| Patents for B64C 11 - Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft (3,644) |
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| 02/21/1995 | US5391053 Active noise control using noise source having adaptive resonant frequency tuning through variable panel loading |
| 02/15/1995 | EP0638726A1 Fan blade |
| 01/24/1995 | US5383767 Blade-hub linkage device with a laminate attachment |
| 01/17/1995 | US5382134 Active noise control using noise source having adaptive resonant frequency tuning through stiffness variation |
| 01/17/1995 | US5381985 Wingtip mounted, counter-rotating proprotor for tiltwing aircraft |
| 12/27/1994 | US5375978 Foreign object damage resistant composite blade and manufacture |
| 12/21/1994 | EP0495964B1 A propeller control system |
| 12/07/1994 | EP0626917A1 Composite fan blade |
| 12/07/1994 | CN1026880C Gyrocraft rotor hub body |
| 12/01/1994 | DE4411679C1 Blade of fibre-composite construction having a protective profile |
| 11/24/1994 | DE4316712A1 Self-regulating propellor (airscrew) |
| 11/23/1994 | EP0506891B1 Pitch control system |
| 11/17/1994 | EP0586511A4 Propulsive thrust ring system. |
| 11/15/1994 | US5364231 Full authority propeller pitch control |
| 11/10/1994 | DE4331825A1 Method and device for hydraulic adjustment (displacement) of a propeller of an aircraft |
| 11/10/1994 | DE4315080A1 Blade mounting for propellers, rotors or fans |
| 11/08/1994 | US5362205 Method and apparatus for synchronizing the speed and phase of plural propellers of an aircraft |
| 10/11/1994 | US5354176 Fan blade mount |
| 10/06/1994 | DE4400621A1 Pusher-type propeller drive for aircraft, land vehicles or water craft |
| 10/05/1994 | EP0522035B1 Propeller with twistable blades |
| 10/04/1994 | CA2075752C Increasing lift on helicopter rotor blades and airplane propellers |
| 09/21/1994 | EP0615903A1 Rotary blades |
| 09/21/1994 | CN1025951C Gearing differential mechanism for coaxial rotorplane |
| 09/01/1994 | WO1994019234A1 Rotating thrust-producing apparatus |
| 08/30/1994 | CA1331697C Flexible connector for use in aircraft |
| 08/17/1994 | EP0610273A1 Composite blade manufacture. |
| 08/03/1994 | EP0448559B1 Lift-jet engine for independent operation or for use in an aircraft |
| 08/02/1994 | US5335175 Propeller control system |
| 07/26/1994 | US5332362 Blade for aircraft rotary wings, with swept-back tip |
| 07/19/1994 | US5331559 Apparatus for preventing propeller overshoot |
| 07/14/1994 | DE4243143A1 Water tornado spiral for low wear drive of pumps and turbines |
| 07/12/1994 | US5328333 Rotating thrust-producing apparatus |
| 07/12/1994 | US5328330 Extruded aluminum fan blade |
| 07/07/1994 | WO1994014511A1 Apparatus for controlling posture of radio-controlled helicopter for hobby use |
| 06/29/1994 | EP0604299A1 Blade-hub lamellar connection device, rotor blade and rotor featuring it |
| 06/29/1994 | EP0604298A1 Composite thermoplastic blade, in particular for helicopter shrouded tail rotor, and its manufacturing process |
| 06/29/1994 | EP0604297A1 Composite thermoplastic blade, in particular for helicopter shrouded tail rotor, and its manufacturing procedure with injection stop |
| 06/29/1994 | CN1025175C Fan blade mount for air plane driving system |
| 06/24/1994 | CA2111889A1 Blade made of thermoplastic composite, in particular for ducted tail rotor of a helicopter, and its method of manufacture |
| 06/24/1994 | CA2111887A1 Blade made of thermoplastic composite, in particular for ducted tail rotor of a helicopter, and its method of manufacture with injection step |
| 06/24/1994 | CA2111373A1 Blade-hub linkage device with a laminate attachment, rotor blade fitted with such an attachment, and rotor equipped with such blades |
| 05/24/1994 | CA1329837C Pitch control capacitance coupling |
| 05/18/1994 | EP0597037A1 Pitch stop assembly for variable pitch propulsor |
| 04/28/1994 | WO1994008846A1 Propeller |
| 04/26/1994 | US5306120 System to protect against erosion a body subjected to an airflow |
| 04/26/1994 | US5306119 Ducted tail rotor for rotor craft |
| 04/21/1994 | DE4234650A1 Helicopter bladed rotor generating suction or thrust force - has sound absorbing, damping element behind rotor face in rotor rotation sense |
| 04/20/1994 | EP0592764A1 The propeller |
| 04/05/1994 | US5299912 Drive system for changing the diameter of a variable diameter rotor |
| 04/05/1994 | US5299911 Electric pitch control apparatus for variable-pitch propeller |
