Wayne.B wrote:
....
The whole wing keel concept was really applicable only to the old
style 12 meter Americas Cup boats because of a design quirk in the
rating rule. ...

The Oz II keel had a lot of things going on including inverse taper,
and very thick winglets cum bulbs and, as a whole, it could only have
worked well on Oz II. When we saw it I think most of us though, "wow,
that keel is on upside down!" It is the upside down or inverse taper
part of that keel that was most notable and is least transferable to
non-meter designs. There is a theory that the inverse taper on the Oz
II keel smoothed out the spanwise lift for the entire boat including
its deep, narrow canoe body. If true, this would only work on oddly
shaped boats like late generation 12 meters and so, I think it's
reasonable to say that upside down keels are only applicable to 12
meters because of the rating rule.

Winglets and bulbs are a whole other kettle of fish, and they can work
well on many designs.

Anyway, for the OP, let me second the opinion that
http://www.marsmetal.com/newpages/torpedobulbs.html is worth a look.

-- Tom.