Coanda Effect Propulsion Patents [**rexresearch**](http://rexresearch.com/) [**rexresearch1**](http://rexresearch1.com/) --- **Coanda Effect Propulsion Patents** --- [**Related:**](../CoandaEffect/CoandaEffect.html) [[**COANDA, Henri : Coanda Effec**](../CoandaEffect/CoandaEffect.html)t](CoandaEffect/CoandaEffect.html)~ Book & 100+ patents. Controlled boundary layer entrains up to 100x more air. --- ***Coanda Effect -- Flow Phenomena and Applications*** **Noor A Ahmed [ [PDF](Coanda%20EffectNoorAhmed.pdf) ]** --- **HYBRID REACTIVE PROPELLER WITH COANDA EFFECT AND FLYING-TAXI AIRCRAFT USING IT** **RO138303** ****[ [PDF](RO138303A2.pdf) ]**** The invention relates to a hybrid reactive propeller with CoandA effect and a flying-taxi aircraft using it. According to the invention, the propeller consists of a casing (4) with a taper part (a) continued with a cylindrical part (b) at the inlet of which there is positioned an electric motor (5) with its shaft made integral with a tubular hub (1) with a number of 2...3 suction airscrews (B1, B2 and B3) made with rectangular or trapezoidal radial blades (2), each such blade having the edge made integral with a marginal blade (3) with the length in the rotation plane but oriented under an angle (I3) in relation to the tangent to the rotation circle, the cylindrical part (b) having a number of 4...8 thermo-reactive propellers (7) with a sparking plug (11) and a nozzle (8) fixed at the end of a fuel pipe (9) coming from a fuel tank (R) by means of a system (S) with an electro-pump (10) and an electro-valve (g), the propellers (7) driving three downstream airscrews (D1, D2 and D3) with radial heat-resistant blades (7), made integral with a hub (1') fixed onto the lower end of the electric motor (5) shaft which, after the start of the hybrid propeller, is switched to the function of electric generator. The claimed aircraft has a body (A) and two wings (C1 and C2) of a relatively large surface, each with a part of aileron (14) and a hybrid ascension propeller (P1 and P2), in the back side it has a propeller (V1 and V2), preferably an electric downstream one, with a double electric motor (19) with two counter-rotation airscrews (22 and 22'), fixed onto a ring-like casing (21) which may be rotated and, over the air inlet of the hybrid propellers (P1 and P2), there is a metallic shutter (15) for opening/closing the air inlet made of two symmetrical halves actuated by the rods of electric linear actuators (16). **Tilting transformation vertical take-off and landing aircraft based on coanda effect** **CN117682117** **[ [PDF](CN117682117A.pdf) ]**The invention discloses a tiltable and transformable vertical take-off and landing aircraft based on the coanda effect, and belongs to the technical field of aircrafts, the tiltable and transformable vertical take-off and landing aircraft comprises an aircraft body, a high-pressure manifold and a turbojet engine are arranged in the aircraft body, an air suction port is formed in the end of the aircraft body on the central axis of the aircraft body, and the air inlet end of the high-pressure manifold communicates with the air outlet end of the turbojet engine; jet propellers symmetrically arranged at four end corners along the central axis of the machine body are arranged outside the machine body, a flow control mechanism is arranged in the air outlet end of the high-pressure manifold, each jet propeller comprises an annular columnar empty shell, an air inlet is formed in the side wall of each annular columnar empty shell and rotationally connected with the air outlet end of the corresponding high-pressure manifold, and the flow control mechanism is connected with the flow control mechanism. And one end of the inner ring surface of the annular columnar empty shell is provided with an annular slit for spraying air to the other end of the inner ring surface of the annular columnar empty shell. The jet propellers designed based on the coanda effect and the injection effect can improve the load capacity of the aircraft, the turbojet engine with fuel oil as a power source is located in the aircraft body, the cruising ability is higher, and noise is lower. **Underwater propelling and steering integrated propeller** **CN117262180** **[ [PDF](CN117262180A.pdf) ]**The invention discloses an underwater propelling and steering integrated propeller and belongs to the technical field of underwater propelling and steering devices.The interior of a propeller shell is vacuum, a converter is arranged in the propeller shell in a sleeved mode, a groove is formed in the surface of the converter, one end of a fixed connecting shaft is rotationally connected to one side of the converter, and the other end of the fixed