TORUS ROTOR SYSTEM

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