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. . . Raising the bracket slightly allows the water to break clean off the original planning surface (hull), but its there almost in an instant for displacement when you come off plane or a swell overtakes you.
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There is also a bit of a performance benefit to the bracket. Since the water want's to rise after it clears the transom, when you move the motor aft you can also raise it, at least one inch per foot of setback. Less lower unit in water = less drag, which translates to a little more top speed. I've seen reports that a bracket can be worth 2-3 mph.
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Thanks Denny, I'm not so worried about the high end performance gained, but the ability to slog it out against the slop in comfort. A motor in the 150 hp range will get me all the speed I need (except maybe on a really flat warm day
. I'm worried about slow planing speed.
On another note. the waterline on the I/O Seafari is truely amazing how deep it sat in the water with several hundred pounds of extra weight. I haven't ridden in one, but they must ride well with all that weight forward.
Tod