Patents
Sitemap › B64 - Aircraft; Aviation; Cosmonautics › B64C - Aeroplanes; Helicopters › B64C 27 - Rotorcraft; Rotors peculiar thereto
Patents for B64C 27 - Rotorcraft; Rotors peculiar thereto (10,112)
12/1991
12/10/1991US5070955 Passively stable hovering system
12/05/1991DE4017402A1 Blades of helicopter rotor - are stabilised by stabilising rods connected to swash plate
12/04/1991EP0459937A1 Improved spar-to-hub joint for a flexbeam helicopter rotor
12/03/1991US5069318 Self-stabilized stepped crashworthy stiffeners
11/1991
11/26/1991US5067875 Composite scissors for a swashplate
11/26/1991US5067668 Compound helicopter with no tail rotor
11/21/1991EP0457711A1 Split torque helicopter main rotor drive including an elastomeric torsional vibration damper
11/21/1991EP0457710A2 An unmanned flight vehicle including counter rotating rotors positioned within a toroidal shroud and operable to provide all required vehicle flight controls
11/21/1991EP0457646A1 Swashplate device supported on mounts decoupled in pitch and roll, for the rotor blades pitch control of a rotorcraft
11/17/1991CA2042002A1 Elastomeric torsional isolator
11/13/1991EP0456384A1 Link and bearing for rotary coupling
11/12/1991US5064143 Aircraft, having a pair of counter rotating rotors
11/06/1991EP0455580A2 Hover position hold system for rotary winged aircraft
10/1991
10/22/1991US5059094 Rotor redundant force retention system for vtol and vstol aircraft
10/22/1991US5058825 Steering aid for rotor aircraft
10/17/1991WO1991015709A1 Motor vehicle vibration isolation support mounting system
10/17/1991WO1991015399A1 Propeller with twistable blades
10/16/1991EP0452248A2 Composite scissors for a swashplate
10/09/1991EP0451084A2 Flexbeam helicopter rotor with improved snubber-vibration damper between the torque tube and the flexible spar member
10/07/1991CA2036598A1 Flexbeam helicopter rotor with improved snubber-vibration damper between the torque tube and the flexible spar member
10/02/1991EP0449531A1 Rotors
10/02/1991EP0448559A1 Lift-jet engine for independent operation or for use in an aircraft.
10/02/1991DE4010211A1 Propeller blade twisting about its radial axis - is constructed from longitudinal segments divided transversely into smaller segments
09/1991
09/24/1991US5050835 Active accumulator vibration absorbing support system
09/18/1991EP0447307A1 Hydraulic damper and elastohydraulic return device composed of such a damper
09/11/1991CN1013853B Vertically taking-off aircraft
09/10/1991US5047106 Method for fabricating a flexbeam of a helicopter rotor blade
09/10/1991US5046923 Helicopter autorotation detection and recovery
09/05/1991WO1991012953A1 Method and apparatus for structural actuation and sensing in a desired direction
09/05/1991DE4024328A1 Balancing dynamic alternating forces of rotor systems - using axle deflection sensors and controlling positioned of small weights
08/1991
08/29/1991DE4005896A1 Rotor blade arrangement for depth balancing - applies balance wt. in halves about rotor axis without affecting static longitudinal moment
08/29/1991DE4005895A1 Rotor blade balancing arrangement for rotor with hollow chamber - has balance wt. and pad layers forming equal thickness packets on either side of blade axis
08/28/1991EP0443901A1 Rotorcraft main gearbox having an emergency lubrication device
08/27/1991US5042967 Drive shaft and rotor hub for helicopter flexible rotor system
08/27/1991US5042747 Autogyro
08/20/1991US5041182 Method of manufacturing composite material blade
08/06/1991US5037041 Cockpit, especially for a helicopter
08/03/1991WO1991011341A1 Vibration isolation support mounting system
08/03/1991CA2074831A1 Vibration isolation support mounting system
07/1991
07/31/1991EP0438792A2 Method and apparatus for fabricating unidirectional materials for helicopter parts
07/31/1991CN1053401A Rotatable viscoelastic arrangement for buffer and elastic recovery in rotor blades track for rotorcraft and rotor head including arrangement
07/30/1991US5035577 Blade for an aircraft rotor and rotor comprising such a blade
07/30/1991US5035377 Free standing or aircraft lift generator
07/16/1991US5031858 Apparatus and method for folding and locking rotor blades
07/10/1991WO1991010575A1 Continuously active pressure accumulator power transfer system
