Abstract: A system for controlling the pitch of a propeller blade for an aircraft turbine engine is provided. The system generally includes a cup having an annular wall extending about a pitch setting axis of the blade, the annular wall having a lower axial end enclosed by a bottom wall, and an upper axial end that is open and configured so as to enable a root of the blade to be mounted in the cup; and a locking ring that extends around the pitch setting axis and is configured to be mounted around the root, the locking ring being a double dog ring that comprises two annular rows of outer dogs constituting active and safety dogs, respectively.

Abstract: A system for controlling the pitch setting of a propeller blade for an aircraft turbine engine is provided. The system generally including a blade having an airfoil connected to a root; a cup having an annular wall extending about a pitch axis of the blade and a lower axial end enclosed by a bottom wall; a locking ring that extends around the root and inside the cup; a safety element that ensures the retention of the root relative to the cup. The at least one safety element can have a generally elongate shape and can pass through aligned holes in the bottom wall of the cup and in the free end of the root.

Abstract: One embodiment is an electric drive system for an aircraft comprising a plurality of redundant motors, wherein power generated by the plurality of motors is used to drive a rotor system comprising a rotor shaft having a plurality of rotor blades connected thereto; a gear box associated with the plurality of redundant motors; a collective actuator for controlling a collective pitch of the rotor blades connected to the rotor shaft; and at least one structural element for retaining the redundant motors, the gear box, and the collective actuator together as a single integrated unit.

Abstract: One embodiment is a bearing carrier assembly including a circular shield having top and bottom surfaces; and a number of bearing separators integrated with the bottom surface of the shield, wherein each pair of bearing separators defines a receptacle for receiving and retaining a bearing therewithin and wherein the shield blocks the received bearings from debris and retains lubricant around the received bearings. Each of the bearing separators may include a spacer element for separating adjacent ones of the bearings. The bearing carrier assembly may be made up of a number of carrier sections that interconnect to form the bearing carrier assembly.

Abstract: The invention relates to a hub for an unducted propeller (14) having variable-pitch blades (18) of a turbine engine, comprising two parallel annular side walls (34) between which are arranged rings (36) which are distributed angularly in a regular manner around a longitudinal axis (A) of the hub, which are connected to the annular side walls (34), and which comprise compartments (26) receiving bearings (32) having radial axes (R) for guiding in rotation roots (30) of blades of said propeller, said rings (36) being connected in pairs by connection means (40) which are arranged between the annular side walls (34) and which comprise substantially radial reinforcing partitions (42, 44, 46), characterised in that at least some of said reinforcing partitions (42, 44, 46) are connected to said annular side walls (34).

Abstract: The rolling bearing for a blade root includes an outer ring (13) and an inner ring (12). An inner space (43) is defined between the inner surface (33) of the outer ring (13) and the outer surface (25) of the inner ring (12). At a distal end (46), the inner space (43) is closed off by a distal sealing system (47) between the outer ring and the inner ring. A system (57) for retaining the distal sealing system (47) includes a retaining body (58), and a thread/tapping system provided on a peripheral assembly surface of the retaining body and on a peripheral surface of the facing inner or outer ring. The retaining body (58) is screwable into a retention position in which an axial abutment surface (61) of the retaining body forms an axial stop for the distal sealing system longitudinally (B), in the proximal->distal direction.

Abstract: A propeller blade mounting system includes a mounting system (4) on rolling bearings between a propeller hub (3) and a propeller blade (2), wherein: at least one bearing outer ring (9) is connected in rotationally fixed manner to the propeller blade (2); at least one bearing inner ring (15, 16, 17) is mounted on the propeller hub (3); a sleeve-shaped central section (13) connected to the propeller blade (2) is disposed radially inside the bearing inner ring (15, 16, 17); and a lubricant chamber (18) is formed between the bearing outer ring (9) and the central section (13) in the radial direction, relative to the rotational axis (R) of the propeller hub (3), and is closed towards the exterior.

