Abstract: Provided is a heat generating arrangement and a method for generation of heat to be used in a heat consumer. The heat generating arrangement uses combustion of aluminium and hydrogen to raise the temperature of superheated steam inside the heat generating arrangement. The heat in the superheated steam can thereafter be used in a heat consumer, such as a heat exchanger.

Abstract: Propulsion device with outboard waterjet for marine vehicles, which comprises a nacelle (2) which at its interior houses a propeller (3) constituted by a pump (11) actuatable for generating a flow of fluid through the nacelle (2) according to an outflow sense (VF). The nacelle (2) comprises: a front dynamic intake (12) having passage sections substantially increasing according to the aforesaid outflow sense (VF), in a manner such to cause a slowing of the local speed of the fluid and a pressure rise; a rear discharge nozzle (14) having passage sections substantially decreasing in the outflow sense (VF) of the fluid, in a manner such to cause an increase of the local speed of the fluid and a pressure decrease, creating a propulsive thrust jet at the outlet of the discharge nozzle (14).

Abstract: The invention relates to a method for controlling a water jet propulsion device for the propulsion of a marine vessel, the water jet propulsion device comprising: a conduit extending between an inlet and an outlet; an impeller in the conduit; and a mechanical power provider arranged to deliver power to the impeller; the method comprising receiving a plurality of thrust commands, and controlling a thrust level of the water jet propulsion device in dependence the thrust commands, wherein controlling the thrust level comprises adjusting a position of a deflector arranged to deflect water flowing out of the outlet, characterised by coordinating the adjustment of the position of the deflector with a level of engagement of a clutch, arranged to adjust the delivery of power from the power provider to the impeller, so that the thrust level is substantially continuous in a thrust command domain.

Abstract: An atomizer for applying a coating includes a nozzle plate, an actuator, and an acoustic focusing device. The nozzle plate defines at least one aperture. The actuator is configured to oscillate to form pressure waves within a fluid to eject the fluid from the nozzle plate. The acoustic focusing device focuses the pressure waves toward the apertures.

Abstract: A fluid machine includes: a shaft portion; a shroud surrounding the shaft portion and including an inside surface that forms a flow path-forming surface defining a flow path with the shaft portion; a first propeller rotatably provided in the flow path; a second propeller rotatably provided on a downstream side of the first propeller in the flow path; and a motor including a rotor that is fixed to an outer circumferential portion of the second propeller and that is accommodated in the shroud, and a stator that surrounds the rotor via a clearance and that is fixed in the shroud. A portion of the flow path-forming surface on a downstream side of the second propeller decreases in diameter toward the downstream side, and the shroud includes an inlet flow path that is open at a portion between the first propeller and the second propeller of the flow path-forming surface.

Abstract: An atomizer for applying a coating includes a nozzle plate, an actuator, and an acoustic focusing device. The nozzle plate defines at least one aperture. The actuator is configured to oscillate to form pressure waves within a fluid to eject the fluid from the nozzle plate. The acoustic focusing device focuses the pressure waves toward the apertures.

Abstract: A vessel includes a vessel body, an engine, a propulsion device, a drive shaft, a partition wall, a bearing, an elastic member, an outer housing, and a positioning member. The drive shaft transmits a driving force of the engine to the propulsion device, and the propulsion device generates a thrust by the driving force. The drive shaft is inserted into an insertion hole of the partition wall. The bearing rotatably supports the drive shaft. The elastic member supports the bearing. The outer housing supports the elastic member, and is fixed to the partition wall. The positioning member positions the elastic member with respect to the bearing and the outer housing by pressing the elastic member.

Abstract: A rocket propulsion system comprises a combustion chamber, an oxygen supply system, comprising an oxygen supply duct and being configured to supply oxygen to the combustion chamber, and a hydrogen supply system, comprising a hydrogen supply duct and being configured to supply hydrogen to the combustion chamber. An ignition unit of the propulsion system, to which at least portions of the oxygen and the hydrogen supplied to the combustion chamber can be supplied, is configured to initiate combustion of the oxygen-hydrogen mixture in the combustion chamber. The propulsion system further comprises a cooling duct extending along an inner surface of a combustion chamber wall and through which at least a portion of the oxygen supplied to the combustion chamber, at least a portion of the hydrogen supplied to the combustion chamber or a combustion gas mixture emerging from the ignition unit flows.

