A320 roll function

[Uplinker]

I cannot quote any figures, but I am fairly sure that the rate of roll increases the further out of neutral you hold the side-stick.

e.g. holding 5° side-stick gives a fairly low roll rate. Holding the stick fully over gives a much faster roll rate.

So, no, not linear.

As far as control surface deflection; the FBW will order deflection based on the side-stick demand plus the FBW demand. I don't know if control surface deflection will be linear in terms of deflection versus roll demand, but I would doubt that it is.

I do know from doing the control checks, and observing control checks of other Airbus FBW, that the roll spoilers do not deploy until aileron deflection has already moved a certain amount, but again, I can't quote figures. I have a glitch with my Airbus electronic FCOM, so cannot check.