Abstract: A quick connect mounting assembly for a ceiling fan. The quick connect mounting assembly includes two releasably attachable plates that are easily interconnected to mechanically couple elements of a ceiling fan. The quick connect mounting assembly can be used to mount a ceiling fan switch housing to a ceiling fan motor assembly.

Abstract: A ceiling fan may include a column; a hub case coupled to the column and rotatable with respect to the column; and a plurality of blades disposed at the hub case, and arranged radially around the column. Each blade may include a lower blade having a first side coupled to the hub case and a second side, opposite to the first side, directed radially outwardly; an upper blade spaced apart from the lower blade, and having a first side coupled to the hub case and a second side, opposite to the first side, directed radially outwardly; and an air gap disposed between the lower blade and the upper blade. The blade may be formed as a tandem blade, thereby generating a greater lift force than a blade having one positive pressure surface and one negative pressure surface, such that an air volume may increase at a same power output.

Abstract: The present disclosure discloses a fan lamp, relates to the technical field of lighting lamp. The fan lamp includes a ceiling suction assembly, a hanger rod, a blade assembly, a light source assembly, and a driver, the ceiling suction assembly is connected with the blade assembly through the hanger rod, the light source assembly is connected with the blade assembly, and the light source assembly is located on a side of the blade assembly facing away from the ceiling suction assembly, the driver is mounted in the ceiling suction assembly or the light source assembly, and the driver is electrically connected with at least one of the blade assembly and the light source assembly, the light source assembly includes a chassis and a directional lighting module, and the directional lighting module is mounted on the chassis.

Abstract: A ceiling fan includes: a column; a hub case which is coupled to the column and rotatable with respect to the column; and a plurality of blades disposed in the hub case, wherein each of the blades comprises: an upper blade having one end coupled to the hub case; a lower blade which has one end coupled to the hub case and is spaced apart from the upper blade; and an end tip connecting the other end of the upper blade and the other end of the lower blade.

Abstract: Methods, devices, and systems for adjusting for air flow temperature changes in an aspirating smoke detector are described herein. In some examples, one or more embodiments include a blower configured to cause air to flow through the aspirating smoke detector, and a controller configured to determine a temperature of the air flowing through the aspirating smoke detector has changed by a particular amount and adjust a speed of the blower in response to compensate the air flowing through the aspirating smoke detector that has changed by the particular amount.

Abstract: An installation structure of a ceiling fan and an upper illuminating lamp includes a first mounting unit that is disposed on one of a connecting portion of a ceiling fan body and a lamp unit and a second mounting unit that is disposed on the other one of the connecting portion and the lamp unit. The second mounting unit corresponds to the first mounting unit. The first mounting unit and the second mounting unit are connected to each other so that the lamp unit and the ceiling fan body are coupled together, so as to complete the assembly quickly.

Abstract: In one aspect, luminaires are described herein having sensor modules integrated therein. In one aspect, a luminaire described herein comprises a light emitting face including a LED assembly. A sensor module is integrated into the luminaire at a position at least partially overlapping the light emitting face. In another aspect, a luminaire described herein comprises a LED assembly and a driver assembly. A sensor module is integrated into the luminaire along or more convective air current pathways cooling the LED assembly or driver assembly.

Abstract: A hidden fan and a fan lamp are disclosed. The hidden fan includes a turntable assembly and a plurality of fan blade assemblies arranged at the turntable assembly, the turntable assembly has a turntable and a limit wheel configured to rotate relative to the turntable, the turntable has a plurality of fan blade fixing portions, and the plurality of fan blade fixing portions are annularly arranged around a center of the turntable, at least one of the fan blade assemblies has a fan blade and a return elastic component, the fan blade has a fixed portion and a linkage portion arranged at a side of the fixed portion, the fixed portion is arranged at the corresponding fan blade fixing portion, the linkage portion is connected with the limit wheel.

Abstract: An integral fan blade includes a fan blade connecting disk and a plurality of fan blade bodies arranged around and equidistantly surrounding the fan blade connecting disk. The fan blade bodies and the fan blade connecting disk are integrally formed. This design allows the wind angle to cover a cone-shaped area from top to bottom. Under the same specifications, the wind force is relatively larger than ordinary conventional fan blades, and the coverage area is also larger, thus bringing better blowing effect and better use effect to users.