Abstract: A marine thruster includes a cylinder with a front opening and a rear opening; radial baffles positioned within an interior of the cylinder to separate the interior into equally divided water chambers; pistons positioned within a corresponding one of the equally divided water chambers; and an inner-ring rotary valve engaged with the cylinder to allow for side intake of water and the separation of each of the equally divided water chambers into a dry section and a wet section by pistons; the pistons engage with a power source, the power source providing axial reciprocating motion; and the pistons push water through the equally divided water chambers.

Abstract: A Side-Intake piston water jet propulsor for marine vehicles employs a concept of Side-Intake of water and generates thrust through piston's reciprocating motion in cylinder. The concept of Side-Intake makes intake openings on the side and near the discharging end of the cylinder wall to achieve that the piston separates the cylinder into a dry and a wet compartment during its movement. The dry compartment is kept at atmospheric or ambient pressure. As a result, the piston confronts air or ambient pressure instead of water during its recovering stroke for water intake. From hydrodynamics point of view, this characteristic of piston's recovering stroke through air achieves the same function as an oarsman recovering his oar through air. However, said propulsor achieves that under water or a vessel's water line.

Abstract: A marine vessel comprising: a command module; first and second buoyant tubular foils; and first and second struts for connecting the first and second buoyant tubular foils to the command module, respectively; wherein the first and second buoyant tubular foils provide substantially all of the buoyancy required for the marine vessel; and wherein the marine vessel further comprises first and second engines enclosed within the first and second buoyant tubular foils, respectively, and first and second propulsion units connected to the first and second engines, respectively, for moving the marine vessel through the water.

Abstract: A propulsion device including a chamber that stores a superfluid, a substrate coupled to a portion of the chamber, a plurality of orifices extending through the substrate, each of the plurality of orifices having a first end and a second end opposite the first end, the first end disposed in an interior of the chamber and the second end disposed outside the chamber; and a pressure source that generates a pressure differential between the first end of each of the plurality of orifices and the second end of each of the plurality of orifices.

Abstract: A thrust generating apparatus which is positioned under water and configured to generate a thrust by ejecting water includes a duct-shaped stator provided with a plurality of armature coils, and a plurality of ring-shaped rotors which are arranged radially inward of the stator and provided with permanent magnets respectively corresponding to the plurality of armature coils, wherein the plurality of rotors are arranged in series in a rotational axis direction thereof and each of the rotors has a propeller vane protruding radially inward. A thrust generating apparatus is capable of outputting a high driving power without increasing a propeller diameter.

Abstract: The invention relates to a device and a method for feeding a propulsion chamber 5 of a rocket engine 1 with at least with a first propellant. The device comprises at least a first tank 2 for containing said first propellant, a first feed circuit 4 connected to the first tank 2, and a first electric pump 10 within said first tank 2 in order to pump said first propellant through the first feed circuit 4. In the method, the first propellant is pumped through the first feed circuit 4 from the first tank 2 by at least said first electric pump 10 that is immersed in the first propellant within the first tank 2.

Abstract: A cryogenic thruster assembly including: a reignitable main thruster; a first cryogenic tank connected to the main thruster to feed the main thruster with a first propellant; a first gas tank; at least one settling thruster; and a first feed circuit for feeding the first gas tank. The feed circuit of the first gas tank is connected to the first cryogenic tank and includes a heat exchanger for using heat given off by the at least one settling thruster to vaporize a liquid flow of the first propellant as extracted from the first cryogenic tank to feed the first gas tank with the first propellant in the gaseous state. A method feeds the first gas tank with the first propellant in the gaseous state.

