Power Boat Plans


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River Queen (Pub. No. 5701)

by Charles Bell

LOA 24', BEAM 8', DRAFT 10", WEIGHT 2,500, FLOTATION TO 8,640 pounds.

River Queen is a real houseboat that will accommodate a family of six.

She has all the comforts of home plus the ability to navigate inland waters. She is V-bottomed and has good stability even in a brisk breeze and moderate waves, but, of course, none but the foolish would try to traverse large bodies of water in a houseboat of this type because she is not intended for that. The barge on which the house is erected has 3 feet of freeboard so that she is a boat and with a Universal “C” drive 113 h.p. motor she will cruise at about 5 knots. The boat is ideal for calm river passages and secluded lakes and her 8-foot beam and light weight (for a houseboat) allows her to be trailered anywhere. The layout provides a spacious fore deck and an adequate after deck with controls located at the bow on the main deck and directly overhead on the sun deck. The sun deck spans the whole size of the boat and is reached by ladder from both the bow and stern. A most unusual feature of River Queen is her side decks which fold up quickly against the sides and let down in one-half minute once the boat is at anchor or nosed in against the bank This provides a walkway, fishing platform and boat landing around the boat which can be reached without going through the cabin. River Queen draws 10 inches of water, weighs 2,500 pounds, and has enough rigid Styrofoam in her bottom to float 8,640 pounds. Water could run through the cabin but the boat would not sink more than 2 or 3 inches.

4 pages, 1 plate(s)

Restless--A 30-Ft. Cruiser (Pub. No. 5703)

by Donald H. Smith, N. A.

Big, bright and brawny, this 30-ft. cruiser will go anywhere you take he--and with pleasure.

Appropriately named as she is big, this brawny inboard-powered cruising boat which can stay out when the going gets rough is equally at home in ocean, bay, river, or lake. She compromises cruising comfort for a party of four with outdoor living as provided by a cockpit deck comprising almost 90 square feet of sunning, lounging, and fishing space. During recent years, there has been a notable revival in raised or flush deck schemes for yachts of all sizes. This undoubtedly stems  from a basic recognition of the advantages of such design when coupled to the many new innovations and modern concepts assdciated with small craft styling and arrangement. Restless is is a good example of the contemporary graciousness of the raised deck design principle, embodying such related features as a large roomy cabin, an abundance of total deck area, more rigid as well as less expensive construction, and excellent seakeeping abilities. Restless' cabin provides a dinette which converts to a double berth, an enclosed head, a complete galley, and twin berths up forward. She offers all-weather protection and clear, unobstructed visibility for the helmsman beneath the sturdy she!ter top. Flush engine hatches give the cockpit an aura of exceptional size and spaciousness. The sport fisherman would find ample room for fighting chairs and a fish well if so desired.

7 pages, 6 plate(s)

Cruise-Mate--A 19-Ft. Cruiser (Pub. No. 5704)

by William F. Crosby

Designed for short cruises on protected waters, Cruise-Mate is the ideal boat for the man who wants to enjoy a week-end or a few days more afloat without spending a fortune to do it. Modern in design and constructed almost entirely of plywood, the boat provides good cruising accommodations for two with ample cockpit space for larger parties on day trips. The recommended power is an Evinrude Speeditwin Motor of 22 hp. fitted with a 5 in. extra length shaft, and installed in a well at the stern. With this motor, or another make of the same power, Cruise-Mate should do between 12 and 14 miles an hour with two persons on board. By mounting the outboard at the stern, the space normally taken up by an inboard engine has been used to provide a surprising amount of cruising space for a boat with an overall length of exactly 19 ft. and a beam of 8 ft. 5 in. The freeboard at the bow is 3 ft. 5 in., while at stern it narrows down to 2½ ft. Below decks the cruiser has two berths that will take six footers (not the usual shelves designed for Singers’ midgets), space for a small stove and ice chest, plus ample stowage space under the berths and in the rope locker forward. Obviously you can’t get full headroom in the cabin of a 19 ft. boat without raising the top out of all proportion. However, there is over 4 ft. under the cabin carlins which means good sitting headroom. Anyway you’ll spend 90% of your waking hours in the cockpit where there’s full standing headroom of 6 ft. and excellent visibility through the two windshields.

