invention is worn by the user to provide propulsive force so that the user can enjoy swimming. Also, a water jet propeller may be used and stably operated without breaking down or being damaged by underwater living organisms or foreign substances. The swimming aid apparatus worn on the body according to the present invention includes: a body frame worn on the user's body; a water jet propeller fixed to the body frame to spray water, thereby generating propulsive force; a battery connected to the water jet propeller to supply power; and a controller controlling the operation of the water jet propeller. | 09-18-2014 |
20150140878 | WATERCRAFT - A watercraft, including; a mid section ( | 05-21-2015 |
20150291263 | FRAME OF A WATER-JET PROPULSION UNIT FOR A BOAT, A WATER JET PROPULSION UNIT AND AN ARRANGEMENT IN A BOAT - A frame of a water jet propulsion unit arranged to be installed and sealed into an installation opening of a boat. The water-jet propulsion unit includes an impeller and the boat has a counter-sealing surface to which the frame is attached. The frame includes a flow channel to guide water to the impeller. The flow channel has a top with a maintenance opening. The maintenance opening is positioned to permit servicing the impeller. A first sealing surface forms a first closed loop to attach the water-jet propulsion unit tightly to the counter-sealing surface of the boat. A second sealing surface forms a second closed loop arranged to attach the water-jet propulsion unit to the boat. The first and second closed loops permit the maintenance opening of the frame to be alternatively locatable respectively outside or inside the stern of the boat in dependence on alternative configurations of the installation opening of the boat. | 10-15-2015 |
20160031538 | JET PROPELLED WATERCRAFT - A jet propelled watercraft includes a front stopper that is disposed between a hull and an engine, that faces the hull across a space therebetween in an up-down direction, and that is made of an elastic material. The engine includes a crankshaft rotatable around a crankshaft axis, a crankcase that houses the crankshaft, a case cover attached to the crankcase, and a stopper attachment portion that is integral and unitary with the case cover and to which the front stopper is attached. | 02-04-2016 |
20160031539 | JET PROPELLED WATERCRAFT - A jet propelled watercraft includes a watercraft body, an engine in the watercraft body, a jet pump configured to generate a jet thrust by a driving force of the engine, an intake pipe configured to supply air to the engine, an air intake box, and a filter. The air intake box includes a connecting port connected to the intake pipe and an inlet configured to take in ambient air. The filter is disposed in a space in an internal space of the air intake box. The filter divides the space into a lower region and an upper region. The lower region is connected to the inlet and the upper region is located higher than the lower region and connected to the connecting port. The filter is configured to clean air taken into the internal space from the inlet and directed to the connecting port. | 02-04-2016 |
20160114874 | WaterCraft Propulsion System and Method of Propelling a WaterCraft Through Water - A watercraft propulsion system includes a motor mounted in a container in a water-tight manner. A shaft extends from the motor through the bottom of the container to an impeller disposed in a housing outside the container. The impeller draws fluid into the housing through and opening on the back of the housing to propel a watercraft through the water. | 04-28-2016 |
20160194067 | JET BOAT | 07-07-2016 |
20190144075 | JET BOAT | 05-16-2019 |
440039000 | Auxiliary use of propulsive fluid | 4 |
20120252286 | WATER JET PROPULSION DEVICE - A water jet propulsion device | 10-04-2012 |
20120282826 | MULTI-AXIS WATER JET PROPULSION USING COANDA EFFECT VALVES - A propulsion system is provided that includes one or more pumps that form a jet for propulsion. A number of Coanda jet devices (CJDs) are coupled to the one or more pumps. The CJDs are arranged so to allow for a multi-axis underwater control of an underwater robot. | 11-08-2012 |
20130203306 | Motorized Water Vehicle Adapted for Supplying a Pressurized Fluid and Associated System - The invention relates to a Motorized Water Vehicle (MWV) adapted so as to operate as a fluid-compression station in addition to the primary transport function thereof. Such an MWV can thus supply compressed fluid to a third device. In a preferred and non-exhaustive manner, such an MWV can supply a passenger propulsion device allowing the latter to move through the air or through a fluid. The invention thus preferably relates to a propulsion system in which a remote station is a motorized water vehicle adapted such as to engage with a propulsion device. | 08-08-2013 |
