Abstract: An aerodynamic-shaped airfoil having a cross-section which is essentially an inverted pan-shape with a leading edge into the wind and a trailing edge which has a flange doubled back underneath, toward the leading edge.

Abstract: A method and device for collecting energy from wind includes an airfoil having an outer surface defining a leading edge, a central section of greatest breadth adjacent to which a Bernoulli effect reduced pressure region results as an air flow passes over the airfoil from the leading edge to a trailing edge, an air passage contained within the outer surface, and a plurality of edge nozzles penetrating the outer surface within the section of greatest breadth. The edge nozzles each have an outlet orifice oriented toward the trailing edge and an inlet orifice feeding into the air passage and being positioned to communicate between the air passage and the Bernoulli effect reduced pressure region. The airfoil is positioned in the wind with the leading edge facing substantially into the wind and with the wind passing over the edge nozzles. An airflow-driven turbine capable of converting an airflow into rotational mechanical energy is also provided, the turbine being in airflow communication with the air passage.

Abstract: An impeller pump for moving large volumes of liquid against heads of up to 1 meteris formed by a substantial circular housing having its axis substantially vertical in which an impeller is mounted for rotation on the central axis. The impeller has an maximum diameter substantially equal to the inside diameter of the housing and is formed with a hub and the plurality of blades symmetrically positioned around the hub. Each blade extends radially outward of the hub from a root to a tip and has a foil shaped cross section with a lift to drag ratio at least 75 to 1 at a Reynolds number of under 10.sup.6. Each of the blades is skewed rearward in the direction of blade rotation so that the apparent aspect ratio of blade is increased and to reduce operating noise. Each blade has an angle of attack of between 2.degree. and 6.degree. and has a rake in the direction of flow through the impeller of between 3.degree. and 7.degree.. The impeller lifts water through the housing and directs it into the fish farm.

Abstract: A vehicle engine-cooling fan assembly for circulating air to cool an engine. The fan assembly has a central hub with a plurality of blades extending radially outward from the central hub. Each blade has a root joined to the central hub, a tip, and a span formed between the root and the tip. The blades are spaced circumferentially from each other, by unequal spacing angles, around the central hub. The unequal spacing angles minimize noise produced by the fan assembly. The blades are positioned at a radial location along a blade span by unequal setting angles which increase the efficiency of the fan assembly. The blades can have either a straight or a curved planform. Mechanical energy is imparted to the fan assembly from an electric motor, a hydraulic motor, or some other source. Also disclosed is a process for designing a vehicle fan assembly combining unequal fan blade spacing angles and unequal fan blade setting angles.

Abstract: A structure of a ventilation fan provided with a plurality of blades has a performance curve characterized by a gentle slope throughout the wide operating range instead of an S-hysteresis curve, in order to overcome a fluctuation phenomena of the operating flow rate. The blade tip cross-section lies on a first imaginary cylindrical surface and an angle of attack and pitch angle of the blade tip are formed as respective trajections by intersecting the first cylindrical surface by a second cylindrical surface whose center axis has been rotated about two axes.

Abstract: The present invention relates to a steam turbine comprising a rotor shaft integrating high and low pressure portions provided with blades at the final stage thereof having a length not less than 30 inches, wherein a steam temperature at first stage blades is 530.degree. C., a ratio (L/D) of a length (L) defined between bearings of the rotor shaft to a diameter (D) measured between the terminal ends of final stage blades is 1.4 to 2.3. This rotor shaft is composed of heat resisting steel containing by weight 0.15 to 0.4 % C, not more than 0.1 % Si, 0.05 to 0.25 % Mn, 1.5 to 2.5 % Ni, 0.8 to 2.5 % Cr, 0.8 to 2.5 % Mo and 0.15 to 0.35 % V and, further, the heat resisting steel may contain at least one of Nb, Ta, W, Ti, Al, Zr, B, Ca, and rare earth elements.

Abstract: A rotor blade for a rotary-wing aircraft, of an airfoil section has a basic blade thickness at 12% chord length, a portion of an increased blade thickness between the leading edge and a point corresponding to about 90% chord length, a maximum blade thickness at a position shifted backward, a curvature distribution concentrated on the middle portion thereof, and a portion contiguous with the trailing edge and cambered. The drag coefficient of the airfoil section is small when the Mach number is about 0.6 and the lift coefficient is about 0.6, and the airfoil section has a large maximum lift coefficient and a large zero-lift drag divergence Mach number, and generates a small pitching moment.

