Editing Leading-edge extension (section)

==Dogtooth extension==
[[File:hawker hunter t7 blue diamond in planform arp.jpg|thumb|Dog tooth on the wing of a [[Hawker Hunter]]]]
A '''dogtooth''' is a small, sharp zig-zag break in the leading edge of a wing. It is usually used on a swept wing, to generate a [[vortex]] flow field to prevent separated flow from progressing outboard at high angle of attack.<ref>''Effects of Wing-Leading-Edge Modifications on a Full-Scale, Low-Wing General Aviation Airplane'', Nasa TP 2011</ref> The effect is the same as a [[wing fence]].<ref>[http://www.flightglobal.com/pdfarchive/view/1959/1959%20-%203173.html A Two-seat Gnat Development for the R.A.F.] ''Flight'' 1959</ref> It can also be used on straight wings in a [[drooped leading edge]] arrangement.{{citation needed|date=August 2015|reason=Is that really a dog tooth and not a cuff?}}

Many high-performance aircraft use the dogtooth design, which induces a vortex over the wing to control  boundary layer spanwise extension, increasing lift and improving resistance to stall. Some of the best-known uses of the dogtooth are in the stabilizer of the [[F-15 Eagle]] and the wings of the [[F-4 Phantom II]], [[F/A-18 Super Hornet]], [[CF-105|CF-105 Arrow]], [[Vought F-8 Crusader|F-8 Crusader]], and the [[Ilyushin Il-62]]. Where the dogtooth is added as an afterthought, as for example on the [[Hawker Hunter]] and some variants of the [[Quest Kodiak]], the dogtooth is created by adding an extension to the outer section of the leading edge.