ATPL Intensive Program (IP) Practice Exam

Induced drag is a type of aerodynamic drag that occurs when lift is generated. It is related to the formation of vortices at the wingtips, which are a byproduct of lift generation. The relationship between induced drag and the lift coefficient is particularly significant because as the lift coefficient increases, the amount of lift produced by an airfoil also increases, which in turn leads to a greater strength of the tip vortices.

When the lift coefficient goes up, the aircraft has to generate more lift to maintain flight, which results in more intense wingtip vortices. These vortices create additional induced drag because they affect the airflow over the wing and cause a loss in efficient flow, leading to more energy being required to maintain that lift. Therefore, as the lift coefficient increases, the induced drag will also increase.

This relationship between lift coefficient and induced drag is crucial for understanding how to optimize aircraft performance, especially during takeoff and climbing phases when high lift coefficients are often required.