Abstract: A device for stabilizing yaw motion is provided for use on a helicopter having a main rotor rotatable about a main rotor axis, a power source, and a tail rotor boom with a longitudinal axis. The device includes a tail rotor and a gyroscopic mechanism. The tail rotor is mounted to the tail boom of a helicopter and is rotated about a tail rotor axis by the power source to generate a thrust force transverse to the tail boom and offset from the main rotor axis. The gyroscopic mechanism automatically varies the thrust force generated by the tail rotor to oppose yaw motions. The gyroscopic mechanism includes first and second variable pitch gyro arms extending along first and second gyro arm pitch axes, respectively, a support mechanism, and a pitch adjustor linkage.

Abstract: The present invention generally pertains to an agitating element for agitating low-to-medium-viscosity liquids. The agitating element comprises an inner main blade and an outer side blade, and the two blades are integrally constructed. The main blade is angled with respect to the rotation axis of the agitating element, while the side blade is angled with respect to the rotation plane of the agitating element. The agitating element according to the current invention enables high hydraulic efficiency especially in a vertical direction so as to accomplish thorough mixing of the material with a minimal energy input.

Abstract: An airfoil defining the shape of the blades of a vehicle engine-cooling fan assembly. The airfoil has a leading edge; a rounded, bulbous nose section adjacent the leading edge; a trailing edge; a curved pressure surface extending smoothly and without discontinuity from the nose section to the trailing edge; a curved suction surface extending smoothly and without discontinuity from the nose section to the trailing edge; and a thin aft section formed adjacent the trailing edge and between the pressure surface and the suction surface. The aft section has a camber at its location of maximum camber of between 5 and 12% of the chord of the airfoil.

Abstract: Airfoils for the blade of a wind turbine wherein each airfoil is characterized by a thickness in a range from 16%-24% and a maximum lift coefficient designed to be largely insensitive to roughness effects. The airfoils include a family of airfoils for a blade 15 to 25 meters in length, a family of airfoils for a blade 1 to 5 meters in length, and a family of airfoils for a blade 5 to 10 meters in length.

Abstract: This invention relates to a single crystal casting to be used under high stress, high temperature conditions up to about 2030.degree. F., characterized by an increased resistance to creep under such conditions. The casting is made from a nickel-based superalloy consisting essentially of the following elements in percent by weight: from 6.2 to 6.8 percent rhenium, from 1.8 to 2.5 percent chromium, from 1.5 to 2.5 percent cobalt, from 8 to 9 percent tantalum, from 3.5 to 6 percent tungsten, from 5.5 to 6.1 percent aluminum, from 0.1 to 0.5 percent titanium, from 0.01 to 0.1 percent columbium, from 0.25 to 0.60 percent molybdenum, from 0 to 0.05 percent hafnium, from 0 to 0.04 percent carbon, from 0 to 0.01 percent boron, from 0 to 0.01 percent yttrium, from 0 to 0.01 percent cerium, from 0 to 0.01 percent lanthanum, from 0 to 0.04 percent manganese, from 0 to 0.05 percent silicon, form 0 to 0.01 percent zirconium, from 0 to 0.001 percent sulfur, from 0 to 0.

Abstract: The present invention relates to a steam turbine comprising a rotor shaft integrating high and low pressure portions provided with blades at the final stage thereof having a length not less than 30 inches, wherein a steam temperature at first stage blades is 530.degree. C., a ratio (L/D) of a length (L) defined between bearings of the rotor shaft to a diameter (D) measured between the terminal ends of final stage blades is 1.4 to 2.3. This rotor shaft is composed of heat resisting steel containing by weight 0.15 to 0.4% C, not more than 0.1% Si, 0.05 to 0.25% Mn, 1.5 to 2.5% Ni, 0.8 to 2.5% Cr, 0.8 to 2.5% Mo and 0.15 to 0.35% V and, further, the heat resisting steel may contain at least one of Nb, Ta, W, Ti, Al, Zr, B, Ca, and rare earth elements.

Abstract: A vaned element of a fluid coupler such as a torque converter includes vanes having a depression extending from a leading surface area to a trailing edge of the vane. The depression avoids multiple surface layer changes which introduce turbulence to flow of fluid past the vane. The depression also forms reinforcing ribs in the form of raised walls which dimensionally stabilize the mounting tabs for the vane. In addition the vane construction is light weight since it permits the use of simple cross-sectionally shaped vanes while improving the speed capability of the torque converter and the strength of the vaned elements. The blade construction permits automated assembly techniques for the vaned elements.

