a rotor system for rotorcraft comprised of counter-rotating rotor blades for rotorcraft, pitch control linkages for rotorcraft to adjust blade pitch angles of the rotor system, and a duct with rotating and stationary rings for rotorcraft; a rotor system for helicopters comprised of counter-rotating rotor blades for helicopters, pitch control linkages for helicopters to adjust blade pitch angles of the rotor system, and a duct with rotating and stationary rings for helicopters; a rotor system for aircraft of a helicopter-airplane hybrid configuration comprised of counter-rotating rotor blades for hybrid aircraft, pitch control linkages for hybrid aircraft to adjust blade pitch angles of the rotor system, and a duct with rotating and stationary rings for hybrid aircraft

'adjust':21,59,106 'aircraft':81,98,104,124 'airplan':86 'angl':24,62,109 'blade':12,22,50,60,95,107 'compris':6,44,89 'configur':88 'control':16,54,100 'counter':9,47,92 'counter-rot':8,46,91 'duct':31,69,116 'helicopt':43,52,57,76,85 'helicopter-airplan':84 'hybrid':87,97,103,123 'linkag':17,55,101 'pitch':15,23,53,61,99,108 'ring':36,74,121 'rotat':10,33,48,71,93,118 'rotor':2,11,27,40,49,65,78,94,112 'rotorcraft':5,14,19,38 'stationari':35,73,120 'system':3,28,41,66,79,113

TORUS ROTOR SYSTEM

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