connecting shaft is rotationally connected to the other side of the converter; one end of the telescopic mechanism is connected with the propeller shell, the other end of the telescopic mechanism is connected with the partition plate, one part of the telescopic mechanism is inserted into the converter and connected with the interior of the converter, the other part of the telescopic mechanism extends out of the propeller shell, and the side, extending out of the propeller shell, of the telescopic mechanism is hemispherical. The wheel-blade-free vector thruster realizes utilization of water flow through the coanda effect; the resistance of a traditional rudder to water flow propelling of a propeller is eliminated, and energy loss is reduced; the underwater propelling and steering integrated function of the vector propeller is achieved; the efficiency of the whole system is improved, the thrust vectorization degree is high, and the thrust can still be guaranteed when the aircraft turns. **Controllable vector jet propeller and underwater robot** **CN116654232** **[ [PDF](CN116654232A.pdf) ]**The controllable vector jet propeller comprises a water pump, a control assembly and a Tesla valve device, the water pump is used for forming jet flow with pressure, and when thrust of the controllable vector jet propeller needs to face one of the upper direction, the lower direction, the left direction and the right direction, the Tesla valve device is connected with the control assembly. If yes, the outer barrel is controlled to open a first opening in the direction, the jet flow forms wall-attached jet flow on the opposite side of the first opening, and then the wall-attached jet flow is guided into a corresponding Tesla valve channel and is transmitted forwards in a one-way mode; when the pushing force needs to be made to face the right front, the outer barrel is controlled to close all the first openings, and jet flow is directly guided into the straight channel from the main channel to form forward pushing power; the controllable vector jet propeller designed based on the Coanda effect and the Tesla valve has the advantages of being simple in structure, convenient to control, stable in jet flow and high in energy efficiency, installation is convenient, meanwhile, no external complex auxiliary mechanical structure exists, and electromechanical design is facilitated. **Fluid propeller based on coanda effect** **CN116639239** **[ [PDF](CN116639239A.pdf) ]**The invention belongs to the technical field of fluid propulsion, and particularly relates to a fluid propeller based on a coanda effect, **PRE-SWIRL STATOR HAVING COANDA EFFECT** **KR20230094685** **[ [PDF](KR20230094685A.pdf) ]**The present invention relates to a pre-swirl stator which is installed in front of a propeller and includes a plurality of blades arranged radially around a rotation axis of the propeller. The blade includes: a body unit having a streamlined cross-sectional shape including a leading edge, a trailing edge, and a pair of side wall parts; a fluid inlet unit formed on one side of the body unit to allow fluid to flow into the body unit; and a fluid discharge unit formed on the other side of the body unit and discharging the fluid flowing into the body unit. **FLUID SUPPLY APPARATUS FOR INDUCING CAVITATION AND COANDA EFFECTS** **US2023093100** **[ [PDF](US2023093100A1.pdf) ]**A fluid supply apparatus for inducing cavitation and Coanda effects, includes: a cavitation generator configured to allow an introduced fluid to flow while rotating along a propeller-shaped wing so as to generate microbubbles in the fluid; and a Coanda generator disposed in front of the cavitation generator and having a plurality of Coanda generating protrusions arranged at regular distances so that, as a fluid passing through the cavitation generator to contain microbubbles passes through a passage between the Coanda generating protrusions, a velocity increases and the pressure decreases, thereby causing a Coanda effect in which the fluid flows along a surface of an object. **AERIAL VEHICLE WHICH MOVES BY USING THE AIR JET FLOWING ALONG AN AERODYNAMIC PROFILE** **RO137290** **[ [PDF](RO137290A0.pdf) ]**The invention relates to a self-propelled aerial vehicle, manoeuvrable both horizontally and vertically, which uses the gas-dynamic effect of the flow of the air jet along a profiled wall in order to increase the lifting force. According to the invention, the vehicle consists of a thruster (1), which may be a turbine or a propeller, centrally placed in a vertical profiled structure, such as a nozzle (2) placed at the top of an upper profiled aerodynamic fairing (3) in a much lowered position, so that the horizontal plane of the disc