The smallest aircraft I know of that has a yaw damper is the Pilatus PC-12.
From an engineering standpoint, how hard is it to make a light-weight solution for a light single engine plane?
The system in mind would also automate the corrections for all left turn tendencies, and coordinate the turns.
The reasoning for it is a no-hands-and-feet autopilot flying, plus the other benefits in takeoff rolls, etc.
The components I'd imagine would be needed:
- Slip indicator digital output;
- IAS digital output;
- Logic board;
- Rudder control-tab powered by an electric actuator.