In an attempt to replicate the Airbus trim system for the flight simulator further clarification on the rudder operation of the aircraft was required. Different scenarios were considered – take off roll, engine out with A/P engaged and disengaged, and crosswinds.
A proposed trim mechanism system using a linear actuator was sketched by Richard Long at CockpitSOLID.
Interfacing the hardware with the software (Prepar3D/FSUIPC/ProSimA320/Jeehell FMGS) remains a challenge.
Disclaimer: I am not a pilot; information derived from observations in a Level-D A320 simulator, engineers, professional pilots and the FCOM; it could be wrong and obviously should not be used as a reference for real world training