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Sea Mite--A 10 ft Sail or Power Catamaran (Pub. No. 5080)

by William D. Jackson

"Sea Mite" is a sailer—"Sea Mite" is an outboarder—"Sea Mite" is the all-around shoal-draft utility boat you’ve wanted for protected-water fishing, hunting, and Sunday sailing.  At the waterline the inverted-V bottom, 65-in, beam, and 3-in, draft combine to give two slim hulls that move through the water with the lightest breeze or smallest outboard motor without putting up an argument The hull design also eliminates need for a centerboard, making Sea Mite an excellent sailing trainer. Depending on local lumber prices, $65 to $75 covers the cost of materials and, if you have a handsaw, you can get the hull ready for the water in about 50 hours.

16 pages, 4 plate(s)

King Kat (Pub. No. 5165)

by Keith Vining

Slung from a bipod mast, the lateen rig of this cat gives maximum performance on either tack or reach.

"King Kat" is a classy little catamaran that’s easy to build and easy on the pocketbook. What’s more, it sports a rig which makes it perform like a dream. The triangular sail, stretched between a sloping yard and a boom, has been slung from a short mast for almost as long as men have sailed. Apart from being beautiful in silhouette, it’s an efficient airfoil. A disadvantage has been that conventional (if stubby) mast. Of necessity, the yard and boom are slung to one side. This is fine when we’re racing along with the sail on the lee side of the mast, but what happens when we want to come about? Then the otherwise perfect sail wraps itself around the mast like a wind-swept skirt on a damsel’s leg--only the result isn’t so satisfying. Gone is the advantage, and unless we can find some way to hustle that sail around to the other side of the mast, what’s gained on the starboard tack is lost on the port, or vice versa. What’s needed is a sky hook to hold that yard up--and what we have in "King Kat" is practically that. But we have a pair of sturdy plywood legs holding that “hook” up and a stub mast to tie down the boom. Practical? Yes indeed, for on a catamaran we have a base broad enough to spread that bipod far enough to leave the sail clear at all times. Better yet, there are no stays to worry about. The top of the mast can be parted by loosening one nut, the bottom unhooked by tipping the legs outboard, the boom released by removing a pin and the whole wrapped up under the arm. The cat can then be used as an outboard.

17 pages, 2 plate(s)

Nugget (Pub. No. 5172)

by Arthur Piver

This 24-ft. trimaran can be built at rock-bottom cost.

The  trimaran  has proven to be not only fast and safe, but inexpensive and easy to build as well. It possesses the ideal sailing characteristics of great stability with light weight. The 24-foot Nugget, shown here, is easy to build, being almost all sheet plywood. It was designed especially for the amateur craftsman and has numerous building short cuts. There are no critical bends, and the construction has been simplified to the point where no lofting is necessary. A table of offsets is not even required. Here we have a boat which can sail at a speed of twenty knots (it is also extremely fast in light airs) and is apparently seaworthy enough to go around the world. The boat is easily trailed, as the side decks and floats fold compactly. It can sleep four people on short cruises, and the 14-foot beam provides loads of useful deck area. Draft (board up) is only 17 inches, so it is easy to beach.

8 pages, 3 plate(s)

Cat's Paw (Pub. No. 5188)

by David M. Swartout

White, sails, two hulls, and cat-quick speed with this 12-ft. catamaran sailer

Old-time, dyed-in-the-wool sailors sometimes look askance at sailing catamarans because of their unorthodox design. But these same sailors are usually looking ahead at them in a race because of the cats’ speed. For their length, catamarans can carry extra large sails aloft due to the wide, stable platform of the two hulls. More sail area to pick up the wind means more push, and any horsepower jockey knows that more push means more speed. But for the individual who just likes to spread white sails against blue water and isn’t worried about winning races, "Cat’s Paw" has other advantages. She’s easy to build because of the straight-sided hulls. The sheer line is flat and that simplifies building the form. Bow and stern are straight, so there’s no cockeyed bevel to fit and fuss with. "Cat’s Paw" is an ideal boat to learn or practice sailing in, because she will forgive so many mistakes. Operators of boys’ camps should consider building a fleet of these catamarans to add sailing to their water activities program. Boys will get a feeling of speed, learn the rudiments of sailing without worrying about capsizing if a gust of wind hits them at the wrong angle or if they mishandle her in a stiff breeze.