Abstract: A ceiling fan includes a body having a disk which is driven by a motor. Multiple frames are connected to the disk and each frame has a rod which is connected between at least two seats and the disk. The at least two seats each are positioned by an inclination angle relative to a horizontal plane. A height difference is formed between the at least two seats of each rod. A blade is connected to each of the at least two seats of each rod of each frame. The ceiling fan includes less number of seats while more blades are connected to the seats.

Abstract: The present disclosure is directed to a rotor blade assembly for a wind turbine. The rotor blade assembly includes a rotor blade having a blade root section and a rigid ring insert. The rotor blade has pressure and suction sides extending between leading and trailing edges. The blade root section includes an end face configured to attach the rotor blade assembly to a hub. Further, the blade root section includes a span-wise end portion defined by inner and outer circumferential components separated by a radial gap. The radial gap includes a first laminate material embedded between the inner and outer circumferential components at a first span-wise depth and a second laminate material embedded between the inner and outer circumferential components at a second span-wise depth. Thus, the rigid ring insert is disposed in the radial gap and embedded between the first and second laminate materials.

Abstract: This invention relates to a blade assembly comprising: a hub which is rotatable about an axis; at least one blade having an aerofoil portion and a root, wherein the root is coupled to the hub using a primary retention device which prevents radial separation of the root and hub in normal use; and, a secondary retention device which comprises an annular catcher having a restriction through which the root portion cannot radially pass, the restriction being located radially outwardly and radially spaced from the root part during use.

Abstract: A blade shank assembly for an aircraft propeller blade includes a blade shank; and a split blade retention race encircling the blade shank, the split blade retention race comprising two sections separated by two splits, the two splits being perpendicular to a race surface of the split blade retention race, wherein the split blade retention race comprises: an inner chamfer located between a surface of the split blade retention race that is adjacent to the blade shank and a split surface of the split blade retention race at each of the two splits; and an outer chamfer located between the race surface of the split blade retention race and the split surface at each of the two splits.

Abstract: A support ring for a rotary assembly such as a propeller assembly includes support cups for receiving blade roots of propeller blades. The support cups are interconnected by bridging structures. Each bridging structure includes bridging walls which extend radially from a bridging web. The bridging structures thus have a channel-shaped cross-section. The bridging walls have a scalloped configuration at their radially outer edges. As a result of this configuration, the neutral axes of the bridging structures are straight, so that the support ring behaves, in structural terms, as a polygon.

Abstract: The invention relates to a rolling bearing arrangement (5) for mounting parts of a wind power plant (1), comprising three relatively rotatable annular elements (6-8) arranged concentrically with one another and at least regionally inside one another for connection to relatively rotatable parts of the wind power plant, wherein two relatively rotatable connecting elements (6-9) are separated from each other by a gap (9, 10) and partially or wholly overlap each other in the radial direction, wherein, further, provided in the region of a gap in radially overlapping regions of the annular connecting elements are at least two rows of rolling elements (34, 35), each of which rolls along a respective two raceways (32, 33) that overlap each other at least regionally in the radial direction, as well as at least one additional row of rolling elements (42) whose raceways do not overlap in the radial direction, wherein the radially innermost connecting element and the radially outermost connecting element are connected to

Abstract: Embodiments of the invention relate to a rotor system, particularly for use in a wind turbine generator system. A support (11) is provided having first and second rotating members (12, 13) coupled thereto, the rotating members being able to rotate about a common axis. One or more flexible blades (14, 15) having at least two ends are provided, one end being mounted on the first rotating member and another end being mounted on the second rotating member, so that they may rotate about the common axis. Actuating means are provided, being arranged to cause the ends of each blade to move closer together by movement of at least one of the rotating members along the common axis. The first and second rotating members are arranged to rotate relative to each other, said rotation allowing the flexible blades to coil around an axis.