| 03/29/1994 | CA1328056C Energy efficient asymmetric pre-swirl vane and twisted propeller propulsion system |
| 03/23/1994 | EP0587582A1 A fibre reinforced component and a method of manufacturing such a component. |
| 03/22/1994 | US5295789 Turbomachine flow-straightener blade |
| 03/22/1994 | US5295641 System for reducing vibrations in the cabin of an aircraft |
| 03/22/1994 | CA1328004C Aircraft cabin noise control apparatus |
| 03/17/1994 | WO1994005545A1 Increasing lift on helicopter rotor blades and airplane propellers |
| 03/17/1994 | DE4231676C1 Motor-driven foldable propeller for motorised glider - has propeller located at stern, and is retracted into glider body |
| 03/16/1994 | EP0586511A1 Propulsive thrust ring system |
| 03/08/1994 | US5292088 Propulsive thrust ring system |
| 03/03/1994 | DE4229430A1 Rotor blade adjusting mechanism - has adjusting rod, extending through rotor shaft and coupled positively to blades. |
| 03/02/1994 | EP0507860B1 Pitch control system |
| 03/01/1994 | US5291410 Circuitry for synchronizing the speed of a plurality of engines by sequentially averaging phase difference with a reference phase representing a desired speed |
| 02/16/1994 | CN2156133Y Simple propeller civil airplane |
| 02/08/1994 | US5284419 Propeller with blades which can be twisted |
| 02/08/1994 | US5284418 Electric pitch control apparatus for variable pitch propeller capable of controlling the pitch angle based instantaneous operational conditions of the propeller |
| 02/03/1994 | WO1994002357A1 Variable diameter rotor drive system |
| 02/01/1994 | US5282719 Quad mode fan pitch actuation system for a gas turbine engine |
| 01/25/1994 | US5281099 Integrated spline/cone seat subassembly for a rotor assembly having ducted, coaxial counter-rotating rotors |
| 01/25/1994 | US5281095 Variable-pitch mechanism for a propeller |
| 01/25/1994 | US5281094 Electromechanical apparatus for varying blade of variable-pitch fan blades |
| 01/20/1994 | DE4223365A1 Drive for air craft, helicopter etc. - has self activating floating body for disc rotor which is attached to shaft(s) and has profiled front face and chambers |
| 01/18/1994 | US5279892 Composite airfoil with woven insert |
| 01/05/1994 | EP0455797B1 Apparatus and method for folding and locking rotor blades |
| 12/28/1993 | CA1325627C Composite material blade and fabrication process thereof |
| 12/14/1993 | US5269658 Composite blade with partial length spar |
| 12/14/1993 | US5269657 Aerodynamically-stable airfoil spar |
| 12/09/1993 | WO1993024365A1 Variable diameter rotor having an offset twist |
| 12/07/1993 | US5267833 Gyrocraft rotor hub body |
| 11/24/1993 | EP0570527A1 Lightweight propulsor blade. |
| 11/23/1993 | US5263898 In a gas turbine engine |
| 11/18/1993 | DE4215543A1 All-blade propeller functioning as turbine - has hollow blades acting as combustion chambers and gas discharge nozzles |
| 11/04/1993 | DE4317493A1 Turbulence reduction system for flow surfaces or aircraft or ships' propellers - involves using rotating discs formed integrally with ends of flow surfaces |
| 11/03/1993 | CN1077928A Screw propeller |
| 10/20/1993 | CN1022505C Non variable capacitance type rotary machine |
| 10/19/1993 | US5253979 Variable diameter rotor having an offset twist |
| 10/13/1993 | EP0565413A1 Rotorcraft rotor blade with tip sweepback |
| 10/12/1993 | US5252160 Method of manufacturing a metal/composite spinner cone |
| 10/12/1993 | US5252100 Variable rotor-blade-attack angle helicopter toy |
| 10/05/1993 | US5249928 Fixed pitch propeller |
| 10/05/1993 | US5249925 Variable-pitch multi-blade rotor, in particular for the rear anti-torque system of a rotating wing aircraft |
| 09/29/1993 | EP0562527A1 Tail rotor for rotor craft |
| 09/23/1993 | DE4237182A1 Ducted fan airscrew for aircraft - has air screw directly flanged onto single drive motor with duct in tailplane |
| 09/22/1993 | EP0561046A1 Erosion shield for an aerofoil surface |
| 09/15/1993 | EP0559990A1 Pitch change control system |
| 09/14/1993 | US5243758 Design and processing method for manufacturing hollow airfoils (three-piece concept) |
| 09/07/1993 | US5242265 Aircraft pitch change mechanism |
| 09/02/1993 | WO1993016914A1 Composite fan blade |
| 09/02/1993 | DE4206066A1 Propeller or rotor blades - are designed to reduce eddies and air or water resistance and have toothed leading and trailing edges |
| 08/31/1993 | US5240377 Composite fan blade |
| 08/31/1993 | US5240204 Lift generating method and apparatus for aircraft |