28 pages, 4 plate(s)

Kitty-Cat--An Easy-to-Build Catamaran (Pub. No. 5237)

by John Long

Whether you’re looking for something really different or just want a light, fast-sailing boat that’s easy to build and can take a lot of punishment, you’ll want to own "Kitty-Cat". This handsome little catamaran is guaranteed to inspire comments of envy and admiration wherever she makes an appearance, and she leaves mighty little to be desired in the way of snappy performance. The sailing catamaran had its origin in the South Seas. Hundreds of years ago, the islanders astounded the first white visitors with the speed and agility of their unusual craft. Early New England whalers are generally credited with bringing first reports on the fast little twin—hulled native boats to this country. During the past century, many “cats” have been built in all parts of the world. The type has continued to fluorish in Polynesia; today, Hawaii is the acknowledged center of catamaran activity, and the cats are currently enjoying steadily increasing popularity in the United States.

8 pages, 6 plate(s)

Gemini Cat--A 14 Ft Fiberglass Catamaran (Pub. No. 5284)

by S.T. Vetrosky

Here's a catamaran you can build by making a female plaster mold and forming hulls with fiberglass and polyester resin.

The hulls for this 14-foot fiberglass detachable catamaran sailboat are made by laying up 3 layers of fiberglass impregnated with polyester resin in a female plaster mold. The fiberglass hulls are approximately 1/8” thick at their sides and somewhat thicker at bottom due to resin sag. The hull decks are made of exterior plywood, coated with polyester resin on both sides. Epoxy resin is used to fasten decks to hulls. The wings are made of plywood and solid fir, screwed and cemented together with epoxy resin. Rudders are of stainless steel sheaths and aluminum blades. Stainless steel springs can be added to hold retracted rudders in raised position. Gemini Cat can be disassembled by removing sixteen 1/4“ bolts which attach hulls to wings. This feature enables one to completely build the boat in a basement, remove the finished parts and assemble outdoors. Also, the boat, when disassembled, can be car topped for transport.

8 pages, 3 plate(s)

Thrifty Cat (Pub. No. 5456)

by George Daniels

Thrifty Cat is endows with several feline virtues. For one, she provides lively action, which means sailing fun of a high order. This doesn't mean you can outdo a Hobie. They've a reputation for exceeding 20 knots, while Thrifty's achievement might lie in the 15-knot range. But then Thrifty won't cost you a big bundle, either, which thought can provide a bit of pleasure in itself.

10 pages, 2 plate(s)

Build the Hobby Kat (Pub. No. 5462)

by Hal Kelly

By now, everyone who digs boating has heard of the Hobie Cat, the sleek little catamaran that burst on the scene and captured the attention of all the fast-action sailors. Marked by asymmetrical hulls and special trampoline supports, the Hobie can reach speeds above 20 mph and perform with a rare agility. But it has one drawback. It costs mucho dinero. Thus, we introduce our Hobby Kat a build-it-yourself version of the Hobie that should cost from half to a third of the commercial version. If you have the moola, of course, go for a Hobie and have the time of your life on the water. If not, try our Hobby. The homebuilt is not quite the same. But she sails sweetly and fast—qualities which have made the Hobie popular. We clocked her informally at above 20 mph. Even in a light air she’ll slip through the water at a fast clip. She has no centerboards, leeboards or keel, and needs none. The inside of each hull has built-in lift, like an airplane wing, so that as the boat heels and one hull digs in the boat is pulled back to windward. She can run in very shallow water and the rudders kick up for beaching. You can carry her on a trailer or even disassemble her. Hobby Kat is not hard to build. Just don’t hurry. And understand what you’re doing and why before you do it. For best performance, the Kat must be light. The complete boat, minus sail, boom and mast, weighs 165 lbs.

9 pages, 3 plate(s)

Seafoam--A 16 foot LWL Catamaran (Pub. No. 5472)

by Charles Bell

Weight 700 lbs.; beam 8’; sail area 157 square feet.

