Good morning Richard,
I remember taking one of the first ones out and testing it on everything anyone had at the Belle Isle pond (I think all boats had solid shafts) and it didn't do well on anything. They looked cool but hung on the wall a long time, so I took one and gold plated it, put it on a heavy gold chain, made a necklace out of it and sold it to a friend of mine that had a large cabin cruiser. We had similar luck with the V967 & V937. When Octura came out with these Tom P had gotten the numbers after visiting Mercury, Mercury was having success running them on the large full size racing outboards at the time. I'll have to spend some time thing about a current model boat application and let you know.
Thanks, John