16 pages, 3 plate(s)

Zephyr (Pub. No. 5723)

by Charles Bell

LOA 14’, BEAM 6’, DEPTH OF HULL 33”. WEIGHT  approx. 500 lbs. and has 960 lbs. positive flotation.

Zephyr is a fast runabout and will take a 50 h.p. motor. However, I recommend that a smaller motor be used for ordinary cruising and water-ski towing. A 35 or 40 h.p. with the proper prop and setting will give almost as much speed as a 50 and will be much safer to operate. A tow tender is a “must” for ski towing with this boat so that the driver can give all his attention to driving. A rearview mirror helps but it is not enough safetywise to tow a skier with just a driver and a mirror.

8 pages, 5 plate(s)

Whistler (Pub. No. 5724)

by Weston Farmer

LOA 15-' 9", BEAM 5' 6", DRAFT 151/2", DISPLACEMENT 850 POUNDS.

Light enough to go on a trailer with ease, her simple-to-build strip construction makes Whistler fast and inexpensive. She’s 15 feet, nine inches and will give you speeds up to 22 miles-an-hour

This exquisitely shaped little motorboat fill the bill for the back yard builder who wants inboard economy and convenience. Whistler will give you extreme trailability; and she is of strip construciton so that those who canwork only limited hours on her can build her a few strips an evening. Launched and ready to test with one passenger and the usual boatload of oil cans, gimmics and equipment, chances are that she'll weigh 1, 256 pounds. Thus she is light and portable. Any 1,000-pound trailer will handle her. The building of Whistler is simplicity itself, usually grasped at once by one who has never built a boat before.

7 pages, 6 plate(s)

Sure Mike II (Pub. No. 5725)

by Weston Farmer

LOA 21', BEAM 8', DRAFT 1' 10"

Down the skidways with a splash of champagne and salt spray comes Sure Mike II—a family boat built for the heaviest outboard motors. Her 21 feet are designed for easy building. Roomy bunks, a galley and head make for big boat comfort on extended blue water cruises. You can expect speeds up to 22 miles-an-hour with a powerful 55 horsepower motor. Two small motors will drive her about 16 mph.

Here we have Sure Mike II, ideally calculated to take the largest stock outboard motor, the Mercury Mark 55. This boat is 21 feet long with an 8-foot beam. She probably comes closer to the size of small cruiser desired by most men than any other boat of this type we have run in the Boatbuilding Annuals. She is carefully sized, having been swimming around on my sketch pad for a couple of years. As to her running qualities, little more can be asked from a boat this size. I’ve approached the problem of construction from all angles and have decided on a seam-batten job, with planking specified in the usual manner. If it is desired, the topside strakes may be cut from 3/8-inch 5-ply marine grade plywood. I would plank her bottom in regular seam-batten fashion, using mahogany or white cedar planking of the thickness specified. I decided on this type of construction on the basis of (1) my own experience handling large plywood panels in a home shop, and (2) after much talk with men who have tried to plank a hull this size in “one hunk.” The condensed gist of all thought runs like this: The average man isn’t equipped to loft a generated surface hull this size. He hasn’t the tools or know-how to get a fair job. A hull of smaller pieces—that is, straked planking—will build easier in this size boat for the average amateur. It will take longer, but the result will be stronger, fairer and somewhat heavier. This latter feature is an advantage in water that dances a bit. Of course, any boatbuilder who is mechanic enough can build this boat, planking her of plywood throughout. It is well here to mention to the novice that when a large panel of plywood, such as a topside, is both swept and twisted, the cross sections that result are not straight-lined sections. They have curve, arc, belly to them. Hence the framing of an accurate frame for a boat this size becomes a job for a skilled loftsman. The straight-framed job or a boat with a majority of straight frames, can be easily planked seam-batten style in strakes. Be warned that no design with a preponderance of straight frames can be planked with plywood. What you’ll get is a series of pillows between frames. Sure Mike II can be inboard powered. The Gray Model 620 would make an ideal installation. The Universal 60 hp Unimite would be another good choice of engine. A Chris Craft B, 60 hp, 133 cubic-inch motor would also turn in an extremely good performance. Red Wing also has a 60 hp 133 cubic-inch model that has well-engineered features. The insert elevation section shows enough of the inboard motor version to enable you to install the job.

