Editing Wingtip device (section)

==== Blended winglets ====
A blended winglet is attached to the wing with a smooth curve instead of a sharp angle and is intended to reduce [[interference drag]] at the wing/winglet junction. A sharp interior angle in this region can interact with the [[boundary layer]] flow causing a drag inducing vortex, negating some of the benefit of the winglet. [[Seattle]]-based [[Aviation Partners]] develops blended winglets as retrofits for the [[Gulfstream II]], [[Hawker 800]] and the [[Falcon 2000]].

<gallery mode="packed" heights="140px">
File:Winglet and nav light arp.jpg|[[Boeing 747-400]] canted winglet
File:Lufthansa winglet (14511808755).jpg|[[A320 family|Airbus A320]] sharklet (blended winglet)
File:Delta Air Lines 767-400ER @LHR.jpg|[[Boeing 767#767-400ER|Boeing 767-400ER]] with raked wingtips
File:Wing.slat.600pix.jpg|[[Airbus A310-300]] wingtip fence
</gallery>

On February 18, 2000, blended winglets were announced as an option for the [[Boeing 737 Next Generation#737-800|Boeing 737-800]]; the first shipset was installed on 14 February 2001 and entered revenue service with [[Hapag-Lloyd Flug]] on 8 May 2001.<ref>{{cite web |url= http://boeing.com:80/commercial/737family/pf/pf_ng_milestones.html |archive-url= https://web.archive.org/web/20080429193504/http://boeing.com/commercial/737family/pf/pf_ng_milestones.html |url-status= dead |archive-date= 2008-04-29 |title= Next-Generation 737 Program Milestones |publisher= Boeing |access-date= 2019-02-05 }}</ref> The Aviation Partners/Boeing {{cvt|8|ft|m}} extensions decrease [[fuel economy in aircraft|fuel consumption]] by 4% for long-range flights and increase range by {{cvt|130 or 200|nmi|km}} for the 737-800 or the derivative [[Boeing Business Jet]] as standard.<ref name="bca_aero_17_wingtip_devices" /> Also offered for the [[737 Classic]], many operators have retrofitted their fleets with these for the fuel savings.{{citation needed|date=November 2018}} Aviation Partners Boeing also offers blended winglets for the [[Boeing 757|757]] and [[Boeing 767|767-300ER]].<ref>{{cite magazine |magazine= [[Aviation Week & Space Technology]] |date= February 23, 2009 |url= http://aviationweek.com/awin/american-airlines-set-debut-767-winglet-mod |title= American Airlines Set To Debut 767 Winglet Mod |author= Guy Norris |page= 39 |url-access= subscription}}</ref> In 2006 Airbus tested two candidate blended winglets, designed by Winglet Technology and Airbus for the [[Airbus A320 family]].<ref>{{cite news |url= http://www.boeing.com/news/frontiers/archive/2006/march/i_iw.html |at= Airbus to test new winglets for single-aisle jetliners |title= Industry Wrap |publisher= Boeing |work= Frontiers |volume= 4 |issue= 10 |date= March 2006}}</ref> In 2009 Airbus launched its "Sharklet" blended winglet, designed to enhance the [[payload-range]] of its [[A320 family]] and reduce fuel burn by up to 4% over longer sectors.<ref>{{cite press release |url= http://www.airbus.com/newsroom/press-releases/en/2013/07/american-airlines-takes-delivery-of-its-first-a320-family-aircraft.html |title= American Airlines takes delivery of its first A320 Family aircraft |publisher= Airbus |date= July 23, 2013 |access-date= November 1, 2017 |archive-date= November 7, 2017 |archive-url= https://web.archive.org/web/20171107005102/http://www.airbus.com/newsroom/press-releases/en/2013/07/american-airlines-takes-delivery-of-its-first-a320-family-aircraft.html |url-status= dead }}</ref> This corresponds to an annual CO<sub>2</sub> reduction of 700 tonnes per aircraft.<ref>{{cite press release |url= http://www.airbus.com/presscentre/pressreleases/press-release-detail/detail/korean-air-aerospace-to-manufacture-new-a320-family-sharklets/ |title= Korean Air Aerospace to manufacture and distribute Sharklets |publisher= Airbus |date= May 31, 2010 }}</ref> The A320s fitted with Sharklets were delivered beginning in 2012.<ref name="Airbus15Nov09">{{cite web |url =http://www.aircraft.airbus.com/presscentre/pressreleases/press-release-detail/detail/airbus-launches-sharklet-large-wingtip-devices-for-a320-family-with-commitment-from-air-new-zealan/ |title =Airbus launches "Sharklet" large wingtip devices for A320 Family with commitment from Air New Zealand |publisher =[[Airbus]] |date =15 November 2009 |url-status =dead |archive-url =https://web.archive.org/web/20171107021641/http://www.aircraft.airbus.com/presscentre/pressreleases/press-release-detail/detail/airbus-launches-sharklet-large-wingtip-devices-for-a320-family-with-commitment-from-air-new-zealan/ |archive-date =7 November 2017 }}</ref><ref name=":0">{{Cite web|last=Gardiner|first=Ginger|date=May 1, 2014|title=First A320neo features composite Korean Sharklets|url=https://www.compositesworld.com/articles/first-a320neo-in-final-assembly-features-composite-sharklets-made-in-korea|access-date=2020-09-09|website=CompositesWorld}}</ref> They are used on the [[A320neo]], the [[A330neo]] and the [[Airbus A350|A350]]. They are also offered as a retrofit option.<ref name=":0" /><ref>{{Cite web|title=Airbus Selects Korean Air Aerospace to manufacture Sharklet wingtips for the A330neo Family|url=https://www.airbus.com/newsroom/press-releases/en/2015/04/airbus-selects-korean-air-aerospace-to-manufacture-sharklet-wingtips-for-the-a330neo-family.html|archive-url=https://web.archive.org/web/20230126121852/https://www.airbus.com/newsroom/press-releases/en/2015/04/airbus-selects-korean-air-aerospace-to-manufacture-sharklet-wingtips-for-the-a330neo-family.html|url-status=dead|archive-date=January 26, 2023|access-date=2020-09-09|website=Airbus}}</ref>