How does an aircraft's speed affect its stall angle?

The correct understanding of how an aircraft's speed influences its stall angle lies in recognizing that the stall angle is essentially a characteristic of the airfoil's design and does not change with variations in speed. The stall angle, or critical angle of attack, is the angle at which airflow separates from the wing, leading to a loss of lift regardless of the speed at which the aircraft is traveling.

At higher speeds, though the air density and dynamic pressure impacting the aircraft change, these factors do not alter the geometry of the wing or the inherent flow characteristics that determine the stall angle. Instead, an aircraft can operate at higher angles of attack at increased speeds without initially stalling, but the stall angle itself remains constant.

Thus, it is accurate to state that the stall angle remains constant regardless of speed, as it is a function of the airfoil's shape and not the aircraft’s speed or weight. Understanding this principle is critical for pilots to maintain safe flying practices, particularly during maneuvers at varying speeds.