Editing Stall (fluid dynamics) (section)

==Flight beyond the stall==
As a wing stalls, [[aileron]] effectiveness is reduced, rendering the plane difficult to control and increasing the risk of a spin. Post stall, steady flight beyond the stalling angle (where the coefficient of lift is largest) requires engine thrust to replace lift, as well as alternative controls to replace the loss of effectiveness of the ailerons. Short-term stalls at 90–120° (e.g. [[Pugachev's cobra]]) are sometimes performed at airshows.<ref>{{Cite web |last=Ace |date=24 Dec 2006 |title=Pugachev's Cobra Maneuver |url=http://www.aviationfans.com/node/12 |url-status=dead |archive-url=https://web.archive.org/web/20150609074321/http://www.aviationfans.com/node/12 |archive-date=9 Jun 2015 |website=Aviation Fans}}</ref> The highest angle of attack in sustained flight so far demonstrated was 70° in the [[X-31]] at the [[Dryden Flight Research Center]].<ref>{{cite web |url-status=dead |archive-url=https://web.archive.org/web/19990422071622/http://www.dfrc.nasa.gov/gallery/photo/X-31/HTML/EC94-42478-3.html |archive-date=22 Apr 1999 |url=http://www.dfrc.nasa.gov/gallery/photo/X-31/HTML/EC94-42478-3.html |title= X-31 EC94-42478-3: X-31 at high angle of attack }}</ref>  Sustained post-stall flight is a type of [[supermaneuverability]].