Fifth M40-Class Motoryacht Launches at Princess Yachts It was only in March that Princess delivered the fourth M40 hull "X5" to her owner. Believe it or not, Princess has announced the launching of the fifth hull in the same series. If you thought X5 was distinctive enough with her sandy hull colour, this new yacht will surely set herself ahead of the pack in terms of instant recognition. The fifth hull is finished in a stunning turquoise colour and there is no mistaking her for any other M40-class yacht. The hull colour is somewhat reminiscent of the OceAnco build, "Sunrays".