The main subject of this work is the numerical study control of flow separation on a NACA 23015 airfoil by using wing cuff. This last is a leading edge modification done to the wing. The modification consists of a slight extension of the chord on the outboard section of the wings. https://www.roneverhart.com/Roland-Blues-Cube-Stage-1x12-60-Watt-Combo-Amp-p24291/