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5106265 |
Wind-turbine wing with a pneumatically actuated spoiler
A flexible spoiler is arranged on the suction side of a wing and spoiler is made of a narrow flexible fold tape covering a tunnel which is sealed against the outer airstream and extends inside the...
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5096378 |
Control of a wind turbine
A wind turbine generator blade includes a movable front portion, extending from the faster-moving blade tip in a span-wise direction along the blade, and mounted on a pivot axis permitting the...
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4892460 |
Propeller breeze enhancing blades for conventional ceiling fans
Aerodynamically designed and improved auxiliary blade attachment that wedge firmly onto the trailing edges of the main blades of conventional ceiling fans. The highly functional shape and super...
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4877374 |
Self-regulating windmill
A windmill is provided which automatically compensates for increased wind velocity, causing the blades to feather and rotate at a substantially constant velocity rather than overspeeding. This is...
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4867642 |
Wind mill wing with air brake
By mounting an axle (18,19) in a wind mill wing (1) having a wing tip (22) capable of swinging out by means of a mounting (2,7,8) which may be bolted to the wing and which can furthermore squeeze...
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4715782 |
Hydraulic control device for wind turbine
A hydraulic speed control device for limiting the speed of a wind turbine rotor by controlling the deployment of rotor braking devices includes four fluidicly interconnected elements: one or more...
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4692095 |
Wind turbine blades
Wind turbine blades for use e.g. in generating electricity are described in which the blades have fixed lift spoilers in the form of deep spars projecting on the normally high pressure side of the...
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4662823 |
Air turbulence blades for ceiling fans
Supplemental blade attachments which are mounted to the end portions of the primary blades of conventional ceiling fans and which are of a configuration to establish a greater dispersion of air...
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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...
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4619585 |
Wind turbine apparatus
Wind turbine apparatus includes a plurality of air foil sail elements secured to a circular frame rotatable in response to wind reacting with the sail elements. The sail elements include deformable...
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4618313 |
Axial propeller with increased effective displacement of air whose blades are not twisted
According to the invention an increase of the effective displacement of air in an axial propeller, whose blades are not twisted, is achieved by applications of tab, substantially rigid, at the...
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4571156 |
Air foil with trailing spoiler
An air foil which is coupled to a wind energy conversion machine is provided with a flexible and resilent trailing spoiler that limits the rotational speed of the machine and prevents overspeeding....
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4565929 |
Wind powered system for generating electricity
A fixed pitch wind turbine rotor (18) is teeter mounted (76, 78, 80) onto a low speed input shaft (44) which is connected to the input (58) of a step-up transmission (46). The output (48) of the...
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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...
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4518170 |
Vehicular steering apparatus employing an eccentric actuator
An actuator (10) for effecting relative pivotal movement between two structures (12, 14) includes a bent beam member (18) having a first portion (20) rotatably secured to one structure and a second...
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4514143 |
Aircraft rotor blade with passive tuned tab
A structure (10) for reducing vibratory airloading in a rotor blade (12) with a leading edge (14) and a trailing edge (16) includes a cut-out portion (18) at the trailing edge. A substantially...
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4500257 |
Wind turbine spoiler
An aerodynamic spoiler system for a vertical axis wind turbine includes spoilers on the blades initially stored near the rotor axis to minimize drag. A solenoid latch adjacent the central support...
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4452410 |
In-line gyro type aircraft
An aircraft containing aerodynamic and gyroscopic stability that has a high angle of take-off and landing capabilities, with high speed horizontal powered flight, but is also able to sustain...
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4374631 |
Windmill speed limiting system utilizing hysteresis
A windmill speed limiting device is provided to prevent the windmill blades from going too fast during conditions of heavy winds. In order to slow down the windmill blades, the tips of the blades...
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4355955 |
Wind turbine rotor speed control system
A wind turbine rotor speed control for ensuring a constant rotational speed within tight tolerances includes a self-sufficient rotor (16) incorporating aerodynamic and mechanical devices to provide...
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4335996 |
Windmill construction
Opposing windmill airfoil blades extend from a central hub and are connected thereto by a pair of cables secured to the inner ends of the blades and which each freely engages through the opposite...
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4235397 |
Flow deflector blades
A flow deflector blade primarily for mounting within the efflux of an aircraft propulsion fan so that a change of flow direction can be effected, includes a leading edge member, a trailing edge...
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4180372 |
Wind rotor automatic air brake
A spring-loaded pivoting end plate that is hinged such that it is deployed by centrifugal force into the airstream to thereby act as an aerodynamic brake for wind turbines in overspeed conditions....
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4178127 |
Variable pitch impeller
A system is provided to adjust the operating angle of attack of a variable pitch impeller blade in response to different conditions. The impeller blade is pivotally mounted around a pivot axis and...
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4142822 |
Panemone windmill
A windmill with a vertical-axis rotor having thrust vanes which is surrounded by a stationary cage having guide vanes to channel the windstream to the rotor. In the preferred embodiment the rotor...
