Abstract: An engine cooling system include a ring-type cooling fan (10) that includes a central hub (12), a plurality of blades (11) projecting radially from the hub (12) and an outer circumferential ring (15) connected to the blade tips (17). In one aspect of the invention, the outer ring (15) includes a flared rim (28) at the outlet side (10b) of the fan (10) that improves the stackability and stability of multiple fans. In another aspect of the invention, each of the blades (11) includes a support vane (30) defined on the rear face (25) of the blade (11). The support vane (30) is curved to follow the curvature of the airflow (F) across the back (25) of the fan blades (11). Each support vane (30) originates at the blade root (19) and terminates at the trailing edge (11b) of the blade in the first half of the blade length. The support vanes (30) provide first mode stiffness for the fan (10). In certain embodiments, a support ring (35) is defined at the central hub (12) inboard of the support vanes (30).

Abstract: A multistage oil-well pump for pumping out formation fluid has a higher pressure head at low delivery rates and higher stability of performance when gas pockets are present in the medium being transferred. To this end, in the stage of a multistage submersible pump, having an impeller which comprises a driving disk and a driven disk with vanes interposed therebetween, and a guide vane assembly with shaped vanes whose leading edges extend beyond the outside diameter of the external lid of the guide vane assembly, triangular cells are provided at the periphery of the impeller driving disk on the lateral surface thereof, which cells are open towards the disk outer side, and a side annular channel is provided on the surface of the external lid of the guide vane assembly, which surface mates with the impeller. The surface of the lateral annular channel is paced apart from the upper edge of the impeller cells at least 0.3 times the depth of the latter, and the radial length of the cells is not in excess of 0.

Abstract: Turbine is added to the spinner of a propeller to provide a contribution to propulsive thrust of the propeller. The turbine comprises a group of turbine modules, which are mounted on the periphery of the spinner between root portions of the propeller blades. Each module includes a curved row of angulated turbine vanes held between a curved base plate and a curved outer plate.

Abstract: An apparatus comprising a longitudinally extending housing having a fluid inlet port and a fluid outlet port; a plurality of spaced apart members rotatably mounted in the housing to transmit motive force between fluid introduced through the fluid inlet port and the spaced apart members, the spaced apart members having an upstream end and a downstream end; and, at least one fan member positioned in series with the spaced apart members.

Abstract: An apparatus and method of cooling a work machine is disclosed. A work machine includes a frame, a plurality of ground engaging devices, an operator compartment, a work implement, an engine, and a cooling system. The cooling system includes a radiator, a rotating fan assembly, a rotating deflector, and a means for rotating the fan and the deflector. The rotating fan assembly includes a fan and is for drawing air in a first direction across the radiator. The deflector has a concave surface with a plurality of projections extending therefrom and adapted to draw air in a second direction as the deflector is rotated.

Abstract: An improved windmill includes a conical rotor unit, a frame for supporting the conical rotor unit and a base for supporting the frame. The conical rotor unit has a conical rotor with a plurality of spaced curved blades disposed thereon and a plurality of spaced slant blades located at an outer rim of the conical rotor. The conical rotor has small wind resistance and may rotate under low speed wind to generate rotor rotation. The frame is rotationable about the base to enable the conical rotor to capture wind from different directions. The conical rotor is heavier than conventional windmill rotor and may serve as a fly wheel to store kinetic energy for the windmill to produce steady rotation under different wind speed for a long period of time.

Abstract: A variable pitch fan in which the pitch of the fan blades is varied under control of a controller according to the speed of the fan. The controller is programmed to respond to increased fan speed by decreasing pitch of the fan blades. The variable pitch fan has a piston extending axially from a main shaft, about which main shaft a fan blade hub rotates. A pitch shifter is mounted on a cylinder, which itself is mounted on the piston. The pitch shifter is actuated by hydraulic fluid supplied through the main shaft to the cylinder. The piston is preferably axially stationary in relation to the main shaft. The cylinder is secured against rotational movement by at least one guide pin passing into the main shaft. Grease for the pitch shifter is supplied through the guide pin. One guide pin may be used for grease supply, while another may be used for excess grease return.