Abstract: A ceiling fan structure includes a mounting bracket, a hanging plate, a coupling, and a motor. The mounting bracket is fixed to a ceiling. The hanging plate has a top fixed to the mounting bracket. The top is formed with a recessed accommodating groove for accommodating a first electronic component. The coupling is connected to a bottom of the accommodating groove and extends downward. The coupling is connected with a support plate extending horizontally. The support plate is configured to support a second electronic component. The internal space of the ceiling fan structure is properly planned so that the components of the ceiling fan structure can be reasonably configured, so as to improve the efficiency of assembly.

Abstract: A quick-connect electrical fixture mounting device having first and second junction box mounting plates is provided. The first junction box mounting plate is removably affixed to the junction box, and a first electrical connector is positioned in a channel in a front face of the first junction box mounting plate. The second fixture mounting plate is removably affixed to the electrical fixture, and a second electrical connector is positioned in a slot in a projection extending upwardly from a front face of the second fixture mounting plate. The channel in the front face of the first junction box mounting plate is sized to slidably receive the projection extending from the front face of the second electrical fixture mounting plate, and the first electrical connector is configured to mate with the second electrical connector.

Abstract: An illuminated rib for a folding hand fan comprising: a housing; and a lighting assembly, which comprises one or more light sources; wherein the lighting assembly is configured to be substantially encased within the housing; wherein when the lighting assembly is turned on a light from the one or more light sources is visible through the housing; and wherein the illuminated rib for the folding hand fan is configured to be operatively connected to one or more additional ribs and a leaf of the folding hand fan.

Abstract: A light cover assembling structure has a light housing, a mounting sleeve, a light-emitting element, a transparent light cover, and a supporting cover. The mounting sleeve has an inner end mounted in the light housing and an outer end extending out of the light housing. An inner surface of the light housing and an outer surface of the mounting sleeve form an assembling space. The transparent light cover is mounted on the outer end of the mounting sleeve. The supporting cover is mounted on the outer end of the mounting sleeve, and has a first supporting side wall formed circumferentially and abutting the transparent light cover. The first supporting side wall of the supporting cover supports the transparent light cover such that the transparent light cover is firmly mounted on the mounting sleeve.

Abstract: A connected downlight including: a housing module including a first housing end and a second housing end; a lighting module mounted to the first housing end; and a wireless communication module including an antenna and arranged within the housing interior proximal the second housing end.

Abstract: A quick connect mounting assembly for a ceiling fan. The quick connect mounting assembly includes two releasably attachable plates that are easily interconnected to mechanically couple elements of a ceiling fan. The quick connect mounting assembly can be used to mount a ceiling fan switch housing to a ceiling fan motor assembly.

Abstract: The present subject matter is directed to a rotor blade assembly for a wind turbine having an improved shear web configuration. The rotor blade assembly includes an upper shell member having a spar cap configured on an internal surface thereof and a lower shell member having a spar cap configured on an internal surface thereof. The shear web extends between the spar caps along a longitudinal length of the blade. Further, the shear web includes at least one pultruded component defining a hollow cross-section.

Abstract: A motor of a ceiling fan includes a support unit, a rotor unit, a first bearing, a supporting bearing and a stator unit. The support unit has a shaft. The rotor unit has a rotational connecting member. The rotational connecting member includes a central hole through which the shaft extends, as well as an inner flange extending inwardly of the central hole. The first bearing includes an inner race fit around the shaft and an outer race connected to an inner periphery of the rotational connecting member. The inner and outer races are spaced from each other in a radial direction perpendicular to the shaft. The supporting bearing includes a fixed race fit around the shaft and a rotational race abutting with the inner flange. The fixed race and the rotational race are spaced from each other in an axial direction. The stator unit is connected to the support unit.

Abstract: A connected downlight including: a housing module including a first housing end and a second housing end; a lighting module mounted to the first housing end; and a wireless communication module including an antenna and arranged within the housing interior proximal the second housing end.

