Disconnecting a Rotor

A rotorcraft, comprising:

• a body;
• a power train coupled to the body and comprising a power source and a drive shaft coupled to the power source;
• a main rotor system coupled to the power train, the main rotor system comprising at least one main rotor blade;
• a secondary rotor system coupled to the power train, the secondary rotor system comprising at least one secondary rotor blade;
• a clutch coupled between the secondary rotor system and the power train, the clutch operable to disengage the secondary rotor system from the power train during operation of the power train;
• and
• a clutch control system in communication with the clutch and comprising:
• a rotorcraft condition sensor operable to sense an operating condition of the rotorcraft;
• and
• a control unit operable to prevent the clutch from disengaging the secondary rotor system from the power train if the operating condition of the rotorcraft fails to satisfy a predetermined criterion.