These both seem to like the ventilation/cavitation plate 1 1/2" above the keel. I moved the motor up 1 1/2" on both my 20 SF and 18 SF. In both cases it made a world of difference. Both boats hopped up on a plane much faster, trimmed out better and generally ran much easier through the water. For reference the 18' has a 20" transom and the 20' has a 25". The old rule of thumb about having the plate even with the bottom of the boat does not seem to apply here.
Rod
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The older I get the faster I was!
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