11 pages, 5 plate(s)

Skimen Mimi (Pub. No. 5727)

by David D. Beach

LOA 16', BEAM 6' 6"

Designed for simplicity of construction, is Mimi, a flashy little lady at home in fast company. With the full souped-up power plant, Mimi will skid past the mile-a-minute mark. Her rugged oak frames and plywood planking are easy on the pocketbook and tough as nails.

The sporty looking runabout shown on the accompanying drawings has great appeal to the boat enthusiasts who desire both attractive appearance and a level of performance not normally found in small runabouts. It is the most recent design of a family of similar craft, which was started about ten years ago. Skimen Mimi is the fifth of her line, designed to provide the high-speed pleasure boatman with a husky sea-kindly craft capable of speeds that are the equal of the out-and-out racing runabout. It will be immediately obvious to the potential builder that there is nothing in her structure that speaks of difficult boatbuilding. Mimi was designed to take advantage of every money-saving expedient possible, consistent with established boatbuilding practice and safety afloat. There are no hard-to-cut and hard-to-seal rabbets on the stem or on the keel, as the plywood planking is simply laid on the beveled structure and fastened down with good marine glue and ample metal fastenings. If, on the basis of the plans provided here, you bave decided to build this craft, you must study the drawings in some detail. The builder will find detailed descriptions and informative drawings of the features of construction which are shown in conventional boatbuilding plan form here.

8 pages, 4 plate(s)

Robinson Crusoe (Pub. No. 5731)

by Weston Farmer

LOA 25' 7 1/4", BEAM 8',DRAFT 2 1/2', DISPLACEMENT 5340 POUNDS.

Here’s a boat for the skipper who wants a bottom that can take it. She’s a 26-foot, 16 mph, storm-taming sea skiff—a design proven in the white water of a New Jersey inlet. She draws only 21/2 feet.

It is surprising the number of letters I have received asking for plans of an economical, small cruiser of orthodox construction. It would appear that boat-wise watermen know that fuel costs money these days and that a fast boat, if used much, will soon chew up a lot of dollars. Also, these men all agree that it is very little more trouble to build a boat in the usual time-tried manner than it is to try to build to the limit of economy. Standard methods are best—the boat lives far longer. To meet the demand, I have designed Robinson Crusoe. This lightfooted, mediumweight cabin motorboat is 25 feet 7¼ inches overall by slightly more than 8-foot beam, and draws about 2½ feet under the skeg. She will weigh approximately 5340 pounds and will travel at 13-16 mph with from 50 to 72 hp. This makes her a nice compromise between economy and speed. A 50 hp engine will gulp less than half the fuel of a 100-horse motor, and the latter would give but a couple more miles an hour speed. I have chosen the over-all length as being about the minimum for a boat that doesn’t have to wait on weather. For a light-footed, easily driven hull, of tested sea-keeping ability, I’ve selected the true Jersey sea skiff bottom as developed along the middle Atlantic Coast from Sandy Hook to Cape May. These true sea skiffs always have hard bilges, flat buttocks aft, flat runs, flat floors and, usually, lapstrake or clinker planking. Now lapstrake planking of itself is no fair claim that the boat is a true sea skiff. One sees some boat companies building ordinary oversize round-bilged clinker launches these days; many of these hulls are not true sea skiffs. It takes really hard bilges and that good flat hind end, as developed by such famous skiff designers as E. Lockwood Haggas of Atlantic City to produce true sea skiff qualities. Robinson Crusoe has that Jersey sea skiff bottom as developed over generations along the Jersey coast. The arcuate raked stem, sometimes misnamed “clipper bow” (which is something entirely different) is a consideration to the current trend toward boats with beaks. If you don’t like the beak, run the stem rake up straight and the boat will look even more like a Jersey sea skiff. Aside from that, only a few points of arrangement are unusual. I’ve provided a bit more cabin space than is sometimes found in this type. It’s the kind you need cruising some wet morning or when anchored in a secluded cove. The Layout will sleep two easily, will feed several hands adequately for short periods and lends itself well to that informal disarray usual with spur-of-the-moment boating. Robinson Crusoe will be cheap to build, cheap to run and she'll behave buoyantly at good speeds in a chop, even when the weather blows up a lump.

