Nacelle: Difference between revisions
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{{short description|Part of an aircraft}} |
{{short description|Part of an aircraft, encasing the engines}} |
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{{About|aircraft nacelles|wind turbine nacelles|Nacelle (wind turbine)}} |
{{About|aircraft nacelles|wind turbine nacelles|Nacelle (wind turbine)}} |
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[[File:Boeing 707 engineviewedit.jpg|thumb|Engines in nacelles on a [[Boeing 707]] ]] |
[[File:Boeing 707 engineviewedit.jpg|thumb|Engines in nacelles on a [[Boeing 707]] ]] |
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A '''nacelle''' ({{IPAc-en|n|ə|ˈ|s|ɛ|l}} {{Respell|nə|SEL}}) is a |
A '''nacelle''' ({{IPAc-en|n|ə|ˈ|s|ɛ|l}} {{Respell|nə|SEL}}) is a streamlined container for [[aircraft]] parts such as [[Aircraft engine|engines]], fuel or equipment.<ref>The Cambridge Aerospace Dictionary, Bill Gunston,{{ISBN|0 511 33833 3}}</ref> When attached entirely outside the airframe, it is sometimes called a pod, in which case it is attached with a [[Hardpoint#Pylon|pylon]] or strut and the engine is known as a [[podded engine]].<ref>{{cite book |title=A Dictionary of Aviation |first=David W. |last=Wragg |isbn=9780850451634 |edition=first |publisher=Osprey |year=1973 |page=199}}</ref> In some cases—for instance in the typical "[[Farman Aviation Works|Farman]]" type [[Pusher configuration|"pusher" aircraft]], or the [[World War II]]-era [[P-38 Lightning]] or [[SAAB J21]]—an aircraft cockpit may also be housed in a nacelle, rather than in a conventional [[fuselage]]. |
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==Etymology== |
==Etymology== |
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Like many aviation terms, the word comes from [[French language|French]], in this case from a word for a small boat.<ref>{{cite web|url=http://www.etymonline.com/index.php?term=nacelle|title=Online Etymology Dictionary|access-date=5 December 2013}}</ref> |
Like many [[aviation]] terms, the word comes from [[French language|French]], in this case from a word for a small boat.<ref>{{cite web|url=http://www.etymonline.com/index.php?term=nacelle|title=Online Etymology Dictionary|access-date=5 December 2013}}</ref> |
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== Development == |
== Development == |
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[[file:Arado Ar 234V6 and Ar 234V8 front-view silhouettes.png|thumb|The development of the [[Arado Ar 234]], merging the four nacelles into two]] |
[[file:Arado Ar 234V6 and Ar 234V8 front-view silhouettes.png|thumb|The development of the [[Arado Ar 234]], merging the four nacelles into two]] |
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The [[Arado Ar 234]] was one of the first operational jet aircraft with engines mounted in nacelles. During its development, the four |
The [[Arado Ar 234]] was one of the first operational jet aircraft with engines mounted in nacelles. During its development, the four engines had four distinct nacelles. They once had their own landing gear wheel, but they were later combined to two nacelles with two engines each. |
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Around 2010, [[General Electric]] and [[NASA]] have developed nacelles with chevron-shaped trailing edges to reduce the engine noise of commercial aircraft, using an experimental [[Boeing 777]] as a test platform.<ref>{{cite web | title = NASA Helps Create a More Silent Night | url = https://www.nasa.gov/topics/aeronautics/features/bridges_chevron_events_prt.htm | publisher = [[National Aeronautics and Space Administration]] | date = December 13, 2010 | access-date = September 21, 2019 | archive-date = January 18, 2017 | archive-url = https://web.archive.org/web/20170118110405/https://www.nasa.gov/topics/aeronautics/features/bridges_chevron_events_prt.htm | url-status = dead }}</ref> |
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==Applications== |
==Applications== |
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===Other uses=== |
===Other uses=== |
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*[[Edward Turner (motorcycle designer)|Edward Turner]] used the term to describe his styling device introduced in 1949 to tidy the area around the headlamp and instrument panel of his [[Triumph Speed Twin]], [[Triumph Thunderbird|Thunderbird]] and [[Triumph Tiger 100|Tiger 100]] motorcycles. This styling device was much copied within the British industry thereafter, although Czech motorcycle manufacturer [[Česká Zbrojovka Strakonice]] was using it beforehand. Indeed, the [[Royal Enfield Bullet]] still retains its version, the 'casquette', on its current models. The last Triumphs to sport nacelles were the 1966 models of the 6T [[Triumph Thunderbird]] 650, 5TA [[Triumph Speed Twin]] 500, and 3TA [[Triumph Twenty One]] 350.<ref>p 107, Davies, Ivor ''It's A Triumph''(Haynes Foulis 1980, 1990 edit.) {{ISBN|0 85429 182 2}}</ref>{{Citation needed|date=January 2011}} |
