■ 서 론
An airfoil (in American English) or aerofoil (in British English) is the shape of a wing, blade (of a propeller, rotor, or turbine), or sail (as seen in cross-section).
An airfoil-shaped body moved through a fluid produces an aerodynamic force. The component of this force perpendicular to the direction of motion is called lift. The component parallel to the direction of motion is called drag. Subsonic flight airfoils have a characteristic shape with a rounded leading edge, followed by a sharp trailing edge, often with a symmetric curvature of upper and lower surfaces. Foils of similar function designed with water as the working fluid are called hydrofoils.
The lift on an airfoil is primarily the result of its angle of attack and shape. When oriented at a suitable angle, the airfoil deflects the oncoming air (for fixed-wing aircraft, a downward force), resulting in a force on the airfoil in the direction opposite to the deflection. This force is known as aerodynamic force and can be resolved into two components: lift and drag.
저자 정진화, 김영수 외 3명
『AVIATION THCHNICAL ENGLISH』, 오토테트, P.7~41
구글 자료실, FAA-8083-30_Ch03.PDF file:///C:/Users/L/Desktop/FAA/FAA%20general/FAA-8083-30_Ch03.pdf
AOA 사진 https://www.google.co.kr/imgres?imgurl=https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fthumb%2F6%2F6d%2FAngle_of_attack.svg%2F2000px-Angle_of_attack.svg.png&imgrefurl=https%3A%2F%2Fcommons.wikimedia.org%2Fwiki%2FFile%3AAngle_of_attack.svg&docid=jVgjr5hEa11c7M&tbnid=StEeZM4EuMgjeM%3A&w=2000&h=990&bih=960&biw=1920&ved=0ahUKEwje4_WwoNrPAhXItpQKHTpHBKUQMwgkKAgwCA&iact=mrc&uact=8
NACA number http://digital.library.unt.edu/ark:/67531/metadc56889/m1/25/