There is no option to set y axis inversion for only certain types of vehicles.
- Legacy ID
there is so an option to invert mouse controls for helicopters alone. Look in the
controls menu, then use the dropbox to select helicopter controls. From here you
can see that there is a setting that your mouse up and mouse down controls are bound to. simply swap the mouse up one with mouse down, and mouse down with mouse up. then u have the helicopter controls the way u want.