Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 7997863 | Wind turbine Described herein is an improved wind turbine with a dynamic blade configuration. ... | 08/16/2011 |
| 7360996 | Wind blade assembly and method for damping load or strain The transducers are incorporated in or laminated to wind blades and electrically connected to a self-powered electrical circuit. The transducers in combination with the self-powered electrical circuit improve the wind blades' response to changing wind conditions by ... | 04/22/2008 |
| 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 to the default when load excursions diminish. The method will allow tu... | 04/01/2008 |
| 7322794 | Method and apparatus for condition-based monitoring of wind turbine components Condition-based monitoring functionality using sensors that monitor wind turbine component movement. A main shaft flange displacement sensor system can be used to provide signals used to perform fatigue assessment of the wind turbine rotor blades as well as drive tr... | 01/29/2008 |
| 7210651 | Compact co-axial rotor system for a rotary wing aircraft and a control system therefor A dual, counter rotating, coaxial rotor system provides an upper and lower rotor system, with a reduced axial rotor separation distance along a common axis by way of rotor tip position sensing and rotor position controls to avoid tip contact. ... | 05/01/2007 |
| 7083142 | Compact co-axial rotor system for a rotary wing aircraft and a control system thereof A dual, counter rotating, coaxial rotor system provides an upper and lower rotor system, with a reduced axial rotor separation distance along a common axis by way of rotor tip position sensing and rotor position controls to avoid tip contact. ... | 08/01/2006 |
| 7025567 | Early-warning system for wind power installations The claimed and disclosed systems and methods are directed to providing measures and possible ways of protecting a wind power installation in a wind park from wind conditions that may potentially cause damage or even result in the failure of at least one of the wind... | 04/11/2006 |
| 7011503 | Fan blade for allowing airflow with fan in failure condition A fan and a fan blade are provided for allowing airflow through the fan blade in a fan failure condition. The fan blade includes a peripheral member defining an opening. A flexible cover member is attached to the peripheral member for covering the fan blade opening ... | 03/14/2006 |
| 6691950 | Device and system for the automatic control of a helicopter Device and system for the automatic control of a helicopter. The automatic control device (6) comprises a vertical objective law (A) in respect of the pitching axis, which automatically determines a control command (UT1) for operating the tilting of the disk o... | 02/17/2004 |
| 6379115 | Windmill and windmill control method A windmill includes a freely rotatable revolution shaft, a plurality of pairs of pivotal support rods provided at the revolution shaft, and wind receiving blades respectively and rotatably set between the pivotal support rods with wind receiving blade sha... | 04/30/2002 |
| 6340289 | Single lever power controller for manned and unmanned aircraft Method and apparatus for controlling an aircraft engine with a single, manually-operable lever includes structure and function for generating a pilot thrust command from the single lever. A processor is coupled to the single lever and (i) receives the gen... | 01/22/2002 |
| 6171055 | Single lever power controller for manned and unmanned aircraft Method and apparatus for controlling an aircraft engine with a single, manually-operable lever includes structure and function for generating a pilot thrust command from the single lever. A processor is coupled to the single lever and (i) receives the gen... | 01/09/2001 |
| 5997250 | Method and apparatus for controlling pitch of an aircraft propeller A propeller pitch control apparatus for an aircraft in which the vector sum of the aircraft forward speed and the propeller rotational tip speed is a selected fraction of the speed of sound, the fraction based on percent power and altitude, to maximize ef... | 12/07/1999 |
| 5765672 | Overheating protection device for rotational control apparatus A device (10) is disclosed for intercepting the input of a system (23) of an internal combustion engine (12) normally provided to a solenoid valve (22) for actuating a fan clutch (20) when rotation of a fan (16) is desired. The input is received by termin... | 06/16/1998 |
| 5362205 | Method and apparatus for synchronizing the speed and phase of plural propellers of an aircraft A propeller control system (1) includes a propeller controller (6) the gain of which is set by a look up table (2) in response to airspeed data supplied by an airspeed detector (4). By varying the gain of the propeller controller (6) an overall system gai... | 11/08/1994 |
| 4123018 | Helicopters with coaxial rotors, of convertible type in particular The invention relates to improvements to helicopters with coaxial rotors, of convertible type in particular, consisting of at least two contra rotative rotors carrying blades for lifting and propelling, the fuselage having an axis parallel to the axes of ... | 10/31/1978 |
| 4027999 | Analog mixer to vary helicopter rotor phase angle in flight An analog mixer for a helicopter rotor control system mounted for tilting motion about a variable tilt axis and connected to the rotor control swashplate to cause synchronous tilting and including means to impart tilt generating control inputs to the anal... | 06/07/1977 |
| 4008979 | Control for helicopter having dual rigid rotors A control for a helicopter having dual, coaxial, counterrotating rigid rotors which varies the cyclic control phase angle of each rotor in flight as a function of vehicle forward speed to thereby control the coupling of lateral cyclic pitch with longitudi... | 02/22/1977 |
| 4005835 | Automatic flight control means for rotary wing aircraft having attitude-air speed control An automatic flight control apparatus for a rotary wing aircraft for controlling the flight condition by utilizing a signal representing the air speed of the aircraft which is added to a bias signal corresponding to the attitude of the aircraft in hoverin... | 02/01/1977 |