Full-length sail battens, rotating, streamlined lightweight mast and a luff spar on the jib which permits reefing or furling the sail from the cockpit. Also features dagger centerboards and spring-loaded kick-up rudders. Seafoam is a sporty boat for those who like the kind of sailing that a sensitive cat of this size affords. It should be remembered, of course, that the so-called superior stability of sailing catamarans has been proven to be a myth. They can be upset and turned upside down in the water more easily than most supporters of catamarans will admit. And once upset, they are next to impossible to right in the water. With this element of danger in mind, Seafoam has safety flotation built into the center section and the hulls are left hollow. Essential safety requirements dictate that large deck plates be provided in each hull, so that in the event of an upset, one hull can be kept tight and the opposite hull can be flooded. When the flooded hull has sunk, the cat can be righted after disconnecting one stay. The flooded hull is pumped out, the mast reset, and the wetter and wiser crew then carries on. If you are a cat fan you know all of this and you will find that Seafoam is fast, maneuverable and quite dry—as cats go.

5 pages, 3 plate(s)

Flying Proa, The (Pub. No. 5540)

Strictly speaking, a sail-boat is a craft propelled by any sort or number of sails. Usually, however, the term sail-boat is restricted to an open pleasure-boat carrying a single sail, and rigged after the fashion called, for some inscrutable reason, the cat rig. When a pleasure-boat is large enough to have a cabin or carries a jib and mainsail, she is usually honored with the name of yacht, and is thus promoted above the rank of sail-boat. . . . The cat-boat is, then, always dangerous when in careless or incompetent hands, and sometimes unavoidably dangerous when managed by the best of sailors.  It is, however, the best and safest sail-boat which civilized boat-builders have produced, and we can not expect any thing safer from them. . . Nevertheless such a boat can be built, and with it two cool-headed girls can outsail the "Sappho" or the "Columbia" without risking any danger more serious than that of an occasional sprinkling of spray.  . . .The Feejee double canoe is not, however, the consummate flower of barbarian boat-building genius. It has been surpassed by the flying proa of the Ladrone Islands--a craft that combines to some extent both the hollow and the solid log ideas, and which merits a brief description here.

16 pages

Sailski--A 27' Racing Catamaran (Pub. No. 5666)

by L. Francis Herreshoff

This 27 ft. long racing catamaran was designed for those who seek high speed on the water under sail.

"Several readers of THE RUDDER have asked for the design of a sailing machine, and most of them have requested that it be cheap to construct. Now it is good fun to design a sailing machine, but to plan one which is simple and cheap to construct is really a most difficult matter. If this were not so there would have been many in the past, but so far none has been produced which was really fast, simple and cheap. In fact, the successful catamaran of the past has cost as much or more than the usual sailboat of the same sail area although they were often of one-quarter or less the weight of the sailboat. Much of the expense of the catamaran heretofore has gone into building a structure that would support a central sail plan between the two hulls. This has always proved complicated and expensive, so that in the design of the Sailski a radically different scheme or arrangement has been adopted.  The principal feature is that the sail plan is supported in all directions by a tripod which has the base of its legs near neutral axes, so when the hulls pitch, the rig and framework will not be strained. Therefore it is believed that the design of the "Sailski" is a very simple solution of a complex problem."--L. Francis Herreshoff

24 pages, 7 plate(s)

How to Build Gemini (Pub. No. 5763)

by David D. Beach

LOA 21' 1 1/2", BEAM 7 3/4"

Bowing to the increased interest in twin-hulled craft, this creator of advanced designs comes up with a 21’ catamaran cruiser powered by two big outboards.

