Increasing the Angle of Attack (AOA) of a wing is directly proportional to the amount of lift produced until what occurs?

Increasing the Angle of Attack (AOA) of a wing enhances the lift generated by the wing due to the increased airflow being deflected downwards, which generates a corresponding upward lift force as per Bernoulli’s principle and Newton’s third law of motion. However, this relationship is only valid up to a certain point.

As the AOA continues to increase, it eventually reaches a critical threshold known as the stall angle. Beyond this point, the airflow over the wing begins to separate from the wing's upper surface, leading to a significant decrease in lift. This phenomenon is known as wing stall. At this stage, instead of increasing lift, further increases in AOA result in turbulence and a loss of the smooth airflow, drastically diminishing the aerodynamic efficiency of the wing and causing a substantial loss of lift.

The other options, while they can relate to varying flight conditions, do not fundamentally alter the relationship between AOA and lift in the same direct manner that the stall condition does. For instance, while drag may increase with higher AOA, it does not describe the point at which lift production ceases effectively. Therefore, the correct answer pertains to the critical angle where lift production is adversely affected, marking the onset of a stall.