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| Number | Title | Issue Date |
| 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 |
| 6484214 | Method for distributed object communications based on dynamically acquired and assembled software components A method for acquiring and assembling software components at execution time into a client program, where the components may be acquired from remote networked servers is disclosed. The acquired components are assembled according to knowledge represented wi... | 11/19/2002 |
| 6406783 | Bulk absorber and process for manufacturing same A bulk absorber has a continuous concentration gradient of particles with dielectric or magnetic altered properties. The bulk absorber may be made from foam or, ceramic. The particles may be carbon fibers, carbon black, carbon whiskers, coated hollow micr... | 06/18/2002 |
| 6375779 | Method for making structures having low radar reflectivity A lightweight, three dimensional structural article having low radar reflectivity characteristics and good mechanical properties is fabricated from a syntactic foam core having a structural outer skin. A syntactic foam sealing adhesive film is applied to ... | 04/23/2002 |
| 6350513 | Low density structures having radar absorbing characteristics A lightweight, three dimensional structural article having low radar reflectivity characteristics and good mechanical properties is fabricated from a syntactic foam core having a structural outer skin. A syntactic foam sealing adhesive film is applied to ... | 02/26/2002 |
| 6291071 | Bonded composite structure and its fabrication A composite structure is made by first furnishing a skin layer made of a composite material of quartz fibers embedded in an uncured cyanate ester-resin matrix. A transition layer of a first epoxy resin is applied to the skin layer. The skin structure incl... | 09/18/2001 |
| 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 |
| 6217983 | R-foam and method of manufacturing same An R-foam having a surface with an electrically resistive ink layer that is continuous and an electrically conductive ink layer that is in a predetermined pattern. The resulting surface is thereby electrically modified to have a predetermined resistive ta... | 04/17/2001 |
| 6193464 | Active brake control for rotor/wing aircraft The present invention comprises a feedback-controlled braking apparatus that applies a modulated braking force that smoothly decelerates a rotating shaft such that it comes to rest at a precise location. According to a preferred embodiment of the present ... | 02/27/2001 |
| 6170779 | Rotor pitch lock for rotary/wing aircraft The present invention comprises an apparatus for locking the pitch axes of the rotor blades of a rotor/wing aircraft so as to form a rigid wing. In one embodiment of the present invention the rotor blades of a rotor/wing aircraft are locked to each other ... | 01/09/2001 |
| 6161799 | Rotor blade lock for rotary/wing aircraft The present invention comprises an apparatus for locking both rotor blades of a rotor/wing aircraft at a common point to form a rigid wing having a uniform bilateral aerodynamic response. In one embodiment of the present invention the rotor blades of a ro... | 12/19/2000 |
| 6146253 | Apparatus and method for precision grinding face gear A precision grinding apparatus includes a grinding worm for precision grinding a case-hardened face gear. A shaper is first placed into contact with a face gear, to thereby shape a surface of the face gear into a plurality of face gear teeth. The shaper i... | 11/14/2000 |
| 6131849 | Articulating/telescoping duct for reaction drive helicopters An articulating and telescoping duct is provided for use in a helicopter reaction drive flow path for ducting the exhaust and/or bypass gases from the aircraft engine into the flow ducts of the rotor blades. In a preferred embodiment the telescoping duct ... | 10/17/2000 |
| 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 |
| 6056846 | Bonded composite structure and its fabrication A composite structure is made by first furnishing a skin layer made of a composite material of quartz fibers embedded in an uncured cyanate ester-resin matrix. A transition layer of a first epoxy resin is applied to the skin layer. The skin structure incl... | 05/02/2000 |
| 6005513 | Portable flight guidance and tracking system A portable three-dimensional position and velocity data archiving system for use with an aircraft during flight testing and evaluations. The system includes a ground based system and an airborne system. Each system includes a GPS receiver electrically con... | 12/21/1999 |
| 5951608 | Flight control system for jet powered tri-mode aircraft The disclosed flight control system includes a rotor blade speed monitor for monitoring the rotor blade speed of the jet powered tri-mode aircraft and for outputting a rotor blade speed command. The flight control system also includes an aircraft attitude... | 09/14/1999 |
| 5951252 | Helicopter flap lock assembly A flap lock device for restraining the flapping movement of a main rotor blade assembly on a helicopter. The flap lock device includes an first elongate frame member which extends between a first end and a second end and second elongate frame member which... | 09/14/1999 |
| 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 |
| 5934875 | Removable helicopter mast A helicopter's main rotor blades are removably attached to a hub, which is rotatably mounted on a mast. The base of the mast is attached to the helicopter's body by unthreaded, expandable bushing bolts. When inserted, the bolts' centerlines lie in a plane... | 08/10/1999 |
