Sail Boat Plans

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10-Foot Mark Boat, A (Pub. No. 5440)

A craft specially designed as a Mark Boat, also useful for many purposes.

Raced are run on a course which has previously been laid out by the regatta or race committee and which is provided with certain marks to show the direction of the course. Often well known objects such as Government buoys, lights, etc., are used but it more often happens that such objects are not available or that they are not conveniently spaced. It then becomes necessary for the race committee to place other objects on the course--they are generally placed only at the spots where the course changes direction. These objects, or marks, as they are properly called, have been a source of trouble to race committees and contestants and have spoiled many a race, through being improperly designed for their purpose. There are several reasons for this, the chief one being that the average race committee has had no experience in the design and construction of marks. A good many seem to think that almost any old thing that can float and cary a flag will do. They may be a little shy of money and some one will suggest a cheap and easily constructed mark, it is is used, generally with unsatisfactory results. The inexpensive and simple type of mark is a delusion. Such a mark lasts about a season, whereas a real good mark may cost more but will last twenty years with proper care and be far cheaper and infinitely more satisfactory in the end.

8 pages, 2 plate(s)

Modern Friendship Sloop, A (Pub. No. 5442)

by Ralph E. Winslow

Drawings and specifications for building a popular type of cruising auxiliary

Down in Maine before the advent of the power boat, practically all the shore fishing was done in small sloops known as Friendship sloops. These were so named because they originated in the town of Friendship, Maine, and they were built (for many years exclusively) by the well known Morse family. These boats were exceedingly able as they had to work in all weathers, winter and summer, and they were also fast in a breeze. They had a world of room, a beam ratio of about one to three and a draft ratio of about one to six. They were simply rigged with jib and mainsail, though some of the larger ones carried two headsails. The spars were extra heavy and needed but little standing rigging. Originally they were of the semi-clipper-bow type but later ones were built with a short spoon bow. Ballast was all inside on most of the boats but some of the later ones had quite a chunk of outside ballast. These boats were used principally for fishing but they also were useful as party boats in the summer time and some of the larger ones did general freighting at times. The power boat has now driven practically all of these sloops out of business and most of the better ones have been bought by yachtsmen and converted into cruising boats—mostly auxiliary. All of the existing boats are now quite old and not many are available these days. Realizing that this is a type which has always been popular, the Editor has asked me, being familiar with the Friendship type, to prepare building plans for one these boats based on the last boats of the type built and adapting the design to a roomy auxiliary cruising boat. The good features of the original boats have retained and several improvements have been made.

15 pages, 6 plate(s)

Rudder 20-Footer, The (Pub. No. 5445)

Complete plans and building instructions for a smart day-sailer of 20 feet waterline and 27 feet overall

by William F. Crosby

After a considerable amount of thought it has been decided to present the complete plans for the little boat shown on these pages. Unlike most RUDDER designs, she is a round-bottom boat as there has been a distinct demand for such a craft. There is a possibility that she might develop into a good one-design racing class but this will come later if enough builders become interested. We feel that there are too many small one-design classes and not enough larger ones and this boat has been designed as a sort of in-between proposition. She is larger than a Star, smaller than an Atlantic or International and is decidedly not a cruising boat. The Coastwise Cruisers, Week-Enders and dozens of other types of cruising class boats will take care of that end. This boat is essentially an afternoon sailer and while she is shown with a little cuddy forward, we honestly feel that she would be better with simply a large open cockpit. There is no galley, ice box or toilet as all these things cost money and she has been designed primarily to get the most boat and most sailing for the least possible amount of money. She carries a modern cutter rig and will sport a decent sized mainsail and overlapping jib in most instances. In addition the plans will subsequently show a parachute spinnaker and a working jib, the latter for use when jogging around and not racing. The cuddy will make a good place to keep light sails and the forward hatch should permit easy passing of the spinnaker in stops. Her total weight will be approximately 4,400 pounds of which about 900 pounds will be in the lead keel leaving around 300 pounds for inside trimming ballast. Her length overall is 27 feet and she is 20 feet on the waterline. Beam is 8 feet and the extreme draft with the board up is 2 feet 6 inches. With the board down it would come to about 5 feet 9 inches. The board is pivoted so that it will come up if it strikes an obstruction. The board will be made of half inch galvanized iron and will weigh about 220 pounds but a simple arrangement will make it possible to raise and lower the board without any great difficulty. The rig should be of stainless steel throughout. There is a single jumper strut and stay on the forward side of the mast with a permanent backstay to the transom. In addition she will have runner backstays to the deck on each side. The spreader and shroud arrangement will be very much like the rig of the National One-design which has proven exceptionally good.

