Abstract: A high-efficiency windmill includes an inner rotor having propellers for capturing wind blowing along a wind direction to push the inner rotor about an axis, and an outer rotor rotatable about the same axis independently of the inner rotor radially exteriorly of the inner rotor. The outer rotor is self-positionable in a rotor position about the axis in response to the wind direction. The outer rotor has an airfoil-shaped vane having a forward surface generally facing the wind in the rotor position, and a rear surface generally facing away from the wind in the rotor position. The rear surface creates a negative pressure zone by accelerating the wind across the rear surface. At least one of the propellers adjacent the airfoil-shaped vane in the rotor position is pulled by the negative pressure zone to assist the wind in pushing the propellers about the axis.

Abstract: The present invention provides a vertical-axis windpower fan unit using a central axle having modulized design for assembling or disassembling quickly and includes supporting arms with capability of weight adjustment so as to balance the rotation of the fan unit. In one embodiment, the present invention further provides a coaxial fan module comprising a plurality of fan units coupled sequentially wherein a blade of each fan unit is disposed in the middle position with respect to the two blades of the adjacent fan unit for reducing unbalance and eliminating vibrational noise while the fan module is rotating. In addition, in another embodiment, the present invention further provides a power generating system comprising the coaxial fan module and a power generator unit coupled to the coaxial fan module so as to generate electricity.

Abstract: The invention provides a fuel cell compressor system that comprises a motor, including a motor shaft driven by the motor; a drive housing at least partially surrounding the motor shaft; a first gear set driven by the motor shaft; a carrier torque tube driven by the first gear set; and an impeller. The impeller includes an impeller shaft driven by the second gear set, so that the impeller shaft is configured to rotate at a speed greater than motor speed. Embodiments of the invention may also be used with a multi-stage compressor that allows, for example, first and second impellers to rotate at different speeds. Embodiments of the invention may also include removal of a gear set driving the carrier torque tube or the impeller shaft, so that the impeller shaft speed is divided between one or more bearings supporting the carrier torque tube and one or more bearings supporting the impeller shaft.

Abstract: A helicopter includes a system to effect motion in a horizontal dimension thereby to direct the desired direction. The rotor blades are driven by a rotor shaft and which is hinge mounted on this rotor shaft, such that the angle between the plane of rotation of the main rotor and the rotor shaft may vary. A control for moving the angle of incidence of at least one blade of the rotor cyclically along at least part of a 360-degree rotation path around the rotor shaft. This causes a variation in a lift force of the blade along at least part of the rotations path. This causes the body to be urged in a relatively horizontal direction from a relative position of rest. The control includes an actuator for engaging with an assembly depending from the rotor, the inter-engagement of the actuator and assembly effecting a change in the angle of incidence of at least the one blade of the rotor. The system includes a rotor, preferably complemented with a stabilizer rotor.

Abstract: The present invention is vertical axis fluid flow turbine system for generating an alternative fuel. The turbines of the present invention are centered between at least two support structures so that the rotor holding the hub and the blades is perpendicular to the ground, rooftop, or the floor of a body of water and the axis of the blades coming from the hub are parallel to the ground, rooftop, floating structure, or the floor of a body of water. The turbines are secured to the support structures using struts. The struts are attached to each support structure and to the nacelle of each turbine. Attaching each turbine in this manner allows the turbines of the present invention to be stacked one on top of the other, that in turns minimizes the footprint of the vertical axis fluid flow turbine system.

Abstract: A wind energy device is formed of one or more units. Each unit is formed of funnel or cannon-shaped receptacles for receiving wind are assembled in a pin-wheel fashion. The receptacles are formed as units. Each unit, which includes two cannon-shaped receptacles, is connected so as to be longitudinally aligned with slanted opening faces, preferably at a 45 degree angle, facing outward to receive wind therein and with two additional cannon-shaped receptacles located on each side face of the two aligned cannon-shaped receptacles preferably at the point where the two connect to each other.

Abstract: A vertical shaft type windmill with arcuate hook shaped vane blade is composed of a tower, a rotary stand, a wind vane assembly, a generator and an electric controller. The present invention makes use of the wind power to drive the aforesaid structure to produce the mechanical power which being afterwards converted into the electrical power to supply various loads such as the domestic appliances, the public and roadway lighting. The structure is simply constructed, easy to fabricate and operate.

Abstract: A rotor hub fairing system includes an upper hub fairing, a lower hub fairing and a shaft fairing therebetween. The rotor hub fairing system is attached to the counter-rotating, coaxial rotor system through a bearing arrangement such that the shaft fairing may be positioned at an azimuthal position about the main rotor axis of rotation relative the airframe by a de-rotation system. The de-rotation system controls the position of the shaft fairing about the axis of rotation such that the shaft fairing is prevented from rotating freely in unison with either shaft as may otherwise result during some flight regimes.

