Uh...I hope I'm not stating the obvious...the length of your shaft should be long enough to put your prop below the bottom of the stern of your boat. If it doesn't reach that far down, you will be in for a rather slow trolling speed.:):)
Age 65.
20 ft. Jetcraft. 90hp Evinrude Etec, 8hp Yamaha kicker, Minn Kota electric troller. Electric 1106 Scotty downriggers, Lowrance HDS7 Fish Finder/GPS. Airmar P66.
Also have a 15 ft. Gregor. 25hp Yamaha electric 2-stroke. Two electric 1106 Scotty downriggers. Lowrance HDS7 Fish Finder/GPS.
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