14 pages, 6 plate(s)

How To Build the 36-Footer Sea Dawn (Pub. No. 5452)

by Daniel S. Crocker, Jr.

The auxiliary ketch Sea Dawn, was designed by the well-known Boston designer, S. S. Crocker, Jr. who has specialized for many years in the design of yachts of the cruising type

Sea Dawn is 36-feet in length and 11 feet in width and is of the husky seagoing type intended for service on deep waters but just as suitable for sailing on Long Island Sound, the Great Lakes or any similar bodies of water. We have heard a great deal about the seaworthiness of centerboard boats and we have received so many letters in this regard that we have no excuses to make for the use of the board in Sea Dawn. She is not an extreme shallow draft craft for there is a fairly deep keel with a good deal of drag which should be sufficient to permit her to go to windward in shoal water with a fair amount of success. In deeper waters the board can be sent dowr to provide the maximum lateral plane area. The ketch rig was used for obvious reasons. For short-handed cruising there has never been a better rig. In a short squall the mainsail can be let go with a rush and there will still be canvas enough to keep way on the boat. The average yawl has so small a mizzen that she will do nothing but bob up and down in the sea if the mainsail is taken off. The total area of canvas is low but quite sufficient for a cruising boat where comfort is the watchword and the crew is not pleased with the idea of jumping about every few minutes shifting sails. If there is any one item which can utterly spoil a good hull it is over-canvasing. Sea Dawn is fitted with a gaff-headed rig. Without a doubt many readers will think that they prefer the jibheaded, or Marconi, rig. Those who insist upon making this change are referred to the designer who no doubt will be quite willing to design a new sail plan, at his regular fee for such work. From the standpoint of THE RUDDER staff we urgently advise you to stick to the gaff rig. If Sea Dawn was intended for afternoon racing we would suggest a marconi rig but for ordinary cruising there has never been a better rig than the one shown. Below decks Sea Dawn is laid out to suit the desires of the average yachtsman. There are berths for four and a good toilet and galley. The latter is equipped with a sink, ice-box and one of the old-reliable Shipmate ranges. We believe that many owners of this fine boat will feel that four is a crowd, and not company, in a boat of this size. A suggestion for such folks would be to make the saloon berths a little longer and to add a great deal to the locker space.

15 pages, 5 plate(s)
Wee Nip, an 11' 6" Class Sailing Dinghy (Pub. No. 5453)

by Edson I. Schock

This boat has proved very popular, both as a racing dinghy and for afternoon sailing. The author’s three sons learned to sail in the original “Wee Nip,” the first boat built from this design. She is fast, stable, and easy to build, and she will go through a cellar door when finished; at least the original “Wee Nip” did. If you compare her with other dinghies which look quite similar, you will find that she has a lot more stability than most, due partly to her few extra inches beam, and partly to the shape of her hull. Her speed is about the same as that of sailing dinks of the same size and weight, and is considerably greater than that of the average 12-foot sailboat. About two hundred to two hundred and fifty of this class have been built, mostly by amateurs.

16 pages, 4 plate(s)

Sharon Potts-a 15' Knockabout (Pub. No. 5454)

by Edson I. Schock

This boat was intended as a one-design class to be built by the owners. They wanted a boat that would be easy to build, but the principal specification was speed. How well this requirement was met is shown by the fact that in handicap racing these "fifteens" give 18-foot round-bottom knocabouts a minute a mile head start, and beat them to the finish line. They are easily build, are light enough to carry easily on a small trailer,  and the material cost is within reason.

