B64CAEROPLANESHELICOPTERSAs far as possible, classification is made according to constructional features; classification according to particular kinds of aircraft is normally regarded as being of secondary importance, except in cases where this is considered to be the characteristic feature.The following IPC groups are not in the CPC scheme. The subject matter for these IPC groups is classified in the following CPC groups: B64C35/02 covered by B64C35/00In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme. B64C1/00Aircraft structures or fairings B64C1/00FuselagesConstructional features common to fuselages, wings, stabilising surfaces or the likeGroup B64C1/00 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00 - B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C1/0009Aerodynamic aspectsGroup B64C1/0009 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00 - B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C2001/0018comprising two decks adapted for carrying passengers only B64C2001/0027arranged one above the other B64C2001/0036arranged side by side at the same level B64C2001/0045Fuselages characterised by special shapes B64C2001/0054Fuselage structures substantially made from particular materials B64C2001/0063from wood B64C2001/0072from composite materials B64C2001/0081from metallic materials B64C2001/009comprising decompression panels or valves for pressure equalisation in fuselages or floors B64C1/06FramesStringersLongerons ; Fuselage sectionsGroup B64C1/06 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00-B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00-B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C1/061FramesGroup B64C1/061 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00-B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00-B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C1/062specially adapted to absorb crash loadsGroup B64C1/062 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00 - B64U30/40, B64U40/00-B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C1/063Folding or collapsing to reduce overall dimensions, e.g. foldable tail booms folding or collapsing wings B64C3/56Group B64C1/063 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00 - B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C1/064Stringers; LongeronsGroup B64C1/064 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00 - B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C1/065SparsGroup B64C1/065 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00 - B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C1/066Interior liners B64C1/067comprising means for preventing icing or condensation conditions B64C1/068Fuselage sectionsGroup B64C1/068 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00 - B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C1/0683Nose cones B64C1/0685Tail cones B64C1/069Joining arrangements thereforGroup B64C1/069 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00 - B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C1/08Geodetic or other open-frame structures B64C1/10Bulkheads B64C1/12Construction or attachment of skin panels B64C1/14WindowsDoorsHatch covers or access panelsSurrounding frame structuresCanopiesWindscreens accessories therefor, e.g. pressure sensors, water deflectors, hinges, seals, handles, latches, windscreen wipersfairings movable in conjunction with undercarriage elements B64C25/16; bomb doors B64D1/06 B64C1/1407Doors; surrounding frames B64C1/1415Cargo doors, e.g. incorporating ramps B64C1/1423Passenger doors B64C1/143of the plug type B64C1/1438of the sliding type B64C1/1446Inspection hatches for engine cowls B64D29/08 B64C1/1453Drain masts B64C1/1461Structures of doors or surrounding frames B64C1/1469Doors between cockpit and cabin B64C1/1476Canopies; Windscreens or similar transparent elements B64C1/1484Windows B64C1/1492 takes precedence B64C1/1492Structure and mounting of the transparent elements in the window or windscreen B64C1/16specially adapted for mounting power plant B64C1/18Floors B64C1/20specially adapted for freight B64C1/22Other structures integral with fuselages to facilitate loading , e.g. cargo bays, cranes cargo door type ramps B64C1/1415 B64C1/24Steps mounted on, and retractable within, fuselages B64C1/26Attaching the wing or tail units or stabilising surfacesGroup B64C1/26 is impacted by reclassification into groups B64U20/50 and B64U30/12 - B64U30/16.
Groups B64C1/26, B64U20/50 and B64U30/12 - B64U30/16 should be considered in order to perform a complete search. B64C1/28Parts of fuselage relatively movable to improve pilots view B64C1/30Parts of fuselage relatively movable to reduce overall dimensions of aircraftGroup B64C1/30 is impacted by reclassification into group B64U20/50.