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4111601 |
Adjustable windmill
There is disclosed in the present application a windmill including a wheel having a set of fixed blades and a set of movable vanes whose angular orientation with respect to the axis of the wheel is...
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4105363 |
Overspeed control arrangement for vertical axis wind turbines
This invention is an overspeed control arrangement for vertical axis wind turbines employing normally vertically positioned rotor blades, said control arrangement allows the rotor blades to tilt...
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4082479 |
Overspeed spoilers for vertical axis wind turbine
An overspeed spoiler for vertical axis wind turbines of the type having straight or curved airfoil blades attached to a vertical shaft formed by a relatively thin flat blade shaped spoiler element...
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4050246 |
Wind driven power system
A wind driven power plant has a vertical axis rotor which is rigidly connected to a center body in turn connected to a rotating base. The base is supported on a fixed pylon by means of a...
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4047835 |
High efficiency propeller
Conventional propeller blades, for use on water or aircraft, provided with a series of foldable fins on the rear surface of each propeller blade, a number of rows of fins being affixed along the...
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4038821 |
Fluid current motor
A fluid current motor adapted to extract energy from flowing natural currents is disclosed wherein a wheel-like frame is rotatably mounted about a vertical axis. The frame is positioned over a...
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4017041 |
Airfoil tip vortex control
Device for diminishing tip vortices in an aircraft. For the purpose of diminishing the tip vortices generated by aircraft there are provided retractable foils at or near the airfoil, as wing, tips...
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4000868 |
Deflector blade of variable camber
A deflector blade suitable for directing jet exhaust of an aircraft rearward or downward has leading and trailing edge portions and an intermediate portion interposed between the edge portions. The...
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3986794 |
Reversible ducted fan assembly
A gas turbine engine of a ducted-fan bypass type includes a fan with a plurality of circumferentially spaced airfoils thereon each including first and second portions thereof defining a forward...
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3954230 |
Flow elements for influencing flowing media
A flow element for influencing flowing media including a bending-elastic exterior covering, a variable skeleton carrier in the covering, and a support between the exterior covering and the skeleton...
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3952601 |
Helicopter rotor blade balancing method
A helicopter rotor blade having at least one ramp tab of selected span and chord dimensions, weight and shaped to define an outer surface of selected angularity with respect to the blade chord and...
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3944170 |
Apparatus for producing pivotal movement
An apparatus for causing relative movement of first and second structures about a pivot axis is disclosed wherein a rotatable, elongated member has first and second portions which respectively...
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3930626 |
Airplane wing camber control
The angular configuration of a fluid control surface, with respect to the relative direction of fluid flow, is controlled by selectively heating the structural portions of only one side of the...
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3915106 |
Hydrofoil with lift control by airfreed for watercraft
A hydrofoil for watercraft provided with air exit apertures at the under pressure regions of the hydrofoil and extending at least partially over the foil span. Ducts are provided internally of the...
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3902821 |
Helicopter rotor
A helicopter rotor having a plurality of fully articulated rotor blades with each blade having a fully cambered airfoil surface, a relatively stiff inboard portion, and a relatively flexible...
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3893639 |
Airplane wing camber control
The angular configuration of a fluid control surface, with respect to the relative direction of fluid flow, is controlled by selectively heating the structural portions of only one side of the...
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3877836 |
HORIZONTAL WINDMILL
Multiple radial beams extend horizontally for rotation about a vertical axis, and support at their outboard ends vertical, aerodynamic sails which pivot about vertical axes. Cams and cam followers...
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3812812 |
TROLLING PROPELLER WITH SELF ADJUSTING HYDRODYNAMIC SPOILERS
A marine propeller carrying a plurality of hydrodynamic spoilers formed of elastomeric material which self-deploy at low engine speeds to present maximum effective fluid contacting areas impeding...
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3645481 |
AIRFOIL STRUCTURE
An airfoil structure is disclosed, using a unitary laminated load-bearing skin member, and a rigid internal bracing structure. The skin member includes an outer layer of sheet plastic polymeric...
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3614260 |
BLADES OR VANES FOR FLUID FLOW MACHINES
A variable geometry blade or vane particularly for use in a gas turbine engine comprises a rigid spine, a thin flexible sheet shaped to form the aerodynamic surface of the nose or tail of the...
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3586267 |
ARRANGEMENT IN AND RELATING TO AIRCRAFT
A device for regulating the setting angle of a control surface such as a flap or rudder on an aircraft comprising an inflatable bag located between the control surface and the fuselage. Air for...
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3525576 |
JET FLAP CONTROL
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3451644 |
VERTICAL OR SHORT TAKE-OFF AERODYNE OF HIGH TRANSLATION SPEED
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3356035 |
Runner-impeller for turbine pump
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3348806 |
Spoilers for turbine blades
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