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| Number | Title | Issue Date |
| 7658595 | Protective boot for a helicopter pitch link A protective boot for a helicopter blade pitch link assembly as described herein includes a split joint that allows for easy removal and replacement of the protective boot. The protective boot is less expensive to replace, requires less manpower, and eliminates the ... | 02/09/2010 |
| 7524169 | Helicopter pitch link with accessible adjustment features A helicopter pitch link assembly as described herein includes a length adjustment mechanism, such as a turnbuckle, that is accessible when the pitch link assembly is installed on a helicopter that utilizes a weather cover or canopy and a protective boot. The adjustm... | 04/28/2009 |
| 7269938 | Counter-rotating gas turbine engine and method of assembling same A method for assembling a gas turbine engine includes providing a high pressure turbine, 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 ou... | 09/18/2007 |
| 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 |
| 7008184 | Control for cooling fan A control for changing direction of air flow through a cooling core in response to an external signal and a purge signal includes a logic circuit and a relay assembly. The logic circuit generates a fan control signal based on the external signal, which causes the fa... | 03/07/2006 |
| 6981844 | Cyclic actuation system for a controllable pitch propeller and a method of providing aircraft control therewith A propeller control generates a once per revolution (1P) blade thrust variation through cyclic pitch of rigidly mounted non-flapping propeller blades. The resultant shaft bending moment is used to provide aircraft attitude control. Axial translation of a pitch chang... | 01/03/2006 |
| 6953313 | Self-locking linear adjustment mechanism A self-locking linear adjustment mechanism may be configured in the form of a rod assembly or a cartridge assembly. The self-locking linear adjustment mechanism in the form of a cartridge assembly includes a self-locking linear adjustment mechanism including a locki... | 10/11/2005 |
| 6666649 | Helicopter individual blade control system In an individual rotor blade control device for a helicopter main rotor with a rotor shaft that can be driven by a main drive, with an even number of rotor blades that are arranged on the periphery of a rotor hub, with primary control mechanisms for colle... | 12/23/2003 |
| 6514044 | Offset crowned roller assembly for variable pitch propellers The expense of a bearing employed at the interface of a yoke (22) and a propeller blade pin (14) in a variable pitch propeller assembly is reduced in a bearing construction (16) wherein a bearing race (48) includes a crowned surface (50) adapted to engage... | 02/04/2003 |
| 6155784 | Variable pitch aircraft propeller A propeller for aircraft has a tip-to-tip flex-beam spar and torsionally stiff hollow blades bonded to the spar throughout an outer portion of the blades. The spar has two end caps which are separated from each other at the hub and converge in the outer p... | 12/05/2000 |
| 6142735 | Variable-pitch propeller, especially for sport craft A variable-pitch propeller, especially for a sport board, has angularly displaceable blade support plates which can be rotated about respective radial axes. The plates are provided with radially inwardly directed claws which engage in circumferential groo... | 11/07/2000 |
| 6126398 | Two-piece rotor blade for a bearingless rotor of a helicopter A rotor blade for a bearingless rotor of a helicopter includes a lift-generating airfoil blade, a flexbeam connecting the airfoil blade to a rotor head, and a control sleeve enclosing the flexbeam. The junction between the flexbeam and the airfoil blade i... | 10/03/2000 |
| 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 |
| 6071076 | Actuation system for a gas turbine rotor blade An actuation system which includes apparatus for transferring control signals for varying the blade pitch from a non-rotating member to a rotating member of a gas turbine engine is described. In one embodiment, the engine includes a main disk containing a... | 06/06/2000 |
| 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 |
| 6042337 | Sealing system for a hydraulic machine A Kaplan turbine or similar hydraulic machine has a hub body (1) fixed to the turbine shaft with radial blades attached to the hub body. The blades are fitted with oil lubricated bearings in the hub body. A sealing arrangement for the oil system has first... | 03/28/2000 |
| 5967750 | Variable pitch marine propeller A variable-pitch marine propeller system has a propeller unit for mounting on a drive shaft, and a power unit including a stationary annular hydraulic cylinder for operating the propeller unit, a hydraulic remote control unit being fluid-coupled to the po... | 10/19/1999 |
| 5826822 | System and method for providing cyclic and collective pitch control in a rotary wing aircraft A cyclic and collective control system is provided for controlling rotor pitch in a rotary wing aircraft. The rotor blades are pivotally mounted on a hollow, spinning shaft. An angularly and vertically displaceable control shaft is mounted with the spinni... | 10/27/1998 |
| 5788462 | Hingeless rotor with intermediate pitch-control rings A hingeless rotor including a rotor mast driven in rotation about an axis of the rotor, a hub secured in terms of rotation to the mast, and at least two blades, each of which is, firstly, joined to the hub by a root attachment part comprising at least one... | 08/04/1998 |
| 5785497 | Control rod mounting arrangement for helicopter swashplates A mounting arrangement (60) for coupling a control rod (38) to a stationary swashplate member (32) of a helicopter swashplate assembly (30) wherein the mounting arrangement (60) is characterized by a specially configured stationary swashplate member (32) ... | 07/28/1998 |
| 5727926 | Pitch link for rotary wing aircraft and automatic adjuster thereof A pitch link having an adjustable length is constructed as a diamond-shaped frame by coupling and fixing four flexible beams at end portions thereof. Spherical bearings are provided on opposite ends of the structure. A turnbuckle shaft is screwed into ver... | 03/17/1998 |
