Which type of drag is generated as a byproduct of lift?

Induced drag is the type of drag that is generated as a byproduct of lift. When an aircraft generates lift, particularly at lower speeds or higher angles of attack, a vortex forms at the wingtips due to the pressure difference between the upper and lower surfaces of the wings. These vortices increase overall lift but also create induced drag, which acts in the opposite direction of the aircraft's flight path. Essentially, as lift increases, so does induced drag, making it a crucial consideration during flight, especially during takeoff and landing phases when lift demand is higher.

Parasitic drag, frictional drag, and propulsive drag do not arise from the lift generation process. Parasitic drag is related to the aircraft's shape and its resistance to airflow, while frictional drag pertains to the surface roughness and the interaction of the air with the aircraft's skin. Propulsive drag relates to the forces generated by the engines, which is separate from the aerodynamic effects of lift. Understanding these distinctions is important for efficient flight operations and design considerations.