Which of the following devices is not considered a high drag device?

Winglets are not considered high drag devices because they are designed primarily to enhance the aerodynamic efficiency of an aircraft. Their primary function is to reduce induced drag, which is a type of drag that occurs due to the lift generated by the wings. By smoothing airflow around the wingtips, winglets help to minimize the formation of vortices, which are swirling air patterns that contribute to drag.

In contrast, devices such as flaps, spoilers, and landing gear are typically categorized as high drag devices because they increase drag when deployed. Flaps are used to increase lift at lower speeds, particularly during takeoff and landing, but they also introduce significant drag. Spoilers actively disrupt airflow over the wing to decrease lift and increase drag, which can be beneficial for descending. Landing gear creates drag when extended, especially at cruising speeds. Each of these components plays a specific role in aircraft performance but contributes to higher drag under certain operating conditions, while winglets are integral to improving aerodynamic efficiency.