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Match Document Document Title
7635252 Shock absorbing device for watercraft propeller  
A shock absorbing device for a watercraft propeller is provided that can include an outer tube unitarily formed with blades of a propeller. An inner tube can be coupled with a propeller shaft. An...
7385306 wind power generator including blade arrangement  
The invention relates to a wind power current generator comprising a bearing, a tubular stator that carries a race of the bearing, a tubular rotor coaxial with the tubular stator that can rotate in...
7351033 Wind turbine load control method  
A method for limiting loads in a wind turbine by using measured loads or wind speed to increase the minimum pitch angle for extended periods. The minimum pitch angle will be allowed to relax down...
7223071 Device for providing assistance to the pilot of a rotorcraft in the event of engine failure  
The present invention provides a device enabling the collective pitch of the blades of the main rotor of a single-engined rotorcraft to be reduced automatically in the event of an engine failure....
7172392 Passive speed and power regulation of a wind turbine  
A wind turbine with at least one blade having a pitch axis that is offset laterally so that the blade does not intersect with an axis of rotation of the wind turbine, and a center of mass and an...
7121505 Method of control for toy aircraft  
The invention described here offers a low-cost method of remote flight control suitable for use in toy airplanes and ornithopters (flapping-wing aircraft). To accomplish this, the aircraft is...
7118338 Methods and apparatus for twist bend coupled (TCB) wind turbine blades  
A method for controlling a wind turbine having twist bend coupled rotor blades on a rotor mechanically coupled to a generator includes determining a speed of a rotor blade tip of the wind turbine,...
7101152 Method for maximizing the energy output of a wind turbine  
A method is provided for controlling a wind turbine, and a wind turbine is provided with a control device for controlling a wind turbine. A method and a wind turbine are developed so that losses of...
7004724 Method and apparatus for wind turbine rotor load control based on shaft radial displacement  
Vertical and horizontal wind shears, yaw misalignment and/or turbulence act together to produce asymmetric loading across a wind turbine rotor. The resultant load produces bending moments in the...
6966754 System and method for monitoring a wind turbine  
In one aspect, the present invention relates to a system for monitoring wind turbines, wherein image and acoustic monitoring, in particular, is performed. In order to further improve, for example,...
6634224 Method for the determination of the pressure in and/or of the through-flow through a pump  
In the method for the determination of the pressure (p) in and/or of the through-flow (Q) of a liquid through a pump having at least one magnetic bearing for the axial journaling of the pump rotor...
6468035 Method and apparatus for controlling airplane engine  
An airplane engine control method and apparatus are provided which form an engine control system easy to operate, which set a reciprocating engine of an airplane in such an operating condition in a...
6158960 Propeller hub with self-adjusting pitch mechanism  
A mechanism for automatically changing the pitch of propeller blades employing engine torque alone which increases with air speed. A powered hub mounts at least two blades and includes blade pitch...
6059528 Electronic propeller control system  
An improved electronic hydraulic propeller control designed as a retro-fit kit for existing Hamilton Standard Division 54460 and 54H60 propeller controllers includes an apparatus for controlling...
6007298 Optimum speed rotor  
A variable speed helicopter rotor system and method for operating such a system are provided which allow the helicopter rotor to be operated at an optimal angular velocity in revolutions per minute...
5810561 Variable pitch propeller apparatus  
A variable pitch propeller apparatus for use with a motor is disclosed. The apparatus includes a housing having a plurality of blades mounted therein for rotation. Adjustable high pitch and low...
5494406 Propeller for boat  
A propeller for a boat having a plurality of recesses and a plurality of land portions arranged circumferentially alternately around an outer periphery of a propeller boss which is fitted over and...
5465211 Control system for propeller driven aircraft  
A control system is provided which prevents a powerful, propeller driven, jet training aircraft from requiring corrective action to throttling and gyroscopic effects when the student wishes to fly...
5413461 Method and apparatus for controlling a propulsion engine output based on the net axial force on a propeller shaft  
A method and apparatus for controlling a propulsion engine output in a vessel, based on the net axial force on a propeller shaft in the vessel. The apparatus includes a regulating loop with a...
5326223 Automatic variable pitch marine propeller with mechanical holding means  
There is provided a self-actuating variable pitch marine propeller which incorporates two or more blades, each independently rotatable, relative to the propeller hub, between a first lower and a...
5240374 Damped automatic variable pitch marine propeller  
There is provided a self-actuating variable pitch marine propeller which incorporates two or more blades, each independently rotatable, relative to the propeller hub, between a first lower and a...
5019006 Aircraft engine propeller overspeed protection technical field  
An aircraft engine propeller autofeather system (4) has a feather solenoid (8) which is actuated by either a signal provided by an engine power loss detector (10) or a signal provided by an engine...
4929153 Self-actuating variable pitch marine propeller  
There is provided a self-actuating, variable pitch propeller having a plurality of blades. All of the blades are automatically movable between a first, relatively lower pitch position and a second,...
4759514 Tail rotor yaw position control for a helicopter  
A yaw rate stabilizer for the tail rotor of a helicopter includes a tail rotor shaft rotatably supporting a tail rotor on which rotor blades are radially mounted to develop a lift force directed...