20160114878 | CONTROL SYSTEMS FOR PERSONAL PROPULSION DEVICES - A personal propulsion device for use with a pressurized fluid source having a throttle, the personal propulsion device including a passenger assembly; one or more fluid discharge ports coupled to the passenger assembly and operable to elevate the passenger assembly and a passenger into the air; a fluid delivery conduit in fluid communication with the one or more fluid discharge ports; a first inductance coil coupled to the fluid delivery conduit; a second inductance coil coupled to the fluid delivery conduit and rotatable with respect to the first inductance coil; and a throttle controller coupled to the passenger assembly, where the throttle controller is configured to transmit a signal across the first and second inductance coils to the pressurized fluid source. | 04-28-2016 |
440040000 | Direction control for fluid jet | 29 |
20090124144 | System for Steering and Maneuvering a Watercraft Propelled by a Water Jet - A system for steering a watercraft propelled by a water jet includes a control lever supported to pivot rightward and leftward about a first axis, a nozzle supported on the watercraft to pivot rightward and leftward and through which water is discharged from the watercraft, first and second cables, and a steering module interconnected by the cables to the control lever and connected to the nozzle, supported to pivot laterally about a second axis and to pivot the nozzle laterally in response to pivoting of the control lever about the first axis. | 05-14-2009 |
20090325430 | MECHANICAL FLUID DYNAMIC DEVICE FOR THE PROPULSION AND FLOW CONTROL IN THE WATER-JET PROPELLED BOATS - The device includes conveying ducts of the fluid ( | 12-31-2009 |
20100330854 | JET PROPULSION DEVICE - A jet propulsion device and method for controlling movement of the jet propulsion device, where liquid inlets are positioned at a distance from the surface of the device. Preferably, the inlets are positioned in the stabilizing fins of the device. When the device reaches a certain speed, a Riabouchinsky cavity forms around the device, and the radius of the Riabouchinsky cavity is substantially equal to the distance between the inlets and the longitudinal axis of the device. | 12-30-2010 |
20110275257 | Jet drive system powered by a 4-cycle engine to propel shallow water boats - One embodiment of a boat or watercraft that is fitted with a jet drive system powered by a 4-cycle engine and positioned in such a way that will enable the boat to be propelled and maneuvered in extremely shallow water and launched for use by a minimum of one person. | 11-10-2011 |
20120282827 | BOAT STEERING ARRANGEMENT - A boat is provided with a steering arrangement comprising a main steering system and control-surface subsystem. The control-surface subsystem comprises a control-surface assembly attached to the stern of the boat and comprising a trim tab pivotally connected to the stern of the boat, and a skeg rotatably mounted by the trim tab. The control-surface assembly further comprises a trim-tab operating arrangement for pivoting the trim tab, and a skeg operating arrangement. The main steering system and the skeg operating arrangement can be selectively set to operate independently of each other, or in coordination with each other, in steering the boat. | 11-08-2012 |
20120295500 | FORWARD-REVERSE SWITCHING DEVICE OF JET-PROPULSION WATERCRAFT - A device according to an embodiment includes a base member, a slide member movable longitudinally relative to the base member, and a locking member disposed on the slide member. When the slide member moves in a first direction, an arm member rotates in a first direction, whereupon a bucket is caused to ascend by a force transmission member. When the slide member moves in a second direction, the arm member rotates in a second direction, whereupon the bucket descends. When the slide member moves to a neutral position, the bucket is brought to a neutral state. In the neutral state, a fixed protrusion is fitted into a neutral locking groove portion, thereby locking the slide member, and an indicator is located corresponding to an opening, thereby indicating the neutral state. | 11-22-2012 |
20130040513 | HYDRAULIC PROPELLER ENHANCEMENT METHOD - The present invention relates to a hydraulic propeller enhancement method for enhancing the propelling force of a hydraulic propeller. The present invention uses a gas release outlet in the propeller at the area where the high-speed axial flow of water passes for guiding in a gas by means of a negative pressure subject to Bernoulli's principle. Thus, subject to Bernoulli's principle, gas compressible characteristic and Boyle's law and the arrangement of the contracted end piece of the nozzle to work as an air compressor for compressing air bubbles, the invention uses one single gas guide device and a negative pressure suction force to guide in air bubbles to enhance the propelling force of the hydraulic propeller. | 02-14-2013 |
