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| Number | Title | Issue Date |
| 7303329 | Mixing rod with U-shaped member A mixing device for mixing resins and other liquids. The device comprises of a first elongated member which includes a drill end being adaptable to a conventional drill motor chuck and first connection end. A U-shaped member coupled to the first elongated member, wh... | 12/04/2007 |
| 7223073 | Boat propeller A boat propeller comprising a central hub member and an inner hub assembly that defines a longitudinally extending bore having an inner surface. The exterior surface of the central hub member is sized and shaped for disposition therein the bore of the inner hub asse... | 05/29/2007 |
| 7134840 | Rotor system for a remotely controlled aircraft A remotely controllable flying machine, such as a remote control ultralight helicopter, has at least one rotor blade (104), the pitch (α) of which may be adjusted. The adjustment of the pitch (α) of the at least one rotor blade is achieved by means of a for... | 11/14/2006 |
| 7121505 | Method of control for toy aircraft The invention described here offers a low-cost method of remote flight control suitable for use in toy airplanes and ornithopters (flapping-wing aircraft). To accomplish this, the aircraft is powered by a reversible electric motor. The propeller or flapping wing pro... | 10/17/2006 |
| 6994523 | Air blower apparatus having blades with outer peripheral bends An air blower apparatus is provided including a hub which is a center of rotation, and a plurality of blades disposed along an outer peripheral surface of the hub and having leading and trailing edges and where both an outer peripheral end of the leading edge and an... | 02/07/2006 |
| 6113352 | Hingeless rotor with precompressed half-bearings supporting blade root oversleeves on torsionable blade root strips Each blade of the rotor has a rigid root oversleeve connected to a torsionable and flexible root strip by two laminated, spherical support half bearings, fixed by their outer frame with double rigid horns the lateral ends of which facing each other on eac... | 09/05/2000 |
| 6065933 | Folding rotor blade/propeller drive and pitch control actuator A propulsion blade retraction and pitch control apparatus includes a hollow primary drive shaft, a pitch control gear assembly mounted, within a propeller hub, to the primary drive shaft, a radially spaced array of pitch control stub shafts mounted to, in... | 05/23/2000 |
| 5907192 | Method and system for wind turbine braking Stored rotational energy in an operating variable speed wind turbine is used to pitch blades and brake the wind turbine in the event of utility power grid failure. In one embodiment, a generator IGBT converter and the main power utility grid IGBT converte... | 05/25/1999 |
| 5863230 | Universal marine drive apparatus and uses thereof Described is novel apparatus for rendering a watercraft propulsion system universal. One embodiment of the invention comprises a rotary shaft; a propeller detachably attached to one end of the rotary shaft, the other end of the rotary shaft being configur... | 01/26/1999 |
| 5685694 | Air driven turbine having a blade pitch changing mechanism including overspeed protection An air driven turbine having variable pitched blades is provided that includes a pitch change mechanism for adjusting the pitch of the blades during either rotating or non-rotating operational modes of the air driven turbine. The pitch control mechanism i... | 11/11/1997 |
| 5297934 | Compensation for kinematic foreshortening effect in pitch control system for rotary wing aircraft A rotor for a rotary wing aircraft includes a rotor shaft driveably connected to a power source, a rotor hub connected to the rotor shaft, rotor arms inclined with respect to a plane perpendicular to the rotor axis and pitch shafts supported on each rotor... | 03/29/1994 |
| 5122034 | Variable pitch fan A fan assembly has variable pitch blades adjustable from outside the assembly while the fan is operating so as to alter the volume and direction of the induced airflow. The fan blades have an airfoil configuration such that air is moved by the fan in eith... | 06/16/1992 |
| 5102301 | Variable pitch propeller blades, hub and drive and adjusting mechanism therefor Stern drive propulsion systems for boats in which there is at least one prime mover (outboard or inboard motor) and a power train for rotating at least one propeller in the water to propel the boat are improved by inclusion therein of novel variable pitch... | 04/07/1992 |
| 5096381 | Regulating device for maintaining constant the rotary speed in turbines The invention relates to a regulating device for maintaining constant the rotary speed in turbines of the type comprising a turbine hub and a number of turbine blades which are axially, but rotatably connected to the hub and have such a shape and are so a... | 03/17/1992 |
| 5073134 | Boat drive with adjustable pitch propeller A boat drive of the type in which a housing outside the hull of the board and below the water level receives a hollow propeller shaft driven by a drive shaft connected to the propeller shaft by a transmission. The hub of a variable pitch propeller is moun... | 12/17/1991 |
| 5022821 | Variable pitch fan A fan assembly has variable pitch blades adjustable from outside the assembly while the fan is operating so as to alter the volume and direction of the induced airflow. The fan blades have an airfoil configuration such that air is moved by a fan in either... | 06/11/1991 |
| 4805850 | Helicopter rotor control systems A helicopter rotor control system includes a plurality of control rods (31) extending downwardly from pitch control means (24) through a hollow rotor drive shaft (12) and gearbox (14) for connection directly to individual actuators (36) located generally ... | 02/21/1989 |
| 4521158 | Fluid-flow machine A fluid-flow machine, particularly of the hydraulic propeller-pump type, comprises a central hub, a bearing support fixed to the hub for rotation therewith, a plurality of blades distributed symmetrically around the hub, each blade having a pivotable blad... | 06/04/1985 |
