During flight, the operational wing sweep angle can be varied from 28 to 68 degrees relative to the pitch axis of the aircraft. This is a relatively simple mechanism of three links (ground, actuator, and wing), but uses linear actuation rather than direct rotation to control the sweep of each wing. A diagram with showing the overall dimensions of the aircraft and the mechanism architecture are shown below.
The mechanism is designed to provide significant mechanical advantage over the full range of motion and driven by an actuator similar to that shown below, which uses a gear train and lead screw to convert rotational motor input into linear actuation.
A simple animated Solidworks model of the mechanism is shown to the right (note: model is not to scale).