*[[Edward Turner (motorcycle designer)|Edward Turner]] used the term to describe his styling device introduced in 1949 to tidy the area around the headlamp and instrument panel of his [[Triumph Speed Twin]], [[Triumph Thunderbird|Thunderbird]] and [[Triumph Tiger 100|Tiger 100]] motorcycles. This styling device was much copied within the British industry thereafter, although Czech motorcycle manufacturer [[Česká Zbrojovka Strakonice]] was using it beforehand. Indeed, the [[Royal Enfield Bullet]] still retains its version, the 'casquette', on its current models. The last Triumphs to sport nacelles were the 1966 models of the 6T [[Triumph Thunderbird]] 650, 5TA [[Triumph Speed Twin]] 500, and 3TA [[Triumph Twenty One]] 350.<ref>p 107, Davies, Ivor ''It's A Triumph'' (Haynes Foulis 1980, 1990 edit.) {{ISBN|0 85429 182 2}}</ref>{{Citation needed|date=January 2011}} |
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*The generator and gearbox "shell" – with rotator shaft – on a [[horizontal-axis wind turbine]] (HAWT).<ref>[https://www.facebook.com/AmericanWindEnergyAssociation/videos/10152872502493775/ American Wind Energy Association (AWEA) video on construction of an individual wind turbine.]</ref> |
*The [[Nacelle (wind turbine)|generator and gearbox "shell"]] – with rotator shaft – on a [[horizontal-axis wind turbine]] (HAWT).<ref>[https://www.facebook.com/AmericanWindEnergyAssociation/videos/10152872502493775/ American Wind Energy Association (AWEA) video on construction of an individual wind turbine.]</ref> |
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*A forward projection of a catamaran's bridgedeck designed to soften the impact of seas or make more space inside the cabin. |
*A forward projection of a catamaran's bridgedeck designed to soften the impact of seas or make more space inside the cabin. |
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* |
*In the ''[[Star Trek]]'' franchise it is also used as a term for the housing containing coils that generate the warp field. This is separate to the engine that powers them. |
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{{Clr}} |
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==Design considerations== |
==Design considerations== |
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The primary design issue with aircraft-mounted nacelles is streamlining to |
The primary design issue with aircraft-mounted nacelles is streamlining to minimise [[Aerodynamic drag|drag]] so nacelles are mounted on slender pylons. This can cause issues with directing the needed conduits mounted within the nacelle to connect to the aircraft through such a narrow space. This is especially concerning with nacelles containing engines, as the fuel, and control, lines for multiple engine functions must all go through the pylons.<ref name="nacelledesignandsizing"></ref> |
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It is often necessary for nacelles to be asymmetrical, but aircraft designers try to keep asymmetrical elements to a minimum to reduce operator maintenance costs associated with having two sets of parts for either side of the aircraft.<ref name="nacelledesignandsizing"></ref> |
It is often necessary for nacelles to be asymmetrical, but aircraft designers try to keep asymmetrical elements to a minimum to reduce operator maintenance costs associated with having two sets of parts for either side of the aircraft.<ref name="nacelledesignandsizing"></ref> |
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== References == |
== References == |
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{{commons category|Nacelles}} |
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{{Wiktionary}} |
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{{Reflist}} |
{{Reflist}} |
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{{Aircraft components}} |
{{Aircraft components}} |
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{{Subject bar|auto=1|Technology|Aviation|wikt=nacelle}} |
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[[Category:Aircraft components]] |
[[Category:Aircraft components]] |
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Latest revision as of 23:30, 31 December 2024
A nacelle (/nəˈsɛl/ nə-SEL) is a streamlined container for aircraft parts such as engines, fuel or equipment.[1] When attached entirely outside the airframe, it is sometimes called a pod, in which case it is attached with a pylon or strut and the engine is known as a podded engine.[2] In some cases—for instance in the typical "Farman" type "pusher" aircraft, or the World War II-era P-38 Lightning or SAAB J21—an aircraft cockpit may also be housed in a nacelle, rather than in a conventional fuselage.