of the thruster (1) descends below the level of the upper surface of the fairing (3), thus achieving the inclusion of the system formed of the thruster (1) and nozzle (2) inside the fairing (3) which is aerodynamically profiled, at the inside part included, in order to provide a suitable shape for the new cavity through which the main air jet, that generated by the thruster (1), has an optimal flow towards a radial nozzle (4) formed by the upper turned-up edge of the nozzle (2) and the outer surface of the upper profiled fairing (3), nozzle (4) through which a subsonic radial jet is distributed over the fairing (3), which, together with the air mass entrained from the surrounding environment, adheres to the outer surface of the upper fairing (3) and leads to the occurrence of the Coanda effect and of the additional lifting force created by this gas-dynamic effect. **AIR VEHICLE USING GAS DYNAMIC EFFECT OF AIR JET FLOWING ALONG A PROFILED WALL FOR INCREASING LIFTING FORCE** **RO137102** **[ [PDF](RO137102A2.pdf) ]**The invention relates to a self-propelled air vehicle, controllable both horizontally and vertically, which uses the gas-dynamic effect of air jet flowing along a profiled wall in order to increase the lifting force. According to the invention, the vehicle consists of a profiled upper fairing (1) finished at the bottom with an even number of pairs of flaps (2) which provides control in a horizontal plane, by folding around an axle (11) placed at the lower horizontal edge of the flap (2), fairing (1) which is provided, on its outer surface, with some anti-torque/anti-rotation shutters (4), arranged annularly and equidistantly, having, in the lower part, an airtight enclosure (3) filled with helium or other gas lighter than air, the main lifting force being generated by a propeller (8) represented by a turbine or an airscrew, located centrally, on the upper part of the fairing (1), in a profiled vertical structure, such as a nozzle (9), mounted so as to provide the concentration of the air jet produced by the propeller (8) and to increase the efficiency thereof, vertical nozzle (9) the horizontal edge of which flares radially outwards, forming, together with the profiled upper fairing (1), an annular nozzle (5), which is used to generate the subsonic radial jet which adheres to the outer surface of the upper fairing (1) and leads to the occurrence of the Coanda effect and of the additional lifting force generated by this gas-dynamic effect, the lower edge of the upper fairing (1) being circularly surrounded by a thin ring-shaped wall (10), which improves the flowing of the power lines upon their separation from the upper profiled fairing (1). **Electric aircraft ducted fan wing upper surface blowing high lift device** **CN217374887** **[ [PDF](CN217374887U.pdf) ]**The utility model discloses an electric aircraft ducted fan wing upper surface blowing high lift device which comprises a wing duct, and a flap is rotationally installed at an outlet of the wing duct. The inner side of the wing duct is divided into a plurality of cavities at equal intervals by connecting wall plates, and a fan body, a propeller hub and a motor base are arranged in each cavity; and the fan body is rotationally connected with the propeller hub and the motor base. According to the ducted fan upper surface blowing high lift device, a flap is arranged behind an outlet of a duct, and the flap is folded during cruising to reduce cruising resistance. During hovering and low-speed flight, the flaps are put down, due to the Coanda effect, high-speed airflow blown out by the ducted fan can flow along the upper surfaces of the flaps without being separated, and the direction of thrust is changed after the airflow deflects. Airflow on the upper surface of the flap is further accelerated due to flap deflection, and a low-pressure area is formed to generate additional lift perpendicular to the fan axis. When the airplane advances at a low speed, the duct attack angle of the air blowing high lift device is small, and the air blowing high lift device is beneficial to work of the fan. **Ship propulsion system equipped with flow control module** **KR20220103396** **[ [PDF](KR20220103396A.pdf) ]**The present invention relates to a ship propulsion system equipped with means for controlling a flow of fluid flowing into a propeller by the Coanda effect, comprising: a propeller, a driving module, a rudder, and a flow control module installed in front of the propeller to control the flow of fluid flowing into the propeller. The present invention provides the ship propulsion system equipped with a flow control module in which the flow control module is provided with flow control wings protruding sideways