Abstract: A method of determining a twist angle of a wind turbine blade, the method comprising providing first and second transmitters on the wind turbine blade, the first transmitter being spaced apart from a receiver by a first distance, and the second transmitter being spaced 5 apart from the receiver by a second distance, the transmitters being arranged such that twisting of the blade causes an increase in one of the first or second distances and a decrease in the other of the first or second distances; transmitting a blinking signal from each of the first and second transmitters towards the receiver, the blinking signals having a blinking frequency; varying the blinking frequency of the blinking signals; monitoring the 10 amplitude of the blinking signal received by the receiver as the blinking frequency is varied; determining a particular blinking frequency that results in an increased amplitude of the blinking signal received by the receiver; and using the determined particular blinking frequency to calculate th

Abstract: A cooling fan includes a fan base, an impeller part, a driving part, an illumination circuit board and plural light-emitting elements. The driving part includes a shaft seat, a driving circuit board and plural coils. The driving circuit board is disposed on the fan base. The plural coils are arranged between the driving circuit board and the illumination circuit board and arranged around the shaft seat. The rotating shaft of the impeller part is inserted into the shaft seat. When an electric current flows through the plural coils, the rotating shaft is rotated. The plural light-emitting elements are disposed on the illumination circuit board. When the electric current flows through the plural light-emitting elements, the plural light-emitting elements emit light beams.

Abstract: Heat-dispersion-elements for cooling light-module-inserts, as well as methods for cooling and systems for cooling are described. The heat-dispersion-element may have an outer arc and disposed opposite an inner arc. At least portions of the outer arc may be in direct physical contact with at least some portions of inside-surfaces of a housing. At least portions of the inner arc may be in direct physical contact with at least some portions of outside-surfaces of the light-module-insert. The heat-dispersion-element may be located between the light-module-insert and the housing. The heat-dispersion-element may have an overall torus or torus like shape, or a partial torus like shape. The heat-dispersion-element may have a base and fingers extending from that base. The base may be curved into the outer arc. The fingers may be curved to form the inner arc.

Abstract: A ceiling fan including a retention system and method of redundantly retaining a ceiling fan can include a ceiling fan motor assembly including a hollow motor shaft at least partially surrounded by a motor housing. A retainer plate is provided at the bottom of the motor housing including an opening. A retainer rod extends through the opening in the retainer plate and secures to the retainer plate. A support cable couples to the retainer rod to suspend the retainer plate from a structure, wherein the retainer plate is configured to redundantly retainer the ceiling fan.

Abstract: An aircraft beacon device of a wind power installation, to be arranged on a gondola of the wind power installation, comprising at least three omnidirectional emission sections arranged concentrically in a ring around a common mid-axis, each omnidirectional emission section comprising a lens section arranged concentrically in a ring around the mid-axis, with a beam plane defined perpendicularly to the mid-axis, and at least one lighting ring having lighting means arranged concentrically in a ring around the mid-axis in order to emit light through the lens section, wherein each lighting ring is configured in order to emit light with a central emission direction which makes an emission angle with the beam plane, and wherein the emission direction depends on an axial position of the lighting ring with respect to the lens section, wherein at least one omnidirectional emission section comprises at least two lighting rings offset axially with respect to one another for emission with different emission angles.

Abstract: The present invention relates to a method and to a wind turbine for determining the tip angle of a blade of a wind turbine rotor during rotation of the rotor. The method comprising: (a) transmitting a light signal from a first blade of the wind turbine rotor towards a second blade of the rotor; (b) receiving the light signal at the second blade of the rotor; and (c) calculating the tip angle of the first or second blade based upon characteristics of the received light signal.

Abstract: A fan unit (1), in particular for an air conditioning system of a motor vehicle, comprising an electric motor (2) for driving a fan wheel (3), an electronic device (7) which generates waste heat and provides electrical current to the electric motor (2) and a fan housing (6), wherein the fan wheel (3) is disposed together with the electric motor (2) in an air guiding region (5) delimited by the fan housing (6). Provision is thereby made for the electronic device (7) to be fastened to the side of the fan housing (6) which faces away from the air guiding region (5) in a heat transferring manner so that a heat transfer connection is formed between the electronic device (7) and the air guiding region (5).

Abstract: A fan is provided, including a driving member, a fan bracket, a main fan and a main cover. The fan bracket is assembled with the driving member. The main fan is disposed on a first connecting portion of the fan bracket. The main cover is disposed on a second connecting portion of the fan bracket. An airflow space is formed between the main fan and the main cover. The main cover is formed with a first wind-guiding cover. Thereby, when the driving member drives the main fan to rotate, air can be inhaled through the first wind-guiding cover into the airflow space, and air will be exhaled toward a periphery of the airflow space by using a guidance of the first wind-guiding cover.