Abstract: A jet propelled watercraft includes a jet pump that jets water rearward from a jet port, a reverse gate, a reverse gate moving mechanism, and a withdrawal controller. The reverse gate is movable in an up/down direction between a reverse drive position at which an entirety of the jet port is covered and a forward drive position at which the entirety of the jet port is open. In a state of being positioned at the reverse drive position, the reverse gate guides forward the water that has been guided to the jet port. The reverse gate moving mechanism includes an electric motor that generates power to move the reverse gate between the reverse drive position and the forward drive position, and a transmitting mechanism that connects the electric motor and the reverse gate. The withdrawal controller monitors malfunctions of the reverse gate moving mechanism.

Abstract: A jet propulsion boat includes a boat body, an engine, a jet propulsion mechanism, and a reverse gate. The reverse gate is arranged rearward of the jet propulsion mechanism and is configured to move to a forward movement position that allows a jet flow from the jet propulsion mechanism to flow backward, a reverse movement position that allows the jet flow from the jet propulsion mechanism to flow forward and downward, and a neutral position that allows the jet flow from the jet propulsion mechanism to flow in the lateral direction. The reverse gate includes a first member and a second member. The first member includes a downward opening and a pair of lateral openings open to the right and left when the reverse gate is positioned in the neutral position. The second member covers at least a portion of the downward opening when the reverse gate is positioned in the neutral position.

Abstract: A deflector control portion in a jet propulsion boat causes a deflector to swing by controlling a deflector drive mechanism in response to an operation of a shift operating portion. The deflector control portion causes the deflector to move to a first trim position when the shift operating portion is switched to a forward movement shift position. The deflector control portion causes the deflector to move to a second trim position when the shift operating portion is switched to an operating shift position.

Abstract: A power generator system utilizing the jet power of circulatory water flow in taper conduits is provided. The system comprises four jet components (10,20,30,40), a Pelton turbine generators and a pumping-up tail water circulation device. The jet components (10,20,30,40) comprises a taper conduits. The taper conduit is combined by a front big diameter conduit (12), a middle 30° taper conduit (5), and a rear small diameter nozzle (6). A horizontal high pressured pump (4) is provided in the front big diameter conduit (12), and supplies enough power to the water flow in the conduit when it runs. The taper conduit (5) can increase the velocity of water flow to form high speed jet flow of the rear small diameter nozzle (6). The group of Pelton turbine generators is driven to generate electricity by utilizing the jet flow. The pumping-up tail water circulation device pumps the tail water from the sealed tail water pond to the ground, to circularly supply the water needed by the taper conduit.

Abstract: A rocket propulsion system having a liquid fuel tank and a liquid oxidizer tank, where a liquid inert gas tank supplies liquid inert gas to a liquid inert gas pump driven by a turbine of the engine to pressurize the liquid inert gas, which is passed through a heat exchanger around the nozzle to vaporize the inert gas, that is then used to pressurize the liquid oxidizer tank so that a liquid oxidizer pump is not needed, or to pressurize both the liquid oxidizer tank and the liquid fuel tank so that a liquid oxidizer pump and a liquid fuel pump are not needed in the rocket engine.

Abstract: 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.

Abstract: A nautical engine comprising at least one combustion chamber provided with a first opening for feeding an air and fuel mixture, at least one spark plug for igniting the mixture, at least one second opening for exhausting the exhaust gas derived from the ignition of the mixture, a device adapted to feed at least one combustion chamber by the at least one first opening, a control device adapted to control the feeding device for feeding the mixture into the combustion chamber and for igniting the spark plug for igniting the mixture. The feeding device comprises a nozzle adapted to spray the mixture at a pressure to open the first valve of the chamber, and, after having closed the first opening of the first valve, the second valve, for exhausting the gas, can be opened by the gas produced by the ignition of the mixture in the combustion chamber.

Abstract: Described is a locomotive implant for usage within a predetermined magnetic field. In one embodiment magnetohydrodynamics is used to generate thrust with a plurality of electrodes. In another embodiment, asymmetric drag forces are used to generate thrust.

