 Ailerons are not fitted, with roll control being provided by wing-mounted spoilers at low speed (which are disabled if the sweep angle exceeds 57°), and by differential operation of the all-moving tailerons at high speed.Full-span slats and flaps are used to increase lift both for landing and combat, with slats being set at 17° for landing and 7° for combat, while flaps are set at 35° for landing and 10° for combat.An air bag fills up the space occupied by the swept-back wing when the wing is in the forward position and a flexible fairing on top of the wing smooths out the shape transition between the fuselage and top wing area.