In a series of flight tests, the low-cost X-36 research vehicle demonstrated the feasibility of using new flight control technologies in place of vertical and horizontal tails to improve the maneuverability and survivability of future fighter aircraft. During flight, the X-36 used new split ailerons and a thrust-vectoring nozzle for directional control. The ailerons not only split to provide yaw (left and right) control, but also raise and lower asymmetrically to provide roll control.