How does the angle of incidence differ from the Angle of Attack?

The angle of incidence is defined as the angle between the chord line of the wing and the longitudinal datum of the aircraft. This angle is a fixed geometrical measurement that reflects how the wing is mounted in relation to the fuselage and does not change during flight. It is an important aerodynamic parameter because it influences the overall performance characteristics of the aircraft, particularly at various stages of flight.

In contrast, the angle of attack is the dynamic angle between the chord line of the wing and the oncoming airflow. Unlike angle of incidence, angle of attack can vary during flight as the pilot changes the aircraft's pitch or during changes in the aircraft's attitude in relation to the air.

Understanding this distinction is crucial for pilots, as managing the angle of attack is vital for ensuring optimal lift generation and avoiding conditions such as stalling.