Has anyone tried a 20'' shaft on a 20 footer with a bracket? I do remember a few post's about the concern's of keeping the powerhead up out of the water by using a 25'' shaft length, but in this application on a 20 footer you could keep the bracket platform a little closer to the water line and you should have plenty of room to get your cavitation plate up higher and the powerhead should be high enough since we are talking about shaft length.
It appears that your initial set up of height on the transom side of your bracket is critical in dictating the size of shaft length with the height of bracket and placement of your bracket when mounting it to the hull.
Hugo, your last hole appears as if it will be pretty darn close.
good luck bill
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