Etymology
[edit]Like many aviation terms, the word comes from French, in this case from a word for a small boat.[3]
Development
[edit]
The Arado Ar 234 was one of the first operational jet aircraft with engines mounted in nacelles. During its development, the four engines had four distinct nacelles. They once had their own landing gear wheel, but they were later combined to two nacelles with two engines each.
Around 2010, General Electric and NASA have developed nacelles with chevron-shaped trailing edges to reduce the engine noise of commercial aircraft, using an experimental Boeing 777 as a test platform.[4]
Applications
[edit]
Usually, multi-engined aircraft use nacelles for housing the engines.[5] Combat aircraft (such as the Eurofighter Typhoon) usually have the engines mounted within the fuselage. Some engines are installed in the aircraft wing, as in the De Havilland Comet and Flying Wing type aircraft. Engines may be mounted in individual nacelles, or in the case of larger aircraft such as the Boeing B-52 Stratofortress (pictured right) may have two engines mounted in a single nacelle. Nacelles can be made fully or partially detachable for holding expendable resources such as fuel and armaments. Nacelles may be used to house equipment that will only function remote from the fuselage, for example the Boeing E-3 Sentry radar is housed in a nacelle called a radome.
Other uses
[edit]- Edward Turner used the term to describe his styling device introduced in 1949 to tidy the area around the headlamp and instrument panel of his Triumph Speed Twin, Thunderbird and Tiger 100 motorcycles. This styling device was much copied within the British industry thereafter, although Czech motorcycle manufacturer Česká Zbrojovka Strakonice was using it beforehand. Indeed, the Royal Enfield Bullet still retains its version, the 'casquette', on its current models. The last Triumphs to sport nacelles were the 1966 models of the 6T Triumph Thunderbird 650, 5TA Triumph Speed Twin 500, and 3TA Triumph Twenty One 350.[6][citation needed]
- The generator and gearbox "shell" – with rotator shaft – on a horizontal-axis wind turbine (HAWT).[7]
- A forward projection of a catamaran's bridgedeck designed to soften the impact of seas or make more space inside the cabin.
- In the Star Trek franchise it is also used as a term for the housing containing coils that generate the warp field. This is separate to the engine that powers them.
Design considerations
[edit]The primary design issue with aircraft-mounted nacelles is streamlining to minimise drag so nacelles are mounted on slender pylons. This can cause issues with directing the needed conduits mounted within the nacelle to connect to the aircraft through such a narrow space. This is especially concerning with nacelles containing engines, as the fuel, and control, lines for multiple engine functions must all go through the pylons.[5] It is often necessary for nacelles to be asymmetrical, but aircraft designers try to keep asymmetrical elements to a minimum to reduce operator maintenance costs associated with having two sets of parts for either side of the aircraft.[5]
References
[edit]- ^ The Cambridge Aerospace Dictionary, Bill Gunston,ISBN 0 511 33833 3
- ^ Wragg, David W. (1973). A Dictionary of Aviation (first ed.). Osprey. p. 199. ISBN 9780850451634.
- ^ "Online Etymology Dictionary". Retrieved 5 December 2013.
- ^ "NASA Helps Create a More Silent Night". National Aeronautics and Space Administration. December 13, 2010. Archived from the original on January 18, 2017. Retrieved September 21, 2019.
- ^ a b c Ilan Kroo, Professor of Aeronautics and Astronautics (April 13, 1999). "Nacelle Design and Sizing". Aircraft Aerodynamics and Design Group at Stanford University. Archived from the original on March 7, 2001. Retrieved April 22, 2011.
- ^ p 107, Davies, Ivor It's A Triumph (Haynes Foulis 1980, 1990 edit.) ISBN 0 85429 182 2
- ^ American Wind Energy Association (AWEA) video on construction of an individual wind turbine.