Abstract: A de-rotation system includes a first ring gear defined about an axis of rotation, a second ring gear defined about the axis of rotation and a gear set in meshing engagement with the first ring gear and the second ring gear to control a position of a housing about the axis of rotation.

Abstract: The Andrews Turbine is a vertical axis turbine (FIGS. 4/8 and 5/8). The blades are unique in that they are wider on the trailing edge than the leading edge and they contain vertical partitions within the blade (FIG. 1/8). This design offers more resistance on the trailing edge and keeps the blade turning in the same direction. The vertical partitions create turbulence within the blade, imparting increased torque to the drive axle. Another unique feature is the vertical axle with horizontal blades (FIGS. 4/8 and 5/8). With numerous equally offset blades, a symmetric distribution of the blades is created, referred to as a rotor set (FIG. 3/8). By adding rotor sets (FIG. 6/8) the power of the Andrews Turbine is increased. The Andrews Turbine can be used as a wind or water turbine and as a vehicle turbine without changing the design.

Abstract: A shaftless vertical axis wind turbine has a stationary hollow core having inner and outer circular walls with a void between the inner and outer walls. A rotor is rotatably supported about the core and has a plurality of radially extending rotor arms each having a wind engaging rotor blade located at a distal end.

Abstract: A rotor hub fairing system includes an upper hub fairing, a lower hub fairing and a shaft fairing therebetween. The rotor hub fairing system reduces the total drag on a dual, counter-rotating, coaxial rotor system. Other aerodynamic structures may be mounted to the shaft fairing, hub fairings and airframe to facilitate flow around the upper and lower hub fairings to reduce flow separation and drag.

Abstract: A turbine (5) having at least two sets of co-axially mounted, rotatable blades (10, 15) arranged so that one set cannot eclipse another. Preferably, the sets of blades (10, 15) are contra-rotatable. Each set of blades (10, 15) may be operable to extract similar amounts of energy, thereby to minimise the net reactive torque.

Abstract: A connection structure is applied to a serial fan assembly, which includes an upstream fan and a downstream fan. The upstream fan and the downstream fan have different sizes. The connection structure connects the upstream fan and the downstream fan so that the upstream fan and the downstream fan are arranged in series. The connection structure has a housing, a base and a plurality of ribs for connecting the base, and the housing is formed with an air guiding passage and a chamber. The upstream fan or the downstream fan is accommodated in the chamber or the air guiding passage is located between the upstream fan and the downstream fan.

Abstract: A rotor system (12) for a helicopter (10) includes a rotating shaft (82). A gimbaled hub assembly (56) is coupled to the rotating shaft (82). Rotating blades (24) and non-rotating blades (33) are coupled to the gimbaled hub assembly (56). The non-rotating blades (33) provide lift for the helicopter (10) in forward flight unloading the rotating blades. The rotating and non-rotating blades (24, 33) provide equal and opposite rolling moments for lift offset operation.

Abstract: A wind power installation comprising at least two rotors which are arranged one behind the other and of which the first rotor which is arranged in front of the second rotor is of a smaller diameter than the second rotor.

Abstract: A dual rotor wind turbine according to the present invention includes a rotatable drive shaft, a first rotor assembly connected to the drive shaft, a second independently-rotating rotor assembly coupled to the drive shaft rearward of the first rotor assembly, a first stage generator coupled to the drive shaft, a second stage generator operatively connected to the second rotor assembly, a housing wherein the generators are situated, a rotary base, and a tail. In use, the rotary base allows the tail to optimally position the rotors for collecting wind. Wind rotates the first rotor assembly, causing the drive shaft to rotate and operate the first stage generator. Wind passing through and directed off the first rotor assembly rotates the second rotor assembly, independent of the first rotor assembly, operating the second stage generator. The two stage generators are any combination of AC or DC electrical generators, pumps, and compressors.

Abstract: A fan assembly includes a vertical axis wind turbine (VAWT) which is coupled to an air extraction or air supply fan. The VAWT is located above and is coupled coaxially to the fan. The fan assembly also includes an auxiliary turbine to provide start-up torque to initiate rotation of the VAWT. The VAWT is typically a Darrieus-type turbine and the auxiliary turbine is typically a Savonius-type turbine. In the preferred embodiments, the fan assembly includes a rotational speed governor to avoid damage to the turbine and/or fan in high winds.

Abstract: A constant-speed twin spool turboprop unit including a twin spool gas generator having a low-pressure spool and a high-pressure spool each including a compressor and a turbine which drives the compressor, is described in which at least one propeller of the unit is driven by at least the high-pressure spool of the gas generator.

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 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: In a preferred embodiment, a tail rotor assembly for a helicopter, which includes: a first rotor disposed on a first side of the distal end of a tail boom of the helicopter and rotatable in a first geometric plane; and a second rotor disposed on a second side of the distal end of the tail boom, the second rotor being rotatable in a second geometric plane.

