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| Number | Title | Issue Date |
| 7354247 | Blade for a rotor of a wind energy turbine A blade for a rotor of a wind energy turbine includes opposite upper and lower faces, opposite leading and trailing edges connecting the upper and lower and at least one air outlet opening arranged on at least one of the upper face, the lower face and the trailing e... | 04/08/2008 |
| 7231997 | Hybrid drive powered lift platform An air-based thrust recovery system for use in a powered lift platform utilizing fixed-pitch propellers is provided. The system utilizes an air compressor coupled to the drive motor of the platform and an on-board, high pressure tank for air storage. The fixed-pitch... | 06/19/2007 |
| 7134631 | Vorticity cancellation at trailing edge for induced drag elimination Wing tip vortices are evident from airliner vapor trails, and helicopter blade slap. Elliptically loaded high aspect ratio tapered wings have minimum induced drag but cannot eliminate it. Different methods are disclosed herein, for upper and lower surface boundary l... | 11/14/2006 |
| 7134837 | Cavitation alleviation and line cutting device A line cutting device for use with a hydrodynamic propeller has a blade (5) fixed to a vessel having the propeller. Three rotating blades (22) extend from a hub fixed around the propeller's shaft. The fixed and rotating blades are arranged for line she... | 11/14/2006 |
| 6948906 | Rotor blade system with reduced blade-vortex interaction noise A rotor blade system with reduced blade-vortex interaction noise includes a plurality of tube members embedded in proximity to a tip of each rotor blade. The inlets of the tube members are arrayed at the leading edge of the blade slightly above the chord plane, whil... | 09/27/2005 |
| 6932569 | Active control of multi-element rotor blade airfoils A multi-element rotor blade includes an individually controllable main element and fixed aerodynamic surface in an aerodynamically efficient location relative to the main element. The main element is controlled to locate the fixed aerodynamic surface in a position t... | 08/23/2005 |
| 6881034 | Leaf rotor A rotor which has a cone shaped tube with a large air input end and a smaller air output end. The cone shaped tube increases air pressure as the air passes through the tube and provides more lift. ... | 04/19/2005 |
| 6821090 | Gust alleviation/flutter suppression device An active control device is disclosed comprising an array of actively controlled oscillating air jets disposed on an aircraft structure. In a preferred embodiment, the device senses parameters associated with incipient unsteady aerodynamic excitation, such as free s... | 11/23/2004 |
| 6543719 | Oscillating air jets for implementing blade variable twist, enhancing engine and blade efficiency, and reducing drag, vibration, download and ir signature A porous surface on an aircraft structure driven with oscillating positive and negative pressures is used as an active control device for attenuating negative aerodynamic interactions. The porous surfaces can be driven with positive and negative pressures... | 04/08/2003 |
| 6471477 | Jet actuators for aerodynamic surfaces A jet actuator positioned within a hollow space in an aerodynamic structure for controlling the flow over an aerodynamic surface thereof includes a movable member linearly displaced by a voice coil mechanism and a flexible diaphragm defining a compression... | 10/29/2002 |
| 6368059 | Controlled passive porosity systems to mitigate cavitation A controlled passive porosity system includes a lifting device for operation in a multi-phase liquid, the lifting device having a low pressure surface with a plurality of holes and a high pressure surface with a plurality of holes. A common plenum is disp... | 04/09/2002 |
| 6234751 | Oscillating air jets for reducing HSI noise Porous surfaces on an aerodynamic structure driven with positive and negative pressures are used in an active control system for attenuating shock waves responsible for high-speed impulsive (HSI) noise. The control system includes an array of apertures in... | 05/22/2001 |
| 6092990 | Oscillating air jets for helicopter rotor aerodynamic control and BVI noise reduction An active control system for reducing blade-vortex-interaction (BVI) noise generated by a rotor blade. The active control system includes a pressure sensor assembly, a device for changing a lift generated by the rotor blade, and a controller for activatin... | 07/25/2000 |
