A restrictor lock is disclosed for locking in the maximum velocity of a traveling unit. The system includes a torsional hinged device that oscillates at a resonant frequency, and the resonant frequency of the device drifts or varies with temperature. A controller and a wind turbine are also disclosed. Movable shutters on each side of the foil structure control the amount of current to the turbines and sheltering them from storm and debris. A notch in the tip of the slide assists in preventing rotation of a connector head having opposing locking pins when one of the pins is received in a recess at the back of the socket cavity. The system includes a service application having the capability of providing a variety of service functions to permit data to be captured regarding the status of the adapter, and a communication structure to permit data to be transmitted to and received from the service application.