| 5934608 | Efficient bi-directional air flow deflector The bi-directional air flow deflector of the present invention efficiently deflects air to the left opening and the right opening, and minimizes any vertical components of force which may be generated. The air flow vector exiting from each of the openings... | 08/10/1999 |
| 5922987 | Hydraulic traverse and elevation mechanism A locking mechanism for locking an orientation of a weapon is disclosed. The locking mechanism includes a first movable arm adapted to contact and apply pressure onto a control surface associated with the weapon, and a second movable arm adapted to contac... | 07/13/1999 |
| 5915649 | Roadable helicopter A roadable helicopter according to various aspects of the present invention comprises a vehicle that drives like a conventional car in its road configuration, and converts to fly like a helicopter in its flight configuration. The operator of the helicopte... | 06/29/1999 |
| 5897077 | Quick-change skid landing gear A low-profile transportation and storage assembly is readily substitutable with a conventional pair of skid landing gear. The low-profile transportation and storage assembly includes a front auxiliary crosstube having low-profile wheels attached to opposi... | 04/27/1999 |
| 5862706 | Shaft deflection controller A shaft deflection controller includes an input driveshaft adapted for inputting power from an engine. The input driveshaft includes an axis of rotation and a spur pinion at an end of the input driveshaft. The axis of rotation of the input driveshaft chan... | 01/26/1999 |
| 5860810 | Automated instructional system for performing mechanical procedures A mechanical procedure is performed using a sequence of instructions generated from a relational data base. The data base includes at least one unit operation file containing data associated with the performance of a single unit operation, indications of ... | 01/19/1999 |
| 5850615 | Rotor blade swashplate-axis rotation and gyroscopic moments componsator An apparatus for compensating for spatial phase angle phase errors in the flapping angle oscillations of a rotor blade is disclosed. The apparatus receives a measured aircraft roll and a measured aircraft pitch. Gyroscopic moments resulting from these mea... | 12/15/1998 |
| 5844518 | Thermoplastic syntactic foam waffle absorber The microwave absorption performance of a fiber loaded thermoplastic syntactic material is improved by geometrically reshaping the surface into a waffle shape. Starting with a fiber loaded version of thermoplastic syntactic foam, the front face geometry i... | 12/01/1998 |
| 5823470 | Split torque proprotor transmission A conversion access gearset includes a first bevel gear, which is connected to a wing cross shaft leading from the proprotor drive train path to the second turbine engine. A second bevel gear is connected to a main transmission input shaft, which is adapt... | 10/20/1998 |
| 5820071 | Mechanical coupler/decoupler A coupler/decoupler is suitable for connecting one mechanical system to another and, upon application of sufficient force, resettably disengaging the first mechanical system from the second. In particular, the coupler/decoupler couples the pilot's or co-p... | 10/13/1998 |
| 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 |
| 5802918 | Concentric face gear transmission assembly A concentric face gear assembly includes a first face gear having first face gear teeth and second face gear having second face gear teeth. At least one input pinion contacts both the first face gear teeth and the second face gear teeth, and at least one ... | 09/08/1998 |
| 5799901 | Rotor blade swashplate-axis rotation and gyroscopic moments compensator An apparatus for compensating for spatial phase angle phase errors in the flapping angle oscillations of a rotor blade is disclosed. The apparatus receives a measured aircraft roll and a measured aircraft pitch. Gyroscopic moments resulting from these mea... | 09/01/1998 |
| 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 |
| 5788181 | Thermostatic metal actuator for nozzle actuation A nozzle for use on opposing ends of the rotor of a jet powered tri-mode aircraft is disclosed. The nozzle includes two thermally-controlled doors, which are moveable between an open configuration where hot jet engine exhaust is vented therethrough to pro... | 08/04/1998 |
| 5731056 | Rigid structure attachment using hook and loop fasteners A securing system includes a primary structure and a first strip of hook and loop fasteners adapted to be secured thereon. A secondary structure includes a plurality of apertures disposed therein. The plurality of apertures fit over the first strip of hoo... | 03/24/1998 |
| 5727757 | Slotted cam control system The present invention provides a slotted cam control system for controlling pitch angles of fan blades of a relatively low-pressure-ratio fan within a fuselage of a helicopter. The stream of air generated by the fan is directed into the tailboom of the he... | 03/17/1998 |
| 5726375 | Gun barrel shrouding system A gun barrel shrouding system is capable of significantly reducing the infrared signature of a gun barrel, without directly cooling the gun barrel. A shroud is placed around the gun barrel, but the shroud does not contact the gun barrel. Air is circulated... | 03/10/1998 |
| 5711651 | Blade vortex interaction noise reduction techniques for a rotorcraft An active control device for reducing blade-vortex interactions (BVI) noise generated by a rotorcraft, such as a helicopter, comprises a trailing edge flap located near the tip of each of the rotorcraft's rotor blades. The flap may be actuated in any conv... | 01/27/1998 |