| 5938404 | Oscillating air jets on aerodynamic surfaces An active control device for use on an aerodynamic structure is provided. The aerodynamic structure includes an outer aerodynamic skin and an interior volume, wherein the outer aerodynamic skin surrounds the interior volume. The active control device incl... | 08/17/1999 |
| 5813625 | Active blowing system for rotorcraft vortex interaction noise reduction A pressurized porous surface near the leading edge of a rotorcraft blade, is designed to be used as an active control device which alleviates the aerodynamics of blade vortex interactions (BVI) and thus the impulsive BVI noise levels and signature. The pr... | 09/29/1998 |
| 5791875 | Tip vortex reduction system An active control device is disclosed for modifying a tip vortex on a lifting body. The lifting body includes a positive-pressure generating structure and a negative-pressure generating structure, and is adapted for providing lift when a first fluid press... | 08/11/1998 |
| 5562414 | Noise reduction device for rotorcraft A noise deduction for a rotorcraft includes a unit to produce compressed air, a drive shaft provided with a first air supply passage in which the compressed air from the air-producing unit flows, and rotor blades provided with second air supply passages i... | 10/08/1996 |
| 5482482 | Air encircling marine propeller apparatus An air encircled marine thruster cowling includes a cowling that surrounds a propeller and provides an annular blanket of air around the slipstream from the propeller. The cowling includes an inner conical section around the propeller and an outer tubular... | 01/09/1996 |
| 5368441 | Turbine airfoil including diffusing trailing edge pedestals A turbine airfoil having a cut-back trailing edge and a plurality of diffusing flow dividers upstream of the cut-back trailing edge is disclosed. Various construction details are developed which provide ejection of a diffusing film of cooling fluid over a... | 11/29/1994 |
| 5192191 | Propeller vane structure for marine propulsion unit A propeller vane or blade construction wherein cavitation is precluded at the base of the blade where they join the hub on their leading side by introducing a source of pressurized fluid in this area. The fluid may be pressurized either from the dynamic f... | 03/09/1993 |
| 5149014 | Rotary wing aircraft A rotary wing aircraft with rotor blades mounted on a rotor head and with reaction drive. The rotor blades have hollow interiors and are provided on their trailing edge with at least one outlet opening for compressed air supplied via the rotor head. Such ... | 09/22/1992 |
| 4980835 | Control law system for X-Wing aircraft Control law system for the collective axis, as well as pitch and roll axes, of an X-Wing aircraft and for the pneumatic valving controlling circulation control blowing for the rotor. As to the collective axis, the system gives the pilot single-lever direc... | 12/25/1990 |
| 4973275 | Method and arrangement on a vessel Method and arrangement for the reduction of the resistance to rotation of the propeller (3) of a ship (1) going in ice when the ice increases the resistance to rotation of the propeller to a level higher than when sailing in open water. When the resistanc... | 11/27/1990 |
| 4966526 | Mechanically actuated slot for circulation control rotor A circulation control rotor system for aircraft in which compressed air is directly supplied at generally constant pressure to plenums in the rotor blades and discharged through area controlled slots, the area controlling means involving camming surfaces ... | 10/30/1990 |
| 4799859 | Helicopter rotor blade control The present invention relates to a circulation flow control rotor system for an aircraft which includes rotor blades provided with slit shaped blower nozzles further comprising control devices for obtaining a cyclic or multicyclic or collective rotor blad... | 01/24/1989 |
| 4778419 | Reverse thrust propeller A marine propulsion device including a propeller shaft, a lower unit rotatably supporting the propeller shaft and including a lower unit exhaust passageway, and a propeller adapted to be submerged in water and including an inner hub connected to the prope... | 10/18/1988 |
| 4770607 | Rotor blade construction for circulation control aircraft A circulation control aircraft rotor blade of advanced composite material having a spanwise Coanda surface 16 and a plurality of spanwise extending flexible panels 18 cooperating with the Coanda surface to define slots for the discharge of compressed air ... | 09/13/1988 |
