Re: Any merit to this gadget?? Outboard trolling plate
not that exact kind, but that idea of thing (usually square ones) are fairly popular with walleye fishermen here to reduce trolling speed. Or alternatively, they troll backwards since the prop is less efficient in that direction (and you go slower). Yes the one's I've seen have some mechanism to keep them raised when they're not in use. I personally use a smaller outboard as a trolling motor and then I can go as slow as I want.