6 pages, 4 plate(s)

Tintillee (Pub. No. 5732)

by Weston Farmer

LOA 18', BEAM  6' 4", DISPLACEMENT 2,198 POUNDS, DRAFT 12 3/4"

Hot off the drawing board is this saucy little steel 18-footer, designed for the man who would rather work metal than wood.

There are many good mechanics who do better working metal than wood. It is for this group of craftsmen that Tintillee was designed. Built of simple 12-gauge steel arc-welded to a simple bar and pipe frame, Tintillee’s construction follows the currently accepted methods of fabricating a welded steel hull. For the building of Tintillee here is the size welder you’ll need: for the 3/8-inch plates and bars, use 250 amperes at 45 volts. For the 3/16-inch side frames, use about 200 amperes at 35 volts. The 12-gauge plate (7/64-inch thick) will weld up properly at lower current, say 120 to 130 amperes and not more than 30 volts. Amperes is the quantity of current, volts is the pressure. These currents will produce the proper heats. Use shielded welding rod, obtainable at all welding supply stores and do all your work “down weld.” That is, have the weld under the arc. Reverse polarity will help feed the weld into the seam. Now about Tintillee herself: we have a simple V-bottom hull with the proper entrance and breast for an 18-footer which will drive from 10 to 16 miles an hour. Also, this shape will plate topside without billowing between frames. You will notice from the lines drawing where the fore body and aft body are shown in section that there is a dotted line on the forward frames. There will be a tendency of the forward plates to spring away from the frame. Let it. The inner 1” x 3/16” stringer bars can be sprung out to the skin, tackwelded, then welded to their slits to provide final welded security for the forward breast plates. Because welded steel construction is slightly heavier than wood—about 20 per cent in this size boat—one cannot expect much planing action. Rather, the boat is designed as a bangabout for rough service, and will do about 10 to 12 miles an hour with a 25 hp Universal Utility Four, about 12 to 13 miles with a Gray 33 Lugger, and will do about 16 miles with a Gray 6-72, which is about the top limit of economical powering.

6 pages, 6 plate(s)

17-Ft. Outboard Family Convertible (Pub. No. 5733)

by Bruce N. Crandall

LOA 17' 1', BEAM 6' 101/4", DISPLACEMENT 1493 LBS.

This one has everything! She’s small enough for trailering yet large enough for big power. And she’s plenty fast for skiing or offshore fishing.

This boat is a semiround bottom high-speed model designed for planing speeds with one or two outboard motors. It will serve equally well as a runabout, a cruiser or an offshore fishing boat. The bottom lines and the arrangement are both primarily designed for rough-water use. The bottom is designed for safety and soft riding in as rough water as a boat of this size should be used. The arrangement is such that the weight is carried far enough aft so that the hull will ride high enough to be safe and dry, and still the passengers can ride forward behind the protection of the windshield and out of the spray. This is an ideal boat for weekend cruises or fishing trips, especially when transportation by trailer is called for. It is a fine-size family boat, is large enough to swim and dive from, and will pull water skiers at good speeds when motors of 40 hp and up are used. Although the position of the forward seats should not be changed from the location shown on the plans, the after part of the cockpit can be arranged as desired according to whether the boat is to be rigged primarily tor fishing, cruising, water skiing or just plain family boating. The bunks under the forward deck, and the convertible top, are of course optional. A hull form of this design and size is suitable for use on all sorts of waterways, from small rivers and lakes to large lakes and open bays, and it may even be used with caution on the open ocean in many localities. For offshore use twin motor installation is of course advisable. The bottom is of the semi-round or convex-V bottom type which makes for soft riding and good banking qualities at high speeds. It is an ideal boat for use on long cruising trips where many kinds of waterways will be met.
This design represents the culmination of five years of attempting to evolve an all-round craft suitable for most boaters.

