I don't know if I've previously made a post on Pprune where I've expressed feelings as strong as this, but...
The design of the A300-600 rudder system is stupid. All airliners need to progressively limit rudder travel to reduce the forces on the vertical fin as the airspeed increases. But the way Airbus chose to do this on this aircraft is dumb.
To move the rudder in an emergency, here's the required thought processes for both an A300-600 and a 767.
Problem - I have an attitude emergency at 290 kts. and I need to move the rudder. I might have to perform a rudder doublet (move the rudder to one side then the other), so how much pressure and travel do I impart to the rudder at this speed so I don't create full deflection, in case I need to perform a rudder doublet?
A300-600 Answer - Let's see, at this speed, the rudder pedal travel is 1/3rd of the low speed travel (1.3 inches/4 inches) for full deflection, and the required pedal pressure is 1/2 that required at low speed for full deflection. I have to successfully work this out while I'm in the middle of this emergency.
767 Answer - The same as always at any speed. Nothing to work out, do the same as you always do.
Now tell me if you don't think the A300-600 rudder design, isn't just out of its mind stupid.