You ever really TRY to flip one of those things, Boatman? I'm sure it's possible, but I haven't figured out how yet.
The fin runs level in the water - period. You can trim it to do just about anything - stuff the bow down, or porpoise like crazy, or evenly lift
the whole boat and drastically improve performance. My first one, on an old 9.5 Evinrude
, was made from a retired road sign. It worked just as well as the plastic store-bought variety, but was slightly more likely to make you bleed. Fun times....