The GV wing is a clean sheet redesign and is the reason for the lower Vref speeds. Major factors driving the wing design were the range requirement and the decision to move the engine nacelles back. Range dictated the wing area, aspect ratio, taper and thickness. Moving the engines back created a problem. On the GIV, the nacelle helps keep the shock wave in position over the inboard wing. Moving the GV nacelle back moved the shock back and required re-contouring of the root with a larger leading-edge radius to reposition the shock wave pressure.