20130157530 | SYSTEM FOR REVERSING A HIGH MASS/LOW-PRESSURE LIQUID PROPULSION DEVICE - A high mass/low pressure liquid propulsion device which includes: —two counter-rotating impellers mounted inside a housing; —an inlet which in use allows inflow of liquid into the housing on a first side of said impellers; an outlet which in use allows outflow of liquid from the housing on a second side of said impellers opposite to said first side; —means for driving said impellers; —wherein the improvement comprises the provision of means for reversing the drive to said impellers, such that the direction of flow of liquid through the device is reversed and liquid enters the device through said outlet, passes through said impellers, and leaves the device through said inlet. | 06-20-2013 |
20140099845 | JET PROPULSION BOAT - A jet propulsion boat includes a boat body, a handle bar, an engine, a jet propulsion mechanism, a reverse gate, and a shift operating device. The handle bar is attached to the boat body. The handle bar extends in a width direction of the boat body. The engine is housed in the boat body. The jet propulsion mechanism is configured to generate a propulsion power from a drive power of the engine. The reverse gate is located rearward of the jet propulsion mechanism. The reverse gate is configured to move so as to change a direction of a jet flow from the jet propulsion mechanism. The shift operating device is rotatably attached to the handle bar about a shaft center parallel or substantially parallel to a center line of the handle bar. The shift operating device is configured to rotate so as to switch a position of the reverse gate. | 04-10-2014 |
20140235120 | SPLIT OUTER HULL HYDROPLANING VESSEL WITH A REACTIVE SUSPENSION AND INTEGRATED BRAKING AND STEERING SYSTEM - A hydroplaning vessel that exceed speeds of 25 miles per hour with several stability and handling design improvements. It has an enhanced reactive suspension and inner hull lift system positioned in the vessel between an inner hull and a set of outer hulls. There are at least three outer hulls; a front outer hull and a mirror image pair of rear outer hulls, none of which can float on its own and all which have open transoms. Steering and braking are accomplished by a set of rear elevon flaps. The drive unit resides in the inner hull and is connected by an annular drive transmission, which is connected to the jet or prop drive, which resides on the outer hull. | 08-21-2014 |
20150050847 | Modular Personal Watercraft - Personal watercraft and watercraft power systems that include a power pod for supporting a power plant and a propulsion unit. An engine or an electric motor and a pump assembly are enclosed in the power pod. One or more sponsons removably cooperate with the power pod via a mechanical interface, such as dovetail joints and/or interlocking channels, formed between the power pod and the respective sponsons. A plurality of tool-lessly operable mechanical interfaces, locking mechanism(s), and fluid or electrical signal connectors allow the sponson(s) to be selectively secured to the power pod such that the resultant watercraft is modular and transportable by a single person when necessary. | 02-19-2015 |
20160039505 | JET PROPELLED WATERCRAFT - A jet propelled watercraft includes a prime mover, a jet pump driven by the prime mover and jetting water from a jet port, a reverse gate changing a direction of the jet flow jetted from the jet pump, a shift actuator capable of moving the reverse gate to a plurality of shift positions, a reverse gate operator configured to set a position of the reverse gate, and a controller configured or programmed to prohibit startup of the prime mover when it is determined that the reverse gate operator is being operated. | 02-11-2016 |
440041000 | With bucket or clamshell-type reversing means | 11 |
20090203270 | REVERSE MECHANISM FOR A JET SYSTEM - A jet propulsion system includes an inlet receiving a fluid, and a housing defining a discharge nozzle through which fluid is discharged to provide propulsion of a vehicle in a first direction. The jet propulsion system also includes a reverse mechanism movable between a deployed position redirecting fluid from the discharge nozzle toward the first direction and providing propulsion of the vehicle in a second direction substantially opposite the first direction and a non-deployed position allowing fluid to exit the discharge nozzle and provide propulsion of the vehicle in the first direction. The reverse mechanism produces a flow entrainment that enhances forward thrust while the reverse mechanism is in the non-deployed position which results in a net thrust gain over the thrust attributed to the discharge nozzle alone. | 08-13-2009 |
20090269996 | REVERSE GATE FOR JET PROPELLED WATERCRAFT - A watercraft has a hull, a deck, an engine, a steering assembly, a jet pump, a venturi, a steering nozzle, and a reverse gate pivotable between a fully stowed position and a fully lowered position. The reverse gate includes a reverse gate body having inner and outer arcuate surfaces, and reverse gate upper and lower edges. First and second side walls are connected to the sides of the reverse gate body. At least one deflector is connected to at least one of the outer arcuate surface, the first side wall, and the second side wall. The at least one deflector is spaced from the outer arcuate surface. A deflector trailing edge is disposed upwardly and rearwardly from a deflector leading edge at least when the reverse gate is in the fully lowered position. Water deflecting surfaces and turning deflectors connected to a reverse gate are also disclosed. | 10-29-2009 |
