Editing Wing (section)

{{Short description|Appendage used for flight}}
{{about|the term in aerodynamics|other uses|Wing (disambiguation)|and|Wings (disambiguation)}}
[[File:wing.two.arp.600pix.jpg|thumb|right|Two different planforms are shown with a [[swept wing]] [[KC-10 Extender]] (top) [[air-to-air refueling|refuel]]ing a diamond-like delta wing [[F-22 Raptor]]]]

A '''wing''' is a type of [[fin]] that produces both [[Lift (force)|lift]] and drag while moving through air. Wings are defined by two shape characteristics, an [[airfoil]] section and a [[planform (aeronautics)|planform]]. Wing efficiency is expressed as [[lift-to-drag ratio]], which compares the benefit of lift with the air resistance of a given wing shape, as it flies. [[Aerodynamics]] is the study of wing performance in air.

Equivalent [[Foil (fluid mechanics)|foils]] that move through water are found on [[Hydrofoil|hydrofoil power vessels]] and [[Sailing hydrofoil|foiling sailboats]] that lift out of the water at speed and on [[submarine]]s that use [[diving plane]]s to point the boat upwards or downwards, while running submerged. [[Hydrodynamics]] is the study of foil performance in water.