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| Number | Title | Issue Date |
| 7931439 | Coaxial rotor system for helicopters An improved coaxial rotor assembly for a helicopter includes an upper rotor system having a multiple of upper rotor blades each having outer tips and mounted on and extending outwards from a central rotor shaft and a lower rotor system having a multiple of lower rot... | 04/26/2011 |
| 7402021 | Fluid activated wheel/generator pair The invention provides a pair of co-rotating fluid powered wheel and generator pairs each rotating about a single vertical axis. Each wheel/generator is mounted on a respective axle one of which is solid and the other tubular. Separation of fluid flow into 2 streams... | 07/22/2008 |
| 7384239 | Drive device for a windmill provided with two counter-rotative propellers The drive device is provided for inclusion in a windmill with two counter-rotating screws. The shafts of the screws are each connected to a spindle of an epicyclical gearbox, the third spindle providing the energy for the user. The device further comprises a brake d... | 06/10/2008 |
| 7334981 | Counter-rotating gas turbine engine and method of assembling same A method for assembling a gas turbine engine that includes providing a low-pressure turbine inner rotor that includes a first plurality of rows of turbine blades configured to rotate in a first rotational direction, providing a low-pressure turbine outer rotor that ... | 02/26/2008 |
| 7234914 | Apparatus and method for enhancing lift produced by an airfoil A compressor or pump employs principles of unsteady delayed stall to enhance the head increase produced by the compressor or pump. Plural airfoil-shaped lifting elements are spaced from each other in a cascade and the fluid is directed into the cascade by a device t... | 06/26/2007 |
| 7229251 | Rotor hub fairing system for a counter-rotating, coaxial rotor system 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 sized and configured to reduce the overall drag on a dual, counter-rotating, coaxial rotor system. Preferably, the rotor h... | 06/12/2007 |
| 7210651 | Compact co-axial rotor system for a rotary wing aircraft and a control system therefor A dual, counter rotating, coaxial rotor system provides an upper and lower rotor system, with a reduced axial rotor separation distance along a common axis by way of rotor tip position sensing and rotor position controls to avoid tip contact. ... | 05/01/2007 |
| 7195447 | Gas turbine engine and method of assembling same A method for assembling a gas turbine engine that includes providing a low-pressure turbine inner rotor that includes a first plurality of turbine blade rows configured to rotate in a first direction, providing a low-pressure turbine outer rotor that includes a seco... | 03/27/2007 |
| 7186073 | Counter-rotating gas turbine engine and method of assembling same A method for assembling a gas turbine engine includes providing a low-pressure turbine inner rotor that includes at least a first pair of adjacent rows of turbine blades that are configured to rotate in a first direction providing a low-pressure turbine outer rotor ... | 03/06/2007 |
| 7185484 | Methods and apparatus for assembling a gas turbine engine Methods and apparatus for assembling a gas turbine engine are provided. The method includes coupling a first turbine shaft that includes m rows of turbine blades within the gas turbine such that the first turbine shaft is rotatable in a first direction, and coupling... | 03/06/2007 |
| 7175399 | Serial ventilation device An apparatus for a serial ventilation device that increases airflow compared to conventional devices without increasing the size is presented. The first ventilator is mounted on the intake opening side of the serial ventilation device, with the front surface of its ... | 02/13/2007 |
| 7156611 | Counterrotating axial blower An axial-flow fan with double impellers is provided that can produce a larger amount of air and a higher static pressure than can be achieved with conventional fans. The axial-flow fan with double impellers has a first axial-flow fan unit and a second axial-flow fan... | 01/02/2007 |
| 7118340 | Swashplate and pitch link arrangement for a coaxial counter rotating rotor system A coaxial counter-rotating rotor system for a hybrid aircraft includes an upper swashplate assembly and a lower swashplate assembly with a coaxial transmission system therebetween. Movement of the upper and lower swashplate assembly is reflected about a midplane of ... | 10/10/2006 |