Groups B64C1/30 and B64U20/50 should be considered in order to perform a complete search. B64C1/32Severable or jettisonable parts of fuselage facilitating emergency escape B64C1/34comprising inflatable structural components B64C1/36adapted to receive antennas or radomes B64C1/38Constructions adapted to reduce effects of aerodynamic or other external heating cooling structural parts of aircrafts with air flow B64D13/006 B64C1/40Sound or heat insulation , e.g. using insulation blankets B64C1/403Arrangement of fasteners specially adapted therefor, e.g. of clips in vehicles in general B60R13/0206 B64C1/406in combination with supports for lines, e.g. for pipes or cables arrangement of elements of electric or fluid circuits specially adapted for vehicles, in general B60R16/00; supports for pipes, cables or protective tubing F16L3/00; installations of electric cables or lines in vehicles H02G3/00 B64C3/00Wings ornithopter wings B64C33/02 B64C3/10Shape of wings B64C3/14Aerofoil profile B64C3/141Circulation Control Airfoils B64C2003/142with variable camber along the airfoil chord B64C2003/143comprising interior channels B64C2003/144including a flat surface on either the extrados or intrados B64C2003/145comprising 'Gurney' flaps B64C2003/146comprising leading edges of particular shape B64C2003/147comprising trailing edges of particular shape B64C2003/148comprising protuberances, e.g. for modifying boundary layer flow B64C2003/149for supercritical or transonic flow B64C3/16Frontal aspect B64C3/18SparsRibsStringers B64C3/182Stringers, longerons B64C3/185Spars B64C3/187Ribs B64C3/20Integral or sandwich constructions B64C3/22Geodetic or other open-frame structures B64C3/24Moulded or cast structures B64C3/26Construction, shape, or attachment of separate skins, e.g. panels B64C3/28Leading or trailing edges attached to primary structures, e.g. forming fixed slots B64C3/30comprising inflatable structural components B64C3/32specially adapted for mounting power plant B64C3/34Tanks constructed integrally with wings, e.g. for fuel or water B64C3/36Structures adapted to reduce effects of aerodynamic or other external heating cooling structural parts of aircrafts with air flow B64D13/006 B64C3/38Adjustment of complete wings or parts thereof B64C3/385Variable incidence wings B64C3/40Varying angle of sweep B64C3/42Adjusting about chordwise axes B64C3/44Varying camber B64C2003/445by changing shape according to the speed, e.g. by morphing B64C3/46by inflatable elements B64C3/48by relatively-movable parts of wing structures B64C3/50by leading or trailing edge flaps B64C3/52Warping B64C3/54Varying in area B64C2003/543by changing shape according to the speed, e.g. by morphing B64C3/546by foldable elements B64C3/56Folding or collapsing to reduce overall dimensions of aircraftGroup B64C3/56 is impacted by reclassification into groups B64U20/50 and B64U30/12 - B64U30/16.
Groups B64C3/56, B64U20/50 and B64U30/12 - B64U30/16 should be considered in order to perform a complete search. B64C3/58provided with fences or spoilers adjustable for control purposes B64C9/00 B64C5/00Stabilising surfaces B64C5/02Tailplanes B64C5/04Noseplanes B64C5/06Fins B64C5/08 takes precedence B64C5/08mounted on, or supported by, wings B64C5/10adjustable B64C5/12for retraction against or within fuselage or nacelle B64C5/14Varying angle of sweep B64C5/16about spanwise axes B64C5/18in area B64C7/00Structures or fairings not otherwise provided for B64C7/02Nacelles B64C9/00 B64C9/00Adjustable control surfaces or members, e.g. rudders trimming stabilising surfaces B64C5/10 B64C2009/005Ailerons B64C9/02Mounting or supporting thereof B64C9/04with compound dependent movements B64C9/06with two or more independent movements B64C9/08bodily displaceable B64C9/10one surface adjusted by movement of another, e.g. servo tabs B64C9/04 takes precedence; adjusting surfaces of different type or function B64C9/12 B64C9/12surfaces of different type or function being simultaneously adjusted B64C9/14forming slots B64C2009/143comprising independently adjustable elements for closing or opening the slot between the main wing and leading or trailing edge flaps B64C9/146at an other wing location than the rear or the front wings provided with fixed fences or spoilers B64C3/58 B64C9/16at the rear of the wing B64C9/18by single flaps B64C9/20by multiple flaps B64C9/22at the front of the wing B64C9/24by single flap B64C9/26by multiple flaps B64C9/28by flaps at both the front and rear of the wing operating in unison B64C9/30Balancing hinged surfaces, e.g. dynamically B64C9/32Air braking surfaces B64C9/323associated with wings B64C9/326associated with fuselages B64C9/34collapsing or retracting against or within other surfaces or other members B64C9/36the members being fuselages or nacelles B64C9/38Jet flaps B64C11/00Propellers, e.g. of ducted