The question is, how are leading edge flaps deployed with respect to other control surfaces, particularly flaps? I am building an SU-27 which uses LE flaps-not slats- and flaperons. I'm told on the full scale, the tailerons provide the basic roll control. From photos, the LE flaps appear to be lowered at times, while the flaps are in what appear to be neutral. Again from photos, the LE flaps are lowered for T/O and landings. The literature I've read says they deploy automatically; and again, photos, suggest they appear lowered in high AOA maneuvers. At first, I considered coupling them to the flaps. I know these things are used on Big Jets from other discussions here, Any thoughts on the subject? Why you ask? Because they are on the full size and I want it to look, and fly as scale as I can.