Aero-Terms!

Aero-Terms are designed to be a daily reminder of the terms, names, acronyms and explanations of the unique language that populates the aviation world. Aerospace, sport aviation, fixed wing, helo, you name it... it's all fair game.

Aero-Terms should serve as a quick but intriguing reminder of the terms you may use every day, or an introduction to an aspects of the Aero-World you may not yet be familiar with. ANN also encourages readers to go beyond the FMI link, and further research any intriguing terms.

Suggestions for future Aero-Terms are ALWAYS welcome, as are additions or discussion of the explanations given for each Aero-Term.

Frise-Type Aileron

An Aileron having the nose portion projecting ahead of the hinge line. When the trailing edge of the aileron moves up, the nose projects below the wing s lower surface and produces some parasite drag, decreasing the amount of adverse yaw.

Engineer Leslie George Frise (1897-1979) developed an aileron shape which is often used due to its ability to counteract adverse yaw. The Frise aileron is pivoted at about its 20% chord line and near its bottom surface. The leading edge of the aileron is bluntly rounded so that when the aileron is deflected up (to make its wing go down), the leading edge of the aileron dips into the airflow beneath the wing and adds significant drag to that wing. The resulting drag causes the aircraft to pivot (turn) in the desired direction.

FMI:http://aviationglossary.com/frise-type-aileron