Abstract: A new and improved sailboat hull for traditionally designed, single hull sailboats having a generally tapered lower hull section, whereby the lower hull section is extended rearward beneath the rudder to a point aft of the visible stern. The lower hull extension contains ballast so that the center of gravity of the sailboat is moved toward the stern. The lower hull extension is telescopically adjustable with a direct, corresponding effect on ballast. Horizontal fins extend laterally from either side of the lower hull extension which also has a trim tab attached to its aft end.

Abstract: A catamaran stabilization structure for catamaran sailboats which includes a centerboard and dagger-boards. The centerboard has a double wing stabilizer with adjustable pitch. The dagger-boards protrude through each of the hulls. Each dagger-board has a single wing stabilizer.