What feature is designed to reduce drag and improve performance in nonretractable landing gear?

The feature that is designed to reduce drag and improve performance in nonretractable landing gear is fairings over the top half. Fairings are streamlined coverings that help to smooth out the airflow around the landing gear, thereby minimizing turbulence and reducing drag. This improvement in aerodynamics allows the aircraft to achieve better performance, particularly during flight when every bit of drag reduction can benefit fuel efficiency and speed.

In aircraft with nonretractable landing gear, fairings play a crucial role in enhancing performance since the landing gear remains exposed during flight. By mitigating drag that would otherwise impact the aircraft's performance, fairings contribute significantly to overall efficiency and handling. Deploying fairings optimally can lead to a notable improvement in the aircraft's aerodynamic profile.