Well excuse my English if that's the issue :P

The Ackerman line basically was invented for a steering wheel so that the inside wheel was steering more than the outside, the amount of Ackerman is the distance from the centre of the steering wheel and the imaginative centre for the 2 wheels arms, in this case I just change the wheels arms for where the cable is connected to the servo, Now my question again with other words: is the imaginative centre for the two points that the cable is attached to, "positive" closer to the rudder?

Many thanks for the time expended to translate my English to good English.