| 7097415 | Low-pressure turbine of a turbomachine A low-pressure turbine of a turbomachine, the turbomachine comprising a high-pressure turbine disposed upstream from the low-pressure turbine, and an exhaust casing disposed downstream from the low-pressure turbine, the low-pressure turbine comprising a rotor secure... | 08/29/2006 |
| 7083142 | Compact co-axial rotor system for a rotary wing aircraft and a control system thereof A dual, counter rotating, coaxial rotor system provides an upper and lower rotor system, with a reduced axial rotor separation distance along a common axis by way of rotor tip position sensing and rotor position controls to avoid tip contact. ... | 08/01/2006 |
| 7059830 | Axial-flow serial fan This specification discloses a serial fan comprising a plurality of rotor vanes, one or more supports and a frame. Each of the rotor vanes comprises an inlet, an outlet, and one or more blades. Each support supports at least one of the rotor vanes so that the corres... | 06/13/2006 |
| 7048496 | Turbine cooling, purge, and sealing system A rotor system for a gas turbine engine is provided having an outer rotor which includes an annular outer spool that comprises at least one ring portion of increased thickness with respect to the remainder of the outer spool, attached to a relatively thinner, axiall... | 05/23/2006 |
| 7008189 | Centrifugal fan A centrifugal fan and a rotor for a centrifugal fan comprising axial blades, straight blades, and a hub having a radius that increases as a function of distance from the fan inlet. ... | 03/07/2006 |
| 6994071 | Two-cycle engine for counter-rotation especially for aviation applications A counter-rotating 2 cycle piston engine with a combustion chamber and an output shaft rotatably mounted to rotate independently about the same propeller centerline of an aircraft. The Internal combustion power is transmitted to the output shaft by means of a conven... | 02/07/2006 |
| 6966804 | Propulsion unit of marine vessel A marine vessel includes a rudder support structure attached to its hull and a rudder device attached to the rudder support structure in a manner allowing pivotal movement of the rudder device relative to the rudder support structure. A first drive train includes a ... | 11/22/2005 |
| 6928977 | Adapter, to interface counter-rotating torque producing engine mechanisms with stationary support accessories, for torque free output and torque sensitive environments The present invention is a novel hydraulic/electric, rotating interface for torque producing engines, including internal combustion engines, which enables a rigidly mounted motor to isolate the power/torque producing components from other stationary accessories, to ... | 08/16/2005 |
| 6926400 | Media incising printer A printer with a media incising device operably secured thereto and a related method for using the printer is disclosed. The media control device is in communication with a printer controller that commands the media incising device to engage the media. The disclosed... | 08/09/2005 |
| 6910483 | Double-ended blower and volutes therefor A double-ended variable speed blower for Continuous Positive Airway Pressure (CPAP) ventilation of patients includes two impellers in the gas flow path that cooperatively pressurize gas to desired pressure and flow characteristics. Thus, the double-ended blower can ... | 06/28/2005 |
| 6808366 | Fluid flow powered dynamo with lobed rotors Multiple, timed three-lobed rotor that are more efficient yet uncomplicated and easy to produce. A rotor lobe with additional reaction surfaces near the tip to increase the angle of rotation that produces power. A “flow through” rotor having end plates that faci... | 10/26/2004 |
| 6763652 | Variable torque split aircraft gas turbine engine counter rotating low pressure turbines An aircraft gas turbine engine includes a low pressure turbine having a low pressure turbine flowpath and low pressure inner and outer shaft turbines with counter rotatable low pressure inner and outer shaft turbine rotors, respectively. The low pressure inner and o... | 07/20/2004 |
| 6761144 | Rotary engine with counter-rotating housing and output shaft mounted on stationary spindle A counter-rotating rotary-piston engine has an output shaft with a cylindrical inner cavity rotatably mounted on a single support spindle in the frame of an aircraft. The output shaft extends substantially through the length of the engine block, which is suitably jo... | 07/13/2004 |