07/10/1991CA2072870A1 Continuously active pressure accumulator power transfer system
07/04/1991DE3943075A1 Aircraft propeller blade - is twisted about radial axis and is constructed from segments enclosed in elastic envelope
06/1991
06/25/1991US5026254 Calibrated pitch change link
06/25/1991US5026002 Vertical take-off and landing
06/19/1991CN1012889B Composite helicopter swashplate
05/1991
05/30/1991WO1991007314A1 Apparatus and method for folding and locking rotor blades
05/28/1991US5018698 Motor vehicle vibration isolation support mounting system
05/14/1991USRE33589 Helicopter blade airfoil
05/14/1991US5014544 Method and apparatus for detecting cracks in helicopter rotor blades
05/02/1991WO1991005702A1 Rotor redundant force retention system for vtol and vstol aircraft
05/02/1991WO1991005701A1 Pitch change bearing system
05/02/1991WO1991005700A1 Rotor blade
05/02/1991WO1991005698A1 Jam resistant ball screw actuator
05/02/1991WO1991005697A1 Calibrated pitch change link
04/1991
04/30/1991US5011373 Individual pitch control device for blades of rotors of rotor craft by means of rotating linear jacks
04/24/1991EP0424267A1 Rotary visco-elastic return and lag-damping device for a rotorcraft blade, and rotor head
04/17/1991CN1012353B Blade for high-performance shrouded propeller
04/16/1991US5007799 Flapping restrainer device for rotorcraft rotor blades, and rotor head comprising said device
04/10/1991EP0421631A1 Helicopter rotors
04/10/1991EP0421061A1 Rotor with flapping hinged blades connection in the rotor centre
04/02/1991US5004215 Resilient return strut of the elastic-hydraulic type with incorporated linear damping by throttling a high-viscosity fluid
03/1991
03/30/1991WO1991005201A1 Active accumulator vibration absorbing system
03/30/1991CA2065869A1 Active accumulator vibration absorbing system
03/27/1991EP0418843A1 Method of manufacturing composite material blade
03/27/1991EP0418441A1 Rotary wing aircraft shrouded propeller tail assembly
03/21/1991WO1991003623A1 System and method for suppressing noise produced by rotors
03/20/1991EP0250473B1 Device for producing a forward drive force
03/19/1991US5000398 Flying multi-purpose aircraft carrier and method of V/STOL assisted flight
03/05/1991US4997414 Torque equalizer for contrarotary shafts
02/1991
02/20/1991EP0413656A1 Programmable, linear collective control system for a helicopter
02/19/1991CA1280297C Convertible turbo-fan/shaft aircraft propulsion engine
02/05/1991US4990205 Composite
02/05/1991CA1279767C Gas turbine engine with variable bypass means
01/1991
01/29/1991US4988084 Spring element for connecting two components with angle of rotation mobility
01/22/1991US4986735 A helicopter
01/20/1991CA2013697A1 Dual output planetary gear system
01/15/1991US4984754 Heli-hover amphibious surface effect vehicle
01/08/1991US4983153 Gear unit, particularly for use in a helicopter
01/08/1991US4982914 Aircraft with a plurality of propellers, a pipe structure for thereon holdable wings, for vertical take off and landing
12/1990
12/27/1990EP0403750A2 Rotor with blades flapping joint in the rotor centre
12/27/1990CA1278287C2 Composite material propeller blade and process therefor
12/25/1990US4980835 Control law system for X-Wing aircraft
12/12/1990EP0402236A1 Retractable restrainer device for rotorcraft rotor blades, and rotor head equipped with it
12/11/1990US4976669 Dual output planetary gear system
12/11/1990US4976587 Composite wind turbine rotor blade and method for making same
12/04/1990US4975022 Helicopter rotor blades
12/04/1990US4975021 Rotor, in particular a helicopter rotor
12/04/1990US4974794 Elastic strut having an integrated hydromechanical resonator in particular for the suspension of a transmission box on a rotor aircraft and a suspension device using such a strut
11/1990
11/20/1990US4970860 Fluid coupling for helicopter propeller
11/15/1990WO1990013478A1 Annular body aircraft
10/1990
10/30/1990US4966526 Mechanically actuated slot for circulation control rotor
10/24/1990EP0394180A2 Roll vibration absorber
10/24/1990EP0393410A2 Aircraft with a pair of contra-rotating propellers
10/23/1990US4965879 X-wing fly-by-wire vehicle management system
10/19/1990CA2014774A1 Aircraft, having a pair of counter rotating rotors
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