Steve escapements are early control surface actuators before electric servos were commonplace. The clockwork like mechanism was driven by a wound up rubberband and were operated by a relay on the single channel Rx that sent a current to an electro magnet on the escapement which released the esscapement to rotate to a predetermined point of rotation. one blip and hold was full right, two blips and hold was full left, sometimes three blips and hold was up elevator or low throttle. Release caused a return to neautrals. The rudder operated from a torque rod and not a pushrod.

John

J