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FEF ISN'T ONLY DANISH; J00 WILL LEARN TO FEAR THE VANDAL GOD! AND JUST LIKE THE DANISH WIKI, YOU WILL FAIL EPICALLY AT BANNING ME, LOLOLOLOLOLOL

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+FEF ISN'T ONLY DANISH; J00 WILL LEARN TO FEAR THE VANDAL GOD! AND JUST LIKE THE DANISH WIKI, YOU WILL FAIL EPICALLY AT BANNING ME, LOLOLOLOLOLOL
-{{otheruses}}
-[[Image:Spliced feather 0002.jpg|thumb|200px|Arrow fletches are a type of fin.]]A '''fin''' is a surface used to produce [[lift (force)|lift]] and [[thrust]] or to steer while traveling in [[water]], air, or other  [[fluid]] media. The first use of the word was for [[Fish anatomy#Fins|the limbs]] of [[fish]], but has been extended to include other animal limbs and man-made devices.
-The foremost use of fins is to ensure the directional stability of an object moving through a fluid such as water or air and may be seen in the use of [[fletching]] on [[arrow (weapon)|arrow]]s and fins at the rear of some [[missile]]s, [[rocket]]s, self-propelled [[torpedo]]es, and  [[KE-penetrator|kinetic energy penetrators]].  They are typically "planar" (shaped like small wings), although [[grid fin]]s are sometimes used in specialized cases.
-Moving fins may be used to propel an object through lateral thrust (see [[mechanics]]).
-Examples of fin use:
-* [[Propeller]]s usually have a number of fins that work to translate torquing force to lateral thrust, thus propelling a [[ship]]. These are also called blades. In the case of high power application it is important to avoid [[cavitation]], caused by excessive negative pressure, as this can cause noise, a loss of power, and damage to the propeller.
-* For [[Scuba diving|scuba]] divers' fins, see [[swimfin]].
-* In [[surfing]], a [[skeg]] is a stabilizing fin located at the rear of the [[surfboard]]. A skeg has the effect of keeping the board moving forward in a controlled manner. The [[surfboard fin]] has undergone numerous phases of development.
-* Constructions of the same purpose as fins (producing thrust, but working in gaseous media) instead are usually called [[wing]]s or [[Stabilizer (aircraft)|stabilizer]]s with [[aerodynamics]] as the governing science. The exception to this is the vertical surface of an aircraft to which the [[rudder]] is attached - this is usually called the fin, tail fin (UK), or [[vertical stabilizer]] (US).
-* the fin of a rocket uses pressure on both sides of the fin to create a more stable flight in a rocket
-==References==
-{{Unreferenced|date=August 2008}}
-[[Category:Animal anatomy]]
-[[Category:Nautical terms]]
-[[Category:Aircraft components]]
-{{water-stub}}
-[[de:Finne (Wassersport)]]
-[[es:aleta]]
-[[fr:Nageoire]]
-[[io:Floso]]
-[[lt:Pelekas]]
-[[nl:Vin]]
-[[pt:barbatana]]
-[[uk:Плавець]]