I have a buddy who has a Dewey's 1852 g3 package with a 50horse yami prop. Obviously a non-tunnel hull as it came rigged for a prop. Recently he bought his own jet package and installed it, along with a CMC power lift. All said and done, due to the thickness of the power lift (5"+/-), the front of his intake foot is sitting somewhere between 10"-12" away from the back of the boat, and he's getting some bad cavitation. He's getting a top speed of about 23mph, and the thing takes forever to get out of the water after take off (probably 8-10 boat lengths) with just he and I in it, even with me moving all of the way to the bow. Also for what it's worth, running a straight edge off the bottom of the boat, off the back of the boat, it looks like the front of his intake foot is sitting about 1/2" below the bottom of the boat. In contrast, I set mine about .25" below the bottom of my little 14' jon boat, 40/30 jet, and it seems to do really well with no noticeable cavitation.
With my limited experience outfitting OB jets, I noticed a couple of things. His g3 has a chine running right down the middle of the boat, which I'm guessing doesn't help to bleed off air from the water by the time it hits the back. Also, my immediate observation is that the 10"-12" of gap from the back of his boat to the jet intake (depending on the trim) gives way to a lot of aerated turbulent water. I'm guessing this is why I see guys running plastic/aluminum horizontally from the back of the boat to the jet intake. Is there a right way/wrong way of doing this? how do you work around the center chine on the bottom of the boat, to feet clean water to the jet? With that much gap, how does a guy go about supporting this piece of material?
Any advice would be outstanding.