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	~~{{Short description\|Lift spoilers that can be used as flight control devices}}~~
	~~{{more citations needed\|date=December 2007}}~~

	[[File:RIAS 2014 Tornado 01.jpg\|thumb\|upright=1.35\|Italian Air Force [[Panavia Tornado\|Tornado]] with a spoileron deployed]]		[[File:RIAS 2014 Tornado 01.jpg\|thumb\|upright=1.35\|Italian Air Force [[Panavia Tornado\|Tornado]] with a spoileron deployed]]
	In [[aeronautics]], '''spoilerons''' (also known as '''spoiler ailerons''' or '''roll spoilers''') are [[spoiler (aeronautics)\|spoilers]] that can be used asymmetrically as [[flight control surfaces]] to provide roll control.		In [[aeronautics]], '''spoilerons''' (also known as '''spoiler ailerons''' or '''roll spoilers''') are [[spoiler (aeronautics)\|spoilers]] that can be used asymmetrically as [[flight control surfaces]] to provide roll control.

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{{Short description|Lift spoilers that can be used as flight control devices}}
{{more citations needed|date=December 2007}}

[[File:RIAS 2014 Tornado 01.jpg|thumb|upright=1.35|Italian Air Force [[Panavia Tornado|Tornado]] with a spoileron deployed]]
In [[aeronautics]], '''spoilerons''' (also known as '''spoiler ailerons''' or '''roll spoilers''') are [[spoiler (aeronautics)|spoilers]] that can be used asymmetrically as [[flight control surfaces]] to provide roll control.

==Operation==
Spoilerons [[flight dynamics (fixed-wing aircraft)|roll]] an aircraft by reducing the [[lift (force)|lift]] of the downward-going [[wing]]. Unlike [[ailerons]], spoilers do not increase the lift and drag of the upward-going wing. A raised spoileron increases the drag on the down-going wing where it is deployed, causing the aircraft to [[Flight dynamics (fixed-wing aircraft)|yaw]] in the direction of the turn. Spoilerons can be used to assist ailerons or to replace them entirely, as in the [[Boeing B-52 Stratofortress|B-52G]] which required an extra spoiler segment in place of ailerons present on other B-52 models.<ref>"Airplane Stability and Control" Abzug and Larrabee, Cambridge University Press 2002, {{ISBN|978-0-521-02128-9}}, p.108</ref>

==Purpose==
Spoilerons do not cause [[adverse yaw]], unlike ailerons.

They are used in situations where [[aileron]] action would produce excessive wing twist on a very flexible wing or if wide-span flaps prevent adequate aileron roll control.<ref>"Airplane Stability and Control" Abzug and Larrabee, Cambridge University Press 2002, {{ISBN|978-0-521-02128-9}}, p.69</ref>

They can also be used as spoilers.

The [[Mitsubishi MU-2]] has double-slotted flaps that take-up the full length of the wing, to achieve good [[STOL]] performance. This leaves no room for ailerons, so it uses spoilerons instead.{{citation needed|date=August 2015}}

Spoilerons can be used during a stall, whereas ailerons must not be used in a stall because they will have the opposite to intended effect.

==Disadvantages==
Spoilerons reduce lift, increasing fuel usage. The lift reduction can be a problem in a one-engine-inoperative situation.

==Examples==
[[File:Ejercito del Aire Mirage F.1M.jpg|thumb|[[Dassault Mirage F1]] with spoileron deployed]]
An early use of spoilers augmenting small ailerons, known as ''guide ailerons'', was in the Northrop [[P-61 Black Widow]] night fighter. The spoilers allowed wider-span flaps for a lower landing speed.<ref>"Corky Meyer's Flight Journal", Corwin H. Meyer, Specialty Press 2006, {{ISBN|1-58007-093-0}}, p.127</ref>

The B-52 Stratofortress also had spoilers augmenting small ailerons, known as ''feeler ailerons''. These ailerons provided control forces to the pilot. The B-52G has no ailerons. The spoilers, situated inboard and forward of the trailing edge, are used for lateral control at high speeds to prevent excessive wing twist.<ref>"Airplane Stability and Control", Abzug and Larrabee, Cambridge University Press 2002, {{ISBN|978-0-521-80992-4}}, p.107</ref>

The Mitsubishi Diamond Jet, Beechjet, and Hawker 400 family of business aircraft incorporate full length spoilerons that also double as speed spoilers during flight and landing.{{cn|date=June 2022}}

Another aircraft with full-length double-slotted flaps was the [[Peterson 260SE|Wren 460]]. To go with large aileron deflections at low speeds<ref>{{Cite web |url=https://www.flightglobal.com/pdfarchive/view/1963/1963%20-%200780.html |title=Archived copy |access-date=2016-08-13 |archive-date=2016-08-26 |archive-url=https://web.archive.org/web/20160826082607/https://www.flightglobal.com/pdfarchive/view/1963/1963%20-%200780.html |url-status=dead }}</ref> it had a set of five feathering drag plates ahead of each aileron to overcome adverse aileron yaw and decrease lift on the low wing.<ref>{{Cite web|url=http://www.planeandpilotmag.com/article/wren-460/|title = Wren 460| date=6 February 2016 }}</ref>

[[Boeing]]'s line of jet airliners have flight spoilers which can act as roll spoilers. They are activated automatically when the control wheel is displaced more than 10 degrees.<ref name="B737">{{cite web |title=Boeing B737 NG Flight Controls |url=http://www.737ng.co.uk/B_NG-Flight_Controls.pdf |access-date=22 June 2022}}</ref>

The [[Tupolev Tu-154]] have fast-acting spoilers. They double as spoilerons that assist the ailerons when the pilot commands a high roll rate. These can be observed in operation when the pilot is fighting gusting crosswinds while landing.{{citation needed|date=August 2015}}

==See also==
* [[Flight control surfaces]]
* [[Flaperon]]
* [[Elevon]]

== References ==
{{Reflist}}

{{Aircraft components}}

[[Category:Aircraft controls]]
[[Category:Aircraft wing design]]
[[Category:Aircraft wing components]]

Spoileron - Revision history

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