Abstract: A propeller used to interact with a fluid to either move the fluid, e.g., a fan or generate thrust for propulsion, e.g., for an aircraft or boat. The propeller is characterized by at least first and second planar blades configured for mounting on a propeller shaft. Each of the planar blades defines a periphery including (1) a trailing edge lying substantially in a common plane oriented perpendicular to the propeller shaft and (2) a leading edge inclined at an angle of A.degree. relative to the common plane so that the midpoint of the leading edge is axially displaced, relative to the propeller shaft, from the midpoint of the trailing edge.

Abstract: This invention provides a compact, flat axial fan which is not limited by the shape of an incorporated rotor magnet and ensures a sufficiently large air flow and wind pressure, wherein the slide (under) piece of a mold that forms the under-molding portions of the vanes of the impeller of the axial fan is pulled out while being twisted (while performing a helical motion) in the direction of central axis of the base portion of the impeller, so that the mold can be formed simple to realize a multi-cavity mold, and the vanes can be formed into an ideal form by setting vane angles depending on different rotating peripheral velocities of the vanes, so that air can be supplied form the under-molding portions of the vanes to the vanes on the outer circumferential side during rotation of the impeller and a method of manufacturing an impeller for the axial fan.

Abstract: A turbine 400 has a central duct 410 which accelerates fluid passing through it and a blade configuration which retards the flow of fluid near the tips of the turbine. This structure results in a vortex having a higher fluid pressure behind the tips of the turbine blades 408 and a lower fluid pressure behind the duct. In the present invention, this vortex is enhanced by (1) an increased acceleration of the fluid passing through the duct 410 and a deceleration of the fluid passing through the blades 408; and/or (2) by a fluid redirection device 850 for directing the fluid passing through the duct towards the outer diameter of the turbine.

Abstract: A propulsion engine fan incorporates two sets of blades with recessed portions formed along the surface of each blade. One set of blades has a higher resonant frequency than the other set of blades. In an illustrative embodiment of the invention, first and second blade groups each comprise an airfoil portion forming a surface for directing the flow of a working fluid through the engine. Each of the first group of blades has first and second recessed regions formed from the blade surface and has a first resonant frequency. Each of the second group of blades has third and fourth recessed regions formed from the blade surface and has a second resonant frequency less than the first resonant frequency. The first and second group blades are arranged in an alternating pattern along the rotor portion of the fan.

Abstract: An impeller shell 40a of a torque converter includes a main portion 41, a connection portion 42 and a stepped portion 43. The main portion 41 has a curved inner peripheral surface 41a carrying impeller blades, and is opposed to a turbine 5. The connection portion 42 has a cylindrical form larger in diameter than an outer periphery of the inner peripheral surface 41a, and is fixed to a front cover 3. The stepped portion 43 couples an end of the main portion 41 near an engine to an end of the connection portion 42 near a transmission. A corner portion formed of the inner peripheral surface 41a and a surface 43a near the engine has a radius set to 4 mm or less by preliminary forming by a press and subsequent finish forming by a press.

Abstract: A blower wheel for an electric motor driven fan includes an impeller in concentric alignment with a back plate. The back plate has an interior sleeve with a plurality of inwardly directed ribs that define a motor receiving circle in which a motor is disposed. Gaps between the ribs form a cooling shroud about a motor rotor such that when the blower wheel is rotated the plurality of ribs force high velocity air through the gaps and over the outside surface of the rotor. The blower also includes a shroud positioned about the blower wheel and motor having inlet and outlet air openings.

Abstract: A method for designing a mistuned rotor with improved stability and forced response.