Abstract: The present invention relates to a fan having a plurality of equiangularly spaced, radially extending blades. The spacing provided between adjacent blades is substantially constant along the entire radial length of the blade for increasing a blowing efficiency, while also allowing a mold separation operation along the axial direction during the formation of the fan using a mold. In a case where the blade is a sweep-forward blade, the number of the blades is seven or more and has a sweep-forward angle of the blades between 35 to 45 degrees. Finally, in case where an electric motor for rotating the fan is supported by stays, the number of stay member and the number of blades, which are not evenly dividable by each other, should satisfy a relationship of 2,000<x.times.y.times.Nf/60, where N.sub.f is a rotational speed of the fan.

Abstract: Horizontal axis, free yaw, self-regulated wind turbines which have strong, lightweight, fatigue resistant, fixed pitch, wood/GRE blades and exhibit superior performance a range of wind speeds. The blades are designed by employing defined inboard, midspan, and outboard airfoil profiles and interpolating the profiles between the defined profiles and from the latter to the root and the tip of the blades.

Abstract: A high output fan assembly for cooling the radiator of a motor vehicle. The fan assembly comprises a shaft, first and second fans, and a motor. The first fan includes a plurality of first blades, each of which has an inner portion attached to the shaft, while an outer hub is attached to an outer portion of at least one of the first blades. The second fan includes a plurality of second blades, each of which has an inner portion attached to the outer hub. The motor is drivingly connected to the shaft to drive the first and second fans at the same number of revolutions per minute. The fan assembly is situated either for pulling or for pushing air across the radiator and an air conditioning condenser of the motor vehicle.

Abstract: Heat transfer from the inside of a fan duct to the air is very good because the air in this region has a high velocity and is turbulent due to the rotation of the fan blades. Devices mounted on the outside of the fan duct can thus be cooled effectively. The inside surface of the duct can be modified to enhance the heat transfer as by grooving it deeply. The fan blade also can be modified to increase the air velocity and the turbulence. External fins can be added to the fan duct, and it can be shrouded so that a portion of the exit air passes through the fins back to the inlet. This decreases the mass of the exit air, for quieter operation.

Abstract: An improved nickel-based single crystal superalloy has both an extremely low sulphur content and a very low lanthanum, cerium, or lanthanum plus yttrium, or cerium plus yttrium, or content, whereby the amount while very low, is sufficient to react with the remaining available sulphur in the alloy and with sulphur from the fuel used in engine operation, such that the very thin, protective scale layer of aluminum oxide formed on the surfaces of the nickel-based alloy parts exposed to the very high temperatures incident in high efficiency turbine engines, will afford effective, long-life protection for the surfaces of these engine components, through the virtual elimination of spalling of the aluminum oxide scale during cyclic engine operations.

Abstract: A blade for use in an axial fan includes a plurality of vanes which each have a winglet formed on their front face to increase the air flow of the fan at a given blade velocity.

Abstract: An aircraft variable pitch propeller blade utilized in subsonic flight at relatively slow turning applications with relatively high power coefficients. The blade in plan form is tapered at both ends with the maximum chord approximate the mid station of the blade, the leading edge of the blade being swept behind the longitudinal axis of the blade near its tip and the trailing edge is convex and essentially straight from its maximum chord outward to the tip.

Abstract: A thick airfoil for the root region of the blade of a wind turbine. The airfoil has a thickness in a range from 24%-26% and a Reynolds number in a range from 1,000,000 to 1,800,000. The airfoil has a maximum lift coefficient of 1.4-1.6 that has minimum sensitivity to roughness effects.

Abstract: A fan blade includes a plate and a board fixed on the plate, an opening is formed in the fan blade for facilitating air circulation when the fan blade is operated. The plate and the board each includes a notch, the notches form the opening when the board is fixed on the plate.

Abstract: A novel rotatable mixing device having two intersecting mixing elements attached to an end of a rotatable shaft. The mixing elements intersect at 90.degree., have a generally U-shaped base portion, liner extensions of the legs of the U-shapes, and tip elements extending linearly from the end of the legs.

Abstract: A solar and wind energy generating system for mounting to a building comprises a wind generator system including at least an auger shaped air engaging member. A plurality of wind generators having air engaging vanes may also be provided. The wind generating system intercepts the flow of air currents to produce mechanical energy which is transformed into electrical energy by an electric generator. The air engaging surface of the wind generator vanes or the auger include a plurality of surface deviations. The surface deviations are arranged in at least one predetermined pattern such as a plurality of radially extending deviation sets. The solar generator includes a plurality of solar energy collectors. The wind generators may further include air engaging vanes with at least one transparent surface, and a plurality of solar energy collectors within a cavity formed in the vane, thus forming a combined solar and wind energy generator.

