What is one purpose of slats creating an air gap?

• A. Alter camber
• B. Increase wing area
• C. Increase drag
• D. Create air gap to smooth air flow

Answer: (D)

Slats create an air gap to energize the airflow over the leading edge. The slot between the slat and the wing lets higher-energy air flow through to the upper surface, re-energizing the boundary layer and keeping the flow attached at higher angles of attack. This smooths the airflow, increases lift at low speeds, and delays stall. It’s not about changing camber or wing area, though those can be affected indirectly; the primary purpose of the gap is improved flow control, even if a bit more drag is a side effect.