Abstract: A ceiling fan includes an outer housing and a cap secured on top of the outer housing. A shaft is secured to the cap and a motor is disposed in the outer housing and secured to the shaft for driving a number of fan blades. An inner housing is rotatably disposed in the outer housing and includes a center sleeve rotatably engaged on the shaft for allowing the inner housing to be rotated about the shaft and includes a number of blade members. The fan blades may generate a circulating wind through the inner housing in order to actuate the blade members.

Abstract: A radiator fan of an internal combustion engine in a motor vehicle is provided in the form of a one piece injection molded combination of radial fan blades and axial fan blades supported on a conical annulus for increasing air pressure flow across the radiator. The conical annulus has the same axis as that of the hub of the fan. The radial blades connect the interior face of the conical annulus to the hub of the fan. The axial blades are connected to the exterior surface of the conical annulus and extend radially outward. The fan is coupled to the engine through a fluid friction clutch. An air guide ring is positioned upstream of the fan for deflecting axial incoming air flow to help improving efficiency of the fan.

Abstract: A drainage pump has a pump body, a vane, a ring, and a circumferential wall. The pump has a cylindrical small vane pump chamber and a large vane pump chamber extending from and communicating with the small vane pump chamber. A suction inlet communicates with the small vane pump chamber and a discharge outlet communicates with the large vane pump chamber. A chamber slope portion is formed between the small vane pump chamber and the large vane pump chamber. The vane is adapted to be driven by a motor and is rotatably mounted to the pump body. The vane includes a large vane portion received in the large vane pump chamber and a small vane portion extending from the large vane and received in the small vane pump chamber. The small vane portion and the large vane portion rotate together when driven by the motor. A vane slope portion is formed between the large vane portion and the small vane portion. The ring has a central opening, positioned between the large vane portion and the small vane portion.

Abstract: A stirring element (10), especially a gasing stirring element for stirring liquids and introducing a gas, preferably air, to the liquids. The stirring element has a hub (12) for attachment to a stirring shaft and a support disk (14) joined to the hub (12), a plurality of stirring blades (16) being attached to a peripheral edge of the support disk (14). To achieve a low output power coefficient, each stirring blade (16) is made of a wedge-shape that is directed in the direction of rotary motion of the stirring element (10). Preferably, radially inner end sections (22, 24) of two sides (18, 20) of the stirring blade (16) are angled relative to sides (18, 20) outwardly with reference to the direction of rotary motion of the stirring element (10). The stirring element (10) simplifies gas feed and prevents clogs. By providing the support disk (14) with a conical shape having a ring of teeth (26) on its outer edge, a uniform distribution and good dispersion of the gas bubbles is obtainable.

Abstract: A main rotor is provided for use on a model helicopter. The main rotor includes rotor blades having an inboard section and an outboard section. The inboard section includes a higher camber, thin, wide airfoils, and greater pitch and camber relative to the outboard section. The outboard section includes an average chord length that is less than the chord length of the inboard section, The rotor blades also include a blade body that is semiflexible to bend during a crash landing of the model helicopter.

Abstract: A fan blade assembly having a plurality of arranged about a central hub having an axis of rotation, the blades projecting from the hub radially outward from the axis of rotation. Each blade has a blade length, with a proximal end attached to the central hub and a distal end radially outward from the central hub. The assembly has at least one vane member with a plurality of vane segments, each vane segment joining a first blade with an adjacent second blade at a place along the blade length located radially inward from the distal end and radially outward from the proximal end of the blades. The assembly further having a plurality of recesses in the central hub adapted to receive the proximal end of blades of an adjacent blade assembly to permit stacking of like assemblies.

Abstract: An apparatus for tensioning a subsurface float line and the like during doyment of the line and thereafter includes a capstan rotatably mounted and located in a liquid medium, the capstan having a bore extending from one end of the capstan to the other end, the bore including a plurality of pump blades for moving the liquid through the bore when the capstan is rotated, the capstan also including turbine blades located around the circumference of the capstan and adjacent both ends of the capstan, the capstan also including a circular surface interposed between the turbine blades for communicating with the line to be tensioned. The pump and turbine blades do work when the capstan is rotated thereby creating a counter rotational (drag) force that tensions the line during and after deployment.