20100022145 | WATERCRAFT REVERSE GATE OPERATION - A method of controlling a watercraft is disclosed which comprises actuating a reverse gate operator, sensing a speed of the watercraft, controlling a thrust generated by a jet propulsion system differently depending on whether the speed of the watercraft is above or below a predetermine watercraft speed when the reverse gate operator is actuated, and moving the reverse gate to a position in which the reverse gate redirects a jet of water expelled from the jet propulsion system in response to the actuation of the reverse gate operator. A watercraft implementing the above method is also disclosed. | 01-28-2010 |
20100041286 | JET PROPULSION TRIM AND REVERSE SYSTEM - A watercraft has a jet pump and a venturi. A variable trim system (VTS) support and a reverse gate are rotationally mounted relative to the venturi. A steering nozzle is rotationally mounted to the VTS support. A rotary actuator has an output portion operatively connected to at least one of the VTS support and the reverse gate. Rotation of the output portion between a first angle and a second angle causes a rotation of the VTS support while the reverse gate remains in a stowed position relative to the steering nozzle. Rotation of the output portion between the second angle and a third angle causes a rotation of the reverse gate between the stowed position and a second position while the VTS support remains in a fixed position. A jet propulsion system and a method of operating a jet propulsion system are also disclosed. | 02-18-2010 |
20100151752 | WATER JET PROPULSION WATERCRAFT - A water jet propulsion watercraft includes a hull, an engine attached to the hull, a jet propulsion device arranged to be driven using an output of the engine and to jet water toward a rear of the hull from a jet port provided on an outer side of the hull, a bucket arranged to be disposed in a manner enabling movement between a forward drive position of not blocking the water jetted from the jet port of the jet propulsion device and a reverse drive position of blocking the water jetted from the jet port and, at the reverse drive position, to convert a jetting direction of the water jetted rearward from the jet port to a forward direction, a hydraulic cylinder arranged to be disposed in an interior of the hull and to move the bucket between the forward drive position and the reverse drive position, and an oil passage arranged to connect the engine and the hydraulic cylinder and to cause a lubricating oil inside of the engine to pass through as a hydraulic oil of the hydraulic cylinder. | 06-17-2010 |
20110159752 | WATER JET PROPULSION WATERCRAFT - A water jet propulsion watercraft includes a pair of jet propulsion devices arranged right and left of a hull centerline. Each jet propulsion device includes a jetting unit arranged to jet water, a deflector supported on the hull and arranged to rotate to right and left, the deflector including a forward drive jet port and a reverse drive jet port. Each jet propulsion device includes a bucket arranged to change between a forward drive position and a reverse drive position. The bucket includes a reflecting surface arranged to reflect the water jetted from the forward drive jet port when the bucket is at the reverse drive position, and an auxiliary nozzle including an entrance opened to the reflecting surface and arranged to jet water introduced into the entrance along a hull right/left direction. The entrance of the auxiliary nozzle is spaced away from the forward drive jet port in the hull right/left direction and does not oppose the forward drive jet port in a state where the bucket is arranged at the reverse drive position and the deflector is arranged at the straight drive position. | 06-30-2011 |
20120021659 | MARINE VESSEL PROPULSION DEVICE AND MARINE VESSEL INCLUDING THE SAME - A marine vessel propulsion device includes an engine, a jet propulsion unit, and a reverse gate. The jet propulsion unit includes a jet port arranged to jet water toward a rear of a hull. The reverse gate is arranged to be capable of being changed in opening degree between a fully closed position of covering an entirety of the jet port and a fully opened position of not covering the jet port at all. The reverse gate is arranged to be moved, between the fully closed position and the fully opened position, to a first partially closed position of only partially covering the jet port and a second partially closed position of only partially covering the jet port and being closer to the fully opened position than the first partially closed position. | 01-26-2012 |