| 5624232 | Device for controlling the pitch of the blades of a rotorcraft rotor The device comprises, in addition to the conventional non-rotating plate and rotating plate of a swashplates device, a secondary rotating plate which can move in translation with the non-rotating plate but which cannot be inclined, and, for each blade, an... | 04/29/1997 |
| 5599167 | Device for controlling the pitch of the blades of a rotorcraft rotor The device for controlling the pitch of the blades of a rotor using a mechanism having swashplates includes an auxiliary plate mounted on the non-rotating plate of the mechanism and which is secured in terms of rotation to the rotating plate of this mecha... | 02/04/1997 |
| 5542818 | Ducted Anti-torque rotor with floating blades In the rotor, the pitch lever of each blade is connected to the tab of the pitch control spider by a ball joint mounted on a wrist pin and received with clearance in an oblong opening in a ring. The axially offset bearing surfaces of the cuff of the blade... | 08/06/1996 |
| 5511944 | Pitch link for rotary wing aircraft and automatic adjuster thereof A pitch link having an adjustable length is constructed as a diamond-shaped frame by coupling and fixing four flexible beams same in length and rigidity each at end portions thereof. Spherical bearings are provided on opposite ends with the longer diagona... | 04/30/1996 |
| 5478204 | Ducted fan and pitch controls for tail rotor of rotary wing aircraft A tail rotor for a rotary wing aircraft is located in a laterally directed duct located at the end of a tail cone extending rearward from the aircraft cabin and at the base of an empennage extending upward from the duct. The rotor includes a rotor shaft d... | 12/26/1995 |
| 5462408 | Blade made of thermoplastic composite, in particular for ducted tail rotor of a helicopter, and its method of manufacture The blade has its lower-surface and upper-surface skins of its shell, its front and rear filling bodies and its spar made of a composite material having the same thermoplastic matrix, preferably made of PEEK, reinforced preferably with carbon fibres. The ... | 10/31/1995 |
| 5454693 | Blade made of thermoplastic composite, in particular for ducted tail rotor of a helicopter, and its method of manufacture with injection step The blade has its lower-surface and upper-surface skins of its shell, its front and rear filling bodies and its spar made of a composite material having the same thermoplastic matrix, preferably made of PEEK, reinforced preferably with carbon fibres. The ... | 10/03/1995 |
| 5431539 | Propeller pitch change mechanism The pitch change mechanism for a variable pitch propeller blade or Advanced Ducted Propulsor (ADP) interconnecting the pitch change actuator and the propeller blades of the type that includes a trunnion attached to the root of the propeller blade, the con... | 07/11/1995 |
| 5431540 | Main rotor pitch control rod subassembly One embodiment of a main rotor pitch control rod subassembly includes an upper rod end segment having a bearing subassembly, a lower rod end segment having a bearing subassembly, an eccentric bushing disposed in rotatable combination with the upper rod en... | 07/11/1995 |
| 5415525 | Ducted tail rotor providing torque reaction and yaw attitude control A tail rotor for a rotary wing aircraft is located in a laterally directed duct located at the end of a tail cone extending rearward from the aircraft cabin and at the base of an empennage extending upward from the duct. The rotor includes a rotor shaft d... | 05/16/1995 |
| 5368442 | Automatic variable discrete pitch marine propeller A self-actuating variable pitch marine propeller which incorporates two or more blades which are rotatably connected to a central hub; the blades rotate relative to the hub center about the shank axis. In operation, the blades are biassed towards the lowe... | 11/29/1994 |
| 5306119 | Ducted tail rotor for rotor craft A ducted fan-type tail rotor of a rotor craft in which the tail rotor is surrounded by a tubular duct is provided which includes at least six rotor blades, and pitch horns, each mounted to the respective rotor blades. Each pitch horn is swingable to chang... | 04/26/1994 |
| 5304036 | Autogyro aircraft An autogyro aircraft has freewheeling rotor blades that provide lift. A separate pusher propeller provides forward thrust. The rotor system (20) has a collective arm (30) as a control for selectively setting and maintaining a tension force on a collective... | 04/19/1994 |
| 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 |
| 5249925 | Variable-pitch multi-blade rotor, in particular for the rear anti-torque system of a rotating wing aircraft A variable-pitch multi-blade rotor for use as the anti-torque rear rotor of a rotating wing aircraft has a rotor with a central shaft rotated about a central axis, a hub constrained to rotate with the central shaft about the central axis, blades distribut... | 10/05/1993 |
| 5165854 | Mechanism for controlling pitch change in helicopter blades Mechanism for controlling pitch changes in helicopter blades, related to the helicopter mast and connected to a lever assembly mounted into the structure, having a pair of command arms, the assembly comprising first and second bars, related by rocker arms... | 11/24/1992 |
| 5163815 | Rotor blade control mechanism A rotor blade control mechanism includes a transmission driving a hollow rotating drive shaft, extending through the transmission. A rotor head is attached to a top end of the drive shaft and includes rotor blade shafts of variable pitch and having contro... | 11/17/1992 |
| 5104291 | Variable pitch propeller blade hub and drive and adjusting mechanism therefor A hollow hub has around its exterior a plurality of apertures for individually receiving a respective cylindrical inner end portion of one of a plurality of axially rotatable propeller blades. Additionally, the hub has around its exterior a plurality of a... | 04/14/1992 |
| 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 |
