What is the Mean Aerodynamic Chord (MAC)?

The Mean Aerodynamic Chord (MAC) is the average width of the wing, calculated based on the varying chord length across the span of the wing. It represents a crucial aerodynamic characteristic, as it significantly influences the wing's aerodynamic properties, such as lift and drag. The MAC is essential for understanding the aircraft's center of gravity and stability, as it helps in determining how the lift generated by the wing is distributed along its span.

This average chord value is particularly useful for calculations involving the aircraft's performance, as it simplifies complex wing shapes into a single representative measurement. This allows pilots and engineers to make accurate assessments when analyzing flight characteristics and stability.

The other options do not capture the concept of mean aerodynamic chord accurately. The distance from the wingtip to the fuselage refers to the wingspan and does not represent the aerodynamic properties associated with the chord. The angle at which the wing is mounted relates to the dihedral angle or incidence angle, which is separate from the measurement of chord. The total surface area of the wing describes the overall size of the wing but does not convey the average chord length, which is specific to the aerodynamic characteristics critical for flight dynamics.