20120021660 | Electronically assisted reverse gate system for a jet propulsion watercraft - An automatic trim system for a jet propulsion watercraft is provided. Control electronics are in communication with a steering angle sensor to monitor the steering angle of the watercraft, and evaluate a target setting for the trim taking the steering angle into consideration. Control signals are sent to an appropriate actuating device for adjusting the trim angle accordingly. | 01-26-2012 |
20120088416 | METHOD AND APPARATUS FOR CONTROLLING A WATERJET-DRIVEN MARINE VESSEL - A system for controlling a marine vessel having first and second steering nozzles and corresponding first and second reversing buckets, comprises a processor configured to receive a first vessel control signal including at least a component corresponding to a translational thrust command in a port direction, and that is configured to provide a set of actuator control signals coupled to and control the first and second reversing buckets. The processor is configured to provide the set of actuator control signals so as to maintain the first reversing bucket substantially in a first discrete position and the second reversing bucket substantially in a second discrete position as long as the first vessel control signal includes a component corresponding to a translational thrust command in the port direction. | 04-12-2012 |
20120276793 | VESSEL PROPULSION APPARATUS - A vessel propulsion apparatus includes a nozzle, a deflector, and a forward bucket (hereinafter referred to as “F bucket”). In a state in which the F bucket is in a closed position and the deflector is positioned at a left side, water jetted obliquely rearward to the left from the deflector is guided by the F bucket in a left guiding direction that is tilted further to the left than a direction of jetting of water from the deflector. In a state in which the F bucket is in the closed position and the deflector is positioned at a right side, water jetted obliquely rearward to the right from the deflector is guided by the F bucket in a right guiding direction that is tilted further to the right than the direction of jetting of water from the deflector. | 11-01-2012 |
20130237106 | VESSEL PROPULSION APPARATUS - A vessel propulsion apparatus includes a nozzle, a deflector, a reverse bucket, and a guide. In a state in which the reverse bucket is positioned at a closed position and the deflector is positioned at a straight drive position, the guide generates a right branch stream flowing in an obliquely forward right direction and a left branch stream flowing in an obliquely forward left direction. In a state in which the reverse bucket is positioned at the closed position and the deflector is positioned at a right side, the guide generates the left branch stream. In a state in which the reverse bucket is positioned at the closed position and the deflector is positioned at a left side, the guide generates the right branch stream. | 09-12-2013 |
440042000 | Pivoted outlet | 5 |
20090215332 | PROPULSION UNIT FOR MULTIHULL SUCH AS A CATAMARAN - The invention concerns a propulsion unit for a multihull such as a catamaran, comprising at least one turbine, seawater suction means and seawater backflow means. The invention is characterized in that said device comprises a seawater turbine directly driven by a motor inside each of the hulls ( | 08-27-2009 |
20100081348 | MARINE JET PROPULSION STEERING SYSTEM - A marine jet propulsion system has a jet pump, a venturi connected to the jet pump, and a steering nozzle rotationally mounted relative to the venturi about a first axis. The steering nozzle has a central longitudinal axis. The first axis intersects the central longitudinal axis. A first link has a first end rotationally mounted relative to the venturi about a second axis. The first link has a second end disposed generally rearwardly from the first end of the first link. A second link has a first end rotationally mounted to the first link about a third axis and a second end rotationally mounted to the steering nozzle about a fourth axis. The third axis intersects the second end of the first link. A steering arm is connected to the first link. The axes are generally parallel to each other. A watercraft having the jet propulsion system is also disclosed. | 04-01-2010 |
20140213126 | Unmanned Underwater Vehicle - An unmanned underwater vehicle (UUV) is disclosed. The UUV includes a body and a propulsion system for propelling and orienting the UUV. The propulsion system has an inlet formed in the body that facilitates fluid being drawn into the UUV from outside the body. The propulsion system also has a duct in fluid communication with the inlet. The duct is adapted to direct the fluid along a flow path. The propulsion system further includes a pump operable with the duct to increase the velocity of the fluid. In addition, the propulsion system includes a nozzle in fluid communication with the duct to receive the fluid at the increased velocity. The nozzle is supported about a side of the body and adapted to moveably redirect fluid out of the UUV. The propulsion system provides multi-axis control of the UUV. | 07-31-2014 |
