The device, trademarked as the Kataka but generically referred to as a Segmented Spindle, is a compact form of linear actuator that ... unique advantage of a flat force/torque curve.

This simple STM setup utilises a piezoelectric actuator constructed by deliberately cutting a piezo speaker into four quadrants. With individual drive wires attached to the four quadrants.

Boeing discovered cracks in the aileron hinges of two KC-46s which were being readied for delivery, prompting the U.S. Air ...