Abstract: A ceiling fan lighting system includes a fan assembly, a light assembly and a lift mechanism. The fan assembly includes a motor and a plurality of fan blades being operationally coupled to the motor to permit rotation of the fan blades when the motor is supplied with power. The light assembly is coupled to the fan assembly and has at least one light source and a lamp shade enclosing the light source. Moreover, the lift mechanism is configured to move the light assembly in a vertical plane with respect to the fan assembly in order to have the lamp shade of the light assembly enclose or disclose the fan blades of the fan assembly.

Abstract: Apparatus, systems and methods of 50/60 CFM exhaust and ventilation fans for bathrooms with flaps/ears that allow the housings to mount directly to joists and/or other structural members inside of a ceiling or inside of a wall. The housing can include a mounting plate having a motor with attached impeller thereon, wherein the mounting plate with motor and attached impeller can be removed as a single unit from the housing for accessing and inspecting interior wire connections during inspection and for ease in replacing parts such as burned out motors overtime.

Abstract: Devices, apparatus, systems, and methods for the quick installation of ceiling fan blades for ceiling fans. The invention uses a blade with three slots running in a linear direction from the mounting end of the blade, and three pre-attached fasteners upwardly projecting from the outer end of a blade arm. One of the fasteners is springably bendable with inwardly extending clip edge, another fastener that forms an upright post, and a third fastener having a top end with an outwardly extending lip edge. Another embodiment can include four slots per blade and four pre-attached upwardly protruding fasteners per blade arm. A novel method of installing each blade can include angling the blade to the mounting ends of the blade arm so that the outwardly extending lip edge catches on the third slot in from the mounting end of the blade.

Abstract: A removable bass drum head cover with a printed display is provided. The drum head cover may be releasably attachable to a bass drum head. In certain embodiments, the drum head cover may be releasably attachable to the bass drum head cover by a hook and loop fastener. Therefore, drummers may easily interchange the designs, artwork, and band names displayed on their bass drum heads.

Abstract: The present invention relates to a table top, solar-powered charging/electricity providing to renewable devices having a shade structure for outdoor use. The invention having a base structure for stabilizing the device and for providing one or more compartments for storing items therein and/or providing a docking station or cellular phone charging station, a shade structure which contains one or more solar cells attached to an outer surface thereof, an attachment arm which connects the base and the shade structure, and various electronic components operative to convert solar energy into electricity.

Abstract: A photo-catalyzing fluid mobilizing system and method are disclosed. A chamber has a power source. A fluid mobilizer is mounted in the chamber and connected with the power source to mobilize a fluid through the chamber. The fluid mobilizer includes one or more fan blades that are coated with a photo catalyst. A UV light source is mounted in the chamber proximate the fluid mobilizer and connected with the power source to catalyze the photo catalyst coating the blades to purifier the fluid being mobilized thereover.

Abstract: A lighting and heating assembly is provided. The lighting and heating assembly is configured for mounting to an existing ceiling fan. The lighting and heating assembly includes a lighting assembly for distributing light and a heating assembly for providing heat to the air circulated by the ceiling fan. The lighting assembly is attachable to the ceiling fan and has the heating assembly detachably connected thereto, which allows the lighting assembly to be used without the heating assembly. Additionally, the lighting and heating assembly is adjustable such that the lighting assembly and/or heating assembly are repositionable at desired locations in relation to one another and the air flow generated by the ceiling fan.

Abstract: Apparatus, systems and methods of 50 CFM exhaust and ventilation fans for bathrooms with grill covers having removable light lens covers, and flaps/ears that allow the housings to mount directly to joists and/or other structural members inside of a ceiling or inside of a wall. The housing can include a mounting plate having a motor with attached impeller thereon, wherein the mounting plate with motor and attached impeller and electrical connectors can be removed as a single unit from the housing for accessing and inspecting interior wire connections during inspection and for ease in replacing parts such as burned out motors overtime.

Abstract: A paddle is provided with lighting devices in the blade of the paddle.