20150118923 | SURFBOARD HAVING TILT CONTROL - The invention relates to a surfboard assembly that can be controlled, comprising a surfboard ( | 04-30-2015 |
20150360755 | Forward Propelled Hover Board - A forward water propelled hover board comprising a rigid board having greater length than width. The rigid board having a rear end with a high pressure water outlet nozzle and a central pipe connecting a water hose inlet, wherein the outlet nozzle when fed with a high pressure water source from the water hose inlet provides a forward thrust to the water propelled hover board. | 12-17-2015 |
440043000 | Pivoted vane | 1 |
20090023349 | Device for moving an object in relation to a fluid - The device comprises at least one flap member ( | 01-22-2009 |
440044000 | Propulsion fluid is pressurized gas | 3 |
20160046356 | Man-Overboard Rescue and Retrieval System - A man-overboard rescue and retrieval system includes a net assembly having a pair of laterally spaced apart side ropes and a plurality of net portions, each net portion being constructed of a material that floats, extends laterally between the side ropes, and is spaced apart longitudinally from an adjacent net portion. The system includes a deployment capsule defining an interior space configured to selectively receive the net assembly therein. A launching device includes a framework configured to receive the deployment member. A first compressed air canister is in fluid communication with the launching device and the deployment member and configured to apply force to the deployment member when actuated that is sufficient to propel the deployment member from the launching device. Each net portion includes a net spreader connected to a second compressed air canister for selective inflation thereof so as to spread apart the side ropes and net portions. | 02-18-2016 |
440045000 | Produced by combustion | 2 |
20110070782 | MARINE PROPULSION SYSTEM - A marine propulsion system comprising: a fuel-filled tank; an air compressor that generates compressed air; an engine that receives fuel from the tank, wherein the air compressor is powered by the engine; and at least one hot gas generator that receives compressed air from the air compressor, the hot gas generator comprising: (a) a combustion chamber having an inlet and an outlet, the compressed gas injected into the combustion chamber at the inlet, the combustion chamber adapted to produce hot gas; (b) an injection nozzle that receives fuel from the tank, the injection nozzle positioned proximate to the inlet of the combustion chamber, the injection nozzle adapted to spray the fuel into the combustion chamber; and (c) an exhaust nozzle positioned at the outlet of the combustion chamber through which the hot gas produced in the combustion chamber is discharged from the hot gas generator. | 03-24-2011 |
20120071045 | MARINE PROPULSION SYSTEM - A marine propulsion system comprising, in one embodiment: a fuel-filled tank; an air compressor that generates compressed air; an engine that receives fuel from the tank, wherein the air compressor is powered by the engine; and at least one hot gas generator that receives compressed air from the air compressor, the hot gas generator comprising: (a) a combustion chamber having an inlet and an outlet, the compressed air injected into the combustion chamber at the inlet, the combustion chamber adapted to produce hot gas; (b) an injection nozzle that receives fuel from the tank, the injection nozzle positioned proximate to the inlet of the combustion chamber, the injection nozzle adapted to spray the fuel into the combustion chamber; and (c) an exhaust Coanda nozzle positioned at the outlet of the combustion chamber through which the hot gas produced in the combustion chamber is discharged from the hot gas generator. | 03-22-2012 |
440046000 | Having means to prevent clogging | 7 |
20090061704 | Weed Cutter for a Craft Propelled by a Water Jet - A device for cutting weeds carried by water inducted into a housing includes an intake, an outlet, an impeller for pumping water from the intake to the outlet as the impeller rotates about an axis, the impeller including a blade formed with a leading edge facing the intake, and a baffle secured against movement and including a cutting edge located adjacent the leading edge when the leading edge rotates to the location of the cutting edge. | 03-05-2009 |
