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7585153 |
Upper rotor control system for a counter-rotating rotor system
An upper rotor control system is contained within an upper rotor shaft and upper hub assembly of a contra-rotating rigid rotor system. A collective servo assembly includes a hydraulic actuator that...
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7264199 |
Unloaded lift offset rotor system for a helicopter
A rotor system ( 12 ) for a helicopter ( 10 ) includes a rotating shaft ( 82 ). A gimbaled hub assembly ( 56 ) is coupled to the rotating shaft ( 82 ). Rotating blades ( 24 ) and non-rotating...
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7077629 |
Multi-fan assembly
A multi-fan assembly whose revolution speed can be controlled by a member fan designed with a reverse rotating structure, which includes a housing in which is provided a rotatable member; a...
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7052242 |
Multi-fan assembly comprising a servomotor driven vertical oscillation means for each fan
A multi-fan assembly includes: a down rod assembly having a first end for fixing to a ceiling wall and having a second end provided with a canopy, a rotary assembly being fixed to a lower end of...
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6082967 |
Constant-speed twin spool turboprop unit
A constant-speed twin spool turboprop unit including a twin spool gas generator having a low-pressure spool and a high-pressure spool each including a compressor and a turbine which drives the...
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6053700 |
Ducted turbine
A turbine 400 has a central duct 410 which accelerates fluid passing through it and a blade configuration which retards the flow of fluid near the tips of the turbine. This structure results in a...
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5860788 |
Low drag fan assembly
A fan assembly includes a circular first array of first fan blades; a first primary ring member supportively connecting inner extremities of the first blades about a fan axis, respective end...
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5601257 |
Air vehicle yaw control system
The yaw control in an air vehicle having counter rotating rotors is provided by selectively and controllably applying a frictional drag or braking force to drive gears for the two rotors. Each of...
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5242265 |
Aircraft pitch change mechanism
A system for changing pitch in aircraft propfans is disclosed, in which a motor, located at a stationary position, changes pitch of the blades by of a gear train. Three features of the system are...
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5154580 |
Propeller pitch change mechanism
The invention relates to pitch-change systems for aircraft propfans of the counterrotating type. The pitch of each propfan stage is independently adjustable. Further, in the case where one of the...
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5152668 |
Pitch change mechanism for prop fans
The invention relates to pitch-change systems in aircraft propellers. The invention includes redundant planetary gear systems, each of which can independently change pitch if the other fails. The...
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4936746 |
Counter-rotation pitch change system
A propeller system has a pair of hub assemblies driven in counter-rotation, each hub assembly having a mechanical pitch change actuator, each actuator being provided with a pitch lock that rotates...
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4842484 |
Blade gearing and pitch changing mechanisms for coaxial counterrotating propellers
A lightweight counterrotatable propeller system driven by a rotatable shaft is disclosed. The system includes first and second counterrotatable propellers, each propeller including a plurality of...
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4828518 |
Double reverse revolution propeller apparatus
A double reverse revolution propeller apparatus includes front and rear propeller wherein the rear propeller is rotated at higher speeds than the front propeller. When seizure occurs, an inner...
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4772181 |
Bladed rotor assembly and a control system therefor
A counterrotatable bladed rotor assembly drivable by a rotatable shaft comprises a leading propeller, a trailing propeller, and a gearbox located axially between the two propellers and enclosed by...
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4767270 |
Hoop fan jet engine
A fan jet engine assembly comprising a hoop fan surrounding a turbojet (19) is disclosed. The hoop fan includes a pair of rotatable hubs (27, 29) that encircle the turbojet. A stage of fan blades...
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4621978 |
Counterrotating power turbine
An improved counterrotating power turbine is disclosed. The power turbine includes a support having an annular axial cross-section and forward and aft portions. The forward portion of the support...
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4483658 |
Rotational wake reaction steps for Foils
The action of upstream and downstream foil sets rotating on a common shaft within a fluid is enhanced by fixing certain interrelations of the foils such as the axial distance between the foils, the...
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4367063 |
Pitch control mechanism for coaxial helicopter steering
A directional and yaw control mechanism for coaxial helicopters, comprising a three coaxial ring system interconnected through a cam and link assembly for transmitting control signals from a...
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4347997 |
Helicopters
A helicopter including a power absorber arranged to selectively absorb power from a sustaining rotor system during deceleration. In an illustrated embodiment for a helicopter having a single...
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4170437 |
Helicopter primary flight controls
Yaw control device for helicopters with contra-rotating rotors which controls the anti-torque action of the rotors on the helicopter fuselage by means of a variable speed reduction ratio drive...
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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...
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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...
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3905565 |
Tilt axis dual rotor helicopter and control system
A dual rotor helicopter is comprised of rotor supports tiltable about a line or lines parallel to the longitudinal axis of the vehicle. The rotor blades are mounted for free tilting with respect to...
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3830587 |
AXIAL FLOW FAN ASSEMBLY
An axial flow fan assembly in which two or more fans in series provide successive fan stages which are close together and in which the average pitch angle of the blades of one stage differs...
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3709187 |
PROPULSION AND CONTROL SYSTEM FOR MOTORBOAT
A combination motor boat propulsion and steering control system is shown which is particularly adapted to planing hull, high speed boats. The invented combination will eliminate the need for a...
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3592559 |
VARIABLE GEOMETRY ROTOR SYSTEM
This rotor system is designed to control the nonuniform wake shed from a given rotor blade impinging upon the other blades of the rotor system. The rotor system utilizes blade sets which are of a...
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3574483 |
PITCH CONTROL MECHANISM FOR BLADED ROTOR
Two Z-crank mechanisms connect at different stations to a rotor swashplate so that translation of the mechanisms causes collective pitch variation of the blades and so that rotation of the...
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3570786 |
CONTROL APPARATUS AND METHOD FOR OPERATING AN AIRCRAFT
A control device and method for operating an aircraft having rigid lifting rotors in which the rotor blades can carry steady offset lift vectors. The blades of the rotors are adjustable cyclically...
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3494707 |
CONVERTIPLANE
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3409249 |
Coaxial rigid rotor helicopter and method of flying same
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3409248 |
Rotary winged aircraft with drag propelling rotors and controls
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3393747 |
Controllers for air cushion craft
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3391745 |
Apparatus for operating propellers
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3388748 |
Apparatus for operating propellers
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3273653 |
Rotary wing aircraft
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3199601 |
Flight control system
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3184183 |
Flying platform
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3184181 |
Convertiplane with control mechanism
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3181810 |
Attitude control system for vtol aircraft
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3176774 |
Helicopter drive control
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3155343 |
Convertible aircraft structure
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3141668 |
Twin rotor helicopter roundabout
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3096043 |
Aerodynes having a slipstream-assisted wing system
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3008524 |
Control system for four power units and the combination
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2989125 |
Differential system with variable diameter sheaves
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2982361 |
Variable camber blading
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2973042 |
Multi-engine aircraft feather indicating system
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2954945 |
Helicopter aircraft control
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2868476 |
Convertiplane with tiltable cylindrical wing
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