Leading-edge slat: Difference between revisions

==History==

[[File:Voilure A319.jpg|thumb|A319 slats during landing]]

 

Independently of Lachmann, [[Handley Page]] Ltd in Great Britain also developed the slotted wing as a way to postpone the stall by delaying separation of the flow from the upper surface of the wing at high angles of attack, and applied for a patent in 1919; to avoid a patent challenge, they reached an ownership agreement with Lachmann. That year an [[Airco DH.9]] was fitted with slats and test flown.<ref>{{cite |first=F.|last= Handley Page |url=https://www.flightglobal.com/pdfarchive/view/1921/1921%20-%200844.html |title= Developments In Aircraft Design By The Use Of Slotted Wings | archiveurl=https://web.archive.org/web/20121103181345/http://www.flightglobal.com/pdfarchive/view/1921/1921%20-%200844.html |archivedate=2012-11-03 |work=Flight |date= December 22, 1921 | page= 844 |via=Flightglobal Archive |volume= XIII |number=678 |url-status=live }}</ref> Later, an [[Airco DH.9A]] was modified as a monoplane with a large wing fitted with full-span leading edge slats and trailing-edge ailerons (i.e. what would later be called trailing-edge flaps) that could be deployed in conjunction with the leading-edge slats to test improved low-speed performance. This was later known as the [[Handley Page H.P.20]]<ref>F. Handley Page [http://www.flightglobal.com/pdfarchive/view/1921/1921%20-%200845.html "Developments In Aircraft Design By The Use Of Slotted Wings"] {{webarchive|url=https://web.archive.org/web/20121103181419/http://www.flightglobal.com/pdfarchive/view/1921/1921%20-%200845.html |date=2012-11-03 }} ''Flight'', December 22nd 1921, photo page 845 of converted D.H.4 for testing of slotted wings</ref> Several years later, having subsequently taken employment at the Handley-Page aircraft company, Lachmann was responsible for a number of aircraft designs, including the [[Handley Page Hampden]].