| 6684626 | Aircraft gas turbine engine with control vanes for counter rotating low pressure turbines An aircraft gas turbine engine includes a low pressure turbine having a low pressure turbine flowpath and counter rotatable low pressure inner and outer shaft rotors having inner and outer shafts, respectively. The low pressure inner and outer shaft rotor... | 02/03/2004 |
| 6655917 | Method and apparatus for serial coolant flow control The present invention provides a method and apparatus for serial coolant flow control. In one embodiment of the present invention, two or more sets of angled rotating blades are used in series to increase the coolant pressure and flow. In this embodiment,... | 12/02/2003 |
| 6602054 | Fluid motor apparatus for amplifying thrust An array of axially spaced rotating airfoils having funnel strips on the blades to increase the lift to drag ratio and generate thrust are rotatably driven by small motors with rotating airfoils, also having funnel strips to enhance thrust. The small moto... | 08/05/2003 |
| 6543726 | Fluid flow straightening techniques Contra-rotating members are used for straightening a fluid flow. The members may take the form of propellers, fans or impellers. The contra-rotation eliminates tangential flow components, and most importantly, eliminates cylindrical vortices. The present ... | 04/08/2003 |
| 6537019 | Fan assembly and method A fan assembly includes a first fan and a second fan. The first fan has a first housing and a first blade assembly. The first blade assembly includes a plurality of blades attached to a hub, and is configured to rotate about a first axis of rotation in a ... | 03/25/2003 |
| 6224324 | Axial-flow turbine An axial turbine or axial compressor with bladed rotors (6, 7) rotating in opposite directions about a common axis, in particular for the expansion of steam and hot gases or for compressing gases, with mutually adjacent bladed rotors (6, 7) being mutually... | 05/01/2001 |
| 6220906 | Marine propulsion assembly A marine propulsion assembly comprises a drive shaft, a first propeller fixed to the drive shaft and turnable therewith in a first direction, an annular array of gear teeth disposed on the first propeller and turnable therewith, a second propeller aligned... | 04/24/2001 |
| 6193466 | Counter rotating bypass propeller A propulsion device having fins rotating in opposing directions which are adjustable to avoid collision yet which provide opposing strokes similar to fishtails. At least one adjustable fin is connected at an end of a rotatable hollow primary axle which co... | 02/27/2001 |
| 6056509 | Contra-rotating bearing device for contra-rotating propeller A hollow portion is provided on the core of an inner shaft (2) to form an oil feed port (3), a plurality of oil feed holes (4) which are connected with both of the outer peripheral face of the inner shaft (2) within a range (L) of the bearing surface of t... | 05/02/2000 |
| 5931640 | Oppositely skewed counter-rotating fans A counter-rotating fan which comprises a forward-skewed upstream rotor and a backskewed downstream rotor. The counter-rotating fan may be used in a cooling module with a heat exchanger, for example as an engine cooling fan in a vehicle.... | 08/03/1999 |
| 5820345 | Split rotor shaft driven lift fan A split fan for providing lift for an aircraft is described. In one embodiment, a main engine shaft extends to the split fan, and a portion of the split fan is located at an elevation above the main engine shaft and a portion of the split fan is located a... | 10/13/1998 |
| 5800223 | Marine propulsion device A marine propulsion device improves the handling characteristics and the responsiveness of the watercraft on which it is used. The propulsion device includes a pair of counter-rotating propellers. At least the blades of the front propeller each have a mea... | 09/01/1998 |
| 5601257 | Air vehicle yaw control system The yaw control in an air vehicle having counter rotating rotors is provided by selectively and controllably applying a frictional drag or braking force to drive gears for the two rotors. Each of the drive gears includes a friction surface. Friction pads ... | 02/11/1997 |
| 5443590 | Rotatable turbine frame A rotatable turbine frame includes annular outer and inner bands having a plurality of circumferentially spaced apart struts extending therebetween. An annular drive shaft is fixedly joined to the inner band for transmitting output torque therefrom, and t... | 08/22/1995 |
