Radio failure protection for R/C models

Model cars, boats and airplanes may go out of control, causing serious danger and damage when a failure occurs in the radio control system. This circuit helps to prevent such mishaps by taking over the control of, for example, the accelerator; brake servo in a model car when the radio signal fails. The servo is then set to a predetermined position, for exampie, brake hard. The circuit may be inserted in any servo link.