I like this idea, especially looking at your ship movement experiment. I have a question though about the movement numbered 6 in your illustration posted earlier. I understand why a ship slows down when running with the wind. However, what if a ship continues to reach throughout the manoeuvre (i.e. it stays in the green zone)? Is a slowing down justified in this case? Another thing I was wondering was that even if the ship does run with the wind during part of its movement, doesn't it nevertheless have enough momentum from reaching? This is not dissimilar to the reason you give for using the green arrow for movement number 3 in your illustration. I guess another way to pose this question is "Does a ship have the momentum to go from reaching to running to reaching again within a Sails of Glory turn?"