What function does a stall strip serve?

The function of a stall strip is to ensure that the root area of the wing begins to stall at a lower angle of attack compared to the wingtip. This is crucial for maintaining control of the aircraft during flight, particularly during high-angle-of-attack maneuvers. By causing the stall to initiate at the root, the stall strip allows the pilot to retain aileron effectiveness, which helps in preventing an uncontrollable roll that could occur if the wingtips stalled first. This design promotes a gradual stall of the wing and enhances overall aircraft stability and control during critical phases of flight.

While a stall strip doesn’t prevent lift from being generated, enhance lift, or increase the stall angle of attack at the wingtip, its primary role is to manage the airflow and stall characteristics across the wing's span effectively, ensuring safer handling of the aircraft.