Hi gums,
Guess I should have been a little more precise. Direct law does produce aileron movement proportional to stick movement as you say; but aileron movement produces a roll acceleration, which is why I wrote that stick movement commands a roll acceleration. That develops eventually into a roll rate which depends on aileron deflection, airspeed and the natural roll damping derivative. That means the characteristics are speed dependent whereas in the other laws you get the same roll rate for a given stick movement at any airspeed.
Putting the stick back to neutral in direct law will kill the roll rate not leave it at a commanded value as it does in normal/alternate. That is same as non-FBW aircraft and differs from your description of the Viper operations.
Last edited by Owain Glyndwr; 17th Jun 2014 at 17:46.