Abstract: There is provided a rotor arrangement comprising primary blades 16 mounted on a support disc 15 and secondary blades 18 mounted on a support disc 17. The secondary blades are disposed between respective primary blades with some axial overlap. The set of secondary blades is movable relative to the set of primary blades so that each secondary blade can be moved between end positions abutting the associated pair of primary blades.

Abstract: An over-drive gear device for use with a wind generator of a windmill, which includes a bevel gear member connected to a rotary shaft of the windmill, first and second vertical axle shafts extending from the bevel gear, an internal gear member connected to the second vertical axle shaft, a planet gear spider connected to the first vertical axle shaft and including a plurality of planet gears, and a sun gear disposed in a geared relationship with the plurality of auxiliary gears, wherein the wind generator is coaxially connected to the main gear and the over-drive gear device effectively increases the total efficiency of the wind generator of the propeller-type windmill.

Abstract: A propeller for an aircraft or fan comprises an even number of propeller blades, at least six in number, which are unsymmetrically arranged around the axis of roation of the propeller in two circumferentially equidistantly spaced groups of at least three blades each. Each blade of each group is paired and longitudinally aligned with a respective blade of another group at the opposite side of the axis of rotation of the propeller, and each two next adjacent blades in each group are offset relative to each other by a spacing angle of between about 15.degree. and 40.degree.. For a selected speed of rotation of the propeller corresponding to a particular blade-tip Mach number, the magnitude of the spacing angle is inversely related to the magnitude of that blade-tip Mach number, for effecting a reduction of the level of the rotational sound harmonics by interference.

Abstract: A propeller for an aircraft or a blower or fan, wherein the propeller blades are intended for operation at speeds characterized by blade tip Mach numbers in the range of about 0.4 to 0.8, comprises at least two pairs of diametrically opposed blades, the blade pairs being arranged at a spacing angle .epsilon. of between about 15.degree. and 50.degree. between them, and the magnitude of the spacing angle being inversely related to the magnitude of the blade tip Mach numbers, thereby to effect a reduction in the level of the rotational sound harmonics by interference. The pairs of blades may be axially spaced from one another, i.e., arranged in respective spaced parallel planes of rotation, shifted, with the rear one of two adjacent blades leading in the direction of rotation.

Abstract: The invention relates to a rotor system, particularly a boat propeller system, which consists of a main propeller and a turbo unit in the form of a fore-propeller and a turbine mechanically coupled thereto, the turbo unit being freely rotatably journalled.

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: Electric power generator for mounting on a vehicle or the like, consisting of a tubular shroud within which is coaxially mounted a spool, the space between the spool and shroud being a venturi and containing a plurality of spaced pairs of blade rings.

Abstract: An electric fan including a casing having an air supply opening at a front part and an air suction opening at a rear part and an air passage in the casing from the air suction opening to the air supply opening; fan blades placed in the air passage or near the air suction opening as an inlet to provide air flow in the air passage from the air suction opening to the air supply opening; a first motor for rotating the fan blades; a circular air directing grille having many slits to cover the front part of the air supply opening of the casing in gyratory manner; a driving roll made of an elastic material placed on the peripheral part of air directing grille to contact the driving roll with the peripheral part of the grille with a spring force; a second motor for driving the driving roll to turn the air directing grille and the air directing grille can be rotated in stable condition under contacting of the driving roll with the peripheral surface of the air directing grille with the spring force if desired.

Abstract: The disclosure teaches improvements in vertical axis wind turbine apparatus. The improved apparatus has a vertically rising exoskeletal frame which permits modular addition of supplemental turbine components to the apparatus. The apparatus is self-supporting, needing no bracing external of the frame, is relatively small and light weight, has vertical standards in the frame, a plurality of sets of horizontal stretchers integrating the standards and means for bracing the frame elements. The specification teaches the support of the axially disposed drive shaft and associated turbines by means of upwardly and radially inwardly extending arms which distribute the weight of the operating structure to the exoskeletal frame. Non-bearing guide means are provided to prevent lateral movement of the shaft and associated turbines. The apparatus may be provided in kit form which can be readily assembled or disassembled according to need.

Abstract: A jet aircraft is equipped with powered helicopter type rotor blades and control mechanisms whereby it can take off and land vertically, yet in horizontal flight can operate at speeds and altitudes typical of jet aircraft. The rotor blades are foldably retractable to a compact locked, trailing position for horizontal travel and are readily unfoldable by a manually operated control mechanism within the aircraft. While the rotors are rotating, the blade pitch can be selectively controlled and, on power failure, will be automatically controlled to provide for same direction autogyro rotation. In one form, the wings and stabilizers are tiltable between substantially horizontal positions for normal horizontal flight and substantially vertical positions for vertical flight. The craft is ground supported by flexible legs.