An assembly comprising: a first structure; a second structure configured to be moved relative to the first structure; and an actuator system arranged between the first structure and the second structure and configured to control relative movement between the first structure and the second structure, wherein the actuator system comprises: a drive shaft; a first rotary actuator element operably coupled to the drive shaft and configured to be driven in a first direction about the drive shaft; a second rotary actuator element positioned adjacent the first rotary actuator element and operably coupled to the drive shaft and configured to be driven in a second direction about the drive shaft, the second direction being a counter-rotation relative to the first direction; a spar fixedly connected to the first structure; and a spar connection (424, 426) configured to pivotably connect the first rotary actuator element to the spar at a fixed coupler; wherein the drive shaft, the first rotary actuator element, and the second rotary actuator element are housed within the second structure, and wherein rotation of the second rotary actuator element causes a translation motion of the drive shaft away from the first structure and rotation of the first rotary actuator element about the fixed coupler such that the second structure is translated and rotated relative to the first structure. a first structure; a second structure configured to be moved relative to the first structure; and an actuator system arranged between the first structure and the second structure and configured to control relative movement between the first structure and the second structure, wherein the actuator system comprises: a drive shaft; a first rotary actuator element operably coupled to the drive shaft and configured to be driven in a first direction about the drive shaft; a second rotary actuator element positioned adjacent the first rotary actuator element and operably coupled to the drive shaft and configured to be driven in a second direction about the drive shaft, the second direction being a counter-rotation relative to the first direction; a spar fixedly connected to the first structure; and a spar connection (424, 426) configured to pivotably connect the first rotary actuator element to the spar at a fixed coupler; wherein the drive shaft, the first rotary actuator element, and the second rotary actuator element are housed within the second structure, and wherein rotation of the second rotary actuator element causes a translation motion of the drive shaft away from the first structure and rotation of the first rotary actuator element about the fixed coupler such that the second structure is translated and rotated relative to the first structure. a drive shaft; a first rotary actuator element operably coupled to the drive shaft and configured to be driven in a first direction about the drive shaft; a second rotary actuator element positioned adjacent the first rotary actuator element and operably coupled to the drive shaft and configured to be driven in a second direction about the drive shaft, the second direction being a counter-rotation relative to the first direction; a spar fixedly connected to the first structure; and a spar connection (424, 426) configured to pivotably connect the first rotary actuator element to the spar at a fixed coupler; wherein the drive shaft, the first rotary actuator element, and the second rotary actuator element are housed within the second structure, and wherein rotation of the second rotary actuator element causes a translation motion of the drive shaft away from the first structure and rotation of the first rotary actuator element about the fixed coupler such that the second structure is translated and rotated relative to the first structure.