Good day Will
My folding schooner was built with a single off-centreboard about a
foot deeper than the plans. It is 3/8" steel plate with rounded leading
edge and chamfered down to 1/8" over 2" of the trailing edge.
Performace-wise it stalls at low speeds and sometimes sucks air due to
being a bit small but once the breeze is above 12 knots it flies to
windward. Am glad I made it a centreboard as our bay has many shallows
and coral bommies. We hit them or run aground so often the board is
called the galvanized depth sounder.