Abstract: A wind turbine is described which comprises a tower, a nacelle mounted to the top of the tower, and a rotor mounted to the nacelle. The rotor comprises two or more blades mounted to a central hub. The hub supports two or more annular pitch bearings associated respectively with the two or more blades. Each pitch bearing defines a bearing plane inclined at a first angle with respect to a horizontal plane when the respective blade is oriented in a downwardly direction in alignment with the tower. Each pitch bearing is spanned by a hub plate; and a work platform integral with or mounted to the hub plate lies generally in a plane at a second angle to the horizontal plane when the respective blade is oriented in a downwardly direction in alignment with the tower, which second angle is less than the first angle. The work platform provides a substantially horizontal platform for use by maintenance personnel when installing or servicing components in and around the hub.

Abstract: A mounting system for mounting a blade to a rotor body includes a pitch control mechanism including an anchor and a pitch change rod extending radially outwardly from the anchor to join to a base of the blade. The anchor and the rod are rotatable about the longitudinal axis of the rod to vary the blade pitch. The pitch control mechanism further includes a torque-transmitting formation between the blade and the anchor such that pitch-varying torque can be transmitted to the blade through the torque-transmitting formation while allowing relative radial movement between the blade and the anchor. The system includes a primary bearing formation, which transmits blade centrifugal loads to the rotor body while accommodating variation of the blade pitch, and secondary bearing formation, which transmits pitch change mechanism centrifugal loads to the rotor body while accommodating rotation of the anchor and the rod during variation of the blade pitch.

Abstract: A ship drive having a drive machine, a transmission, a propeller shaft that is driven by the transmission and a mounting arrangement by which the ship drive can be secured to a hull of a ship. The drive machine and the transmission are connected to one another by a connecting flange and are arranged inside the hull of the ship. A first mounting point, which is designed as a pivot bearing relative to the rotational axis of the propeller shaft, is arranged in such a manner that a bending moment, produced by the propeller thrust and by the weight of the drive machine and the transmission, is optimized at the connecting flange.

Abstract: A wind turbine blade includes a root region. A first extension (LEX) is attached to the leading edge side of the root region while a trailing edge strake (TES) is attached to the trailing edge side of the root region. The LEX and TES each include an outer profile that becomes more pronounced relative to their respective locations in the root region as the root region of the wind turbine blade morphs from a substantially cylindrical shape to a substantially airfoil shape. The LEX provides both optimal angle of attack and lift generation in the root region, while the TES mitigates airflow separation and enhances airfoil lift in the root region.

Abstract: A hub of a propeller with variable-pitch blades for a turbine engine, for example for a propfan engine. The hub of the propeller includes a polygonal ring with substantially radial cylindrical recesses distributed about a central axis of the ring for receiving the blades, a turbine rotor element of the turbine engine, and a securing flange that is attached to the ring so as to connect the ring to the rotor element. The hub further includes a plurality of back-up hooks inserted with clearance in openings, the back-up hooks being connected either to the ring or to the rotor element, and the openings being connected to the other one of the two.

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 fan comprises a rotatable hub, a plurality of fan blades coupled with the hub, and a plurality of air fences coupled with the fan blades. Each fan blade has a free end and an opposite end secured to the hub. The air fences are positioned at selected locations along the length of the fan blades, between the ends of the fan blades. Each air fence includes a fin, which may extend upwardly or downwardly from the fan blade. Each air fence may be formed of a resilient material and may be configured to allow the air fence to be snapped onto a fan blade. Each air fence may define an opening through which a fan blade may be inserted. One or more surfaces of the air fence may be contoured to complement a surface contour of an airfoil shaped fan blade.

Abstract: A wind turbine having a wind turbine tower with a nacelle provided on the top to which a rotor hub with one or more wind turbine blades is rotatable mounted. A cable twisting system is arranged inside the wind turbine tower and suspended from the bottom of the nacelle. The cable twisting system comprises a number of cable spacing plates having a number of guiding means for guiding the electrical cables from the nacelle to the bottom of the wind turbine tower. A first and second element having engaging fingers configured to be brought into contact with each other are coupled to two adjacent cable spacing plates. The first element rotates relative to the second element when the nacelle is yawing, bringing the fingers into contact with each other. The two elements then rotate together as the nacelle continues to yaw in the same direction.