Abstract: A pump body 10 of a drainage pump 1A comprises a pump chamber 12, inlet 15, and outlet 17. A rotary vane 300 mounted in the pump body 10 is coupled to a motor mounted above the pump body 10, and comprises a shaft 310 and four large-radial blades 320. Formed below the large-radial blades 320 are small-radial blades 350 to make a liquid at the inlet rise. Lower edges of the large-radial blades 320 are connected together by a disk 350 having an opening at the center and interceptively dividing the surface of the liquid rising from the inlet. Thus the amount of the liquid in contact with the large-radial blades 320 above the disk 350 decreases, and the load to the rotary vane decreases. At the same time, bubbles, noise and vibrations caused by bubbles also decrease. By surrounding the outer circumference of the large-radial blades 320 with a ring member, return water W5 moving back from the outlet 17 when the pump stops is damped by the wall member 360 and returns smoothly to the inlet 15.

Abstract: An impeller is for separating a conveyed stream of material. The impeller has a central rotatable hub with a plurality of blades extending radially therefrom. The hub and blades form a number of generally wedge-shaped material receiving spaces within the impeller. One set of spaces has a baffle arrangement which is configured to direct material in this set outwardly from the impeller on the upstream side of the baffle arrangement. Another set of spaces has a guide arrangement which is configured to guide the material in this set of spaces outwardly from the impeller on the downstream side of the baffle arrangement. The impeller is particularly useful for separating streams of particulates, such as wood chips, compressed shavings, or the like.

Abstract: An impeller for a submersible radial pump has an impeller disk which is formed with a pair of blades on a side thereof opposite the boss. The leading end of one of the blades is thicker than the leading end of the other blade to reduce the possibility that pieces of fabric or the like will hang up on the blades in operation of the pump.

Abstract: A pump body 10 of a drainage pump 1A comprises a pump chamber 12, inlet 15, and outlet 17. A rotary vane 300 mounted in the pump body 10 is coupled to a motor mounted above the pump body 10, and comprises a shaft 310 and four large-radial blades 320. Formed below the large-radial blades 320 are small-radial blades 350 to make a liquid at the inlet rise. Lower edges of the large-radial blades 320 are connected together by a disk 350 having an opening at the center and interceptively dividing the surface of the liquid rising from the inlet. Thus the amount of the liquid in contact with the large-radial blades 320 above the disk 350 decreases, and the load to the rotary vane decreases. At the same time, bubbles, noise and vibrations caused by bubbles also decrease. By surrounding the outer circumference of the large-radial blades 320 with a ring member, return water W5 moving back from the outlet 17 when the pump stops is damped by the wall member 360 and returns smoothly to the inlet 15.

Abstract: A drainage pump 1 comprises a pump housing 40 defining a suction inlet 42, a pumping chamber 44 and a delivery outlet 46, and a cover 32. An impeller 50 accommodated in the pump housing is driven by a motor 10. The impeller 50 comprises a shaft 52 coupled to an output shaft of the motor 10, large-radius vanes 60 in form of flat plates radially extending from the shaft 52, and small-radius vanes 54 continuous from the large-radius vanes 60. Outer circumferential edges of the large-radius vanes 60 are connected by a cylindrical wall member 64, and outer circumferential parts of lower edges of the large-radius vanes 60 are connected by an annular member 62. The cylindrical wall member 64 has a rounded portion 70 at its upper end, and the small-radius vanes 54 also have rounded portions 57 at their lower ends.

