ABSTRACT
The more drastic the control input, and the more extreme the requested aircraft manoeuvre, the harder the control becomes to push or pull or turn. In a completely manual aircraft, where the primary flight controls are physically connected, via rods, linkages and cables, to the flight control surfaces (such as the flaps, ailerons and rudder), this increase in effort stems directly from the amount of rushing air the control surface(s) are pushing against. In much the same way, steering feel in a car arises because the control inceptor (the steering wheel) is physically linked to the system (the collection of steering, suspension and tyre systems) undergoing the stress of converting driver inputs into desired changes in trajectory.