typeFeatures common to propellers and rotors for rotorcraft Documents classified in B64C11/001 - B64C11/008 which also contain relevant information, covered by other subgroups of B64C11/00, are also classified in the appropriate subgroup of B64C11/00 B64C11/001Shrouded propellers B64C11/002Braking propellers, e.g. for measuring the power output of an engine B64C11/003Variable-diameter propellers; Mechanisms therefor B64C11/005Spiral-shaped propellers B64C11/006Paddle wheels B64C11/007Propulsive discs, i.e. discs having the surface specially adapted for propulsion purposes B64C11/008characterised by vibration absorbing or balancing means for rotorcraft B64C27/001 B64C11/02Hub construction B64C11/04Blade mountings B64C11/06for variable-pitch blades B64C11/065variable only when stationary B64C11/08for non-adjustable blades B64C11/10rigid B64C11/12flexible B64C11/14Spinners B64C11/16Blades B64C11/18Aerodynamic features B64C11/20Constructional features B64C11/205for protecting blades, e.g. coating B64C11/22Solid blades B64C11/24Hollow blades B64C11/26Fabricated blades B64C11/28Collapsible or foldable blades B64C11/30Blade pitch-changing mechanisms Groups B64C11/301, B64C11/303, B64C11/305 and B64C11/306 take precedence over B64C11/32, B64C11/38 and B64C11/44 B64C11/301characterised by blade position indicating means B64C11/303characterised by comprising a governor B64C11/305characterised by being influenced by other control systems, e.g. fuel supply B64C11/306specially adapted for contrarotating propellers B64C11/308automatic B64C11/32mechanical B64C11/325comprising feathering, braking or stopping systems B64C11/34automatic B64C11/343actuated by the centrifugal force or the aerodynamic drag acting on the blades B64C11/346actuated by the centrifugal force or the aerodynamic drag acting on auxiliary masses or surfaces B64C11/36non-automatic B64C11/38fluid, e.g. hydraulic B64C11/385comprising feathering, braking or stopping systems B64C11/40automatic B64C11/42non-automatic B64C11/44electric B64C11/46Arrangements of, or constructional features peculiar to, multiple propellers B64C11/306 takes precedence B64C11/48Units of two or more coaxial propellers B64C11/50Phase synchronisation between multiple propellers B64C13/00Control systems or transmitting systems for actuating flying-control surfaces, lift-increasing flaps, air brakes, or spoilers B64C13/02Initiating means B64C13/04actuated personally B64C13/042operated by hand B64C13/0421control sticks for primary flight controls B64C13/0423yokes or steering wheels for primary flight controls B64C13/0425for actuating trailing or leading edge flaps, air brakes or spoilers B64C13/0427for actuating trim B64C13/044operated by feet, e.g. pedals B64C13/06adjustable to suit individual persons B64C13/08Trimming zero positions B64C13/10comprising warning devices B64C13/12Dual control apparatus B64C13/14lockable B64C13/16actuated automatically, e.g. responsive to gust detectors B64C13/18using automatic pilot B64C13/20using radiated signals B64C13/22readily revertible to personal control B64C13/24Transmitting means B64C13/26without power amplification or where power amplification is irrelevant B64C13/28mechanical B64C13/30using cable, chain, or rod mechanisms B64C13/32using cam mechanisms B64C13/34using toothed gearing B64C13/341having duplication or stand-by provisions B64C13/343overriding of personal controls; with automatic return to inoperative position B64C13/345with artificial feel B64C13/36fluid B64C13/38with power amplification B64C13/40using fluid pressure B64C13/42having duplication or stand-by provisions B64C13/44overriding of personal controlswith automatic return to inoperative position B64C13/46with artificial feel B64C13/48characterised by the fluid being gaseous B64C13/50using electrical energy B64C13/503Fly-by-Wire B64C13/504using electro-hydrostatic actuators [EHA's] B64C13/505having duplication or stand-by provisions B64C13/506overriding of personal controls; with automatic return to inoperative position B64C13/507with artificial feel B64C15/00Attitude, flight direction, or altitude control by jet reaction B64C15/02the jets being propulsion jets B64C15/12the power plant being tiltable B64C15/14the jets being other than main propulsion jets jet flaps B64C9/38 B64C17/00Aircraft stabilisation not otherwise provided for B64C17/02by gravity or inertia-actuated apparatus B64C17/04by pendular bodies B64C17/06by gyroscopic apparatus B64C17/08by ballast supply or discharge B64C17/10Transferring fuel to adjust trim B64C19/00Aircraft control not otherwise provided for B64C19/02Conjoint controls B64C21/00Influencing air flow over aircraft surfaces, not otherwise provided for B64C21/00Influencing air flow over aircraft surfaces by affecting boundary layer flowGroup B64C21/00 is impacted by reclassification into group B64C21/01.
