I was just about to give up when i managed it.
The solution for me was to use an object variable, instead of object attribute, for both: rotation and accelaration.
For "Apply force to object" I added an"-" before the "$" and "+Math.PI/2" as you suggested.
So my expression is: -$Ship.getVariable("Angle")+Mah.PI/2 (Ship is my mainobject and Angle the object variable)
Thank you very much for your support.