A rotorcraft comprising: a fuselage; a tailboom extending from the fuselage, the tailboom having an aft portion; and a yaw control system comprising: a shroud coupled to the aft portion of the tailboom and forming one or more ducts; one or more tail rotors (312, 314, 316, 318) disposed in the one or more ducts, the one or more tail rotors having one or more operating parameters, the one or more tail rotors rotatable in a first rotational direction to provide anti-torque thrust and a second, opposite rotational direction to provide pro-torque thrust, the one or more tail rotors reversing rotational direction at a motor reversal set point; and a flight control computer implementing a quiet mode controller, the quiet mode controller comprising: a noise monitoring module configured to monitor one or more flight parameters of the rotorcraft; and a quiet mode command module configured to selectively switch the one or more tail rotors to a quiet mode based on the one or more flight parameters; wherein, the quiet mode command module is configured to modify the one or more operating parameters of the one or more tail rotors in the quiet mode to reduce noise emitted by the rotorcraft; and characterised in that: the quiet mode command module comprises a motor reversal set point regulator to modify the motor reversal set point of the one or more tail rotors in the quiet mode. a fuselage; a tailboom extending from the fuselage, the tailboom having an aft portion; and a yaw control system comprising: a shroud coupled to the aft portion of the tailboom and forming one or more ducts; one or more tail rotors (312, 314, 316, 318) disposed in the one or more ducts, the one or more tail rotors having one or more operating parameters, the one or more tail rotors rotatable in a first rotational direction to provide anti-torque thrust and a second, opposite rotational direction to provide pro-torque thrust, the one or more tail rotors reversing rotational direction at a motor reversal set point; and a flight control computer implementing a quiet mode controller, the quiet mode controller comprising: a noise monitoring module configured to monitor one or more flight parameters of the rotorcraft; and a quiet mode command module configured to selectively switch the one or more tail rotors to a quiet mode based on the one or more flight parameters; wherein, the quiet mode command module is configured to modify the one or more operating parameters of the one or more tail rotors in the quiet mode to reduce noise emitted by the rotorcraft; and characterised in that: the quiet mode command module comprises a motor reversal set point regulator to modify the motor reversal set point of the one or more tail rotors in the quiet mode. a shroud coupled to the aft portion of the tailboom and forming one or more ducts; one or more tail rotors (312, 314, 316, 318) disposed in the one or more ducts, the one or more tail rotors having one or more operating parameters, the one or more tail rotors rotatable in a first rotational direction to provide anti-torque thrust and a second, opposite rotational direction to provide pro-torque thrust, the one or more tail rotors reversing rotational direction at a motor reversal set point; and a flight control computer implementing a quiet mode controller, the quiet mode controller comprising: a noise monitoring module configured to monitor one or more flight parameters of the rotorcraft; and a quiet mode command module configured to selectively switch the one or more tail rotors to a quiet mode based on the one or more flight parameters; wherein, the quiet mode command module is configured to modify the one or more operating parameters of the one or more tail rotors in the quiet mode to reduce noise emitted by the rotorcraft; and characterised in that: a noise monitoring module configured to monitor one or more flight parameters of the rotorcraft; and a quiet mode command module configured to selectively switch the one or more tail rotors to a quiet mode based on the one or more flight parameters; wherein, the quiet mode command module is configured to modify the one or more operating parameters of the one or more tail rotors in the quiet mode to reduce noise emitted by the rotorcraft; and characterised in that: the quiet mode command module comprises a motor reversal set point regulator to modify the motor reversal set point of the one or more tail rotors in the quiet mode.