8 pages, 5 plate(s)

Make a "Throwaway" Duck Boat (Pub. No. 5734)

by V. Lee Oertle


No thing of beauty is this little bucket--she's all practicality. But you will never beat her price tag, and she's tops as a one-man duck or pond fishing boat.

Like to have a small duckboat that will fit in your station wagon or pickup truck, will float in bare inches of water, weigh less than 50 pounds—and can be built cheap enough to throw away at the end of the season? It is so simple to construct that the only tools needed are a hammer, saw, wood rasp, two wood clamps and a screw driver. The entire project can be completed in less than four hours’ working time. By no stretch of the imagination could this little hunter’s friend be used on rough waters, on the high seas, or with a twin-lung kicker on the back. But with a beefed-up transom and knee brace, it’s my opinion that a 1% hp or 2 hp outboard, handled by an intelligent operator, would be safe. I’ve paddled literally miles in this tough little go-getter, bumped over logs, rocks, dragged it across sand bars and up on gravelly beaches, with no worse damage to the hull than ugly scratches. (My boat has a fiber-glass bottom, explained later.)At the end of the season, do as I do: Haul it out to your favorite offshore hunting spot and make a permanent blind out of it by nailing slats and camouflage to it. A couple loads of buckshot in the bottom will make sure that no one is tempted to drag it away. Next year, build another—after all, it’s only $12.48. Pro-rate this out for an average season of four trips, and you spend about $3 per week end used..

8 pages, 1 plate(s)

17-Ft. High-Speed Outboard Cruiser (Pub. No. 5736)

by Bruce N. Crandall

LOA 17' 1", BEAM 6' 11 1/2", DRAFT 8 3/4", DISPLACEMENT 1670 LBS.

Shopping for something in the 40 mph class that still offers big-boat comfort? This is for you.

This is a semi-round bottom, high-speed model designed for planing speeds with one or two outboard motors. Outboard cruisers, like any small boats, fall into two classifications: those designed as displacement boats and those designed to plane. The displacement types up to 22’ or more in length are generally quite satisfactory for motors from 10 hp to 25 hp. The planing types, especially the larger cruisers, often require too much horsepower to make them plane properly, especially when there is a load aboard. A boat which will not quite plane is always very unsatisfactory and inefficient to operate. There are some types of bottom design which are suited for semi-planing speeds or slow-planing speeds, but these cannot be built of sheet plywood. While a developable-surface design such as this one is not as efficient at slow-planing speeds as some types, at somewhat higher speeds it becomes the most efficient, and therefore the fastest, of all equally soft-riding planing types. A boat this size attains planing speed at between 18 and 20 mph, and between 26 and 28 mph this design reaches its best efficiency. Now, with a similar boat just two feet longer, minimum planing speed would be one mph higher, and the speed for best efficiency about 1½ mph higher, which illustrates the great increase in power necessary for equal performance as the boat gets larger and heavier. So, you can see, this 17’ cruiser is the ideal size for attaining maximum speed without undue expense for motors and fuel. The hull design is suitable for planing speeds in choppy or even comparatively rough water with motors from 25 hp to 60 hp. Even more power can be used in calm water if greatest speed is desired. This boat is ideal for week-end cruises or fishing trips, especially when transportation by trailer is necessary. It is not heavy enough to make launching from a modern trailer or loading up again at all difficult. The bottom, sides and even the cabin top are designed on developable surfaces to make planking with sheet plywood easy. The bottom is of the semi-round or convex V-bottom type, which makes for soft-riding and good banking qualities at high speed. The entire hull is designed with rough-water use a primary consideration, and it is as seaworthy as any boat of its size can be.