Abstract: An adjustable fan with a rotary hub capable of supporting rotary blades in a plurality of orientations relative to a rotational axis of the fan.

Abstract: A blade shank assembly for an aircraft propeller blade includes a blade shank; a split blade retention race encircling the blade shank, the split blade retention race including two splits, wherein the split blade retention race comprises: inner chamfers located between the blade shank and the split blade retention race at each of the two splits; and outer chamfers located adjacent to a race surface of the split blade retention race at each of the two splits; and a plurality of ball bearings located on the race surface of the split blade retention race.

Abstract: A method of deploying offshore wind turbine assemblies includes mounting a wind turbine assembly horizontally on a vessel and transporting the wind turbine assembly to an offshore site. The wind turbine assembly is raised to a vertical condition at the site and attached to anchor weights. Blades are attached to the turbine head after the wind turbine assembly is in the vertical condition. In one embodiment, the wind turbine assembly can include a tower including tapered lower and upper sections joined together at their respective wide ends, a turbine head connected to the upper section, and a platform connected to the lower section. The platform includes a buoy tank partially filled with ballast to provide mass and buoyancy. A wave piercing cowling is rotatively attached to the lower section. The turbine head can include an adjustable journal bearing, scabbard blade mounts, and a gearless induction generator with flux adjusting capabilities.

Abstract: A foldable electric fan, comprising: a fan head, a support tube and a base, a turnover mechanism for turning the fan head up or down is provided between the top of the support tube and the fan head, is disclosed. Further, the base is foldable, and the electric fan can be arranged into a desk fan or a floor fan by turning the fan head up or down, and can be used for several different purposes in more broad fields. The fan head and the base of the electric fan can be folded-up, which reduces the space it occupies and cuts down the cost of package and transportation. Moreover, the foldable electric fan effectively reduces the inconvenience of traditional electric fans which need to be detached into several parts during package and transportation, and then assembled together for use.

Abstract: A rotor blade assembly for a wind turbine includes a ring insert in the blade root section. The blade root section has a span-wise end portion defined by an inner circumferential component and an outer circumferential component, with a radial gap between the components. The ring insert is disposed in the radial gap and is bonded to the inner and outer circumferential components. The ring insert has an inner circumferential surface and an outer circumferential surface, wherein at least one of the inner or outer circumferential surfaces has a radially varying cross-sectional profile that increases bonding surface contact area between the inner or outer circumferential surface and the respective circumferential component of the blade root section as compared to a constant radius cross-sectional profile.

Abstract: The invention relates to a wind turbine, comprising a blade, a hub and a bearing for mounting the blade to the hub comprising an inner bearing ring and an outer bearing ring, wherein the blade is connected to the inner bearing ring or the outer bearing ring, wherein the blade comprises multiple cross holes and longitudinal holes for receiving cross bolts and longitudinal bolts respectively in its wall in a connection area where the blade is connected to the inner bearing ring or the outer bearing ring and wherein at least one longitudinal bolt is disposed within the blade wall in thickness direction of the wall.

Abstract: The invention relates to a wind turbine blade bearing removal apparatus and method for facilitating the change-over of the blade root bearing assembly (58) of a wind turbine blade (54). A plurality of support shoulders or yokes (60) are located on the hub (50) of the wind turbine rotor and provide attachment points for respective actuators (62). Corresponding attachment points (66) are provided in the wind turbine blade (54) via a blade support (section 64), which is constructed in the blade between the blade root bearing assembly (58) and the tip. The actuators (62) are mounted between the hub (50) and the blade root bearing assembly (58) and therefore support the blade (54) in a suspended position when the bearing is to be retained. The actuators (62) allow the blade to be easily reattached to the hub (50) when the blade root bearing replacement is completed.

