Rotorcraft Rotors peculiar thereto

BPERFORMING OPERATIONS TRANSPORTING B64Aviation B64CAEROPLANES HELICOPTERS

B64C27/00Rotorcraft Rotors peculiar thereto

B64C27/001Vibration damping devices B64C27/006Safety devices B64C27/007adapted for detection of blade cracks B64C27/008Rotors tracking or balancing devices B64C27/02Gyroplanes B64C27/021Rotor or rotor head construction 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 rotors B64C27/10arranged coaxially B64C27/12Rotor drives B64C27/14Direct drive between power plant and rotor hub B64C27/16Drive of rotors by means B64C27/18the means being jet-reaction apparatus B64C27/20Rotorcraft characterised by having shrouded rotors B64C27/22Compound 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 B64C27/325Circulation-control rotors B64C27/327Retention means relieving the stress from the arm B64C27/33having flexing arms B64C27/35having elastomeric joints B64C27/37having articulated joints B64C27/39with individually articulated blades B64C27/41with flapping or universal joint, common to the blades B64C27/43see-saw type B64C27/45with a feathering hinge only B64C27/46Blades B64C27/463Blade tips B64C27/467Aerodynamic features B64C27/473Constructional features 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 B64C27/54Mechanisms for controlling blade adjustment or movement relative to rotor head B64C27/56Initiating means B64C27/57automatic or condition responsive B64C27/58Transmitting means 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 B64C27/68using electrical energy B64C27/72Means acting on blades 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