Keywords: Wing profile nomenclature.svg angle of attack is measured relative to freestream velocity measured far ahead not local relative velocity which varies both in direction and magnitude in the vicinity of the airfoil ; The chord line is a straight line going from the leading edge point of minimum radius to the trailing edge; The mean camber line or simply camber line is constituted by the midpoints of all airfoil cross-section segments perpendicular to the chord thumb Different definitions for the thickness Note that the thickness can be defined in several ways see File Airfoil thickness definition svg The so-called British convention is used here 2011-04-19 own created with Inkscape Olivier Cleynen Other versions/Wing profile nomenclature cc-zero Uploaded with UploadWizard Diagrams of airfoil geometry Aeronautical vocabulary Aerodynamics diagrams |