differential aileron travel (airplane control system). The difference between the upward and downward
travel of an aileron. An aileron moves a greater number of degrees upward than downward to counteract adverse yaw.
The downward-moving aileron produces both induced and parasite drag, but the upward-moving aileron produces only parasite drag. To prevent the combined drag causing the nose of the airplane to start to move toward the down aileron, the up aileron travels a greater distance, producing enough additional parasite drag to overcome the induced drag caused by the down aileron. See adverse yaw.
differential amplifier (electronic amplifier). An amplifier with two inputs and one output. The signal on the output is an amplification of the difference between the signals on the two inputs.