on both sides of a ship in front of the propeller, a flow path is formed along the longitudinal direction inside the flow control wing and continues to the surface of the flow control wing, a high-pressure pump for supplying a high-pressure fluid is provided in the flow path, and the fluid compressed by the high-pressure pump is injected in a form of a jet spraying flow toward the propeller through the surface of the flow control wing through the flow path, thereby reducing the forward fluid resistance of the propeller. **Jet propeller** **CN216994813** **[ [PDF](CN216994813U.pdf) ]**The utility model relates to a jet propeller. The jet propeller comprises a mushroom-head-shaped shell and a spray pipe connected to the center position of the large-diameter end of the shell, an inner cavity is formed in the shell, a liquid inlet channel communicated with the inner cavity is formed in the upper side of the shell, a turbine for feeding liquid into the liquid inlet channel is rotationally assembled on the liquid inlet channel, and the turbine is connected with the inner cavity. The shell is fixedly connected with a driving motor for driving the turbine to rotate, a conical hole coaxially communicated with the spray pipe is formed in the shell, the hole diameter of one end, close to the spray pipe, of the conical hole is larger than that of the other end of the conical hole, and an annular hole which is coaxial with the conical hole and is communicated with the inner cavity and the conical hole is formed in the shell. The method that a traditional thruster uses a motor to drive a propeller to propel is abandoned, and the phenomenon that the thruster is damaged due to the fact that sundries in water are wound is avoided. By utilizing the coanda effect, the cavitation rate can be reduced so as to achieve the purpose of efficient and silent propulsion. **Propeller system for vessel** **KR102440248** **[ [PDF](KR102440248B1.pdf) ]**The present invention relates to a propeller system installed for normal ship propulsion. More particularly, the present invention is to provide a propeller system for a ship that improves propulsion efficiency by increasing thrust and reducing drag by applying the Coanda effect to a propeller, and also reduces cavitation due to the Coanda effect. To this end, according to the present invention, the propeller system for a ship comprises: a propeller whose blades are radially symmetrical around a hub; a propeller drive part including a drive unit for rotationally driving the propeller and a shaft connecting the drive unit and the hub; and a high-pressure water supply part for spraying high-pressure water on the surface of the propeller to increase lift of the propeller. **Ship propulsion system** **KR102440249** **[ [PDF](KR102440249B1.pdf) ]**The present invention relates to a propulsion system for a ship, to which the Coanda effect generated by jet injection flow is applied. The propulsion system for a ship comprises: a frame part protruding from a lower portion of a ship; a propulsion driving part install ed in the frame part; and a propeller part composed of a hub installed at an end of the propulsion driving part, and a plurality of blades installed with respect to the center of the hub. Moreover, a high-pressure pump is installed in the propulsion driving part. In addition, a communicating passage is formed in the propeller part from the inside of the hub through the inside of a blade to a surface of the blade. Moreover, a fluid compressed by the high-pressure pump is injected in a form of a jet flow through the communicating passage, thereby obtaining the lift and thrust at the same time. Therefore, the propulsion system for a ship of the present invention can significantly reduce carbon emissions and improve energy efficiency, compared to a conventional propeller system rotatably driven by an engine. **Full-revolving propeller based on Coanda effect** **CN114524072** **[ [PDF](CN114524072A.pdf) ]**The invention discloses a full-revolving propeller based on Coanda effect, comprising: a mounting flange fixedly connected with a hull; the circle center shaft of the slewing bearing coincides with the circle center shaft of the mounting flange, and the outer ring of the slewing bearing is fixedly connected with one mounting surface of the mounting flange; a steering mechanism; one end of the steering pipe is fixedly connected with the inner ring of the slewing bearing; a cavity is formed in a body of the annular structural part in the circumferential direction, and a slit outlet is formed in the inner side of the body of the annular structural part in the circumferential direction; a water inlet assembly is arranged in the middle of the inner