Abstract: The invention relates to an axial-radial rolling contact bearing, in particular for supporting rotor blades (2) on a wind turbine (1), comprising a first bearing ring (7) and a second bearing ring (8), which form an inner ring and an outer ring, and comprising a radial rolling contact bearing row (4) and a plurality of axial rolling contact bearing rows between the first bearing ring (7) and the second bearing ring (8). According to the invention, at least four axial rolling contact bearing rows (5a, 5b, 5c, 5d) which are arranged at a distance from each other in the axial direction (x) are provided, said radial rolling contact bearing row (4) being arranged between the second axial rolling contact bearing row (5b) and the third axial rolling contact bearing row (5c) in the axial direction (x).

Abstract: An automatic pot stirrer is provided that has a mount assembly. The mount assembly is mounted on a pot plate having slider clamps. The slider clamps engage the rim of the pot and are designed to accommodate differently dimensioned pots. The mount assembly supports a shaft that is operatively coupled to a motor at one end and threaded to a block at the other end. The block has opposed first and second block end walls and opposed first and second block paddle walls to which are connected paddles. The first and second block paddle walls may be disposed at about a forty-five degree angle to a second block end wall. The paddles are disposed at about a forty-five degree angle to the second block end wall such that the paddles lift food product from the bottom of the pot during operation of the automatic pot stirrer.

Abstract: A tapered roller bearing element includes a first end and a second end, the second end having a second end radius. There is an apex ring between the two ends having an apex ring radius. There is also a base cone extending between the first end and the apex ring, the base cone tapering outwardly at a base cone angle. In addition, a relief cone extends between the apex ring and the second end, the relief cone tapers inwardly at a relief cone angle, and relief cone angle is larger than the base cone angle.

Abstract: Embodiments of a bi-axial compliant bearing assembly and methods of assembling the bi-axial compliant bearing assembly are disclosed. A bi-axial compliant bearing assembly employs a transition bearing race. The transition bearing race comprises a cylindrical surface. The cylindrical surface is configured to rotatably engage a rotational bearing element and to slidably engage the rotational bearing element along an axis. The transition bearing race also includes a spherically-compliant surface. The spherically-compliant surface is configured to engage a spherically-compliant element and to enable the spherically-compliant element to rotate transversely to the axis.

Abstract: A wind turbine includes a blade position adjustment system providing for continued wind turbine blade repositioning operation even after the occurrence of certain faults. The system includes a plurality of electrically operable motors, each of which is interconnected with one of the wind turbine blades to reposition that wind turbine blade and modify the blade pitch. Each motor includes two or more sets of electrically isolated windings, and a power supply is separately interconnected with each of the electrically isolated winding sets to provide for continued repositioning of each blade upon occurrence of a fault, such as voltage or current deterioration, in one of the winding sets.

Abstract: A propeller blade pitch actuation system includes a propeller control module (PCM), a PCM drain line, a first drain line, a drain line restriction, a second drain line, and a valve. The PCM drain line connects to the PCM to drain hydraulic fluid. The first drain line is downstream of the PCM drain line and the drain line restriction is downstream of the first drain line. The second drain line is downstream of the PCM drain line. The valve includes a first valve position and a second valve position. The first valve position connects the PCM drain line to the first drain line and the second valve position connects the PCM drain line to the second drain line. Hydraulic pressure of the first drain line between the valve and the drain line restriction is greater than hydraulic pressure of the second drain line.

Abstract: A fluid turbine for generating electrical power, the turbine having a rotor assembly comprising a hub, a rim and a plurality of blade members joining them together, the blade members being rigid, flat panel, multi-ply, composite blade members having a plurality of parallel, longitudinally-oriented, reinforcing cords composed of non-braided aramid synthetic strands, the cords being disposed between at least two cloth layers impregnated with a cured polymer resin.