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: An auger-tube pump mixing device for mixing materials with large density differences while maintaining low stirring RPM and low power consumption. The mixing device minimizes the formation of vortexes and minimizes the incorporation of small bubbles in the liquid during mixing. By avoiding the creation of a vortex the device provides efficient stirring of full containers without spillage over the edge. Also, the device solves the problem of effective mixing in vessels where the liquid height is large compared to the diameter. Because of the gentle stirring or mixing by the device, it has application for biomedical uses where cell damage is to be avoided.

Abstract: A mixed-flow impeller pump, which may be used, for example, as a primary pump for circulating sodium as the primary coolant in a fast nuclear reactor, comprises an impeller with evenly-spaced blades. Some of the blades, which are symmetrically disposed around the axis of rotation of the impeller, extend beyond the ends of the other blades towards the suction side of the pump to form an inducer. The channels defined between the extensions of the extended blades follow helical paths parallel to the axis of rotation. The leading edges of the unextended blades are interposed between the extended blades in the region of divergence of flow from the axis of rotation. The provision of the inducer reduces the risk of cavitation in the pump, which could cause rapid wear of the impeller.

Abstract: An axial flow fan comprising: a cental hub rotatable on an axis; and a plurality of blades extending from the hub, each of the blades comprising a root portion adjacent to the hub, and terminating in a tip portion, the root portions of the blades being approximately evenly spaced around the hub; wherein each of the blades exhibits a curvature from the root portion of the blade to the blade's tip portion, the curvature being in a plane that is perpendicular to the axis on which the fan rotates; and wherein the curvature differs between at least two of the blades, such that the distance between the tip portions of at least wo sets of adjacent blades is unequal. The invention therefore achieves the advantage of having uneven blade spacing near the tips while maintaining high solidity near the hub, where the blade spacing is even. Uneven blade spacing near the tips reduces noise. Having high solidity near the hub, where non-dimensional loading is highest, maintains higher dynamic performance.

Abstract: An impeller comprises a central hub part, and a plurality of vanes extending from the central hb part, the plurality of vanes including two first neighboring vanes having a predetermined construction and at least one second vane located between the first vanes and having a construction which is different from the construction of the first vanes.

Abstract: Within a rotor blade row of a steam turbine, rotor blades having one resonant frequency alternate with rotor blades having a second, different resonant frequency. The two different resonant frequencies are achieved by profiling the tips of every other rotor blade.

Abstract: Wind energy conversion apparatus comprises vertical endless travelling belt means and a plurality of inter-spaced hydrodynamic foil members mounted thereon. Passage of fluid, i.e. wind, over the foil members creates lift forces thereon serving to drive the endless belt means about belt circulating parts. The foil members may have a fixed angle of incidence with respect to the belt runs i.e. between the circulating parts at the top and bottom of the endless belt means; or they may be of variable pitch. In one embodiment the belt means comprises two separate endless belts the foils are carried on arms which have pivotal connections with both belts; and a tension spring connects the belts. A belt circulating part, the lower wheel is coupled to a rotary load, an electric generator. Aerodynamic lift on the foils drives the belt and, by the spring connection, the belt and the rotary load. The foil angle of incidence is determined by the lift and the spring reaction.

Abstract: A fan having a plurality of blades where a selected number of the blades are arranged with their leading faces disposed parallel to the axis of rotation of the fan. The remaining blades are arranged with their leading faces at angles to the axis of rotation such that the air streams from the two types of blades intersect to create turbulent flow. The fan's heat transfer ability is increased and the air flow from the fan is dispersed over a wider area than with conventional fans.

Abstract: An airscrew for propelling an aircraft has a hub, a jacket and a plurality of propeller blades secured by blade necks to the hub. These blade necks are secured to the hub with symmetric or equal angular spacings around the hub between neighboring radial blade neck axes. Each propeller blade has a longitudinal axis. At least certain of these longitudinal blade axes extend at different sweep angles relative to the respective radial blade neck axis. When the sweep angle is positive the respective sweep of the blade is a positive sweepback with a trailing sweep of the respective blade relative to a rotational direction of the airscrew. When the sweep angle is negative the respective sweep of the blade is a negative sweep forward with a leading sweep of the respective blade relative to a rotational direction of the airscrew. These differing sweep angles achieve a substantial noise reduction compared to conventional airscrews having a completely symmetrical construction.