Groups B64C21/00 and B64C21/01 should be considered in order to perform a complete search. B64C21/01Boundary layer ingestion [BLI] propulsionGroup B64C21/01 is incomplete pending reclassification of documents from groups B64C21/00, B64C21/025, B64C21/04, B64C21/06 and B64C21/08. 
All groups listed in this Warning should be considered in order to perform a complete search. B64C21/02by use of slot, ducts, porous areas or the like B64C21/025for simultaneous blowing and suckingGroup B64C21/025 is impacted by reclassification into group B64C21/01.
All groups listed in this Warning should be considered in order to perform a complete search. B64C21/04for blowingGroup B64C21/04 is incomplete pending reclassification of documents from group B64C21/08.
Group B64C21/04 is also impacted by reclassification into group B64C21/01.
All groups listed in this Warning should be considered in order to perform a complete search. B64C21/06for sucking BLI propulsion B64C21/01Group B64C21/06 is incomplete pending reclassification of documents from group B64C21/08.
Group B64C21/06 is also impacted by reclassification into group B64C21/01.
All groups listed in this Warning should be considered in order to perform a complete search. B64C21/08adjustableGroup B64C21/08 is impacted by reclassification into group B64C21/04, B64C21/06 and B64C21/01.
All groups listed in this Warning should be considered in order to perform a complete search. B64C21/10using other surface properties, e.g. roughness B64C23/00Influencing air flow over aircraft surfaces, not otherwise provided for B64C23/005by other means not covered by groups B64C23/02 - B64C23/08, e.g. by electric charges, magnetic panels, piezoelectric elements, static charges or ultrasounds B64C23/02by means of rotating members of cylindrical or similar form B64C23/04by generating shock waves B64C23/06by generating vortices B64C23/065at the wing tips B64C23/069using one or more wing tip airfoil devices, e.g. winglets, splines, wing tip fences or raked wingtips B64C23/072the wing tip airfoil devices being moveable in their entirety B64C23/076the wing tip airfoil devices comprising one or more separate moveable members thereon affecting the vortices, e.g. flaps B64C23/08using Magnus effect B64C25/00 B64C25/00Alighting gear air-cushion alighting gear B60V3/08 B64C25/001Devices not provided for in the groups B64C25/02 - B64C25/68 B64C2025/003Means for reducing landing gear noise, or turbulent flow around it, e.g. landing gear doors used as deflectors B64C2025/005Tail skids for fuselage tail strike protection on tricycle landing gear aircraft B64C2025/006Landing gear legs comprising torque arms B64C2025/008Comprising means for modifying their length, e.g. for kneeling, for jumping, or for leveling the aircraft B64C25/02Undercarriages B64C25/04Arrangement or disposition on aircraft B64C25/06fixed B64C25/08non-fixed, e.g. jettisonable B64C25/10retractable, foldable, or the like B64C25/12sideways B64C2025/125into the fuselage, e.g. main landing gear pivotally retracting into or extending out of the fuselage B64C25/14fore-and-aft B64C25/16Fairings movable in conjunction with undercarriage elements B64C25/18Operating mechanisms B64C25/20mechanical B64C25/22fluid B64C25/24electric B64C25/26Control or locking systems therefor B64C25/28with indicating or warning devices B64C25/30emergency actuated B64C25/32characterised by elements which contact the ground or similar surface  arrester hooks B64C25/68 B64C2025/325specially adapted for helicopters B64C25/34wheeled type, e.g. multi-wheeled bogies B64C2025/345Multi-wheel bogies having one or more steering axes B64C25/36Arrangements or adaptations of wheels, tyres or axles in general B64C25/38endless-track type B64C25/40the elements being rotated before touch-down B64C25/405Powered wheels, e.g. for taxing B64C25/42Arrangement or adaptation of brakes B64C25/423Braking devices acting by reaction of gaseous medium B64C25/426 takes precedence; using rockets B64D27/023 