side of the annular structural part. The output end of the water inlet assembly communicates with the cavity in the radial direction of the annular structural part. The shape of the inner side outer wall corresponding to any longitudinal section in the circumferential direction of the body of the annular structural part is a Coanda curved surface, so that water flow discharged from the slit outlet generates a Coanda effect; the outer wall of the outer side of the annular structural part body is fixedly connected with the end, not connected with the slewing bearing, of the steering pipe. **Blowing and high-lift device for upper surface of wing of ducted fan of electric aircraft** **CN113859517** **[ [PDF](CN113859517A.pdf) ]**The invention discloses a blowing and high-lift device for upper surface of a wing of a ducted fan of an electric aircraft which comprises a wing duct, and a flap is rotatably mounted at an outlet of the wing duct; the inner side of the wing duct is divided into a plurality of cavities at equal intervals by connecting wall plates, and a fan body, a propeller hub and a motor base are arranged in each cavity; and each fan body is rotationally connected with the propeller hub and the motor base. The flap is arranged behind an outlet of the duct, and the flap is folded during cruising to reduce cruising resistance. During hovering and low-speed flight, the flaps are put down, due to the Coanda effect, high-speed airflow blown out by the ducted fan can flow along the upper surfaces of the flaps without being separated, and the direction of thrust is changed after the airflow deflects. Airflow on the upper surface of the flap is further accelerated due to flap deflection, and a low-pressure area is formed to generate additional lift perpendicular to the fan axis. When the aircraft advances at a low speed, the attack angle of the duct of the blowing and high-lift device is small, and the blowing and high-lift device is beneficial to work of the fan. **Vertical take-off and landing fixed-wing aircraft using coanda effect for lift augmentation** **CN112937851** **[ [PDF](CN112937851A.pdf) ]**The invention discloses a vertical take-off and landing fixed-wing aircraft using coanda effect for lift augmentation, and relates to the field of aircraft design, in particular to a vertical take-off and landing fixed-wing aircraft using coanda effect for lift augmentation. The aircraft comprises a fuselage, a main wing part, an empennage part and a power part. The vertical take-off and landing fixed-wing aircraft has the advantages of fixed wing flight and vertical take-off and landing of rotor wings, during vertical take-off and landing, upward tension is mainly provided by main propellers of coaxial reverse propellers, and the front propellers only provide small upward tension and have the effect of adjusting the longitudinal posture of the aircraft, so that in the vertical take-off and landing process of the aircraft, the longitudinal attitude of the aircraft is in a balanced state. The coaxial reverse propellers are adopted, the diameter of the propellers is reduced under the condition that a certain propeller disc area exists, when all power cabins do not tilt, the aircraft can take off and land in a fixed wing state on a runway, energy consumed by taking off and landing is smaller, and the load of the aircraft can also be improved. **Fluid Supply Apparatus** **KR102222505** **[ [PDF](KR102222505B1.pdf) ]**The present invention relates to a fluid supply apparatus inducing cavitation and Coanda effects. In accordance with the present invention, the fluid supply apparatus inducing cavitation and Coanda effects includes: a cavitation generation part leading an introduced fluid to flow while rotating along a propeller-type wing part to generate fine bubbles in the fluid; a Coanda generation part placed in a front part of the cavitation generation part, and leading the fluid including fine bubbles to increase the flow velocity thereof while having a drop in pressure through Coanda generation protrusion parts to cause a Coanda effect in which the fluid flows along the surface of an object; and a second fluid spreading part penetrating the cavitation generation part from a rear end part of the cavitation generation part to be connected to the outer circumference surface of the Coanda generation part so as to increase the flow velocity thereof by spraying the fluid to the outer circumference surface of the Coanda generation part. Therefore, the present invention is capable of improving the Coanda effect on the surface of the Coanda generation part **AERODYNE WITH A PROPULSIVE SAUCER FOR COANDA EFFECT PROPULSION** **WO2020107093** **[ [PDF](WO2020107093A1.pdf) ]**An