20090170383 | Water intake grill for personal watercraft - A water intake grill for attachment to a water intake port of a jet watercraft. The water intake grill comprising a plurality of elongate members situated in between and mounted to fore and aft mounts. The fore mount comprising a base having an angularly orientated bottom surface for receiving and attaching first ends of the elongate members and an angularly orientated top surface for optionally situating atop thereof a removable key element having an overall geometric structure substantially coinciding with the geometric configuration of a mount socket integral to a forward wall section of the water intake port. The aft mount comprising a horizontally positioned base having rearward and forward sections for optionally accepting and resting atop of each thereof at least one removable spacer and an angular edge for receiving and attaching second ends of the elongate members. Each elongate member comprising a teardrop geometric profile incorporating an outward bottom section having a general rounded appearance and a tapered top end having sides commencing from an apex and extending angularly outward therefrom toward the outward bottom section, a geometric profile of which effectively reduces the amount debris into the water intake port while allowing continued passage of water into the water intake port to yield sustained operating performance of the jet watercraft and maintain effective cooling of the combustion engine generally associated therewith. | 07-02-2009 |
20100304628 | CUTTING SYSTEM FOR FOULING REMOVAL FROM JET DRIVE WATER INTAKE - A cutting system for fouling removal systems used in water-jet drive systems is described. The cutting system includes an actuation system for facilitating movement of a cutting blade that resides outside of the water flow area for the intake of the jet drive system. The cutting system also includes one or more guide tines to restrict movement of the cutting blade away from the surface of the grate. An optional cutter stud is formed as a single structure including two members forming a single angle, one member for mounting and the other for cutting. The single-angled configuration maximizes cutting efficiency while minimizing disruption of water flow to the propulsion system. | 12-02-2010 |
20100330855 | Water intake grill for personal watercraft - A water intake grill for attachment to a water intake port associated with a jet watercraft, the water intake grill comprising a plurality of elongate members mounted to and in between fore and aft mounts. The fore mount comprising a base having an angularly orientated bottom surface for attaching first ends of the elongate members and an angularly orientated top surface for mounting atop thereof a key element having an overall geometric structure suited to fit within a mount socket integral to a forward wall section of the water intake port. The aft mount comprising a horizontally positioned base for accepting thereon at least one spacer and mounting thereto an extension support to support apart therefrom a cross support member for attaching second ends of the elongate members. Each elongate member comprising a teardrop geometric profile that effectively reduces the amount debris into the water intake port while allowing continued passage of water into the water intake port to yield sustained operating performance of the jet watercraft. | 12-30-2010 |
20110053440 | INLET GRATE FOR A WATER JET PROPULSION SYSTEM - An inlet grate for a water jet propulsion system to be used in a watercraft has a water passage having an inlet defined by a forward and a rearward area with respect to the watercraft. The inlet grate comprises a first end portion adapted to be connected to the forward area of the inlet and a second end portion adapted to be connected to the rearward area of the inlet as well as at least one elongated member extending from the first end portion toward the second end portion. The inlet grate also comprises at least one deflector having a forward end and a rearward end, the forward end being adjacent to the first end portion of the inlet grate. | 03-03-2011 |
20120178318 | Inlet Grate Cleaning System for a Water Jet Propulsion System - An inlet grate cleaning system for a water jet propulsion system to be used in a watercraft. The water jet propulsion system has a water passage, the water passage has an inlet and the inlet has a forward area and a rearward area with respect to the watercraft. The inlet grate cleaning system comprises a pump and at least one water intake fluidly connected to the pump. At least one water outlet is also fluidly connected to the pump. The pump is adapted for pumping water from the at least one water intake to the at least one water outlet to create at least one jet of water. The at least one water outlet is positioned so as to direct the at least one jet of water toward an inlet grate. | 07-12-2012 |
20130309921 | INLET GRATE FOR A WATER JET PROPULSION SYSTEM - An inlet grate for a water jet propulsion system to be used in a watercraft has a water passage having an inlet defined by a forward and a rearward area with respect to the watercraft. The inlet grate comprises a first end portion adapted to be connected to the forward area of the inlet and a second end portion adapted to be connected to the rearward area of the inlet as well as at least one elongated member extending from the first end portion toward the second end portion. The inlet grate also comprises at least one deflector having a forward end and a rearward end, the forward end being adjacent to the first end portion of the inlet grate. | 11-21-2013 |
440047000 | Having means to increase fluid drive means efficiency | 6 |