14 pages, 6 plate(s)

24-Ft. Outboard River Cruiser (Pub. No. 5737)

by David D. Beach

LOA 23' 11" BEAM 8', DRAFT APPROX. 17"

Shore comfort afloat for you and your family is possible with this cruising houseboat. Plywood construction makes this design super-simple. One 25 hp motor pushes her

VOYAGEUR! The name that was given the early explorers of our inland lakes and waterways brings forth a picture of intrepid wanderers who pushed the boundaries of our land westward in the 1600’s. No doubt the shades of Joliet, LaSalle, Champlain and Marquette are amazed by the developments along the free-flowing waters they first traveled. Many of the mighty rivers have been tamed by locked dams, and thousands of miles of new waterways exist where present-day yachtsmen enjoy speeds and comforts undreamed of by those doughty paddlers of birchbark canoes. And so, to continue the progress, here is a new design for today’s boating enthusiast. Voyageur is a lot of ideas rolled into one smallish package. It is family boating; it is leisurely cruising; it is comfort afloat, with economy of construction, It can be a plain craft of easy upkeep, or it can be built in the tradition of varnish and polished metal, to suit the tastes of the builder or owner.

12 pages, 5 plate(s)

11.5-Foot Utility Outboard (Pub. No. 5739)

by Bruce N. Crandall

LOA 11' 41/2", BEAM 56", DRAFT 17 1/2", DISPLACEMENT 716 LBS.

Lightness extends this utility’s cruising range as far as an auto-top can take her. She handles motors to 20 HP.

This is a type of hull design suitable for many uses where an easily transported boat is needed. It is an ideal fishing boat for use in relatively protected waterways, and is quite efficient at planing or semi-planing speeds with 5 hp and 6 hp motors; while at the other extreme it may be driven at high speed even in rather rough water with motors up to 20 hp. The hull is a developable-surface design, primarily for planing speeds in choppy water, and though it is somewhat faster it resembles a round-bottom planing hull both in appearance and performance, as it banks beautifully on turns and is quite soft riding. Easy riding and safety at high speeds were the primary considerations in the designing. For use with motors of 10 hp and over, a steering wheel should be used, mounted aft approximately at the location shown in the construction plan; and for high-speed operation the seats should be so arranged that the driver sits almost on the bottom. The high seats shown in the construction plan are for fishing or rowing position and are not suitable for high-speed use. The optional keel, 1¼” to 1%” deep, will serve to prevent any skidding on turns at high speed and is not necessary with motors under 10 hp. A small fin located at Station 6 may be used for high speeds, instead of the deeper keel. The boat is suitable for forward steering with motors of less than 8 hp only. Various types of seating and deck arrangements are practical with this hull, such as double-cockpit arrangements of various sorts.

8 pages, 2 plate(s)

18-Ft. Offshore Fisherman (Pub. No. 5741)

by David D. Beach

LOA 18' 1 3/4", BEAM 7.

Easy-building plywood tailors Tunny to the blue-water angler. She’ll return maximum safety for minimum cost

