AS9120B, ISO 9001:2015, and FAA AC 0056B ACCREDITED

5 Important Aerodynamic Facts About Flaps

Flaps are an essential element of many aircraft wings that play a crucial role in enhancing flight performance and safety. As flaps are used to manipulate the flow of air around wings for optimal control during flight operations, having a general understanding of them and their use can be crucial for any current or prospective pilot. In this article, we will discuss five facts about flaps, allowing you to gain insight on these pivotal flight surfaces.

1. Flaps Reduce Stall Speeds

One of the primary benefits of flaps is their ability to lower an aircraft's stall speed. Stall speed refers to the minimum speed at which an aircraft can maintain level flight, and flying under this speed can cause the aircraft to lose lift. By extending the flaps out into the air as they pivot upward from the wing, the wing's effective camber increases, resulting in more lift and reduced stall speed. This is especially important during takeoff and landing, where maintaining control at lower speeds is critical.

2. Flaps Extend and Increase the Wing’s Surface Area

When flaps extend outward, they effectively increase the wing's total surface area. By increasing surface areas, flaps allow the aircraft to generate more lift at a given angle-of-attack. This coincides with lowering stall speeds, though there are other times in which a pilot may wish to have more lift production outside of landing and takeoff.

3. Flaps Create Drag

While flaps provide valuable lift, they also create significant drag. Drag is the force that opposes an aircraft's forward motion, slowing it down. When flaps are deployed, they increase the surface area exposed to the oncoming airflow, resulting in increased drag. This drag helps the aircraft slow down, which is desirable during landing where a particular angle-of-attack is necessary for safety. However, it also means that more engine power is required to overcome the additional drag created by the extended flaps.

4. Flap Operation Is Typically Controlled by a Flap Wheel

The deployment and retraction of flaps is usually made possible using a flap wheel located in the aircraft's cockpit. A pilot can adjust the position of the flaps using the flap wheel, allowing for precise control of the wing's configuration whenever necessary. Different flap settings are available, such as fully retracted, partially extended, and fully extended configurations. The choice of setting will depend on the aircraft's phase of flight and desired aerodynamic performance. In some instances, flaps may also be automatically operated if the aircraft has automatic flight systems.

5. Flap Track Fairings Improve Aerodynamics

Flap track fairings are aerodynamic covers that streamline the mechanism that controls the movement of the flaps. These fairings help reduce drag by smoothing out the airflow over the flap tracks. By reducing drag, flap track fairings contribute to improved fuel efficiency and overall performance. Additionally, they enhance the aircraft's appearance by providing a sleek and streamlined surface.


Understanding the aerodynamic principles behind flaps and their use is essential for pilots and aviation enthusiasts. Like many aviation parts that are subjected to the forces and stresses of flight, flaps and their related components will face wear and tear over time, necessitating the execution of proper inspection and maintenance procedures. If you find yourself in need of various flap parts for maintenance or repair operations, look no further than Procurement Domain and our unrivaled inventory of items.

Procurement Domain is a premier purchasing platform belonging to the ASAP Semiconductor family of websites, and we present customers access to an expansive inventory replete with over 6 billion new, used, obsolete, and hard-to-find parts that cater to a diverse set of industries and applications. Everything we offer is ready for purchase with highly competitive pricing and rapid lead times, and you can always utilize our online RFQ service to request quotes for your comparisons. Once we receive and review a completed form, a member of our staff will contact you in 15 minutes or less to present a tailored solution that closely caters to your individual needs and restrictions alike. See how Procurement Domain can serve you today when you kick off the procurement process with our industry experts.


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