42' and 50' Cruising Sailboat Designs 42 ft Sailboat Hull

1/8 scale model under power

Cross section showing drop-down lockers

The advantages of dead rise in a hull. A hull with considerable dead rise will give a more gentle ride against weather because the bows and the bottom slide easier into the waves or into the water surface. This is important when one has to go against the weather over long stretches, or days on end. It is also easier on the hull and its integrity is more safe-guarded. Dead rise allows for less wetted surface as the hypotenuse (to which dead rise compares) is less in length than the sum of the other two sides of a triangle to which most racing hulls approximately conform. We are not truly dealing with triangles, but the idea of triangles is there. In lighter wind conditions a sailboat with dead rise will slide easier through the water.

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Under most sailing conditions dead rise coupled with a full keel allows for easier flow of water than a racing hull with a fin keel - first, because most sailing conditions do not allow a sailboat to start planing, and often do not allow the keel to become optimally effective, causing turbulence and drift. Second, sailboats of about forty feet and over with dead rise and full keel are always in optimum sailing condition in any weather on the water, no matter the conditions they meet. Sailboats with dead rise and a full keel track better and are easier kept on course. Such hulls consume less electrical charge when an automatic pilot is used to keep them on course.

L O A: - - - - - - - - - - - 42.08 ft station spacing: - - - - - - 3.125 ft freeboard: - - - - - - - - - 4.53 ft designed waterline length: 31.25 ft draft: - - - - - - - - - - - - 5.00 ft

Beam: - - - - - - - - 13.50 ft beam @ dwl: - - - - 11.22 ft displacement (light): 318 cubic ft / 20400 lbs wetted surface: - - - 361 square ft hull speed: - - - - - - 7 knots

The inside of the hulls from sole to the underside of the deck will be ceiled. This is a builders' term for applying, long, narrow, strips of wood tightly against each other against the frames along most of the inside of the hull. By doing so one can dispense with or lighten a lot of structural members as the ceiling stiffens and strengthens the hull considerably. It is common procedure on wooden boats. The waste spaces between the hull and the ceiling are filled with fire-retardant, closed-cell, hard foam. Other waste spaces inside the hull will also be filled with foam. This gives all kinds of advantages. It stiffens the boat even more, prevents the boat from consuming itself in a fire, it insulates against noise, heat and chill. By using diesel power one prevents gasoline fires and explosions that occasionally occur on gasoline-powered hulls. Also, the entire keel is protected from accidental collisions with under-water objects by its lead ballast.

The upwind mechanism makes the boat more maneuverable than other sailing vessels, very much needed in the busy, crowded close-quartered harbors of today. These designs would make marvelous boats to lease out with owner-on-board as skipper, especially so for the 50.5 ft model.

The hull is designed so that starting at about 12 degrees heel air can be introduced beneath the hull, which reduces the wetted surface and gives extra buoyancy at the leeward side of the hull. Air can be bled from scuba tanks or from industrial compressed-air tanks.

For pictures of the, 1/8 scale of the 42 ft, model hull @ approximately 2 knots speed click below on "one eighth scale, remote-controlled, sloop.htm" As can be seen, at 2 knots (equivalent to 5.6 knots of the full-scale hull), the hull moves almost effortlessly through the water. Performance of a 1/8 scale model of the 50.5 ft hull, would be even better and smoother than the proportionately beamier 42 ft hull.

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