Motor Height Question
I have a 3.8 m JP Inflatable SIB with a 18 hp sshaft Tohatsu and 9"prop. I use this boat for spearfishing in the ocean (swells and wind chop). The boat carries two divers 110 kg (me) and 80 kg (son).
I was getting a fair bit of water spraying into the back of the boat when I first installed the motor directly on the transom. So I experimented with a number of engine heights. Then got an aluminium bracket made up that slips over the transom without having to drill holes. See the attached photo.
I consider the spraying problem to be fixed. Ie when travelling in a straight line and motor thrust rod in the hole closest to the transom. However, I get a little bit of cavitation when travelling in a straight line if I move the thrust rod out one hole.
Am I being anal or should I get another bracket made up to lower the motor about 5-10 mm or else buy a mini jacking plate.
What are your thoughts?