42' and 50' Cruising Yacht Designs

42 ft Ketch Rig

Ketch sailboat without flying stern seat and set with standard sails

Ketch without flying stern seat and set with light wind sails

Ketch with flying stern seat and set with standard sails

Ketch sailboat with flying stern seat and set with light wind sails

Ketch with flying stern seat and set with light wind sails


The inside of the sailboat 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 sailboat boats. The waste space 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 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 pertinent data of the hull are as follows:

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

A table of the sail areas and aspect ratios is shown below:

Standard jib area: - - - 395 sq ft (aspect ratio: - - 4.5/1)
Standard main sail: - - 366 sq ft (aspect ratio: - - 5.5/1)
Standard mizzen sail: - -182 sq ft (aspect ratio: - - 5.95/1)

Light wind drifter: - - - 750 sq ft

Mizzen stay sail: - - - - 450 sq ft

The light-wind sails are sheeted to special blocks near the end of the main and mizzen booms and the sails can be hauled over just like a regular jib. The sails can thus be handled using either or both boom sheets and jib sheets.

The forward drifter sail, when running before the wind, can be used in conjunction with the standard jib as there are two head stays 3" apart and two blocks at the top of the mast.

For pictures of the 1/8-scale model of the 42 ft hull @ approximately 2 knots click below on one eighth scale, remote-controlled sloop.

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.

The yacht can be loaded with people, gear and supplies to the weight of 5500 lbs beyond the light displacement of 20400 lbs.

Innovative Cruising Boat Designs extends an invitation to builders and prospective boat buyers to peruse what we offer. These designs are prestigious and lucrative to builders and a pleasure and super-safe to own.

Contact us and we will show you!

Now, we also have a metal-constructed superfast and super shallow, cruising hull design. This hull goes faster, can do what no other hull can do, and can go where no other boat its size (from 30 ft up to 500 ft) can go.

A must for the military!

Page created on 08 28 2010

Innovative Cruising Boat Designs

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