Which term describes surfaces designed to generate lift in flight?

• A. Airfoils
• B. Wings
• C. Fuselage
• D. Propellers

Answer: (A)

Lift arises when a curved surface interacts with moving air. An airfoil is the shape used to generate lift in flight. Its curved upper surface and flatter lower surface, combined with the angle at which it meets the oncoming air, cause air to move faster over the top and slower beneath, creating lower pressure on top and higher pressure on the bottom. This pressure difference pushes the surface upward. While wings are the lifting surfaces of an aircraft, the term for the aerodynamic shape that produces lift is airfoil. The fuselage mainly provides structure and houses occupants, and propellers produce thrust rather than lift.