8 pages, 6 plate(s)

Tornado, A Hand 45-foot Auxiliary Schooner (Pub. No. 5455)

Designed by William H. Hand, Jr.

For those who want deep-water sailing, we commend the plans of Tornado, published herewith. She is a real boat for real sailormen. A ship in every sense of the word, embodying all the good features and qualities of larger vessels. Just the thing for general cruising with ample cabin and deck space. She is easily handled by two men and therefore will not require a large crew. Substantial enough and safe enough to take her proud owner anywhere he chooses to go. She is just under 45 feet long, 12 feet 61/2 inches beam, and almost 6 feet draft. The construction of Tornado is heavy and substantial throughout. Her frames are of white oak spaced 9 inches apart. Planking of Oregon pine is to finish not less than 11/4 inches thick. A heavy cast iron keel casting, weighing a ton and a half, is attached to the bottom of the keel. In addition, ballast composed of lead pigs and several tons of concrete made up with steel plate punchings will be added on the inside to increase the stability. Tornado, being a heavily built boat, is entirely beyond the range of the amateur builder. It will take the facilities of a well-equipped boat-yard to turn out a boat of this kind. The accommodations are ample and complete for a large party. Pipe berths in the forecastle take care of the crew while the main cabin has folding transom berths to accommodate four more persons. A very complete galley equipped with all conveniences is also provided. A regular stove, a large refrigerator, a sizeable sink and plenty of cupboard and locker space. The engine is given a compartment by itself and is one    of the heavy-duty fuel-oil engines of the Diesel variety. Horsepowers from 20 to 30 will be suitable to enable Tornado to make port comfortably in case of a calm. Additional pipe berths are also provided in the engine-room to take care of two additional persons. The total sleeping accommodations accordingly is sufficient therefore to provide for from ten to twelve people without undue crowding. Fuel is carried in a large tank under the cockpit floor and enough is carried to insure freedom from worry on this score. The cockpit from which the boat is steered and handled is roomy and big enough to accommodate the entire crew. Complete specifications and information to cpmplete the construction of Tornado are given.


The auxiliary schooner is rapidly growing in popularity, for the type is one which has probably more to recommend it to those who desire to cruise than any other type now in use. This little ship is, in size and lines, right for general cruising, as she is sufficiently large to give excellent cabin and deck space, also small enough to be easily handled by two men under almost any conditions. She is powered with an oil engine rather than gasoline to eliminate the gasoline hazard and to provide a reliable, efficient power plant which may be operated very economically.--WM. H. HAND, JR.

16 pages, 7 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)

Great Pelican (Pub. No. 5469)

by William Short

Big brother of the famous San Francisco one-design, this Pelican is suited for cruising rough waters

The Great Pelican is an enlarged version of the immensely popular one-design, The San Francisco Pelican. She is 16 ft. long with an 8-ft. beam and over 30 in. of freeboard amidships. Built with a cabin for cruising, you’ll often find this little boat out as far as the Golden Gate on a windy day and, as any West Coast sailor will tell you, this is as rough as inland sailing can get. We even heard from one Great Pelican owner who had sailed his modified home-built down the Pacific Coast to San Diego and then, with his wife as crew, crossed to Hawaii. I would never have recommended such a voyage, because I think of the Great Pelican as a weekender for inland or coastal waters, but I am constantly amazed at the voyages the little boat makes, and it is not limited to the West Coast. I had a call recently from an owner who had sailed his Great Pelican from New Brunswick, Canada down to Florida, and a builder in Nova Scotia claims that the boat is ideal for rough coastal waters.

8 pages, 4 plate(s)

Build Your Own Fiberglass Sloop (Pub. No. 5470)

by Whittier, Robert J.

This boat utilizes a little-known method of fiberglass boat-building that does not require a mold.

12 pages, 3 plate(s)

Aquasail--A 11.5 Ft. Day Sailor (Pub. No. 5471)

by Bob Whittier

This little daysailer with sail and jib is ideal for teaching the beginner the fine points of sailing.