Abstract: A fan includes a plurality of circumferentially spaced blades fixed on an end of a motor shaft. Each of the blades includes a series of radially interconnected oblique planes which are all inclined circumferentially of the motor shaft in a direction so as to press or suck fluid when the motor shaft rotates. The outer one of any adjacent two of the oblique planes extends radially outwardly from the inner adjacent plane toward the other end of the motor shaft at an angle of less than 90 degrees so that the blades are generally L-shaped. The outermost one of the oblique planes of each of the blades is generally parallel to the motor shaft. Thereby, fluid can be pressed or sucked axially and radially of the motor shaft to establish a generally semi-spherical fluid flow field.

Abstract: The invention relates to a boat propeller unit with double, counter-rotating propellers. The forward propeller is designed to function without cavitation, while the after-propeller is optimally cavitating by being made cupped and with a blade width of between 60% and 75% of the blade width of the forward propeller.

Abstract: A ceiling fan having a plurality of fan blades which generate axial air flow and which include vane portions positioned angularly to the surface of the blades which direct air flow radially from the blades to increase the range of circulation of the air in a room, to establish a favorable pressure gradient for the axial flow, to increase the efficiency of the ceiling fan and to create a more desirable air flow distribution under the ceiling fan than do conventional ceiling fans.

Abstract: A wind turbine assembly includes a wind turbine 18 mounted in a head 16, the wind turbine driving, via a gear box 22, an air compressor 24, 25, the inlet 26 of which is arranged to withdraw air from the vicinity of the blades of the turbine 18 to improve the efficiency of the turbine. The compressed air may be fed via a duct 12 for example to a reservoir or to a motor or gas turbine, for example, to drive a generator.

Abstract: A pump of centrifugal type having both an impeller unit and an expeller unit coupled together for effecting frictionless hydraulic seal during operation within an appropriate housing therefor. By providing an expeller unit separate from the impeller unit, the portions of the impeller unit which wear fastest can be replaced as needed without the need for replacing other components as soon. This greatly reduces the cost of maintenance and replacement. Also, rotor vanes and stacked separator discs in a preferred embodiment provide for greatly reduced manufacturing and assembly costs, and yet allow the flexibility of easy replacement of only parts that are severely worn or corroded as needed. Both the method of making and the method of assembly are encompassed by this invention.Furthermore, all of the component elements are preferably rubber covered for maximum protection against abrasion and corrosive action of the liquid being pumped.

Abstract: A driving arrangement for a watercraft includes a propeller and a freely pivoted guide wheel arranged subsequently to the propeller. The guide wheel which has a higher blade number and a smaller rotational speed than the propeller is provided with sectionized blades. One segment of each blade is propeller blade-like and extends outside the stream generated by the propeller and the other segment is turbine bucket-like and extends within the propeller stream. Upon equal rotational speed of the propeller and the guide wheel, the pitch of the respective segments is such that the pitch of the one segment which is outside the propeller stream is essentially constant in radial direction while the pitch of the other segment steadily increases radially from the one segment towards the hub on which the guide blade is arranged.

Abstract: A method for directing a desired amount of gas below the liquid surface in a solution reactor, to mix the bubbles as effectively as possible with a suspension of a pulverous solid and a liquid, and to produce in the mixed gas-liquid-solid suspension a strong, suspension-maintaining flow field which is downward in the center of the reactor and upward along its sides, is disclosed. A so-called gls-mixer according to the invention consists of a circular plate fitted at the lower end of a rotating shaft suspended by its upper end, vertical dispersion blades situated radially at the edges of the circular plate, and baffles attached to the dispersion blades by means of arms. An upwardly directed gas-feeding conduit is fitted at the bottom of the reactor, and from this conduit the gas jet discharges to the center point of the circular plate.