Abstract: One subject of the present invention is a propulsion method comprising: the injection, into at least one combustion chamber (1), of at least one liquid oxidizer (OX) and of hydrogen (H2); the combustion of said at least one liquid oxidizer (OX) and hydrogen (H2), in said at least one combustion chamber (1), for the generation of combustion gases; and expulsion of said combustion gases. Said process comprises, upstream of said injection: the generation of at least one portion of said hydrogen (H2), advantageously of all said hydrogen (H2), from at least one solid compound (5?); said generation from said at least one solid compound (5?) comprising a combustion reaction between said at least one solid compound (5?) chosen from alkali metal borohydrides, alkaline-earth metal borohydrides, borazane, polyaminoboranes and mixtures thereof and an oxidizing charge (5?). Another subject of the present invention is a propulsion device suitable for the implementation of said method.

Abstract: A system and related methods for manned and/or unmanned marine transportation involving equipping a vessel capable with a linear pump for propelling the vessel through or substantially over a body of water.

Abstract: An electrical linear motor for propelling a marine vessel through a liquid medium, comprises a housing secured to the marine vessel and submerged in the liquid medium, an insert within the housing and having at least two electrical coil windings disposed on internal walls of the insert; a thruster subassembly moves between the internal walls of the insert, the thruster subassembly having a front cover, an internal channel with check valve and at least two sets of permanent magnets attached to the thruster subassembly and maintained in sufficiently close proximity to the electrical coil windings so that an electromagnetic field created by a controlled energizing of the electrical coil windings interacts with a magnetic field from the permanent magnets to provide a resulting linear force, which causes a reciprocating linear motion of the thruster subassembly, wherein the check valve is in an open position during a back stroke of the thruster subassembly so that the liquid medium flows freely through the thruste

Abstract: There is described a nautical engine comprising at least one combustion chamber (1) provided with a first opening (11), normally closed by a first valve (12), for feeding the air and fuel mixture, at least one spark plug (20) for igniting the mixture, at least one second opening (14), normally closed by a second valve (15), for exhausting the exhaust gas deriving from the ignition of the mixture, means (2) adapted to feed at least one combustion chamber by means of said at least one first opening, a control device (30) adapted to control said feeding means for feeding the mixture into the combustion chamber and for igniting the spark plug for igniting the mixture. Said feeding means comprise a nozzle (30) adapted to spray said mixture at a pressure such as to open said first valve of the chamber, and in that, after having closed said first opening of the first valve, said second valve for exhausting the gas can be opened by the gas produced by the ignition of said mixture in the combustion chamber.

Abstract: In an engine, a rotor having a folded jet pipe is rotatably supported in a sealed container filled with a liquid. A heating portion is inserted in a center cylinder at the center of the rotor, and a fluid of a high temperature is passed therethrough to vaporize the liquid sucked through the suction pipe of the rotor. A mixture of steam and liquid is jetted from the jet pipe due to the pressure of the steam that is vaporized to rotate the rotor. A check valve for jetting and a check valve for suction are disposed at the ends of the jet pipe and the suction pipe. The jetted steam is guided to a condenser disposed on the sealed container, and is condensed and is refluxed into the sealed container. A vacuum pump is connected to the condenser, and the pressure in the sealed container is held at the saturated steam pressure.

Abstract: A system or method of propelling a vehicle with a multimodal propulsion system is provided. This multimodal propulsion system includes a primary inlet, a high-pressure gas generator, a gas generator exhaust system, a secondary fluid inlet, and a propulsion exhaust system. The primary inlet receives an incoming fluid flow that is provided to the high-pressure gas generator. The high-pressure gas generator coupled to the primary inlet produces a high-pressure exhaust from the incoming fluid flow. The high-pressure gas generator exhaust and secondary inlet couple to the propulsive exhaust system which mixes the two flow streams. The secondary flow may be gaseous or liquid fluid flow such as air flow for airborne flight and water for waterborne operation. The mixed fluid flow is expelled by the propulsive exhaust system that can propel the vehicle.

