Bill Fleetwood wrote back again about the remaining ports on his Gulfstar 50, "We need two more of the 18Rs, as I was a bit conservative in my original order. But first, please study the last attached photo. We have two aft facing ports mounted at more of an angle than the side mounted ports. Have you solved this problem for others, possibly by a special order or an adapter of some kind? If you can help us with something to keep rain out of ports even at such an angle, our order will be for four more."
Unfortunately we haven't come up with a solution to make PortVisors™ work in situations where the cabin has a great slope. [18R]