Abstract: Each radially extending blade (12) of a wind motor is fitted near its tip with an auxiliary vane (13) which can result in an increase of efficiency. Different from known devices each auxiliary vane (13) is placed with respect to the blade (12) so that the low-pressure peaks of the vanes (13) and the blades (12) are separated one from the other rotation by more than 0.3-times the length of the largest chord. Preferably the auxiliary vanes (13) are designed so that its center of gravity lies in front of the blade (12). The lengthwise axis of the auxiliary vanes (13) makes an angle .alpha. lying between 10.degree. and 40.degree. with the rotational axis (11) of the blades (12), the lateral edges (17) of the vanes (13) is bevelled rearward with respect to the leading edge (16) under an angle .beta. from 15.degree. to 45.degree. and the surfaces meeting surfaces meeting at the lateral edges (17) make an angle .UPSILON. which approaches zero value.

Abstract: A circulating fan for annealing furnaces of the type having a centrally apertured circular base plate, a plurality of circumferentially spaced radially disposed main fan blades, mounted on one side of said base plate having a forwardly inclined concave scoop portion, one or more interceptor blades inclined in the same direction as the scoop and disposed between a pair of adjacent said main fan blades. A circular flat outer upper peripheral ring to which said main and interceptor blades are secured.

Abstract: In a propeller for use in a ship of the type comprising 4 or more even number blades, at least one of two adjacent blades is inclined forwardly or rearwardly or one inclined forwardly and the other rearwardly so as to make different the rake angles of the two blades. The pitch angle of the rearwardly inclined blade is made larger than that of the forwardly inclined blade. With this construction the mutual interference between adjacent blades is efficiently utilized to prevent decrease in the efficiency even when operating conditions and the diameter of the propeller vary.

Abstract: An improved ceiling fan including a housing to be hung down from a ceiling and a motor having a stationary stator and a rotatable rotor which rotates a number of blades to create a stream of air. One or more electrical heating elements are positioned within the housing and around the outside of the rotor. A radial fan arrangement generates a flow of air through the housing, over the heating elements, and out into the stream of air created by the rotation of the blades.

Abstract: Apparatus for converting the energy of the wind into mechanical energy for use in the generation of electricity comprises an upstanding column a fan which is freely rotatably mounted on the column and which comprises circumferentially spaced, radially extending blades and, supported by and freely rotatable about the axis of the column, a turbine which surrounds and is radially spaced from the column and which comprises circumferentially spaced blades extending lengthwise with respect to the column. Preferably, an annular body is supported by the column and has an upper surface of such a shape as to encourage laminar flow of the wind over its surface. Preferably, also, over an upper part of its length immediately below the fan the column has circumferentially spaced, helically extending fins 4 defining passages wind being caused to flow upwardly within the passages to form a vortex.

Abstract: A horizontal axis windmill in which there is employed a conventional propeller mounted at one end of a fuselage housing a generator, and there is also located in the fuselage an induction fan. The fan functions to increase the volume of air moving through the propeller and in a direction coordinate with the direction of rotation of the propeller, thus to improve the efficiency of the windmill.

Abstract: A propeller blade for a multi-bladed propeller comprises a radial inner pion, a radially outer portion and a transition portion extending therebetween. Generally, the leading edge of the blade portions are colinear and the trailing edges of the inner and outer blade portions are offset from each other so that shoulders are defined on the transition portion and the outer blade portion has a higher blade angle of attack than the inner blade portion. The shoulders extend from the leading edge to the trailing edge of the transition for providing flow stability and blade reinforcement.

Abstract: The invention relates to a boat propeller unit with double, counter-rotating propellers. The forward propeller is designed to function without cavitation, while the after-propeller is optimally cavitating by being made cupped and with a blade width of between 60% and 75% of the blade width of the forward propeller.