One hesitates to use me word perfect in characterizing a boat—-first out of a natural modesty, second out of the knowledge that one man’s dreamboat is another man’s dog. But in the case of AquaSail, we feel compelled to say it’s perfect. Adapted from an old design, AquaSail floats with just the right jaunty, perky air. Her stability is right on the button with no crankiness to spoil her sunny disposition. And her response is superlative. In just a puff or two of wind she darts forward nicely. Designed first for those who have no experience in either building or handling a sailboat, AquaSail also can satisfy the experienced sailor and builder. Designed for two, she’s large enough to be out of the toy boat class. But with a length of 11½ ft. and a beam of 5 ft. she gives no trouble to the beginner learning to handle a sailboat. Her hull lines are simple and free of troublesome twists, a fact to be appreciated by the inexperienced builder. Yet theyre clean and smart enough not to cause her to bob and drift as some badly designed boats do

5 pages, 2 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)

Polaris--a 25' 6" Auxiliary Cruiser (Pub. No. 5486)

by S. S. Rabl

Polaris! Somehow or other that name creates visions of a rolling sea, a star above the horizon, a latitude shot. Polaris the north star has been a guiding point for mariners since the time when the first Viking long ship started its voyage across the western ocean. In Polaris, the cruiser, we guide the boatbuilder to the acme in a small auxiliary. Some sailboat men miss a lot of fun exploring shallow coves because their extreme draft does not allow them to enter. At the beginning it was decided to make this boat as shoal draft as possible and still keep her seaworthy, so a centerboard was used to secure the necessary lateral plane. High speed was desired on our craft and to this end her stern lines were flattened to keep her from squatting when a high-powered motor was installed. This to some extent hampers her good sailing qualities when heeled over because the transom corners drag in the water. For the real saiorman who will use only a small motor, we have made the after sections with two separate sets of offsets so that better sailing qualities may be obtained if high speed is not necessary. The fact that emergencies might demand that she be beached at times was the factor that decided on the full framed construction with all frames continuous around the hull.

13 pages, 3 plate(s)

Spindrift--A 30 ft. Auxiliary Cruiser (Pub. No. 5487)

by J. A. Emmett

It’s as simple in construction as a rowboat—and this Chesapeake Bay design gives you comfort and seaworthiness that would be hard to duplicate.

Spindrift is a yacht modification of the skipjack type as built by a number of small boatyards on Chesapeake Bay. The photographs show several of these boats of about the same size, each differing somewhat as to details of rig, cabin, rail, and so forth but all having the same main characteristics-—shoal draft, roominess, and the deadrise type hull, invariably crossplanked on the bottom, which means cheap and comparatively easy construction. Two sail plans are shown—-cutter and ketch: the former will be found faster for afternoon sailing and racing, the latter handier for more serious cruising. Both have been drawn up with simplicity of gear in mind; many of the fittings being such that they can be made up of strap brass, or of black iron then sent away for galvanizing. It is not necessary to lay down the complete lines, but it would be well to make the full-sized backbone laydown, Fig. 2. A 32x6-ft. floor built of cheap T, & G. lumber over 2x4-in. supports will more than repay its cost; or an inside floor this size can be used and heavy building paper laid over it if lines cannot be drawn directly on the floor. The advantage of this mold loft work is that with the backbone thus drawn exactly to shape the actual members can be cut out to go together perfectly without tedious fitting

12 pages, 8 plate(s)

Build Mercury--A Hudson River Iceboat (Pub. No. 5488)

by J. Julius Fanta

If you're looking for a thrilling iceboat design, you’ll like Mercury, the latest creation of the Hudson River type and a fast, trim racer with a moderate rig. This craft is a departure from the usual “banjo” cockpit model in that the crew sits upright and steers as in a car. A comfortable boat in heavy winds, Mercury is 20 feet long and carries 90 square feet of sail. No jib is necessary, as this sail has proved useless on iceboats. There are two cockpits, one located in front of the other. The T-angle iron runner blades prescribed are designed for sailing in snow as well as on clear ice. The laminated backbone construction, which is relatively simple, makes the hull extremely staunch and checkproof. Mercury is steered by remote control, with the steering quadrant coming back into the fore cockpit. Specifications given here provide not only for a weatherable craft but an attractive one.