Abstract: An in-line fluid medium driven charging system includes a fluid medium driven generator disposed in a fluid medium directing tube. The fluid medium driven generator includes an auger shaped, fluid medium engaging member and is coupled to an electrical generator. Rotation of the auger shaped, fluid medium engaging member by intercepting a flow of a fluid medium causes rotation of the electrical generator, thereby generating electrical energy which recharges and assists in maintaining the life of a battery in a moving vehicle.

Abstract: The present invention relates to a steam turbine comprising a rotor shaft integrating high and low pressure portions provided with blades at the final stage thereof having a length not less than 30 inches, wherein a steam temperature at first stage blades is 530.degree. C., a ratio (L/D) of a length (L) defined between bearings of the rotor shaft to a diameter (D) measured between the terminal ends of final stage blades is 1.4 to 2.3. This rotor shaft is composed of heat resisting steel containing by weight 0.15 to 0.4% C, not more than 0.1% Si, 0.05 to 0.25% Mn, 1.5 to 2.5% Ni, 0.8 to 2.5% Cr, 0.8 to 2.5% Mo and 0.15 to 0.35% V and, further, the heat resisting steel may contain at least one of Nb, Ta, W, Ti, Al, Zr, B, Ca, and rare earth elements.

Abstract: A solar venturi turbine includes an upwardly oriented venturi tube supported by a venturi support skirt. The venturi tube includes a tapered thermopane glass enclosure which allows sunlight to project therethrough and impinge on a tapered centrifugal fan fronting the thermopane enclosure and mounted within the venturi tube. The fan vanes are configured to spiral radially outwardly in a clockwise direction when viewing the fan in top plan. The fan vanes have a cross-sectional profile approximating an inverted L. Located above the centrifugal fan in the neck of the venturi tube is a high velocity fan. A high pressure compressor is mounted above the high velocity fan, and finally a turbine is mounted above the high pressure compressor. A venturi tube outlet flares outwardly directly above the turbine and is mounted to the venturi tube. The turbine is connected to a shaft to drive an electrical generator thereby producing electricity.

Abstract: A turbine blade, preferably used in the low pressure stages of a steam turbine, is formed from a basic titanium alloy. Near the blade tip, it has a region, including the blade leading edge with a surface of a material which is more resistant to erosion than the basic titanium alloy.This turbine blade should be simple to manufacture and should have a long life even under difficult operating conditions.This is achieved in that the region including the blade leading edge has a protective layer formed by surface treatment of the basic titanium alloy by means of a high-power energy source, such as, in particular, a laser.

Abstract: A rotary-wing blade of a rotary-wing aircraft has an airfoil section which has an asymmetrical region of positive camber from its leading edge to its approximately 30-percent chord length point and an essentially symmetrical airfoil region from its 30-percent chord point to approximately its 90-percent chord length point. The region aft of the 90-percent chord point can be optionally curved or reflexed upward or downward to a limited degree. This blade has a large lift coefficient and a small pitching moment and is readily adaptable to meet various design conditions of lift coefficient and pitching moment.

Abstract: The variation in the length of the chord L and the variation of the offset Y'f of the aerodynamic center are such that the leading edge (5) and the trailing edge (6) of the blade (1), along its longitudinal extent, exhibit no break, the overall aerodynamic center of said blade Being substantially situated on the pitch variation axis.

Abstract: A method for producing a profiled part from a blank, wherein the cross-sectional profile of the part to be produced differs in some portions both quantitatively and qualitatively from the cross-sectional profile of the blank, so that different amounts of material must be removed between a starting profile of the blank and a desired final profile of the part includes pre-shaping and finish-grinding the part to be produced in one chucking position with at least one profiled grinding wheel. The blank is translated and rotated relative to the at least one profiled grinding wheel during the pre-shaping step for giving the blank approximately a desired profile. The finish-grinding step is performed at least partially after the pre-shaping step for smoothing surfaces and producing the final profile to accurate dimensions. A turbomachine blade, an intermediate product for the turbomachine blade and a method of manufacturing the interim product are also provided.

Abstract: A static efficiency enhancer for an axial fan having a hub and a plurality of blades extending radially outward from the hub, the enhancer comprising a plurality of airfoils connected to the hub and extending outwardly therefrom to provide additional air velocity at the periphery of the hub.