The finny denizens of the briny I deep inspired the design shown on the pages of this article. “Tunny” is the fisherman’s name for the tuna, the far-ranging wanderer of the oceans whose beautiful form makes either an excellent trophy or a delicious meal. Often found well within the cruising range of this boat, they are the basis of a widespread sports fishing activity from Cat Cay in the Bahamas up the Atlantic Coast to Wedgeport, Nova Scotia. Enthusiasts pursue them in all types of craft, and it is not at all unlikely that many outboard-powered craft like Tunny will soon join the fleets of the big-game sports fishermen. Tunny need not, however, be built solely for the pursuit of game fish, as the basic boat is the type becoming more and more popular for day cruising and for general fun afloat. The removal of the little king post, the outriggers and the swivel chairs makes a big after cockpit available for swimming gear, ski equipment or folding furniture to suit. As can be seen on the lines plan, Tunny is an 18-footer with a beam of a bit over 7’, and ample freeboard fore and aft. The freeboard was selected to make a spray-free boat and to provide for a full hatch over the twin 35 hp motors which will drive the boat at a full 27 to 28 statute miles per hour when loaded with four adults and four tanks of fuel.
The deck is raised a bit forward to rovide a pleasing proffle and to give a measure of protection against the weather. While a long side screen is shown, the boat may be fitted with a shorter side screen for the windsield, or a large plastic wraparound windshield can be installed. The boat is characterized by a full-length flare which makes the deck edge the widest part of the boat throughout. The well-rounded V-sections forward, for plywood planking, are derived from a series of very successful predecessors, all of which have proven to be exceptionally seaworthy and seakindly. The planing bottom is a full 6’ across the chines, which provides an ample load-carrying area for the thrust of motors up to a total of about 80 hp. As shown on the body-plan section of the lines plan, the transom is designed for a twin-motor cutout, for motors to be used on the standard 15” transom. Of course, longer motors can be used, but they will project above the deck line.

11 pages, 4 plate(s)

Inboard or Outboard Camper, An (Pub. No. 5742)

by Edson I. Schock

LOA 21', BEAM 7' 2", DRAFT 15"

Either way, this 21-footer is ideal for the week-end or overnight cruise.

This little motorboat is too small to be a real cruiser, although many long cruises have been successfully completed in boats as small as this one. She is more like a temporary camp. There is shelter for two persons for a night or two, with food storage spare and a simple cook stove. There is space for toilet facilities. She can be driven at high speed in proper weather. Two construction plans are shown: one for an inboard, the other for an outboard engine. The boat can be built either way, the difference being only in the engine beds and keel. The outboard motor construction plan shows the general hull construction, which is the same as for inboard power. The inboard engine construction plan does not repeat this detail, but shows instead the cabin arrangement, the inboard engine beds, shaft log and keel.

17 pages, 3 plate(s)

Trumpet (Pub. No. 5743)

by Weston Farmer

LOA17' 11", BEAM 6' 6', DISPLACEMENT 1,635 LBS.

A revolutionary new handling of an old principle makes this design the one for the skipper who demands the ultimate in boat performance

This beautiful-running little boat is named Trumpet. Shown here powered with a Mercury Mark 55 40 hp motor, turning an 11” x 11” propeller at 3,000 rpm (motor 5,000 rpm), she is making a measured 24 mph with slip at 15 per cent. This is on an all-up weight of 1,635 pounds, or more than 40 pounds per horsepower. Note her very fiat, sprayless wake. Her freeboard forward is 33%”, and aft it is 26 ¼” at the transom-sheer junction. Trumpet more nearly approaches a boat of normal form than do four-sided sharpened mortar boxes, hence she is very soft in a seaway, rises bodily throughout her running range without appreciably changing trim. She turns like a pony, yet tracks course like an express train. She was built to my lines here for John W. Rollinson, Jr., of St. Simon’s Island, Georgia, by George Stevens to prove some ideas both Mr. Rollinson and I had about seagoing planing hulls. The dope says she’d have to weigh 400 pounds less, or have 50 horses to produce 24 mph. Cross-checks of these figures with appropriately lighter loads have produced speeds of 26.5 to 27 mph. She is therefore about 25 per cent more efficient than the average—a marked increase in general ability. This is due to decalage in her running lines, particularly her keel, which applies to a hydroplaning surface a portion of the general principles of laminar flow found in airplanes with a “Coke bottle” fuselage. This “decalage” (deck’-a-lage to rhyme with garage) is a French engineering term which refers to different angles of incidence in the lift members of a plane, disposed in such a way as to produce inherent fore and aft trim components.

15 pages, 3 plate(s)

Offshore Outboard (Pub. No. 5745)

by Bruce N. Crandall

LOA 21', BEAM7' 11",DRAFT 10 1/2", DISPLACEMENT 1280 LBS.

Here’s a 21-footer designed for high speeds in rough water. Plywood construction makes her easy to build.

