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| Number | Title | Issue Date |
| 8113778 | Wind turbine blade stowage A wind turbine blade stowage arrangement includes a first section of the wind turbine blade nested at least partially inside a second section of the wind turbine blade; and a conformable spacer, arranged between the first and second sections of the wind turbine blad... | 02/14/2012 |
| 7985048 | Folding rotor for an autogyro device In one embodiment, a folding rotor blade for an autogyro device comprises a plurality of connected rotor members. When the folding rotor blade is in a compressed state the folding rotor blade has a compressed length, and some of the connected rotor members are dispo... | 07/26/2011 |
| 7581926 | Servo-controlled extender mechanism for extendable rotor blades for power generating wind and ocean current turbines A power generating system wherein a turbine is mounted on top of a tower or tethered underwater. The turbine includes a rotor having a main blade connected to a rotor hub and an extender section. An adjusting device positions the extender blade between a retracted p... | 09/01/2009 |
| 7396207 | Wind turbine A wind turbine comprising: (1) a support portion; (2) a hub that is mounted to rotate adjacent the support portion; and (3) at least one turbine blade mounted adjacent the hub and that comprises both a rotor and a sail that is mounted adjacent the rotor. The rotor m... | 07/08/2008 |
| 7338257 | Device for interacting with a fluid moving relative to the device and vehicle including such a device A device (10) for interacting with a fluid (12) moving relative to the device. The device comprises a body with an axis of rotation (22) and a periphery (24). The body is rotatable about the axis of rotation. The device also comprises a p... | 03/04/2008 |
| 7317260 | Wind flow estimation and tracking using tower dynamics A turbine control system for a variable speed electrical generator in a wind turbine mounted atop a support tower. The wind turbine converts wind energy into a driving torque applied to the generator. The control system includes a turbine support tower position sens... | 01/08/2008 |
| 7246998 | Mission replaceable rotor blade tip section A rotor blade includes a removable blade tip section which is mounted to an outboard rotor blade section by mechanically mounting a tip spar to a main blade spar with a spar interface section which bridges a butt joint between the blade spar and the tip spar. The sp... | 07/24/2007 |
| 7186083 | Wind energy conversion device A wind energy conversion device includes a propeller in which each of the propeller blades includes a proximal (radially inward) non-airfoil mounting section, a medial section and a distal tip section mounted to pivot relative to the medial section about a pitch axi... | 03/06/2007 |
| 7153100 | Ceiling fan with retractable fan blades A ceiling fan with retractable fan blades includes an electric motor operable to spin a rotor with a plurality of fan blades attached thereto. Each of the fan blades is operable to move between a closed position and an open position. A rotatable center ring is inclu... | 12/26/2006 |
| 7071578 | Wind turbine provided with a controller for adjusting active annular plane area and the operating method thereof A wind turbine which varies an active annular plane area by composing such that blades are attached to a cylindrical rotor movable in the radial direction of the rotor, the blades being reciprocated in the radial direction by means of a blade shifting mechanism conn... | 07/04/2006 |
| 7058556 | Adaptive aero-thermodynamic engine model An adaptive aero-thermodynamic engine model is disclosed which incorporates a plurality of model engine operating parameters, a plurality of nominal component efficiencies and corresponding efficiency modifier functions. The engine model is adapted by measuring a pl... | 06/06/2006 |
| 7004427 | Retractable lifting blades for aircraft A rotor blade assembly for providing vertical lift to an aircraft, having a rotor head and a plurality of blades, with each blade attached to a mechanism such as a cam surface, whereby movement of the mechanism causes the radial distance between the distal tip of th... | 02/28/2006 |
| 6984110 | Windmill blade and apparatus for generating power using the blade Disclosed is a wind power generating apparatus in which windmill blades are mounted in a multi-stage fashion to a rotating shaft while being spaced apart from one another to efficiently generate wind power. Each windmill blade includes blade bodies mounted to the ro... | 01/10/2006 |
