What flight control system was developed to enhance aircraft maneuverability in the mid-20th century?

The flight control system developed to enhance aircraft maneuverability in the mid-20th century is stability augmentation. This type of system is designed to improve the stability and control of the aircraft, especially during dynamic maneuvers. Stability augmentation systems work by automatically detecting deviations from a desired flight path and making adjustments to the aircraft's control surfaces to bring it back to that path. This technology significantly improves the handling characteristics of aircraft, giving pilots better responsiveness and control during various flying conditions.

In contrast, open loop systems do not make adjustments based on feedback, which limits their effectiveness in enhancing maneuverability. Closed loop systems rely on feedback to control performance but are more general and do not specifically focus on the stabilization of maneuverability. Active control systems can also be involved in improving handling characteristics, but stability augmentation is specifically geared towards enhancing stability and control, especially in dynamic situations.