This is a semiround bottom, high-speed model designed for use on waterways which are too large and open to be safe with the average-sized outboard boat. While a developable-surface design such as this one is not as efficient at low planing speeds as some other types of bottom design, at somewhat higher planing speeds it becomes the most efficient, and in other words the fastest, of all equally soft-riding planing types. A boat of this size will attain planing speed between 19 and 21 mph, and at 29 mph and over this design is at its best efficiency. The hull is designed for planing speeds in rough or quite choppy water with motors up to over 100 hp. About 40 hp will be necessary to make the boat plane with a light load, and with 60 to 70 hp it will begin to reach its most efficient planing speeds. It will be noticed from the construction plan that there are a great many frames and bottom battens. The framework is extremely strong and forms such a good backing for the plywood that the boat will be able to stand the pounding of any amount of rough water as well as the roughest sort of trailer travel. Of course there is a lot of tedious work to laying out and cutting to shape so many frames but it is well worthwhile from the standpoint of strength as it results in the strongest and lightest type of construction. Equal strength could not be attained without the use of such closely spaced frames and battens unless plywood thicker than 3/8“ were used, and such plywood is virtually impossible for the amateur to handle in large sheets.

14 pages, 3 plate(s)

Little Harbour Putt-About (Pub. No. 5746)

by David D. Beach

LOA 12' 6", BEAM 5' 1/4".

She's far from the fastest thing afloat, but she has style and class and is safe for the youngsters. Build her in your cellar--it's easy.

The little inboard that’s pictured here had its beginning in the years immediately after World War II. The author made plans for a smallish craft to be used in a rental business on Miami’s Biscayne Bay. A fleet of these were constructed in one of the small boat shops along the Miami River, and for a number of years the waters between Miami and Miami Beach resounded to the putt-putt-putt of the little air-cooled engines which were the    power plants for this flotilla. Later, the second design in the family was prepared, along the same lines as the earlier one. This later design was the same length as the present one, but the engine was mounted amidships forward of the cockpit, which was just forward of the transom. The second design had a more refined plywood shape, but had the same major disadvantage—the engine location made for a noisy boat to the occupants. Finally, in considering potential designs, a thought occurred to the designer that perhaps a new version of the concept might meet with some national enthusiasm. The reasons for this thought are several, and varied. There are many small bodies of water where high-powered or larger craft would be senseless, as there would be neither area nor length of course to let them run at speed for more than a few minutes. There are also many lakes and river basins where horsepower is limited by local ordinance or regulation. There are a good number of younger boating enthusiasts who want a really impressive boat which would not arouse in the minds of their parents undue fear or concern over its operation. Finally, there probably is a large group of parents who would hesitate to buy a high-powered family boat, but who would not hesitate to obtain a modest or low powered craft for the express use of the junior members of the family.

8 pages, 4 plate(s)

Cruising Skiff (Pub. No. 5747)

by Edson I. Schock

LOA 24, 8' 8", DRAFT 2'

Packed neatly into these 24 feet are two bunks, galley and enclosed head. This salty little packet is flat bottomed for supereasy building and low, low cost. This boat was designed to be easy to build. Dimensions were selected to use stock sizes of lumber to advantage in order to keep the cost down. A flat-bottom skiff seemed the simplest form of hull, and was chosen for this reason. The flat-bottom skiff has advantages and disadvantages. In rough water she may pound, so a hull of this type does its best work in protected waters. The waves of a passing boat cause her to slap when at anchor. She has a quick roll in a seaway. These are disadvantages. On the other hand, she has an amazing amount of room in the cabin for such a small vessel. The floor space amidships is 4’ x 4½’, with full headroom and a flat floor. If you have the bad luck to run aground, she will sit comfortably on the mud until the tide comes in (assuming you have the good judgment to go aground at low tide) and will not tip more than 14° or thereabouts. She can be loaded on a trailer easier than would be the case with a round- or V-bottom boat. It is easy to set her up ashore for the winter. If you are looking for speed, she does not have it. This hull will not plane. Adding power will just make bigger waves and bigger gasoline bills.

23 pages, 5 plate(s)

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