For a 20 foot seacraft-
Without having made one, but having modeled one in CAD, a 20" shaft inline 4 cylinder 4 stroke gets tight on a 24" transom if you want to tilt it the last few degrees, at least when I modeled a 4 cylinder yamaha tilted up at 70 degrees. At 60-65 degrees tilt, it looks ok.
I think the e-tec powerheads are shorter and you might be able to go to a 22" setback on a 20" shaft motor, maybe.
And I think a 25" shaft motor probably gets the powerhead above the rub rail on the transom on non-master anglers (which have that tall cap).
The pic below is of a 20 foot master angler with a 20" shaft yamaha 4 cylinder 4 stroke (F100)-
probably the worst case for clearance, and it still will work at just 24" setback at just a bit less than full tilt up.
Quote:
Originally Posted by strick
Everything centers around two measurements:
1. Engine shaft length
2. motor clearance when tilted up.
Figure these two things out and the rest comes into place. It is better if you do this in your head and draw it out on paper. 30 inch set back is a bit too much for a 20' foot boat in my mind. The 30 inch set back is for big V 8 motors that go on a 23 foot boat. Another thing....make your flotation chamber as big as possible. Good luck!
strick
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