aerodyne propulsion system consisting of a propulsive saucer, whose lift and maneuverability forces are governed by the fluid jet Coanda effect. The design foundation resides in the replacement of the conventional open, shaft-driven propeller by an enclosed impeller. A power system of the aerodyne is specifically designed to increase the aerodyne's endurance, based on a customized photovoltaic cell adapted to curved and/or flexible substrates. The propulsion system is used in a class of autonomous personal aerodynes designed for controllable urban flight. **Propeller without paddle** **CN107757853** **[ [PDF](CN107757853A.pdf) ]**The invention discloses a propeller without a paddle. The propeller without the paddle comprises a main base body; a mounting chamber is formed in the main base body; a water inlet component is arranged on one side in the mounting chamber; and an underwater supercharging device is arranged, on the internal side of the water inlet component, in the mounting chamber. The propeller without the paddlecompresses the water body by using the underwater supercharging device immersed in the water and ejects the compressed water from a water outlet (a coanda effect may be caused on the surface of the propeller without the paddle) of the propeller without the paddle so as to generate a thrust force; therefore, the propeller can carry a machine body during advancing. The propeller without the paddlehas the advantages of small noise, high safety coefficient, compact structure, small volume, light weight, adaption to underwater severe environment, strong compatibility and so on; the traditional method for using a motor to drive the paddle to rotate for acceleration is avoided; and a phenomenon that the propeller is damaged due to the twisting of sundries in the water is avoided. **Propellant activative device and flight vehicle having the same** **KR20170090936** **[ [PDF](KR20170090936A.pdf) ]**The present invention relates to a propulsion apparatus and a flight vehicle including the same, and more specifically to a propulsion apparatus generating propulsion force by inducing Coanda effect by rotating a circular plate shaped rotation body instead of a propeller to pull out a nearby fluid to an edge side, and a flight vehicle including the same. The propulsion apparatus comprises: a rotation power supply portion (236) for supplying rotation power; a centrifugal force generation portion (232) connected to the rotation power supply portion (236) and rotating to generate centrifugal force; and a propulsion force generation portion (234) formed in a dome shape which has a convex upper surface. **Medium/low-altitude aircraft driving device and driving method and medium/low-altitude aircraft** **CN107021235** **[ [PDF](CN107021235A.pdf) ]**The invention relates to a medium/low-altitude aircraft driving device and a driving method and a medium/low-altitude aircraft. The driving device comprises a high-pressure air source, an air supply pipe and at least one propeller; the propeller comprises a shell, a guide cylinder arranged in the shell, and an annular slit; an annular cavity is formed between the guide cylinder and the shell; the annular slit communicates the annular cavity with the external; and the high-pressure air source communicates with the annular cavity through the air supply pipe. Most traditional small aircrafts use energy storage batteries as power sources; the energy storage batteries have the technical problems of high weight, short service life and limited cruising distance; the driving device adopts compressed air to drive to form high-speed downward spraying air currents under the Coanda effect; and relative negative-pressure area and positive-pressure area are formed above and below the aircraft to provide lift and propulsion to the aircraft. **HIGH EFFICIENCY DUCT PROPULSION APPLIED COANDA EFFECT FOR SHIP** **KR101689935** **[ [PDF](KR101689935B1.pdf) ]**The present invention relates to a propeller for a ship and, more specifically, relates to a duct propeller for a ship. According to the present invention, provided is the duct propeller for a ship, which comprises: a propeller; a duct having a wall to cover surroundings of the propeller, and a slit formed in a rear end of the wall; and a pump supplying high pressure water discharged through the slit. Moreover, a flow inducing curved surface radially expending to the outside from an outer circumference of the slit to a downstream area is formed in the duct. **Underwater vector propeller for realizing flexible steering by utilizing coanda effect** **CN105109649** **[ [PDF](CN105109649A.pdf) ]**The invention relates to an underwater vector propeller for realizing flexible steering by utilizing