Editing Flap (aeronautics) (section)

=== Fowler flap ===
A split flap that slides backwards, before hinging downward, thereby increasing first chord, then camber.<ref>Gunston 2004, p. 249–250.</ref> The flap may form part of the upper surface of the wing, like a plain flap, or it may not, like a split flap, but it must slide rearward before lowering. As a defining feature – distinguishing it from the Gouge Flap – it always provides a slot effect. 

The flap was invented by [[Harlan D. Fowler]] in 1924, and tested by [[Fred Weick]] at [[National Advisory Committee for Aeronautics|NACA]] in 1932. First used on the [[Martin 146]] prototype in 1935, it entered production on the 1937 [[Lockheed Model 14 Super Electra|Lockheed Super Electra]],<ref>{{cite book|title= Wind and Beyond: A Documentary Journey Into the History of Aerodynamics|author=National Aeronautics and Space Administration}}</ref> and remains in widespread use on modern aircraft, often with multiple slots.<ref name="NASA">{{cite web |title=The Wind and Beyond: A Documentary Journey into the History of Aerodynamics in America. Volume 1; The Ascent of the Airplane |url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20040031410.pdf |website=ntrs.nasa.gov |date=January 2003 |publisher=NASA |access-date=17 July 2020 |archive-date=17 July 2020 |archive-url=https://web.archive.org/web/20200717172017/https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20040031410.pdf |url-status=live |last1=Hansen |first1=James R. |last2=Taylor |first2=D. Bryan |last3=Kinney |first3=Jeremy |last4=Lee |first4=J. Lawrence }}</ref>{{anchor|Junkers flap}}