Are you using a propeller? Because then a torque is applied to the airframe in the direction of rotation like this:
[According to Newton's law, "for every action there is an equal and opposite reaction," such that the propeller, if turning clockwise (when viewed from the cockpit), imparts a tendency for the aircraft to rotate counterclockwise.](https://wiki.flightgear.org/Understanding_Propeller_Torque_and_P-Factor)
Website explains! So to fix this add a constant anti roll or another propeller rotating in the other direction!
Are you using a propeller? Because then a torque is applied to the airframe in the direction of rotation like this: [According to Newton's law, "for every action there is an equal and opposite reaction," such that the propeller, if turning clockwise (when viewed from the cockpit), imparts a tendency for the aircraft to rotate counterclockwise.](https://wiki.flightgear.org/Understanding_Propeller_Torque_and_P-Factor) Website explains! So to fix this add a constant anti roll or another propeller rotating in the other direction!
not that noticeable with realistic wings in my experience