8 pages, 4 plate(s)

Build Ice-Sprite--A Four-Runner Ice Boat (Pub. No. 5489)

by J. Julius Fanta

The four-runner iceboat is here for those who demand the most up-to-date innovation in this thrilling sport. The four-runner “Ice-Sprite” design has several features embodying greater safety. With four-cornered support, it rears up and hikes less. Moreover, the hull and sail does not tip forward or backward, as do other types. Because the position of the sail is stationary, capsizing is less likely to occur. In straight going, the rear runners track in the cuts of the fore runners. Thus with two tracks instead of three, friction is reduced and more speed is possible. As it weighs only 210 pounds, it sails and rides easily with added comfort from two runner-planks. The cockpit is large enough to accommodate two or three persons. Ice-Sprite will not spin. Designed with even balance, it requires no anti-capsizing skids on the runnerplank ends. The hull is symmetrical so that it can be steered in front equally well by reversing the direction of the runners and stepping the mast reversed on the after deck. The sail area is only 75 square feet.

8 pages, 4 plate(s)

Cappy--A 20' Cabin Sloop (Pub. No. 5490)

by J. Julius Fanta and Christ Sommer

Plans and details for Cappy are presented here for the man who has built his first boat and wants to gr aduate to a sportier and somewhat larger craft. However, this will not be too difficult a task for the novice toolsman, if special attention is given to all construction details. Cappy’s grace of line appeals to anyone with an eye for boats. With a well-designed Marconi rig, spreading 220 square feet of sail, this sloop is a noble sailer, capable of giving a good account of herself in rough weather. The rudder is underwater, permitting an outboard motor to be attached to the transom. For stability she has a 39” draft fin keel with an underslung 850-pound iron shoe. A foundry can turn out the casting at low cost and the amateur builder can install it without difficult operations. The six-foot beam provides safe footage on deck alongside the cabin trunk.

10 pages, 5 plate(s)

Corky--A Sailing Speedster (Pub. No. 5491)

For a sailing speedster that’s comfortable, roomy and does well in rough weather, this centerboard sloop will fill the bill. Few craft of Corky’s size, 18 feet with a 77¾-inch beam, have fast qualities as well as large cockpit accommodations. Corky is an ideal project for the novice to build, because it entails no complications in construction. All details are designed to simplify and facilitate work. Corky is in a class by herself when it comes to smart sailing and handling. Her 175-square foot sail area in a tall rig accounts for fast going in moderate breezes. The spread is not excessive for stiffer winds. She has a clean transom, so outboard power may be used. Canvas-covered, the deck is of prestwood or plywood, which eliminates tedious planking. V-shaped coaming rails flare aft to keep the cockpit dry.

12 pages, 5 plate(s)

Tiny Bear--A Junior Moth built of Plywood (Pub. No. 5495)

by J. Julius Fanta

Here is “Tiny Bear,” a junior Moth class scow-type sailboat that is about the easiest craft to build. Ten feet long and weighing only 70 pounds, it is as fast as it is small and light. It is intended for sailing by youngsters on protected waters, which are undisturbed by sizable waves. Grown-ups, too, will find equal enjoyment in sailing this craft, as there is ample room for two in the cockpit. So simple is the construction that “Tiny Bear” can be built in two or three days with no special tools. The construction is surprisingly simplified and expedited by planking the entire hull with ¼” plywood or Prestwood. The tedious job of fitting narrow planks is alien to this project. Good news is the fact that only one frame is necessary to mould the hull. Making this single mould frame is the logical beginning when building. Use ¾” by 4” rough pine for the frame and size it according to the accompanying sketch. White pine of ¾” stock is suitable for making the transom and bow plate. 8pp., 5 plates.

8 pages, 4 plate(s)

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