Abstract: The present invention relates to a ceiling fan (1) with a modular structure, which comprises a central hub (2), from the periphery of which blades (3) extend. Said central hub (2) has top (12) and bottom (13) surfaces arranged on planes parallel to the ceiling. Besides, the ceiling fan (1) further has a driving motor, means (14) for fixing the central hub (2) to the ceiling, control means and electric and/hydraulic connection means connectable to sources of electric and/or hydraulic feed provided on the ceiling. The top (12) and (13) surfaces of the central hub (2) are provided with means (11) for fixing accessory modules. These accessory modules may consist of sources of illumination, sound propagation sound, air heaters, liquid spraying means, environment deodorizing means, air purifiers, among others.

Abstract: A ventilation fan with illumination includes a housing, a fan, and lighting equipment in the housing. The housing includes a first opening communicating with an air outlet, the first opening communicating with a duct, and a second opening that communicates with an interior space, The lighting equipment includes a light, a cover in the housing that surrounds the light periphery, the cover reflecting light and transmitting the light into the space through the second opening, and a restrictor that restricts passage of air between the light periphery and the lighting cover. An air intake gap is provided between a lower end of the cover and an edge of the second opening and introduced through the second opening and the air intake gap, is discharged through the first opening into the duct, the edge of the second opening being located below the lower end of the cover.

Abstract: A ceiling fan including a motor having a rotating flange; a single integrally formed fan blade, wherein the fan blade includes two substantially equally weighted wing portions disposed opposite each other; and a center portion disposed between and integrally formed with the two wing portions and having a passageway therethrough, wherein the passageway is sized such that the fan motor fits at least partially within the passageway; and means for attaching the center portion of the fan blade to the rotating flange of the motor is provided.

Abstract: An LED lamp, integrated to electric fan, comprising at least one flat LED lamp that comprises a light box containing, light diffuser, light reflector, multiplicity of packaged LEDs, heat sink, vent holes and printed circuit board, is powered by a programmable LED driver unit. The lamp employs multiplicity of packaged LEDs as a source for generating visible light for illumination. The LED lamp can be made in any shape and size and can be integrated to the electric fan at the front side or back side of the fan. The programmable driver unit can be programmed to apply desired ratio of power to RGB LEDs to generate various colors of light and hues of colors of light from the LED lamp containing multiplicity of packaged RGB LEDs. The program can be adjusted to generate various colors of light and hues of colors of light from the LED lamp depending on the time of the day or night.

Abstract: A ventilation fan with illumination includes a housing, a fan, and lighting equipment in the housing. The housing includes a first opening connected to an air outlet, the first opening communicating with a duct, and a second opening that communicates with an interior space, The lighting equipment includes a light, a cover in the housing that surrounds the light periphery, the cover reflecting light and transmitting the light into the space through the second opening, and a restrictor that restricts passage of air between the light periphery and the lighting cover. An air intake gap is provided between a lower end of the cover and an edge of the second opening and introduced through the second opening and the air intake gap, is discharged through the first opening into the duct, the edge of the second opening being located below the lower end of the cover.

Abstract: A ceiling fan comprising: a fan motor and blade assembly, a mounting tube for suspending the fan motor and blade assembly from a ceiling, and a power supply mounted within the mounting tube configured to power the fan motor. Also a ceiling fan comprising a moulded stator frame, a raised turret integrally moulded within the frame configured to enclose and mount a motor controller, and an external user changeable auxiliary module. Also ceiling fan comprising: a totally enclosed safety extra low voltage fan motor assembly configured to be suspended from an upper side, and a scaling arrangement within the assembly providing a substantial degree of ingress protection against dust and water incident from at least an under side. Also a method comprising providing a ceiling fan comprising moulded stator frame, and mounting an external user changeable auxiliary module to a raised turret integrally moulded within the frame.

Abstract: Method for operating an offshore wind farm with at least one wind turbine system and a navigation device, which is operated in a normal mode, wherein a hazard signal is received by a receiving device, the received hazard signal is supplied to a control device that switches the navigation device from the normal mode to a an emergency lighting mode.

