HYDROSTATIC SIDESTICK COUPLING

In a system for directing the motion of a vehicle, controllers, each of which independently controls motion of the vehicle, are linked to a coupling assembly to cause the controllers to experience substantially identical motion. The coupling assembly includes one or more fluid displacers that are linked to a first vehicle controller which force fluid from a first chamber, through a conduit, into a second chamber and against one or more fluid displacers that are linked to a second vehicle controller. The coupling assembly may be used to control motion of the aircraft in multiple degrees of freedom.