Hydraulic Flight Controls - Basic Question
OK - I'm displaying my ignorance here. None of my notes or books have an answer to this simple question regarding the positioning of flight controls that have infinite positions (ie ailerons, elevs, rudder, spoilers). How do the actuators or whatever move the control surface to where the flying control demands it to be? I can understand things like flaps or gear which have set positions and can be moved with hydraulic switches controlling double jacks. But when I wiggle the controls slightly what happens to make the control surfaces move just that amount and not more?
Am I missing something really simple?