Editing Leading-edge extension (section)

==Leading-edge vortex controller==
[[File:Sukhoi Su-57 RF-81775 Army-2022.jpg|thumb|Su-57 with its LEVCONs deployed.]]
Leading-edge vortex controller (LEVCON) systems are a continuation of leading-edge root extension (LERX) technology, but with actuation that allows the leading edge vortices to be modified without adjusting the aircraft's attitude.<ref>{{cite web |last1=Lee |first1=Gwo-Bin |title=Leading-edge Vortices Control on a Delta Wing by Micromachined Sensors and Actuators |url=http://www.las.inpe.br/~jrsenna/AerospaceMEMS/Contr-Ensaios-voo/caltech1.pdf|publisher= American Institute of Aeronautics and Astronautics|access-date=18 October 2018}}</ref> Otherwise they operate on the same principles as the LERX system to create lift augmenting leading edge vortices during high [[angle of attack]] flight.

This system has been incorporated in the Russian [[Sukhoi Su-57]] and Indian [[HAL Tejas|HAL LCA Navy]].<ref>{{cite web |last1=Sweetman |first1=Bill |title=Sukhoi T-50 Shows Flight-Control Innovations |url=http://aviationweek.com/awin/sukhoi-t-50-shows-flight-control-innovations |website=Aviation Week |publisher=Aviation Week & Space Technology |access-date=18 October 2018}}</ref>

The LEVCONs actuation ability also improves its performance over the LERX system in other areas.
When combined with the [[thrust vectoring|thrust vectoring controller]] (TVC), the aircraft controllability at extreme [[angle of attack|angles of attack]] is further increased, which assists in stunts which require [[supermaneuverability]] such as [[Pugachev's Cobra]].{{dubious|date=September 2019}}{{citation needed|date=September 2019}} Additionally, on the [[Sukhoi Su-57]] the LEVCON system is used for increased [[Departure resistance|departure-resistance]] in the event of TVC failure at a post-stall attitude. It can also be used for trimming the aircraft, and optimizing the lift to drag ratio during cruise.