In Devotion to the Ocean: SeaCraft 23
What makes owners of the SeaCraft 23 sing with praise is a running surface from the drawing board of that unsung genius Carl Mosely.
In Mosely’s 1966 patent, the midship cross section shows a deadrise of 22 degrees down by the keel where the boat rides at high speeds, slicing the seas for a soft ride. It goes a third of the way up the hull, meeting a vertical groove (Mosely called it a step) to join the next panel. This one has 15 degrees of deadrise where the boat rides at moderate speeds, giving good load-carrying ability from less power. Another groove is cut into the hull, and the final and highest section is a flat 10 degrees, for more lift while getting on plane and for stability when going slowly.
Mosely’s multiple-deadrise design lets a boat ride on the right section for its speed, and when hitting a wave, the successively flatter panels slow the impact. In addition, the “steps” not only divert water to reduce drag, but they also act like keels to keep the boat tracking and gripping in turns.
Mosely applied his ideas to his new company, SeaCraft, which started in 1961 and went through numerous transitions before tracker Marine recently mothballed the brand.
Now, Sailfish Boats, a maker of saltwater fishers, employs a similar hull concept for its popular line. Like the classic SeaCraft, the hull slices through rough water on its sharp bottom section nearest the keel, but the deadrise flares out in two “steps” toward the chines. You can learn how to retrofit a classic of your own for $30,000 or more at classiccraftboats.com, or select Sailfish’s modern version of the hull design at sailfishboats.com.