coanda effect. The underwater vector propeller comprises a casing, a main propelling motor, vector motors, mainstream channels, a subsidiary stream channel, a main propeller stream channel and partition boards, wherein the main propelling motor is mounted in the main propeller stream channel; each of the vector motor is provided with a screw propeller; the connecting spaces of the casing and the main propeller stream channel through the partition boards are used as the mainstream channels; the subsidiary stream channel is a channel formed by the structure of the inner walls of the casing; the subsidiary stream channel is connected with the two symmetrical mainstream channels; the vector motors are respectively arranged in the mainstream channels; two ends of the casing are in an opening structure. The underwater vector propeller for realizing flexible steering by utilizing the coanda effect, disclosed by the invention, has the advantages that when ships, submarines, unmanned underwater robots and the like need to swerve, the vector propelling can be realized through changing the rotational speed of different vector motors, so that the flexible underwater propelling control can be realized . **PERMEABLE AEROFOIL OR HYDROFOIL PROFILE** **RO125444** **[ [PDF](RO125444A2.pdf) ]**The invention relates to a permeable aerofoil or hydrofoil profile employed in the construction of the wings of a flying machine, such as an aircraft or airplane model, or of a sea ship or river boat, or in the construction of the blades of a hydraulic machine, such as a turbine, a pump or a propeller. According to the invention, the profile has some thin curved tubes (1) with upstream pointing convexity, placed allover the surface of a wing or blade, having at the ends some non-symmetrical nozzles convergent to a lower side wing (2) and divergent to an upper side wing (3), respectively, which, by the CoandA effect achieves the uniformization of the inlet and outlet speed (6 and 7), respectively, on the lower side wing and upper side wing (2 and 3), respectively, where the said speeds (6 and 7) are focused at the level of the orifices corresponding to the curved tubes (1). **TAIL BOOM** **US2011139924** **[ [PDF](US2011139924A1.pdf) ]**A tail boom capable of creating propulsive force during forward flight to increase the forward speed is provided. A tail boom producing a force that cancels out a torque effect due to the Coanda effect by forcing airflow generated by a propeller disposed on an upstream side downward through a slit penetrating in the thickness direction and provided at a lower part of one side surface is configured such that the airflow generated by the propeller contributes to the propulsive force during forward flight. **ROOF FAN RESONANCE HYBRID VEHICLE** **JP2009132352** **[ [PDF](JP2009132352A.pdf) ]**To provide a resonance hybrid vehicle capable of obtaining auxiliary drive force from natural power such as wind. ;SOLUTION: In the hybrid vehicle, a propeller of which a periphery is surrounded by a duct arranged on a roof of the automobile is operated by converting head wind generated at traveling of the vehicle to attain energy-saving by propulsion force obtained by reaction obtained by rearwardly flowing an air stream by strongly operating the propeller by pulling force caused by resonance of a duct wall and a differential pressure of the inside and the outside. Electric power generated by installing a generator on a hub part of the propeller is cooperated with original motive power. In the roof fan resonance hybrid vehicle, further energy-saving effect is utilized by propulsion force increased by Coanda effect and a simple flap of an aircraft. ; **RADIAL FLUID PROPULSION CIRCULAR WING.** **GR20080100707** **[ [PDF](GR20080100707A.pdf) ]**A radial (centrifugal) propulsion system based on fluids in motion, such as of hydro wind generators, which is characterized at least by: a) a circular wing (11) (ringwing) -with a frustoconical shape- the leading edge and the trailing edge of which(perimeter of small and large base of the cone, respectively) define its airfoil chord (straight side length of the cone), which forms with the plane of the small base an angle (A*), which defines the slope of the circular wing (11) and b) a main radial flow (15) over the circular wing (11) which forms with the airfoil chord at the leading edge of the circular wing (11) an angle of attack () -larger than 0 and smaller than 90 degrees, in particular larger than 8 degrees- and which due to the Coanda effect is curved depending on the angle of attack () and is produced by c) at least one centrifugal propeller (12), which by its blades -which are distributed at a suitable angle in relation to its