Editing Wingtip device (section)

=== Rotorcraft applications ===
[[File:ILA 2018, Schönefeld (1X7A5334).jpg|thumb|Wingtip device on a [[NHIndustries NH90]]]]
The main rotor blades of the [[AgustaWestland AW101]] (formerly the EH101) have a distinctive tip shape; pilots have found that this rotor design alters the downwash field and reduces [[Brownout (aviation)|brownout]] which limits visibility in dusty areas and leads to accidents.<ref name=NG>{{cite web|url=http://ngccommunity.nationalgeographic.com/ngcblogs/explorer/engineering/|first=Gareth|last=Harvey|title=Super Chopper : Life-Saving Features: No More Brown-Outs|publisher=National Geographic Channel|work=Engineering Archives|access-date=August 1, 2009|date=November 28, 2005|quote=To counteract this, the EH101's 'winged-tip' rotor blades create what its pilots call the "donut effect" – a circular window of clear air inside the dust storm that allows them to see the ground as they come in to land.|url-status=dead|archive-url=https://web.archive.org/web/20090721184318/http://ngccommunity.nationalgeographic.com/ngcblogs/explorer/engineering/|archive-date=July 21, 2009}}</ref>