4693671 Reversible self-adjusting propeller device  
A self-adjusting propeller device having a control blade and a thrust blade connected together in nondiametrical relation and pivotally mounted on a hub for rotation about a hub axis. In response...
4690614 Torque meter  
A torque meter is provided for use in conjunction with a layshaft having a forward and rear end and which is rotatably mounted in a housing. The layshaft is axially movable with respect to the...
4673822 Wind electric generator  
Wind mill blades are mounted on spokes provided on a power shaft via springs, and thereby in an ordinary wind velocity the wind mill blades are adjusted into a prescribed angle, while in a storm...
4656362 Blade pitch angle control for large wind turbines  
A blade pitch angle control system for a wind turbine includes an improved control means (95) for providing a minimum pitch angle reference signal indicative of desired blade pitch at wind...
4648797 Torque control system  
The dynamic instabilities in a system which controls prime mover output torque and angular velocity separately are avoided by deriving an accelerating torque signal in an output torque controller...
4641039 Wind motors and aerogenerators  
An aerogenerator or wind motor comprises a variable pitch propeller rotor. It comprises compensation means (13) which are sensitive to the deceleration of the rotor to automatically exert on each...
4609165 Helicopter auxiliary energy system  
Autorotation in helicopters at low altitudes can be achieved even when the inherent design of the helicopter would prohibit successful entry into the autorotation mode. Angular kinetic energy from...
4575309 Wind turbines  
A wind turbine having the tips of the blades pivotable to a position in which they act as brakes to slow the turbine down. The pivoting is caused by relative axial movement of the tip and main...
4495423 Wind energy conversion system  
A wind powered device on a support structure is provided with a drive shaft mounted for rotation about its axis on the support structure and is coupled to an electric generator connected to a...
4493465 Helicopter engine torque compensator  
The blade angle controlling pitch beam servo (26) of a helicopter tail rotor (22) is responsive to a signal manifestation (76) indicative of free turbine engine (20) gas generator speed (78) to...
4465431 Overload protection apparatus for variable pitch propellers  
Disclosed is an overload protection apparatus for variable pitch propellers, particularly cycloidal propellers. The apparatus is of the kind having a hydraulic servomotor (2) with an adjustment rod...
4435647 Predicted motion wind turbine tower damping  
Damping of the primary bending mode of a tower (12) mounting a wind turbine having a control (36) for providing a pitch blade angle reference signal (40) to modulate the pitch of the turbine blades...
4420692 Motion responsive wind turbine tower damping  
An accelerometer (1) disposed on the support tower (12) of a wind turbine electric generating system in the vicinity of the rotor (10, 16) thereof provides a signal (1) indicative of acceleration...
4408954 Windmill yaw and speed controls  
A yaw control device automatically aligns a windmill. A spur gear displaces a motor-driven worm gear mounted between balanced springs when an external turning moment is applied to the windmill....
4364711 Folding boat propeller  
A boat propeller with foldable blades, a so-called folding propeller, in which the mounting axes of the blades in the hub are inclined towards the rotational axis of the hub, so that the blades are...
4349315 Adjustable vane windmills  
A system of rotatably and pivotally mounted radially extended bent supports for radially extending windmill rotor vanes in combination with axially movable radially extended control struts...
4339666 Blade pitch angle control for a wind turbine generator  
A blade pitch angle control for a wind turbine-generator establishing an optimum power or torque reference signal which, when operating conditions so warrant, is not limited by the nominal torque...
4298313 Horizontal axis wind generator having adaptive cyclic pitch control  
Cyclic pitch variation of the rotor blades of a horizontal axis wind energy conversion machine permit its operation at substantially design rotor speed and rotor torque over a range of wind speeds,...
4286923 Overload protection device for a propeller drive engine  
An overload protection device for the drive engine of a propeller, wherein the pitch of the propeller blades may be adjusted: A servomotor with a piston therein and the servomotor being controlled...
4280061 Method and apparatus for generating electricity from a fixed pitch wind wheel  
A method and apparatus for generating electricity from wind energy, wherein a wind wheel is connected to drive an energy converter which effects a torque reaction on the wind wheel proportional to...
4272041 Model helicopter device  
A model helicopter device wherein a countertorque generated in the helicopter body by changes in the revolution of a main rotor is canceled by substantially detecting the acceleration of the...
4260329 Propeller pitch and engine load control apparatus  
Apparatus including series-connected pitch inching pilot valve, load control pilot valve, pressure feedback valve assembly, pitch direction selector valve, and servo power cylinder assembly. A load...
4239454 Overload protection control circuit for marine engines  
An overload protection control circuit for marine engines, in which a propeller pitch control signal, as initiated by the operator and transmitted to a servo-positioner for setting the propeller...
4219308 Torque control system for wind energy conversion devices  
Automatic torque control of wind energy conversion devices is provided through the utilization of turbine reaction torque. In the preferred embodiment, the frame of the driven machine is arranged...
4193005 Multi-mode control system for wind turbines  
A multi-mode electronic wind turbine control system establishes a reference blade angle for a two-bladed, horizontal axis, variable pitch wind turbine rotor, the blade angle being regulated by a...
4161371 Self-regulating turbine  
1. A self-regulating turbine comprising an inner turbine rotor having outdly extending vanes with air passages between them, an outer rotor member concentric with and extending radially beyond said...
Matches 1 - 50 out of 94 1 2 >