Abstract: A stirring blade unit includes a plurality of main blade bodies radially projected from the outer periphery of a boss and auxiliary blade bodies respectively provided at tip portions of the main blade bodies in a manner so as to be downwardly projected. With this arrangement, it is possible to prevent swinging of the rotational shaft, the fabrication and mounting of the auxiliary blade bodies is made easier, material costs are reduced, and the mounting space required is reduced.

Abstract: A high solidity impeller has a number of equally spaced blades, each formed from a sheet that is bent to a continuous cylindrical curve along a roll axis that lags (in the rotation direction) the radius at which the blade is attached to the shaft. The blade also is pitched by rotation around the radius, i.e., the leading edge is raised in the flow direction and the trailing edge is lowered. The roll axis preferably lags the radius by 45.degree.. This arrangement provides a good approximation of a true hydrofoil and results in an excellent reconciliation between interests of material and manufacturing cost vs. pumping efficiency. The blades can be formed by rolling asymmetrically shaped contours cut from a flat sheet. A base member and preferably a connecting arm couple each blade to the shaft. The base member abuts the rolled contour along surfaces referenced to the roll axis, which surfaces can be used as a reference for rolling.

Abstract: An ultra-thin low noise axial flow fan is provided for office automation machine. The center line along the blade from its root portion to its tip portion is circular arc form and it is perpendicular to the central hub. The leading edge skew angle at the tip portion of the blade is 47 degrees. The blade angle of each blade ranges from 57 to 63 degrees, which is first directly proportional to the radius of the blade and then inversely proportional to the radius of the blade from the root portion to the tip portion of the blade. The pitch-chord ratio of each blade is inversely proportional to the radius of the blade from the root port to the tip portion of the blade. The blade of the fan thereby generates high air flow and high pressure, and has advantages of low noise and ultra-thin outer casing.

Abstract: An auger shaped, fluid medium engaging member is disclosed which includes a helically or auger shaped outer region disposed about a longitudinal axis which passes through a central region of the member. The auger shaped outer region establishes at least one auger or helically shaped fluid medium engaging surface, which intercepts the flow of a fluid medium such as air or water, for effecting rotational movement of the fluid medium engaging member about its longitudinal axis. The auger shaped, fluid medium engaging member may be coupled to an electrical generator, for generating electrical energy upon rotational movement.

Abstract: An axial flow fan device capable of reducing the stagnant flow at the root area of blades. These blades 18 are arranged so that they extend radially from a boss portion 14 so that they are circumferentially spaced along the circumference of the boss portion 14. Each of the blades 18 has an arc shaped cross section having a bending ratio value .alpha., that is a ratio of the bending height h of the arc shape to the length l of the chord of the arc shape. The value of the bending ratio rapidly increases from the middle portion of the blade to the root portion. The value of the bending ratio at the root portion is about 12%.

Abstract: The hub is conically formed, and the vanes attached thereto are given a substantially radial direction; consequently, the turning axes of the vanes are situated in the center of the vanes, substantially bisecting the center of the vane chords. The turning axes are perpendicular to the impeller shaft.

Abstract: An improvement to forwardly skewed axial fans whereby blade camber and rake are coordinated with skew. The blades are characterized in that a line defined by the points of maximum chordwise camber (f.sub.max) as a function of changing radial position (r) is on the leading edge side of the mid-chord line (M.sub.CL) at values of r toward the root of the blade, and is less forwardly skewed than the leading edge (LE), the mid-chord line (M.sub.CL), and the trailing edge (TE) of said blade; the blade is raked forwardly so that the trailing edge of the blade tip is axially forward of the trailing edge at the blade root; rake (k) increases monotonically as radial position r increases from 0.75R to 1.0R, R being the fan radius; the blade has a relatively large pitch ratio (P/D); and rake is corrected to reflect the chordwise position of maximum camber.

Abstract: An apparatus for deagglomerating powder in a mixture of liquid and powder which contains a mixing tank, an agitator disposed within the mixing tank, and a baffle. The agitator disk is circular, has an diameter of from about 6 to about 40 inches, and contains a multiplicity of compound teeth radially and removably attached to its perimeter. Each of the compound teeth is comprised of a substrate to which is attached a front plate, a top plate, and a bottom plate; each of these plates preferably consists of a ceramic material, such as tungsten carbide.