B64C25/426Braking devices providing an automatic sequence of braking B64C25/44Actuating mechanisms B64C25/445Brake regulators for preventing somersaulting B64C25/46Brake regulators for preventing skidding or aircraft somersaulting B64C25/48differentially operated for steering purposes B64C25/50Steerable undercarriagesShimmy-damping B64C25/505Shimmy damping B64C25/52Skis or runners B64C25/54Floats B64C25/56inflatable B64C25/58Arrangements or adaptations of shock-absorbers or springs shimmy-dampers B64C25/50 B64C25/60Oleo legs B64C25/62Spring shock-absorbersSprings B64C25/64using rubber or like elements B64C25/66Convertible alighting gearCombinations of different kinds of ground or like engaging elements B64C25/68Arrester hooks B64C27/00Aircraft kinds or components not otherwise provided for B64C27/00RotorcraftRotors peculiar thereto B64C27/001Vibration damping devices B64C2027/002mounted between the rotor drive and the fuselage B64C2027/003mounted on rotor hub, e.g. a rotary force generator B64C2027/004using actuators, e.g. active systems B64C2027/005using suspended masses B64C27/006Safety devices B64C27/007adapted for detection of blade cracks B64C27/008Rotors tracking or balancing devices B64C27/02Gyroplanes B64C27/021Rotor or rotor head construction for helicopters B64C27/32 B64C27/022Devices for folding or adjusting the blades B64C27/023Construction of the blades; Coating of the blades B64C27/024Devices for shifting the rotor axis B64C27/025Rotor drives, in particular for taking off; Combination of autorotation rotors and driven rotors B64C27/026Devices for converting a fixed wing into an autorotation rotor and viceversa B64C27/027Control devices using other means than the rotor B64C27/028Other constructional elements; Rotor balancing B64C27/04Helicopters B64C27/06with single rotor B64C27/08with two or more rotorsGroup B64C27/08 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00 - B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C27/10arranged coaxiallyGroup B64C27/10 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00 - B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C27/12Rotor drives B64C2027/125including toroidal transmissions, e.g. of the CVT type B64C27/14Direct drive between power plant and rotor hub B64C27/16Drive of rotors by means, e.g. propellers, mounted on rotor blades B64C27/18the means being jet-reaction apparatus B64C27/20Rotorcraft characterised by having shrouded rotors, e.g. flying platformsGroup B64C27/20 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00 - B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C27/22Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft B64C27/24with rotor blades fixed in flight to act as lifting surfaces B64C27/26characterised by provision of fixed wings B64C27/28with forward-propulsion propellers pivotable to act as lifting rotors B64C27/30with provision for reducing drag of inoperative rotor B64C27/32Rotors B64C27/322Blade travel limiting devices, e.g. droop stops B64C27/325Circulation-control rotors B64C27/327Retention means relieving the stress from the arm, e.g. tie-bars B64C27/33having flexing arms B64C27/35having elastomeric joints B64C27/37having articulated joints B64C27/39with individually articulated blades, i.e. with flapping or drag hinges B64C27/41with flapping hinge or universal joint, common to the blades B64C27/43see-saw type, i.e. two-bladed rotor B64C27/45with a feathering hinge only B64C27/46Blades B64C27/463Blade tips B64C27/467Aerodynamic features B64C27/463 takes precedence B64C27/473Constructional features B64C27/463 takes precedence B64C2027/4733Rotor blades substantially made from particular materials B64C2027/4736from composite materials B64C27/48Root attachment to rotor head B64C27/50Blades foldable to facilitate stowage of aircraft B64C27/51Damping of blade movements B64C27/52Tilting of rotor bodily relative to fuselage of see-saw type construction B64C27/43 B64C27/54Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement B64C27/56characterised by the control initiating means, e.g. manually actuated B64C27/57automatic or condition responsive, e.g. responsive to rotor speed, torque or thrust B64C27/58Transmitting means, e.g. interrelated with initiating means or means acting on blades means acting on blades B64C27/72 B64C27/59mechanical B64C27/605including swash plate, spider or cam mechanisms B64C27/615including flaps mounted on blades B64C27/625including rotating masses or servo rotors B64C27/635specially for controlling lag-lead movements of blades B64C27/64using fluid pressure, e.g. having fluid power amplification B64C27/68using electrical energy, e.g. having electrical power amplification B64C27/72Means acting on blades B64C2027/7205on each blade individually, e.g. individual blade control [IBC] B64C2027/7211without flaps B64C2027/7216using one actuator per blade B64C2027/7222using airfoil deformation B64C2027/7227using blowing slots actuated by piezoelectric actuators B64C2027/7233using higher-harmonic control [HHC] B64C2027/7238by controlling existing swash plate actuators B64C2027/7244by using dedicated actuators B64C2027/725using jets controlled by piezoelectric actuators B64C2027/7255using one or more swash plates B64C2027/7261with flaps B64C2027/7266actuated by actuators B64C2027/7272of the electro-hydraulic type B64C2027/7277of the magnetostrictive type B64C2027/7283of the piezoelectric type B64C2027/7288of the memory shape type B64C2027/7294actuated mechanically, e.g. by means of linkages B64C27/78in association with pitch adjustment of blades of anti-torque rotor B64C27/80for differential adjustment of blade pitch between two or more lifting rotors B64C27/82characterised by the provision of an auxiliary rotor or fluid-jet device for counter-balancing lifting rotor torque or changing direction of rotorcraft B64C2027/8209Electrically driven tail rotors B64C2027/8218wherein the rotor or the jet axis is inclined with respect to the longitudinal horizontal or vertical plane of the helicopter B64C2027/8227comprising more than one rotor B64C2027/8236including pusher propellers B64C2027/8245using air jets B64C2027/8254Shrouded tail rotors, e.g. "Fenestron" fans B64C2027/8263comprising in addition rudders, tails, fins, or the like B64C2027/8272comprising fins, or movable rudders B64C2027/8281comprising horizontal tail planes B64C2027/829comprising a V-tail units B64C29/00Aircraft capable of landing or taking-off vertically, e.g. vertical take-off and landing [VTOL] aircraft rotorcraft B64C27/00 B64C29/0008having its flight directional axis horizontal when grounded B64C29/0016the lift during taking-off being created by free or ducted propellers or by blowers B64C29/0025the propellers being fixed relative to the fuselage B64C29/0033the propellers being tiltable relative to the fuselage B64C29/0041the lift during taking-off being created by jet motors B64C29/005the motors being fixed relative to the fuselage B64C29/0058with vertical jet B64C29/0066with horizontal jet and jet deflector B64C29/0075the motors being tiltable relative to the fuselage B64C29/0083the lift during taking-off being created by several motors of different type B64C29/0091Accessories not provided for elsewhere B64C29/02having its flight directional axis vertical when grounded B64C29/04characterised by jet-reaction propulsion B64C30/00Supersonic-type aircraft B64C31/00Aircraft intended to be sustained without power plantPowered hang-glider-type aircraftMicrolight-type aircraft B64C31/02Gliders, e.g. sailplanes hang-gliders B64C31/028 B64C31/024with auxiliary power plant B64C31/028Hang-glider-type aircraftMicrolight-type aircraft B64C31/0285Safety devices B64C31/032having delta shaped wing B64C31/036having parachute-type wing B64C31/04Man-powered aircraft B64C31/06Kites toy aspects A63H27/08; airborne towed targets, e.g. kites F41J9/10 B64C2031/065of inflatable wing type B64C33/00OrnithoptersGroup B64C33/00 is impacted by reclassification into group B64U10/40.