Abstract: The water rocket engine with a two-phase nozzle includes a water rocket propulsion system having a reservoir, and a nozzle assembly disposed along a central longitudinal axis therein, the nozzle assembly comprising an inverted cup shaped fluid capture vessel having a substantially concave sidewall and extending away from an elongated tube. Open lower portion of the fluid capture vessel forms a fluid inlet. The elongated tube has a concave shaped side wall that forms a nozzle gas inlet at an upper portion of the tube, a nozzle outlet at a lower portion of the tube, and a passageway disposed between the tube upper portion and the tube lower portion. Within the confines of the capture vessel, fluid injection holes are disposed in the tube sidewall to provide fluid intake into the nozzle passageway where fluid and gas combine to form a two phase propellant.

Abstract: A simply constituted steam engine efficiently obtains mechanical energy not only from a heat source of a high temperature but also from the exhaust heat of an internal combustion engine and various kinds of heat sources of a low-temperature state such as the solar heat. In the engine, a rotor (5) having a folded jet pipe (51) is rotatably supported in a sealed container (1) filled with a liquid. A heating portion (9) is inserted in a center cylinder (50) at the center of the rotor, and a fluid of a high temperature is passed therethrough to vaporize the liquid sucked through the suction pipe (52) of the rotor (5). A mixture of steam and liquid is jetted from the jet pipe (51) due to the pressure of the steam that is vaporized to rotate the rotor (5). A check valve (53) for jetting and a check valve (54) for suction are disposed at the ends of the jet pipe (51) and the suction pipe (52).

Abstract: A mechanical device efficiently converts energy stored in a highly compressed gas, such as air in a pipeline or SCUBA tank, to mechanical energy, such as might be used to drive an electrical generator or to propel a water craft.

Abstract: The device for injecting a liquid mono-propellant with a large amount of modulation of its flow rate and disposed at an upstream end of the wall of a combustion chamber of a rocket engine has a feed channel for feeding a mono-propellant from a tank. The device includes a single annular speed-up channel connected to the feed channel and having its outlet opening out via an annular injection section, the speed-up channel and the annular injection section being defined firstly by a first wall forming a stationary surface of revolution situated level with said upstream end, and secondly by a second wall forming a surface of revolution that is on a part that is movable in translation relative to the first wall forming a stationary surface of revolution.

Abstract: An electrical linear motor for propelling a marine vessel comprises a thruster assembly disposed within a guide tube. Permanent magnets are attached to the thruster assembly and placed in close proximity to electrical coil windings, which are positioned outside of and parallel to the guide tube. Electrical current energizing the coil windings creates an electromagnetic field, which interacts with the magnetic field of the magnets to cause reciprocating linear motion of the thruster assembly with the guide tube. During the non-propelling back stroke, a check valve on the thruster assembly is in open position to allow free passage of water. The check valve is moved to a closed position during the working stroke of the thruster assembly, allowing the thruster assembly to propel the marine vessel.

Abstract: A method, system and apparatus for generating thrust. The method, system and apparatus can include a fuel that may be accelerated into one or more openings on a rotating wheel. The rotating wheel, which may be balanced, may then have a temporary increase in mass in one location on the wheel. Additionally, the fuel that is accelerated into one or more openings in the wheel may be decelerated and may exert an outward force on the wheel. This generation of force can be repeated and increased to provide thrust.

Abstract: The water rocket engine with a two-phase nozzle includes a water rocket propulsion system having a reservoir, and a nozzle assembly disposed along a central longitudinal axis therein, the nozzle assembly comprising an inverted cup shaped fluid capture vessel having a substantially concave sidewall and extending away from an elongated tube. Open lower portion of the fluid capture vessel forms a fluid inlet. The elongated tube has a concave shaped side wall that forms a nozzle gas inlet at an upper portion of the tube, a nozzle outlet at a lower portion of the tube, and a passageway disposed between the tube upper portion and the tube lower portion. Within the confines of the capture vessel, fluid injection holes are disposed in the tube sidewall to provide fluid intake into the nozzle passageway where fluid and gas combine to form a two phase propellant.

