The trailing edge of an airfoil is best described as which part of the wing?

• A. Trailing edge
• B. Leading edge
• C. Centerline
• D. Camber line

Answer: (A)

The main idea is that each airfoil cross-section has a front and a rear boundary. The trailing edge is the rear boundary of the wing, where the upper and lower surfaces meet at the back of the cross-section. The leading edge is the front boundary where the airflow first meets the wing. The centerline is just an imaginary reference line, not a physical edge. The camber line is a theoretical line between the upper and lower surfaces that describes camber, not an actual edge. Since the question is asking which part is the trailing edge, it corresponds to the rear boundary of the wing.