Abstract: Provided is a wind turbine generator including an electric pitch-control device that efficiently utilizes the entire circumferential teeth of a ring gear of a wind turbine blade so as to eliminate the need for work at high elevation using a crane or the like even when the teeth of the ring gear are partly broken. A wind turbine generator having an electric pitch-control device that performs pitch-angle control by using a motor to drive a pinion gear that meshes with a ring gear of a wind turbine blade includes a plurality of pinion-driving-mechanism securing supporters or a fixing/releasing switching part as a meshing-region changing mechanism that changes a pitch-angle-control meshing region of the ring gear that meshes with the pinion gear during the pitch-angle control.

Abstract: A method of balancing a gas turbine engine rotor comprises the step of obtaining a rotor disc with a circumferential array of balance tabs projecting from a peripheral rim of the disc. Stress shielding scallops are defined in the rotor disc between the tabs. The balancing is achieved by removing material from at least one of the tabs.

Abstract: A system for cooling a user's body is provided. The body cooling system provides a rigid head covering, a ventilation component and an internal deflector component. The ventilation component may be integrated into or be removably attached to the rigid head covering. The internal deflector component directs air flow from the ventilation component along the user's body.

Abstract: An airfoil 11 for attachment to a hub 13 of a windmill 15 or other turbomachine, the airfoil 11 comprises a leading rod 17 and a trailing rod 27, the leading rod 17 and trailing rod 27 preferably are flexible and able to deflect in a direction opposite to that of the direction of rotation, the leading rod 17 having a first end 19 and a second end 21, the first end 19 secured by a leading rod mount 23 of the hub 13 located at a leading mount location 25, the trailing rod 27 has a base end 29 and a tip end 31, the tip end 31 connected with the second end 21 of the leading rod 17, and the base end 29 secured by a trailing rod mount 33 of the hub 13 located at a trailing mount location 35, and fabric sleeve 37 is stretched over the leading rod 17 and the trailing rod 27; the aerodynamic characteristics of each airfoil are configurable by modifying the orientation of the position/alignment of the leading red 17 relative to the trailing rod 27; and the invention including an assembly of airfoils attached to a hub 1

Abstract: The proposed device relates to the field of wind power engineering and can be used as a rotor in wind power installations with a vertical axis of rotation. The rotor includes a central hub, a bearing ring, including a plurality of segments, and blades vertically mounted on the ring in two tiers. The ring is connected to the hub by flexible tensioning members supported by fastening assemblies, secured on the hub and vertically spaced apart. The flexible tensioning members connected to the upper fastening assemblies are length-adjustable. The flexible tensioning members connected to the lower fastening assemblies are equipped with turnbuckles. The fastening assemblies are equipped with rotatable plates having horizontal pivot pins, which are vertically spaced apart. The proposed device makes it possible to improve the balancing of rotor.

Abstract: An automatic pot stirrer is provided that has a mount assembly. The mount assembly is mounted on a pot plate having slider clamps. The slider clamps engage the rim of the pot and are designed to accommodate differently dimensioned pots. The mount assembly supports a shaft that is operatively coupled to a motor at one end and threaded to a block at the other end. The block has opposed first and second block end walls and opposed first and second block paddle walls to which are connected paddles. The first and second block paddle walls may be disposed at about a forty-five degree angle to a second block end wall. The paddles are disposed at about a forty-five degree angle to the second block end wall such that the paddles lift food product from the bottom of the pot during operation of the automatic pot stirrer.

Abstract: A pitch lock system for a wind turbine with a rotor having at least one pitchable or at least partially pitchable blade connected to the rotor at a interface, the blade having an outer blade part and an inner blade part, the blade parts being interconnected at an interface, having a pitch bearing construction with a first bearing ring and a second bearing ring for pitching at least a part of the blade in relation to the rotor. The pitch lock system has a movable toothed segment for interacting with at least one toothed element, and where the pitch lock system further includes an actuator for activating and moving the movable toothed segment into engagement with the toothed element, and thus, locking the pitch bearing construction and thus locking the pitch bearing in the actual position.