The catamaran has demonstrated the principle that two narrow hulls pound less than one hull having the same total planing area. The proof of this is in the performance of this type of craft in rough-water races where the cats regularly win and place out in front of the conventional hulls. While they are not, in themselves, that much faster than other boats, they can be driven harder without punishing the passengers beyond the limits of comfort. They win because their crews take less beating in the waters that jar and bruise the occupants of standard-hull craft. Gemini is a catamaran outboard cruiser which will appeal to builders in many areas of the country. It is ideal where waters demand the need for sea-kindliness, shelter and speed. Do you run over to Catalina, do you cruise north through the Straits from Seattle, or do you have to cross Lake St. Clair? How about pushing up from the keys against a northerly breeze, or getting caught on Ponchartrain? Even the race to the south of Fishers Island can be a pretty miserable body of water at times. But it won’t phase Gemini. The twin hulls have ample freeboard, carry their deadrise all the way aft, and there is just the right amount of beam to permit efficient planing with modest powers. Let’s look at Gemini, starting with the Outboard Profile and Deck Arrangement Plan. This shows that the craft has an ample foredeck with good visibility all around from the cabin. The cabin proper encloses the midships section of the craft, leaving a modest after cockpit which is the full width of the craft. The stern is cut for two longshaft in-line outboard motors of up to 70 hp each. The cabin top is fitted, as shown, with a Solaria-type sunroof. This feature makes a substantially open boat of Gemini, with the cabin roof capable of being opened to the sky. Around the raised cockpit, with its full-width flush deck, is a low rail which provides a distinctive styling effect as well as a measure of safety for the younger members of the crew. The Inboard Profile and Arrangement Plan should be shown to the lady of the family, for the arrangement will certainly convince her that Gemini offers much comfort which will make her boating hours quite enjoyable. Point out to her the wide seats forward, and how they convert to sun lounges or berths, each wider than a studio couch. The headroom forward of the galley counter and the completely enclosed toilet space and dressing compartment is full for most wives, and adequate for all but the tallest men. The size of the rear cockpit is almost enough to qualify it as a “back porch.” Certainly those two chairs will illustrate that trolling over the transom presents no problem. Note how simple boarding the craft can be with a ladder over the transom and the hinged section of cockpit railing on the centerline. We think that some small amount of daydreaming will convince you that Gemini is ideal for most purposes.

8 pages, 5 plate(s)

Sea Surrey--A New Type of Catamaran (Pub. No. 5778)

by Gordon P. Manning

LOA 20', BEAM 8'

You can have a picnic aboard this 20’ pleasure barge. With no bilges to pump, you sit back and concentrate on having fun afloat

If you’ve ever wanted to build your own boat but hesitated because of the difficulty of making it watertight—here’s the craft for you. There are no complicated underwater joints to make, because it floats instead on four large blocks of Styrofoam, the miracle flotation material. With few underwater parts to concern you, the job consists mainly of building the plywood deck, floats, rails, canopy and control box. It’s a cinch, because you do straightforward hammer-and-saw carpentry most of the way. The finished catamaran, measuring 20’ long by 8’ wide, is a wonderful pleasure barge for use in protected waters. You just can’t beat it for fishing, swimming, sunning yourself, family picnics and the like. Drawing only 10” of water, it goes anywhere and can be run right up onto the beach. It will take any outboard motor from 10 to 40 hp. The 10-hp Evinrude we used on the pilot model was just perfect, pushing her at an estimated 7 to 8 mph. The complete boat will weigh about 1200 lbs., so you can trail it anywhere with a two-wheel trailer. And remember, cats like this sell on today’s market for two to three times what this one will cost you.

21 pages, 5 plate(s)

Schizo--A Fifteen-Foot Waterline Catamaran (Pub. No. 5792)

by Robert B. Harris

LOA 18' 7 ", BEAM 7' 91/2, DRAFT 1' 01/4", SAIL AREA 176 SWUARE FEET, DISPLACEMENT 900 LBS.

The ever increasing popularity of the catamaran type of sailing craft has brought with it an incessant demand for designs which are within the capability of amateur boatbuilders.

While the construction of a catamaran hull is no more complicated than for a more conventional type craft, there is of course the need for building twin hulls which are opposite hand but otherwise identical. Schizo, the name selected for this little boat is a contraction of schizophrenia, or dual personality, and seems well suited to the craft. This design has been carefully prepared and engineered. It should be followed closely and all details and dimensions adhered to exactly; any radical departures from the design will most certainly result in a faulty craft of uncertain performance. The building procedure and description of methods to be used will be helpful and should be followed as closely as conditions will permit.

6 pages, 6 plate(s)

Duo-Duet (Pub. No. 5867)

by David D. Beach

This twin-hulled, dual-engined beauty was designed to cruise a pair of couples in comfort. Two topside styles to choose from.

12 pages, 5 plate(s)

Building a Plywood Proa (Pub. No. 7945)

The original outrigger canoes of Polynesia are much larger but this design meets the limitations for amateur construction with 12 ft plywood.

3 page(s)

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