What does the term "slotted flaps" refer to?

The term "slotted flaps" refers to flaps that extend outwards on the wing and are designed to decrease stall speed. This function is crucial for enhancing the aerodynamic performance of an aircraft during landing and takeoff phases.

When slotted flaps are deployed, a slot is created between the flap and the wing's trailing edge. This slot allows high-energy air from the lower surface of the wing to flow through and energize the airflow over the upper surface of the wing, delaying airflow separation. By maintaining more controlled airflow, slotted flaps enable the aircraft to fly at lower speeds without risking a stall, which is particularly beneficial during critical phases of flight when lower speeds are necessary.

This helps pilots achieve steeper descents and slower approaches, improving safety and control. The design of slotted flaps enhances lift at lower speeds, making them a popular choice in various aircraft, especially in those intended for short takeoff and landing (STOL) operations.