Abstract: A pitch bearing for a wind turbine rotor includes a rotor hub and at least one rotor blade, the pitch bearing includes a cylindrical inner bearing ring connectable to a rotor blade of the wind turbine rotor, a cylindrical outer bearing ring connectable to the rotor hub of the wind turbine rotor and an annular reinforcement section for reinforcing the outer bearing ring. The annular reinforcement section adjoins the cylindrical outer bearing ring at its radial outer surface.

Abstract: A universal fan blade mount for connecting an integral fan blade assembly having two or three or four fan blades to a fan blade rotor, wherein the fan blade mount includes an adapter plate having a plurality of peripheral holes each for accommodating a respective mounting pin of the fan blade assembly, at least one of the holes being configured to accommodate a mounting pin of any one of the fan blade assemblies.

Abstract: A turbine rotor, e.g., for a drive turbine of a rotary atomizer, is disclosed having a rotatably supported turbine shaft with the potential for mounting an atomizer wheel, and having at least one drive turbine wheel having a plurality of turbine blades. The turbine blades of the drive turbine wheel may be impinged on during operation by a drive fluid in order to drive the turbine rotor. The drive turbine wheel may be designed for the drive fluid to axially impinge on the turbine blades. A complete drive turbine having such a turbine rotor is also disclosed, as well as a complete rotary atomizer and individual exemplary components of the drive turbine.

Abstract: A propeller assembly includes a hub and a blade installed in the hub. A bearing arrangement retains the blade in the hub and includes an outer bearing race at the hub including a first outer race radius and a second outer race radius different from the first outer race radius, connected by an outer relief The bearing arrangement further includes an inner bearing race at the blade including a first inner race radius and a second inner race radius different from the first inner race radius, connected by an inner relief A plurality of bearing balls are installed between the inner race and outer race thereby retaining the blade at the hub.

Abstract: A rotor blade for a rotor of a wind turbine is provided. The rotor blade comprises a blade root portion configured to transfer a load acting on the rotor blade to the rotor through a blade coupling assembly of the rotor, wherein the blade coupling assembly comprises a rotatable hub and a pitch bearing, and at least one reinforcement element disposed in the blade root portion of the rotor blade for stiffening the blade coupling assembly of the rotor.

Abstract: Quick attachable and detachable mounting arms for ceiling fans. A first version has flat headed fasteners initially attached to one end of mounting arms, with key-hole slots in the endshield of the ceiling fan motor. The user raises the mounting arm so that the flat headed fasteners fits through the larger openings in the keyhole slots and then pulls the mounting arm outward until the arm locks in place by the smaller opening portions of the keyhole slots. Rubber type gaskets and washers help lock and hold the mounting arms in place. The flat headed fasteners can also be located on the endshields with the keyhole slots on mounting arms. A second embodiment includes inwardly deformable springably snapable fasteners that can be located on the ends of the mounting arms which can deform inwardly and expand after passing through slots on the endshield of the rotor. Alternatively, the fasteners can be located on the bottom of the endshield with the receiving slots on the ends of the mounting arms.

Abstract: A rotor assembly for helicopter vehicles for providing an easy way of controlling pitch, roll and lift of the aircraft by respective servo actuators. The rotor assembly has a rotor shaft, and at least two rotor blades, a rotor head, and a non-rotating swash plate. The rotor assembly also includes a pitch hinge for each rotor blade connecting each rotor blade to the rotor head. The rotor assembly also includes a guide member for each rotor blade. As the rotor assembly rotates, the guide members are in substantial contact with an upper surface of the non-rotating swash plate. Forces such as magnetic and/or an aerodynamic forces are applied on the rotor blades and are sufficiently strong to create a valve effect on the pitch hinge, which in turn maintains contact between the guide members and the non-rotating swash plate.