Final answer:
SAS enhances stability at airspeeds greater than 50 knots by reducing unwanted movements and improving efficiency through the use of autopilot systems and wingtip devices.
Step-by-step explanation:
In aerodynamics, SAS stands for Stability Augmentation System. At airspeeds greater than 50 knots, SAS enhances the stability of an aircraft. It helps to keep the aircraft flying in a controlled and balanced manner by reducing unwanted movements, such as oscillations or sudden changes in altitude.
One example of SAS enhancing stability is the use of an autopilot system. Autopilot can adjust the control surfaces of an aircraft to maintain a desired heading, altitude, or airspeed. By doing so, it keeps the aircraft stable and reduces the need for manual control inputs from the pilot.
Another example is the use of wingtip devices, such as winglets. Winglets reduce the drag and improve the efficiency of the aircraft at higher airspeeds. This helps in maintaining stability and maneuverability at those speeds.