| 6972498 | Variable diameter wind turbine rotor blades A system and method for changing wind turbine rotor diameters to meet changing wind speeds and control system loads is disclosed. The rotor blades on the wind turbine are able to adjust length by extensions nested within or containing the base blade. The blades can ... | 12/06/2005 |
| 6966755 | Compressor airfoils with movable tips Aspects of the invention relate to a compressor system for a turbine engine that not only allows for larger compressor blade tip clearances as the engine passes through non-standard operating conditions, but also minimizes clearances during normal engine operation, ... | 11/22/2005 |
| 6940185 | Advanced aerodynamic control system for a high output wind turbine An advanced aerodynamic control system for a wind turbine including a drive shaft and blade. The control system includes an air control system coupled to a duct that extends from a first end toward a second end of the blade. A slot extends along a portion of a surfa... | 09/06/2005 |
| 6923404 | Apparatus and methods for variable sweep body conformal wing with application to projectiles, missiles, and unmanned air vehicles An unmanned air vehicle (“UAV”) apparatus is configured to have a body and a body-conformal wing. The body-conformal wing is configured to variably sweep from a closed position to a fully deployed position. In the closed position, the body-conformal wing span is... | 08/02/2005 |
| 6923622 | Mechanism for extendable rotor blades for power generating wind and ocean current turbines and means for counter-balancing the extendable rotor blade A power generating system wherein a turbine is mounted on top of a tower or tethered underwater. The turbine includes a rotor having a main blade section connected to a rotor hub and an extender section. An adjusting device positions the extender section between a r... | 08/02/2005 |
| 6902370 | Telescoping wind turbine blade A wind turbine blade made of a fixed blade section with an integral mounting flange for attachment to a wind turbine hub. A moveable blade section is attached to the fixed blade section and is free to move in a longitudinal direction relative to the fixed blade sect... | 06/07/2005 |
| 6752595 | Propeller type windmill for power generation A plurality of wind turbine blades (3) are distributed equiangularly within a plane perpendicular to a horizontal rotating shaft (2) and around a hub (1) provided on the horizontal rotating shaft (2); the blade body of each turbine blade ... | 06/22/2004 |
| 6671590 | Method and system for active noise control of tiltrotor aircraft Methods and systems for reducing noise generated by rotating blades of a tiltrotor aircraft. A rotor-blade pitch angle associated with the tiltrotor aircraft can be controlled utilizing a swashplate connected to rotating blades of the tiltrotor aircraft. ... | 12/30/2003 |
| 6589017 | Aircraft airfoil assembly and method An aircraft rotatable airfoil assembly in the nature of a helicopter machine and having two airfoils diametrically disposed about an axis of rotation. Air baffles are mounted on the radially inner and radially outer ends of the airfoils and for blocking t... | 07/08/2003 |
| 6578793 | Method and apparatus for fiber strap termination A variable diameter rotor blade assembly includes a rotor hub with multiple rotor blades each having an outboard blade section telescopically mounted to an inboard blade section. A reeling assembly includes a strap drum that extends and retracts a strap a... | 06/17/2003 |
| 6454532 | Harmonic drive system for the retraction/extension of variable diameter rotor systems A drive system for a variable diameter rotor system includes a plurality of rotor blade assemblies with inner and outer blade segments. The outer blade segment being telescopically mounted to the inner blade segment. The VDR retraction/extension system in... | 09/24/2002 |
| 6398497 | Blade lock system for variable diameter rotor systems A VDR blade lock system includes a set of blade pins that are rigidly mounted into the outboard blade section and a set of mount pins that are rigidly mounted to a rotor mount assembly. A resilient bushing at least partially surrounds each pin to provide ... | 06/04/2002 |
| 6308632 | Deployable folded propeller assembly for aerial projectiles An apparatus for deploying a propeller assembly from a folded configuration to a deployed, operational configuration, the apparatus comprising a propeller assembly hub which in conjunction with a propeller hub nut maintains an aerodynamically efficient sh... | 10/30/2001 |