Abstract: The invention is directed to an impeller of an axial-flow type fan, in particular for appliances for drying and dressing hair, in which adjacent blades overlap each other completely over the radial extent of the blades in the edge regions of the blades. To ensure that the injection-molded impeller is capable of being ejected from the mold, the angle of opening is required to be smaller than or equal to the angle of rotation.

Abstract: A first hollow titanium MMC driveshaft portion is diffusion bonded to a third portion which in turn is fastened to a second superalloy portion via circumferentially positioned pins which are tightly fitted within aligned holed formed in the second and third driveshaft portions. The first, second and third portions are concentric with respect to the driveshaft centerline, and the pins are retained by means of a concentric retaining cylinder.

Abstract: A water jet propelled boat is equipped with a water intake opening, a water jet outlet, and with a mixed flow type impeller, where the above mentioned water intake opening and the above mentioned water jet outlet are connected by a water passage with the impeller in the middle of the water passage, and where the operation of the impeller causes water to be drawn into the water intake opening and expelled through the above mentioned water outlet to propel the boat. The impeller structure is such that a boss section of the impeller has a plurality fins affixed to it, the outside edges of the above mentioned spiral fins are roughly parallel to the axial center of the above mentioned boss, and, the leading and the trailing edges of the fins, with respect to the axial center of the above described boss, slant down toward the above mentioned water outlet opening. At the same time relative speeds, the invention allows a smaller diameter fin unit and, at speeds of 4,000 rpm and over, it offers improved efficiency.

Abstract: A variable diameter rotor for a tilt rotor aircraft has an inboard section having a linear twist from a root end to an outboard end thereof, and an outboard section telescoped over the inboard section which additionally has a linear twist from a root end to an outboard end thereof. The outboard section is disposed at an offset of about 4.degree. to 15.degree. relative to the inboard section to provide a step wise change in twist angle when in the extended condition, such that the rotor when operated in the helicopter mode, can be operated at high blade pitch angles without premature stalling along the inboard airfoil surfaces This allows efficient operation at high thrust coefficient/solidarity ratios. Optionally, the trailing edge of the outboard section is rotated along the aft 30% of chord of the airfoil section to provide an equivalent twist increase in the offset at the transition between the blade sections.

Abstract: A weed resistant boat propeller is disclosed. The propeller includes a generally circular hub that is adapted for mounting to and being rotatably driven by a boat motor. There are a plurality of blades mounted to a circumferential surface of the hub and extending therefrom in a spiral configuration. Each blade includes a curved leading edge that has an arc dy/dx<1 for the entire length of the leading edge.

Abstract: A fixed pitch propeller has blades that are not solely dependent on the blade angle dictated by the helical path of the blade tip. An outboard portion of the blade has a range of blade angles that are relatively flat to operate most efficiently at lower aircraft speeds.

Abstract: A low cost assembly and method for assembly of a fan having a hub, a spider with arms and blades attached to the arms is provided. The spider is arc welded to the hub and the blades are projection welded to the arms. The blades have a root, a tip, and an ear. The width or chord of the blade decreases from the root to the ear and then increases from the ear to the tip. The blade has an air foil shape defined by the arcs of two circles. The radii of the circles and, thus the profile of the blade, change as a function of the cord length and the camber of the blade. The blades have a pitch angle which decreases from the root to the ear. The spider arms are formed to match the pitch and are rotated slightly with respect to the horizontal. The result is a highly efficient, low cost fan blade assembly construction.

Abstract: A vehicular AC generator comprising a stator supported by a front bracket and a rear bracket; a rotor fixed to a rotating shaft supported by the front bracket and the rear bracket through bearings, provided with magnetic pole cores wherein a plurality of pairs of magnetic poles are formed in the circumferential direction, retaining an excitation coil; a pair of fans provided at a front end and a rear end of the magnetic pole cores; a plurality of inlet openings provided at end faces of the front bracket and the rear bracket; a plurality of outlet openings provided at peripheral portions of the front bracket and the rear bracket; and fans for cooling inside of the vehicular AC generator by circulating air therein by rotation of the rotor; wherein the fans each is fixed with a side plate at ends of blades thereof and at least in a front side fan of the both fans, a difference between an inner radius of the side plate and an inner radius of the inlet opening of the corresponding front bracket is larger than a wi

Abstract: A water pump including a rotating impeller is located between the two filter chambers, and pumps water from the aquarium tank, via the inlet conduit, into a corridor which communicates with the two filter chambers. The impeller is constructed with relatively closely spaced radially extending blades, each of which is formed of a circular disk. A base edge, or chord, of each blade is inclined upon a frustoconical surface of a central hub of the impeller.