What is the primary function of a split flap on an aircraft wing?

The primary function of a split flap on an aircraft wing is to increase the lift generated by the wing when deployed. Split flaps work by increasing the effective camber of the wing, which allows for greater lift at lower speeds, particularly during takeoff and landing phases. When a split flap is extended, part of it hangs down from the trailing edge of the wing, disrupting the airflow and increasing the angle of attack. This results in a significant increase in lift while also creating additional drag.

While increased drag is a consequence of deploying split flaps, the primary purpose of using them is to enhance lift capabilities. This aids pilots in maintaining controlled flight at slower speeds and during critical phases of operation, such as takeoff and landing, where lift is crucial for safe operation. The deployment of split flaps also contributes to the aircraft's ability to decelerate more effectively during the landing phase.