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An airfoil surface control system includes a movable surface. An actuator is coupled to the surface. The airfoil surface control system includes a motor. A torque tube assembly operatively couples the motor and actuator and includes first and second shafts coupled by a universal joint. The universal

An airfoil surface control system includes a movable surface. An actuator is coupled to the surface. The airfoil surface control system includes a motor. A torque tube assembly operatively couples the motor and actuator and includes first and second shafts coupled by a universal joint. The universal joint is configured to provide a first maximum angle between the first and second shafts. A stop is configured to provide a second maximum angle between the first and second shafts that is less than the first maximum angle.

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1. An articulable rotational coupling comprising: first and second shafts;a universal joint coupling the first and second shaft and configured to provide a first maximum angle between the first and second shafts; anda stop assembly configured to provide a second maximum angle between the first and s

1. An articulable rotational coupling comprising: first and second shafts;a universal joint coupling the first and second shaft and configured to provide a first maximum angle between the first and second shafts; anda stop assembly configured to provide a second maximum angle between the first and second shafts that is less than the first maximum angle; andwherein the stop assembly includes a first stop feature provided by one of the first and second yokes, and second stop feature provided by the knuckle, the first and second stop features engaging one another to provide the second maximum angle, wherein the knuckle includes opposing sides, the second stop feature provided by a pocket on each of the opposing sides, and the first stop feature provided by a protrusion in each of the first and second shafts. 2. The coupling according to claim 1, wherein the first and second shafts respectively include first and second yokes coupled to one another by a knuckle. 3. The coupling according to claim 2, wherein the first and second yokes are joined to the knuckle by first and second fasteners that have intersecting axes. 4. The coupling according to claim 2, comprising a boot enclosing the universal joint and clamped to the first and second shafts. 5. The coupling according to claim 2, wherein each of the first and second yokes include spaced apart lateral sides, and the knuckle is disposed radially inwardly of the lateral sides and joining the yokes to one another. 6. The coupling according to claim 5, wherein the first yoke includes a wall interconnecting the lateral sides of the first yoke to provide an enclosed space within which the knuckle is arranged. 7. The coupling according to claim 6, wherein the stop assembly includes a protrusion extending from the wall and configured to cooperate with the second shaft to establish the second maximum angle. 8. An articulable rotational coupling comprising: first and second shafts;a universal joint coupling the first and second shaft and configured to provide a first maximum angle between the first and second shafts, wherein the first and second shafts respectively include first and second yokes coupled to one another by a knuckle;a stop assembly configured to provide a second maximum angle between the first and second shafts that is less than the first maximum angle; andwherein each of the first and second yokes include spaced apart lateral sides, and the knuckle is disposed radially inwardly of the lateral sides and joining the yokes to one another, wherein the first yoke includes a wall interconnecting the lateral sides of the first yoke to provide an enclosed space within which the knuckle is arranged, wherein the stop assembly includes a protrusion extending from the wall and configured to cooperate with the second shaft to establish the second maximum angle, wherein the second shaft includes a socket receiving the protrusion. 9. An articulable rotational coupling comprising: first and second shafts;a universal joint coupling the first and second shaft and configured to provide a first maximum angle between the first and second shafts, wherein the first and second shafts respectively include first and second yokes coupled to one another by a knuckle;a stop assembly configured to provide a second maximum angle between the first and second shafts that is less than the first maximum angle; andwherein each of the first and second yokes include spaced apart lateral sides, and the knuckle is disposed radially inwardly of the lateral sides and joining the yokes to one another, wherein the first yoke includes a wall interconnecting the lateral sides of the first yoke to provide an enclosed space within which the knuckle is arranged, wherein the stop assembly includes a protrusion extending from the wall and configured to cooperate with the second shaft to establish the second maximum angle, wherein the protrusion includes first and second radiused areas and a neck, and the second shaft includes a surface engaging the neck to define the second maximum angle. 10. An articulable rotational coupling comprising: first and second shafts;a universal joint coupling the first and second shaft and configured to provide a first maximum angle between the first and second shafts, wherein the first and second shafts respectively include first and second yokes coupled to one another by a knuckle; anda stop assembly configured to provide a second maximum angle between the first and second shafts that is less than the first maximum angle, wherein the stop assembly includes a first stop feature provided by the first yoke, and second stop feature provided by the second yoke, the first and second stop features engaging one another to provide the second maximum angle. 11. An airfoil surface control system comprising: a wing having a movable surface;an actuator coupled to the surface;a motor; anda torque tube assembly operatively coupling the motor and actuator and including first and second shafts coupled by a universal joint, the universal joint configured to provide a first maximum angle between the first and second shafts, and a stop assembly configured to provide a second maximum angle between the first and second shafts that is less than the first maximum angle; andwherein the first and second shafts respectively include first and second yokes coupled to one another by a knuckle, a boot enclosing the universal joint, each of the first and second yokes include spaced apart lateral sides, and the knuckle is disposed radially inwardly of the lateral sides and joining the yokes to one another, wherein the stop assembly includes a first stop feature provided by the first yoke, and second stop feature provided by the second yoke, the first and second stop features engaging one another to provide the second maximum angle. 12. The system according to claim 11, wherein the movable surface is a slat. 13. The system according to claim 11, wherein the movable surface is a flap.