| 6152693 | Folding propeller A propeller (1) for commercial vessels as well as sailing ships with an auxiliary engine, having a hub (2) and at least two propeller blades (1) which are pivotally mounted in the hub (2). The blades (1) are pivotable between unfolded operating positions ... | 11/28/2000 |
| 6139268 | Turbine blade having an extensible tail A turbine blade having an extensible tail is described. The extensible tail is selectively positionable during engine operation, enabling fine-tuning for maximum power and efficiency during engine operation. During periods of operation exhibiting low Reyn... | 10/31/2000 |
| 6113350 | Vertical-axle power machine A vertical-axle wind power machine comprises a vertical axle, a plurality of jointed radial arms, a plurality of counterbalanced oblique blades at the support points thereof, a friction-rewarding rotary speed multiplying transmission, and an automatic rot... | 09/05/2000 |
| 6030177 | Drive system for a variable diameter tilt rotor A drive system for a variable diameter rotor system that includes a plurality of rotor blade assemblies with inner and outer blade segments. The outer blade segment being telescopically mounted to the inner blade segment. The drive system engaging a jacks... | 02/29/2000 |
| 6019578 | Variable diameter rotor blade actuation system A rotor blade actuation system is disclosed for controlling extension and retraction of an outboard blade section of a rotor blade by varying the speed and direction of rotation between a main rotor shaft and a blade actuation shaft. The rotor blade actua... | 02/01/2000 |
| 5743489 | Aircraft with two alternatingly operated propellers of different radius An aircraft has at least one drive motor coupled to first and second propellers for forward thrust of the aircraft. The first propeller is dimensioned for takeoff and landing conditions and for flight conditions below a predetermined first flight altitude... | 04/28/1998 |
| 5735670 | Rotor system having alternating length rotor blades and positioning means therefor for reducing blade-vortex interaction (BVI) noise A Variable Diameter Rotor (VDR) system (4) having telescoping odd and even blade assemblies (Ob, Eb) wherein the odd blade assemblies define a radial length RO and the even blade assemblies define a radial length RE. | 04/07/1998 |
| 5655879 | Mounting arrangement for variable diameter rotor blade assemblies A mounting arrangement (100) for a Variable Diameter Rotor blade assembly (16) having an outer blade segment telescopically mounting to a torque tube member (24), and connecting means (70) for transferring centrifugal loads of the outer blade segment (22)... | 08/12/1997 |
| 5642982 | Retraction/extension mechanism for variable diameter rotors A retraction/extension mechanism (70) for a Variable Diameter Rotor system (10), the Variable Diameter Rotor system (10) having a plurality of rotor blade assemblies (16) mounted to and rotating with a rotor hub assembly (18) about an axis of rotation (20... | 07/01/1997 |
| 5636969 | Torque tube/spar assembly for variable diameter helicopter rotors A torque tube/spar assembly (100) for transferring operational loads of a Variable Diameter Rotor blade assembly (16) to a rotor hub assembly (18) and includes a torque tube member (24), a spar member (30) and a bearing assembly (40a, 40b) for telescopica... | 06/10/1997 |
| 5620303 | Rotor system having alternating length rotor blades for reducing blade-vortex interaction (BVI) noise A rotor system (4) having odd and even blade assemblies (Ob, Eb) mounting to and rotating with a rotor hub assembly (6) wherein the odd blade assemblies (Ob) define a radial length RO, and the even blade assembl... | 04/15/1997 |
| 5620304 | Rotor system having alternating length rotor blades and positioning means therefor for reducing blade-vortex interaction (BVI) noise A Variable Diameter Rotor (VDR) system (4) having telescoping odd and even blade assemblies (Ob, Eb) wherein the odd blade assemblies define a radial length RO and the even blade assemblies define a radial length RE. | 04/15/1997 |
| 5593280 | Propeller for boat In a propeller for a boat, a plurality of stationary blades and a plurality of variable blades are alternately disposed around an outer periphery of a propeller boss. Exhaust passages are formed in the propeller boss to axially pass through the propeller ... | 01/14/1997 |
| 5562413 | Variable propeller for boat A plurality of blade shafts spline-connected to bosses of a plurality of propeller blades are rotatably carried on a propeller boss parallel to the axis of the boss, the propeller blades being rotated so as to increase the propeller-diameter D according t... | 10/08/1996 |