Abstract: 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, a boat or a ship. A watercraft can be propelled by the thrust produced by a high-speed waterjet discharged from a nozzle located at the rear of the watercraft. A device that enables this type of propulsion is called a waterjet propulsor or a propulsor. Larger watercraft, such as a boat or a ship may often have two or more waterjet propulsors. The improved steering nozzle design incorporates a groove(s) or a channel(s) that is formed or machined into the steering nozzle wall thickness and does not exceed the thickness of the wall. The groove(s) or channel(s) begins at a point between the steering nozzle inlet and exit and ends at a point near or at the exit of the steering nozzle.

Abstract: A preload system for bearings in a waterjet propulsion apparatus, the apparatus including a water intake section and a pumping unit including a bearing cartridge. The bearing cartridge is designed such that during operation a preload system provides tailoring between radial and axial thermal growths of a plurality of bearing components that comprise the bearing cartridge and such that an initial ambient temperature preload condition can be maintained or reduced during normal water mode operation conditions. The preload system includes a plurality of spacers that when positioned relative to the bearing components of the bearing cartridge prevent relative motion between the bearing components during land mode operation and maintain or reduce the initial ambient room temperature preload condition during normal water mode operation.

Abstract: A pressure-actuated rocket system comprises a bottom base, a detonator and a rocket body. A top base is placed on a top surface of the bottom base. At least one through hole is located on a side of the top base and extended to an opening of the top surface. The hollow detonator has a closed and an opened ends. The rocket body is a bottle with fins. After soda powder is placed inside the detonator and vinegar is filled into the rocket body, the bottom base, the detonator and the rocket body are held inclined. The openings are aimed at the inclined bottom base in turn, the pressure-actuated rocket system is then turned upside down. Soda powder subsequently falls and reacts with vinegar, and gas is generated. A pressure accumulates inside the rocket body until it is high enough to shoot the rocket body up.

Abstract: An integrated propulsion and guidance system for a vehicle includes an engine coupled to an impeller via a driveshaft to produce propulsive force. The impeller includes a hub and a plurality of blades, wherein one or more of the blades is pivotably mounted to the hub. A control system provides a control signal to the impeller to adjust the blade pitch of the pivotable impeller blades as the blades rotate about the hub. The change in blade pitch produces a torque on the driveshaft that can be used to control the heading of the vehicle. By varying the magnitude and phase of the control signal provided to the impeller, the torque can be applied in a multitude of distinct reference planes, thereby allowing the orientation of the vehicle to be adjusted through action of the impeller.

Abstract: A propulsion system for a large watercraft, e.g., for a high-speed, military surface craft, includes at least one water jet propulsion device (water jet) beneath the vessel. An operating method of such a system includes propulsive energy by combustion engines, e.g., gas turbines, and distributing the exhaust gases created by the combustion engines beneath the vessel in the water by the use of water flow of the water jet system. In such a method, the water flow speed of the water jet system is adjusted in accordance with the requirements of exhaust gas discharge and distribution.

Abstract: An improved marine engine control methodology is utilized in either single or twin engine applications, and provides a safe and logical transitioning between manual and automatic operating modes. A standard software instruction set is installed in a microprocessor-based engine control module for each engine, and a discrete input informs the control module if the respective engine is a master engine or a slave engine. In single engine applications, the engine is identified as a master engine, while in twin engine applications, one of the engines is identified as a master engine, and the other as a slave engine. The control software provides an operator activated speed control function for a master engine, and an operator activated sync control function for a slave engine. Each engine has an operator manipulated throttle lever for controlling the respective engine throttle position during the manual operating mode, and for defining a limit throttle position during the automatic operating modes.

Abstract: A water jet propulsion apparatus is provided with an impeller rotatably disposed in a duct forming a channel. A waterproof seal is provided between a collar provided around an impeller shaft rotatably supported within the duct and coupled to the impeller and the stator. The collar is coupled to the impeller via the waterproof seal. The impeller shaft is screwed to the rear part of the impeller, and a drive shaft is spline-connected to the front part of the impeller. A rubber buffer for the rear end of the drive shaft is provided between the front end of the impeller shaft in the impeller and the rear end of the drive shaft. The peripheral portion of the buffer is formed in a shape such that air escapes from the impeller shaft side toward the drive shaft side when the impeller shaft is secured for preventing contact of water with the impeller shaft.

