Leading edge refers to which part of an airfoil?

• A. The trailing edge
• B. The wing root
• C. The fuselage nose
• D. The part of an airfoil that meets the airflow first

Answer: (D)

The leading edge is the forwardmost part of an airfoil that first encounters the oncoming air. This edge sets how the air is redirected around the wing, shaping the pressure distribution that produces lift and influencing stall behavior. Air hits the leading edge first, then flows over the upper and lower surfaces toward the trailing edge where the flow re-merges. The wing root is simply where the wing attaches to the fuselage, and the fuselage nose is part of the airplane’s body, not the airfoil’s cross-section. A properly designed leading edge helps keep the flow attached and delays stall, improving overall aerodynamics. The trailing edge is the rear boundary where the air exits the wing.