Groups B64C33/00 and B64U10/40 should be considered in order to perform a complete search. B64C33/02WingsActuating mechanisms therefor B64C33/025the entire wing moving either up or down B64C35/00Flying-boatsSeaplanes B64C35/001with means for increasing stability on the water B64C35/002using adjustable auxiliary floats B64C35/003using auxiliary floats at the wing tips B64C35/005with propellers, rudders or brakes acting in the water B64C35/006with lift generating devices B64C35/007Specific control surfaces therefor B64C35/008Amphibious sea planes B64C37/00Convertible aircraft B64C37/02Flying units formed by separate aircraft towing B64D3/00; aircraft transported by aircraft B64D5/00; air-refuelling B64D39/00 B64C39/00Aircraft not otherwise provided forGroup B64C39/00 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00, B64U30/10-B64U30/16, B64U30/20-B64U30/299, B64U30/30, B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C39/001Flying saucersGroup B64C39/001 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00, B64U30/10-B64U30/16, B64U30/20-B64U30/299, B64U30/30, B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C39/003with wings, paddle wheels, bladed wheels, moving or rotating in relation to the fuselage rotorcraft B64C27/00; ornithopters B64C33/00Group B64C39/003 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00, B64U30/10-B64U30/16, B64U30/20-B64U30/299, B64U30/30, B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C39/005about a horizontal transversal axisGroup B64C39/005 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00, B64U30/10-B64U30/16, B64U30/20-B64U30/299, B64U30/30, B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C39/006about a vertical axisGroup B64C39/006 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00, B64U30/10-B64U30/16, B64U30/20-B64U30/299, B64U30/30, B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C39/008about a longitudinal axisGroup B64C39/008 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00, B64U30/10-B64U30/16, B64U30/20-B64U30/299, B64U30/30, B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C39/02characterised by special useGroup B64C39/02 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00, B64U30/10-B64U30/16, B64U30/20-B64U30/299, B64U30/30, B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C39/022Tethered aircraftGroup B64C39/022 is impacted by reclassification into group B64U10/60.
Groups B64C39/022 and B64U10/60 should be considered in order to perform a complete search. B64C39/024of the remote controlled vehicle type, i.e. RPVGroup B64C39/024 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00, B64U30/10-B64U30/16, B64U30/20-B64U30/299, B64U30/30, B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C39/026for use as personal propulsion unit B64C39/028Micro-sized aircraftGroup B64C39/028 is impacted by reclassification into group B64U10/80.
Groups B64C39/028 and B64U10/80 should be considered in order to perform a complete search. B64C39/029Asymmetrical aircraftGroup B64C39/029 is impacted by reclassification into groups B64U10/00 - B64U10/80, B64U20/00 - B64U20/98, B64U30/00, B64U30/10-B64U30/16, B64U30/20-B64U30/299, B64U30/30, B64U30/40, B64U40/00 - B64U40/20, B64U50/00 - B64U50/39, B64U60/00 - B64U60/70, B64U70/00 - B64U70/99 and B64U80/00 - B64U80/86.
All groups listed in this Warning should be considered in order to perform a complete search. B64C39/04having multiple fuselages or tail booms B64C39/06having disc- or ring-shaped wings B64C39/001 takes precedence B64C39/062having annular wings B64C39/064with radial airflow B64C39/066having channel wings B64C39/068having multiple wings joined at the tips B64C39/08having multiple wings B64C39/10All-wing aircraft B64C39/001 takes precedence B64C2039/105of blended wing body type B64C39/12Canard-type aircraft B64C99/00 B64C99/00Subject matter not provided for in other groups of this subclass B64C2203/00Flying model aircraft, flying toy aircraft B64C2211/00Modular constructions of airplanes or helicopters B64C2220/00Active noise reduction systems B64C2230/00Boundary layer controls B64C2230/02by using acoustic waves generated by transducers B64C2230/04by actively generating fluid flow B64C2230/06by explicitly adjusting fluid flow, e.g. by using valves, variable aperture or slot areas, variable pump action or variable fluid pressure B64C2230/08by influencing fluid flow by means of surface cavities, i.e. net fluid flow is null B64C2230/10by influencing fluid flow by heating using other means than combustion B64C2230/12by using electromagnetic tiles, fluid ionizers, static charges or plasma B64C2230/14achieving noise reductions B64C2230/16by blowing other fluids over the surface than air, e.g. He, H, O₂ or exhaust gases B64C2230/18by using small jets that make the fluid flow oscillate B64C2230/20by passively inducing fluid flow, e.g. by means of a pressure difference between both ends of a slot or duct B64C2230/22by using a surface having multiple apertures of relatively small openings other than slots B64C2230/24by using passive resonance cavities, e.g. without transducers B64C2230/26by using rib lets or hydrophobic surfaces B64C2230/28at propeller or rotor blades