| 4702437 | Electric air-driven helicopter A helicopter has a low profile electric motor mounted in each of the rotor blades to drive a cross-flow fan which draws air in through a slot at the leading edge of the blade and forces it out through an opposing slot adjacent the trailing edge of the bla... | 10/27/1987 |
| 4696651 | Apparatus for a ship's propeller An apparatus for a ship's propeller, whose fins, which may be pitch-controlled, are provided in the vicinity of the leading edges with air openings. These air openings are fed via air ducts in each propeller fin by a compressed air source located in the s... | 09/29/1987 |
| 4655685 | Helicopter main rotor blade having a short span slot near the tip end A helicopter main rotor blade having built-in twist for improved hover performance is provided with a trailing-edge, short span slot near the tip end of the blade for upwardly directing a stream of pressurized air therefrom. The upward ejection of air fro... | 04/07/1987 |
| 4643642 | Multi-bladed propeller and shaft assembly A multi-bladed propeller and shaft assembly is provided in which air can be fed to the propeller blades to reduce the effects of cavitation. A shaft leads to a multi-bladed propeller and carries a sleeve formed with inlet passages and axial and radial pas... | 02/17/1987 |
| 4630997 | Apparatus for producing a force when in a moving fluid A device for producing a force when in a moving fluid, such as air or water, and a method for using said device. The device may be placed in a fluid moving in a first direction for producing a force in a second direction, which is substantially transverse... | 12/23/1986 |
| 4626171 | Rotor blade construction for circulation control aircraft A circulation control aircraft rotor blade having a spanwise Coanda surface 16 and a plurality of spanwise extending flexible composite material panels 18 cooperating with the surface to define slots for the discharge of compressed air from within the bla... | 12/02/1986 |
| 4596512 | Circulation controlled rotor blade tip vent valve Inadvertent slot opening in a circulation controlled rotor due to plenum valve leakage is averted by venting duct pressure below a control minimum. A vent valve is disclosed.... | 06/24/1986 |
| 4589611 | Air jet reaction contrarotating rotor gyrodyne A high wing, twin jet gyrodyne having air jet reaction, contrarotating rotors powered with bypass air from twin turbofan engines. Tail pipes from the turbofan engines are disposed parallel to and at opposite sides of a longitudinal duct for discharging by... | 05/20/1986 |
| 4583704 | Pneumatic system structure for circulation control aircraft A plenum for a circulation control rotor aircraft which surrounds the rotor drive shaft (18) and is so constructed that the top (32), outer (38) and bottom (36) walls through compressed air is admitted are fixed to aircraft structure and the inner wall (3... | 04/22/1986 |
| 4573871 | X-Wing aircraft circulation control X-wing aircraft employ a rigid rotor-wing utilizing symmetrical circulation irfoils. The rotor is driven mechanically, and lift is achieved by modulation of air circulation about the base airfoils. This is accomplished by blowing compressed air through tra... | 03/04/1986 |
| 4555079 | Multiple jet blowing around the blunt trailing edge of a circulation controlled airfoil A circulation controlled airfoil has a body structure with leading and trailing ends and upper and lower surfaces extending therebetween, and a cylindrical member disposed along the trailing end of the body structure between the upper and lower surfaces t... | 11/26/1985 |
| 4534702 | Pneumatic control valve actuator computer control arrangement Quad-redundant signal processors in a flight control computer control valves to modulate airflow in a circulation control rotor system. The valves are arranged in a series and each valve is responsive to two signal processors. Loss of a valve occurs when ... | 08/13/1985 |
| 4507050 | Pneumatic valve control for circulation control aircraft A circulation control rotor system in which butterfly valves (44, 46) control the flow of compressed air from a plenum chamber (40) to the rotor blades (14). Each has an actuator (48, 52) positioning the valve in accordance with a control input and in whi... | 03/26/1985 |
