In addition, ailerons, aileron trim tab and flaps were revised. The sideslip also uses aileron and opposite rudder. Many airplanes also have rudder and/or aileron trim systems. Each wing had a large aileron and the vertical fin carried a large rudder. This helps achieve enough airspeed to complete the roll without losing rudder and aileron control. These slips are performed by applying opposite inputs of the aileron and rudder controls. The A320, A330, A340 and A380 have no inboard aileron. A claimed benefit of the Frise aileron is the ability to counteract adverse yaw. This will counter the drag produced by the other aileron, thus reducing adverse yaw. This reduces the needed deflection of the aileron. Among its unpleasant characteristics was a wing design that allowed aileron reversal at high deflections. An aileron roll is an unbalanced maneuver. The hot air could escape through the apertures at the aileron hinges. In a real aircraft, the hat switch may control things like aileron or elevator trim. There were also problems with aileron control cylinders, electrical connectors, and engine compartment fires.