Error401

So, while this thread is kicking, is the rotation "design specific"? Tugs go this way, ocean liners go that way or is it individual boat specific? I'm working on a Darby with my father and we were wondering about this topic (a-la the rcg thread and the drawing I did). Our original question was specifically about the Darby tug, and the responses were got were all "fig 2". Is there some hydrodynamic reason some go like in fig 1?

Thanks,
Whitt