Abstract: A wind turbine comprising an elongated blade body, a system for detecting an ice layer on the blade body, the system comprising a light source for emitting a light beam; a light splitting optical element optically connected to the light source so as to receive the light beam emitted from the light source, the optical element adapted to split the light beam received from the light source into a reference light beam and a detecting light beam, a boundary area which is arranged at the blade body so as to be exposed to the outer surroundings of the blade body and which is optically connected to the light splitting optical element such as to receive the detecting light beam and to reflect an internal reflected part of the detecting light beam at the boundary area and to transmit a transmitting part of the detecting light beam to the outer surroundings of the blade body through the boundary area and to allow an external reflected part of the transmitting part of the detecting light beam, which has been reflected fr

Abstract: A ceiling light assembly which comprises: a main body comprising (a) an upper shell developing an upper shell space inside and one group of suction holes at its surface and (b) a lower shell on which a lower through hole is centrally opened; a fan unit held in the upper shell space and comprising at least a fan body and an airflow tube to which the fan body is connected wherein the airflow tube is a hollow ringlike tube developing an air passage internally and having an air outlet which faces downward being away from the fan body and linking said air passage; a lighting unit installed in the main body to realize the hidden fan unit which is integrated with the lighting unit.

Abstract: The present invention relates to a displayable wind turbine. The displayable wind turbine includes a central shaft arranged vertically to a flow direction of fluid. Radially extending upper spokes are coupled to an upper hub. Radially extending lower spokes are coupled to a lower hub. Blades have first ends connected to an end of the upper hub and second ends connected to an end of the lower hub. A pitch control unit adjusts a blade pitch angle. A detection unit includes a fluid direction detection unit, a fluid velocity detection unit, a central shaft speed detection unit, and a central shaft position detection unit. A light emitting unit includes a printed circuit board and light emitting devices. A control unit controls operations of the pitch control unit and the light emitting unit.

Abstract: A ceiling fan comprising an electric motor that drives a circular plate, the circular plate has three or four equally spaced quadrants positioned adjacent its periphery each quadrant is secured to the plate to be pivotal thereto to provide limited acuate movement about the pivot axis, each quadrant having a fan blade secured thereto, the acuate movement of each quadrant being confined from a first position where the blades are within the periphery of the plate to a second position where the blades extend radially outwardly at the plate, each quadrant being attached to the plate by a coil spring which urges the quadrant into the first position, each quadrant being directly joined to the adjacent quadrant by a rigid tie bar so that any movement of one quadrant causes the same movement of all the other quadrants.

Abstract: A ceiling fan includes an outer rotor motor having a rotor connected to a rotating disc and a stator connected with an inner tube. An outer tube is fitted around the inner tube, having one end connected with the rotating disc, and a plurality of elastic buffer pieces are positioned between the outer tube and the rotating disc. By so designing, when the rotor is rotated to actuate the rotating disc together with the outer tube to rotate, the elastic buffer pieces can absorb the vibration produced by operation of the outer rotor motor and also correct bias swinging of the outer tube through their elastic deformation to enable the outer tube to be rotated stably.

Abstract: There is provided a combined ceiling fan and light fitting (10) having blades (1-4) that when the ceiling fan is not in use retract and are stowed above an enclosure (12) containing a light emitting device and that when the fan is in use are extended under centrifugal force. The blades are formed in such a way as to both stow compactly above the enclosure and provide reasonable aerodynamic performance. Each blade partially overlies a neighbouring blade when in its stowed position and the blades are so formed as to permit such stacking while limiting the overall height of the assemblage of stowed blades.

Abstract: A ceiling mounted ventilation fan with illumination capable of suppressing conduction of noise to inside of a room is provided. In the fan, a restriction member is provided for restricting passage of air between a lighting cover and a periphery of a lighting part, the lighting cover having a reflecting surface for reflecting light from the lighting part to lead the light to the inside of the room. A gap for air intake is formed between a lower end of the lighting cover and an edge of the indoor-side opening. Thus, air introduced into the main housing through the gap is discharged into the duct by the fan unit and conduction of noises produced by the fan unit to the room inside with the noise directivity enhanced in the lighting cover can be suppressed by the restriction member, so that conduction of noise to the room inside can be suppressed.

Abstract: A combined ceiling fan and light fitting (fan/light) having folding fan blades is provided. The fan light has a blade support arranged to be rotated by an electric motor, with blades being secured to the blade support, a root end of each blade being pivotable between folded and operative positions about a blade pivot axis fixed in the blade support. In one aspect of the invention, an improved mechanism is provided for synchronizing movement of the blades. This uses a sun gear mounted to the blade support and arranged to mesh with planet gears that rotate about the blade pivot axes. In addition improvements are provided to blades and blade mounting arrangements that balance compact folding of the blades and good air moving effectiveness.