radius (larger than 0 and smaller than 90 degrees)- that end to the leading edge of the circular wing, transforms a part of the power of the flow to mechanical power and transfers it to a rotor (20) (e. g. an electric current generator). **EXTENSIBLE ROTARY PROPULSIVE SCREW-RUDDER** **RU2005100809** **[ [PDF](RU2005100809A.pdf) ]**FIELD: shipbuilding; active control of ships. ^ SUBSTANCE: proposed rotary propulsive screw-rudder is made in form of water-jet propeller and is provided with streamlined symmetrical vertical nozzle which has water duct made in form of rectangular vertical slit over entire span in center of nozzle. Working member mounted in water duct consists of two vertical rotors for rotation at reversal; working member is mounted in symmetrical cylindrical recesses over entire span of nozzle. Vertical flap mounted at water duct outlet has symmetrical convex profile for turn relative to vertical axis lying in plane of symmetry of nozzle. Vertical flap is mounted at equal clearances between trailing edges of water duct and external convex surfaces of flap profile when it is placed in plane of symmetry of nozzle. Each clearance ensures limitation of flap putting-over. ^ EFFECT: enhanced handling of ship due to considerable lateral force on flap owing to Coanda effect **WIND AND HYDRAULIC POWER GENERATOR** **JP4939252** **[ [PDF](JP4939252B2.pdf) ]**To provide a wind and hydraulic power generator capable of operating at a high speed by creating Coanda effect by a shape of a nacelle to increase speed of fluid and apply the same on a propeller. ;SOLUTION: This wind and hydraulic power generator 1 is provided with the propeller 5 in a rear part of the nacelle 3 rotatably provided on a column 2. High speed fluid flow faster than flow speed caused by Coanda effect is generated on a circumference surface of the nacelle, and is made pass through to a front surface of the propeller 5 **PROPELLER FAN** **JPH04370399** **[ [PDF](JPH04370399A.pdf) ]** To further reduce operational noise of a fan and to improve performance o the fan by forming a suction side wall part of a bellmouth into a sectional shape curved in almost semicircular shape toward the outer in the diametric direction from an internal peripheral surface of a suction port. CONSTITUTION:A suction side wall part 42 of a bellmouth 4 is formed into a curved sectional structure continued to an internal peripheral surface of a suction port 41 and curved into almost semicircular shape toward the outer in the diametric direction while directing to the upstream of air. In this way, suction of' air is performed from a front surface side of a blade 2 and also from its peripheral side, and at the time of operation especially in a large flow amount region, air sucked from a peripheral side of the blade 2 is sucked into a side of the suction port 41 to flow along a surface of the suction side wall part 42 to almost prevent generation of exfoliation of an air flow in a part of the suction port 41. On the other hand, at the time of operation in a small flow amount of generating a reverse flow of air by increasing circulating resistance of air in the suction port 41, the reverse flow, generated in a suction side of the suction port 41, is deflected along a surface of the suction side wall part 42 smoothly to a peripheral side thereof by a Coanda effect in the surface of the suction side wall part 42. **IMPELLER FOR PROPELLER FAN** **JP3127850** **[ [PDF](JP3127850B2.pdf) ]**To ensure a high fan performance and also reduce an air force noise effectively at every operation state, in the impeller for a propeller fan. SOLUTION: The section shape near an impeller outer periphery edge 3e in a first area W, of the range from the front edge side end part 3h of an impeller 3 upto 2/3 of the length of an impeller outer periphery edge 3e is formed in a nearly wedge shape consisting of a negative pressure surface 3a extending in a straight line, straight line surface part 10 extending toward a pressure surface side with a prescribed included angle between a tip edge of the negative pressure surface 3a and the negative pressure surface 3a and an arc surface part continuing smoothly by an arc expanding the straight line surface part 10 and the pressure surface to the pressure surface side. When air is sucked in from the impeller outer periphery edge 3e side in the first area W, air flows to the pressure surface side along the straight line surface part 10 hardly being affected by the change of the flow-in angle. The air flowing along the straight line surface part 10 flows to the pressure surface side along the arc surface part due to the Coanda effect of the arc surface part and a high ventilation performance is realized. --- ---