Centerboard, swing keel, or keel, new monohull sail boat purchasers should at least consider vessels like Sadlers, Potters, Etaps and MacGregors that have solid flotation. They should also choose thin rather than wide monohulls. The thinner the hull, the more it is like a log in that it is self righting and of course the quicker the righting the less likely serious flooding.
The nature of the Murrelet centerboard is not well understood. MacGregor Yachts states in the cruiser’s brochure that
A long, thin airfoil is far more efficient than a short, wide one. This is why racing sailboat keels are deep, and why sailplane wings are long and thin.
There are four modes of sailing. Displacement mode, forced mode, planing, and the 4th mode. Obviously many ocean sailboats do not plane and hence there is no reason to learn sail planing techniques on those boats. In fact it is just the opposite.