However, most favour a teardrop-planform hull, with a wide, flat bottom and deep single-fin keel to give good stability.
From the en.wikipedia.org
Plywood catboat with salient keel fin.
From the en.wikipedia.org
Powerful hydraulics lever the 14-foot-long keel fin and attached lead ballast bulb up to windward at a sharp angle, creating a counterweight against the force of wind on sails.
From the washingtonpost.com
Transom hung rudders or far aft mounted fin rudders generate greater moment and faster turning than more forward mounted keel hung rudders.