Abstract: A propulsion system (163) having various applications one of which is as a marine drive system for watercraft. The propulsion system (163) comprises a flow passage (173) having an intake (175) for communicating with a source of working fluid such as seawater and an outlet (177). A mixing zone (209) is disposed within the flow passage (173) between the intake (175) and the outlet (177). An injection means including annular nozzle (217) is provided for injecting a hot compressible driving fluid (175) such as steam into the mixing zone (209) in a flow direction towards the outlet (177). The arrangement is such that the interaction between the steam and the seawater in the mixing zone (207) develops a pressure reduction in the mixing zone (207) to cause seawater to be drawn from the source into the mixing zone (207) and propelled towards the outlet (177). A marine drive unit incorporating the propulsion system is also described and claimed, as well as other aspects related to the propulsion system.

Abstract: A rocket with a high pressure propellant module, comprising a toy bottle rocket that uses gases generated from the reaction between baking soda and vinegar. A mechanism controls the release of the gas formed by the chemical reaction and allows the gas to reach a high pressure inside the rocket prior to release.

Abstract: A system for propelling a watercraft using hydrogen. The system comprises a combustion chamber, an accumulator system, an ignition system, and a propulsion control system. The combustion chamber defines an upper portion and a lower portion. The accumulator system stores pressurized fluid. A first check valve is arranged to allow water to flow from the exterior of the watercraft into the lower portion of the combustion chamber. A second check valve is arranged to allow water to flow from the lower portion of the combustion chamber to the accumulator system. A propulsion control valve is arranged to control the flow of water from the accumulator system to the exterior of the watercraft. A mixture of hydrogen and oxygen is introduced into the upper portion of the combustion chamber.

Abstract: A housing for a propulsion system, such as for a plurality of disks, is provided as well as a system and a method for using the same. The housing is shaped to provide a streamlined motion through a fluid, such as air or water. Openings in the housing allow the fluid to flow through the propulsion system. The housing may be attached to a shaft in a motor or engine to provide a drive for the propulsion system contained therein.

Abstract: This invention concerns an internal combustion engine with a combustion chamber (8) for burning the working gas in an explosion stroke and, connected to the combustion chamber (8), a pump chamber (18) which can be filled via an input orifice (181) with a driving fluid which can be ejected through an exhaust orifice (182) by the effect of the combustion gas formed during the explosion stroke; this internal combustion engine is provided with a spraying device (19, 50) with which a coolant can be sprayed into the pump chamber (18) during an implosion stroke subsequent to the explosion stroke.

Abstract: A propulsion system for accelerating and directionally controlling a fluid having a continuous dynamic surface for circulating through a fluid from an entrainment region where fluid is introduced to the dynamic surface to a thrust region where fluid is discharged from the dynamic surface. The dynamic surface accelerates the fluid proximate to the surface so as to produce a layer of accelerated fluid from the entrainment region through the thrust region. A motor is operatively connected to the dynamic surface for driving the dynamic surface. A separator plate is positioned next to the dynamic surface. The separator plate has a leading edge for stripping the layer of accelerated fluid from the dynamic surface, and a substantially flat thrust face adjacent to the leading edge for directing the accelerated fluid in a desired direction.

Abstract: The invention relates to a variable venturi for a watercraft vehicle or similarly powered vehicle which allows the operator of the vehicle to selectively choose to operate a watercraft vehicle for achieving maximum acceleration or, alternatively, maximum top end speed. The venturi is comprised of a collar surrounding the venturi adjacent to a distal end of the venturi. At such time as the collar is activated, exposing the water flow exiting the venturi to atmospheric pressure, the diameter of the water flow exiting the venturi is reduced by approximately 1.0 mm. to 1.5 mm. in radius. This slight change in the surface area of the water flow provides a lower mass flow of the exiting water with an increased velocity of the water and top speed of the vehicle. Alternatively, a larger diameter venturi provides a higher mass flow with a decreased velocity and maximum acceleration.