20080214066 | 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 connected together, the body and the end member have a plurality of receivers configured to receive stator vanes of a bearing hub of the jet pump. The body and the end member are configured to be proximate the stator vanes. The cap is configured to matingly couple to the body. The jet pump tail cone insert encompasses a portion of the bearing hub of the jet pump. The jet pump tail cone insert occupies within the bearing hub thereby increasing a flow rate of water through the jet pump. | 09-04-2008 |
20090088034 | WATER INTAKE GRILL FOR PERSONAL WATERCRAFT - A water intake grill for attachment to a water intake port of a jet watercraft. The water intake grill comprising a plurality of elongate members situated in between and mounted to fore and aft mounts. The fore mount comprising a base having an angularly orientated bottom surface for receiving and attaching first ends of the elongate members and an angularly orientated top surface for mounting atop thereof a singular key element having an overall geometric configuration substantially coinciding with the geometric configuration of a first inward socket integral to a forward wall section of the water intake port. The aft mount comprising a horizontally positioned base having rearward and forward sections, the rearward section having a primary key element in association with a cylindrical riser and the forward section having a secondary key element that extends across the width of the aft mount and includes an angular edge for receiving and attaching second ends of the elongate members. Each elongate member comprising a teardrop geometric profile incorporating an outward bottom section having a general rounded appearance and a tapered top end having sides commencing from an apex and extending angularly outward therefrom toward the outward bottom section, a geometric profile of which effectively reduces the amount debris into the water intake port while allowing continued passage of water into the water intake port to yield sustained operating performance of the jet watercraft and maintain effective cooling of the combustion engine generally associated therewith. | 04-02-2009 |
20090098782 | Two Phase Water Jet Propulsion for High-Speed Vehicles - A water jet propulsion apparatus having an engine producing an exhaust gas, a pump driven by the engine, a nozzle in fluid communication with the pump, and an exhaust passageway communicating between the engine and the nozzle is disclosed. The exhaust passageway is connected the nozzle at a point in the nozzle where the water flow velocity is being increased, and prior to the water being expanded. By mixing the exhaust with the water while the water flow velocity is being increased, the result is a decrease the density of the mixture and an increase the total mass flow rate, thus resulting in increased thrust. | 04-16-2009 |
20090130925 | Marine propulsor with inlet fluid inducer - Presented is a fluid propulsor for propelling a vehicle that incorporates a Coanda Effect Inducer (CEI), more commonly called an inlet fluid inducer in this application, in its inlet to induce fluids passing by the vehicle to turn uniformly toward a powered fluid energizing device such as a rotor of the propulsor. This concept enhances the efficiency of the rotor and the overall efficiency of the propulsor. The rotor is preferably at least primarily enclosed in a housing and the rotor may operate either fully submerged in liquid or in a partially liquid and partially gaseous environment. The CEI and the powered fluid energizing device are, in the preferred embodiment, installed in an inlet housing of the propulsor. Fluid flow directing devices may be incorporated to separate liquid from gas flowing to the rotor in some instances. The inlet fluid inducer may take the shape of a cylinder or any other flow directing shape and while more effective when rotating in the direction of fluid flow is also viable when not rotating. | 05-21-2009 |
20110207375 | VARIABLE DIMENSION WATER JET - A quiescently flush resilient portion of a water jet exit channel that distends under controlled fluidic pressure to narrow the flow channel to trade off power for speed in a water-jet-powered watercraft and/or to suppress impeller cavitations during standing starts. The resilient portion may be a continuous annular portion or may be segmented for thrust vectoring. The resilient portion may be built into a water jet exit channel or may be in an add-on nozzle that can be attached to the water jet exit channel, especially for aftermarket improvements. The control system, the water jet exit structure, the water jet, and the watercraft and included. A resilient ring with top and bottom radially outwardly extending flanges mounted on a rigid ring and compressed within a canister between an annular canister floor and a compressive annular cap may provide the plenum and resilient portion of the water jet exit channel. | 08-25-2011 |
20120252287 | WATER JET PROPULSION DEVICE - There is provided a water jet propulsion device | 10-04-2012 |