What happens to the stall angle of an airplane wing as altitude increases?

The stall angle of an airplane wing is primarily determined by the airfoil shape and the aerodynamic characteristics of the wing, which remain consistent regardless of altitude. As an aircraft climbs to higher altitudes, the surrounding air becomes less dense, resulting in a decrease in the pressure acting on the wing. However, the stall angle itself—defined as the angle of attack at which airflow begins to separate from the wing's upper surface—does not change with altitude.

While the stall speed of an aircraft will increase at higher altitudes due to lower air density, the actual angle at which the stall occurs remains constant. Thus, the stall angle is not dependent on factors such as altitude, making it crucial for pilots to understand that while their aircraft's performance characteristics may change with altitude, the inherent aerodynamic properties of their wings remain stable.

The responses referring to variations in altitude or aircraft weight leading to changes in stall angle focus on aspects that influence the aircraft's performance differently than the stall angle itself. Therefore, the idea that the stall angle remains the same regardless of altitude is correct and reflects the fundamental aerodynamic properties of the wing.