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Originally Posted by dave2400
hi thanks for that i take onboard what you say about the shape and floatation but what about the 1inch per foot off setback is that ontop of fitting the bracket 2inch above the bottom off the hull or do you fit it 2inch above the bottom off the hull and then 1inch per foot off setback a.t.b dave
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Dave, I think the 1"/foot of setback is the often used rule of thumb for height of the motors anti ventilation plate above the keel. In my experience, it needs to be more than that. The engine makers say that the top of AV plate needs to be above the water when you're up on plane with motor trimmed out as far as you normally run. My bracket has a 2.5' setback, so that rule of thumb says my AV plate should be 2.5" above keel. However as you can see in attached pic, it's 3.25" above the metal rail extending aft from keel. I have since raised it to 4.25" and AV plate is STILL underwater, so it needs to come up about another inch! Therefore in my own experience that trade factor would seem to be about 5.25"/2.5' or roughly 2" per foot of setback!