Outboard Powered Runabouts, Launches  


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Shore Lark--A Speedy 13 Foot Runabout (Pub. No. 5566)

Fast, safe, and seaworthy on almost any waters, this general utility runabout will afford long happy hours of sport and repay its construction many times. Adapted to the use of outboard motors from 1 to 24 hp., the utility runabout will plane safely, at speeds from 5 to 45 mph and easily carry four or five persons depending upon its power. Designed to elminate difficult joiner work, the “Shore Lark” is easy to build and presents a lightweight sturdy hull that one can build for a fraction of the amount he would have to pay for a finished boat of this type.

12 pages, 1 plate(s)

Torpedo--A 13 ft Super Runabout (Pub. No. 5612)

by William Jackson

"Torpedo" could almost be called a diminutive, peace-purposed PT boat, so unusual and outstanding are its appearance, design and performance. Indeed, in proportion to its size and weight it can outspeed and outmaneuver that most renowned of small combat craft to stem from World War II. Any outboard motor of from 10 to 30 h.p. may be used, and with the more powerful engines "Torpedo's" speed becomes breathtaking. Streamlining above water gives a sleek look and cuts down air resistance, while the non-tripping chines and molded bottom are adapted to plywood construction.

12 pages, 2 plate(s)

15-Ft. High-Speed Outboard Runabout (Pub. No. 5675)

by Bruce Crandall

At last—a hull designed for up-front operation. She’s safer, with plenty of beam, and speeds up to 34 mph

An outboard boat for forward steering must be designed (as are most inboard runabouts) with some fore-and-aft curvature in the planing surface, or must be considerably wider forward or narrower aft than the average outboard design. From a glance at the lines plan of this design it will be obvious that the beam admidship at the chine is much greater than in conventional designs and that the planing surface narrows down somewhat aft.  As outboard boats go, this is a quite large boat for a 15-footer, with 28” depth amidship, enough to make good headroom with a convertible top, and almost 7’ beam, about the greatest of any 15-footer available. The great beam serves the double purpose of making the boat safe at high speed and also large and stable enough for a twin outboard installation. The exceptional flare aft eliminates the possibility of the chine tripping as well as would a conventional beveled chine. This simplifies the construction somewhat. There is plenty of buoyancy and stability to carry up to five persons in perfect safety under ordinary conditions.

16 pages, 3 plate(s)

Baby Killdeer--A 12 ft Plywood Runabout (Pub. No. 5677)

by Weston Farmer

Convenient  in size for easy trailing is "Baby Killdeer", just under 12’ long and with about 57” of beam. Weighing in the neighborhood of 150 pounds, she can nicely handle motors of 6 and 7 hp, and won’t shy at 15 hp. She is too small for the 25 hp mills, as she is really a very small boat. With two people aboard (and this is quite a load, poundwjse, for any 12-footer) and with a 10 hp Mercury, she can do about 22 mph. For her length, this seems rocket sneed.

8 pages, 3 plate(s)

Warrier A 15-Ft. Ouboard Runabout (Pub. No. 5684)

by William Futrell

"Warrier" is a high-performing runabout of the popular walk-through deck, two-seat type. The bottom design makes it especially suitable for water skiing. Enough deadrise has been permitted in the bottom section to let her heel comfortably in tight turns. Toward the bow the bottom is V’d sharply to permit smooth riding in choppy water. The sheer has been flared sharply to keep the passengers dry and comfortable. Warrior is an easy boat to build. Even the first-time builder will have no trouble with this design, and the professional will find a real pleasure in building it.

16 pages, 2 plate(s)

Ellen Ann--A Fast 10-Ft. Runabout (Pub. No. 5690)

(Small enough to be a really cool dinghy!)

by George and Robert Schleier

On one of those long, cold winter nights when one reminisces, thoughts of summer can bring on a discussion—with us, it’s boats. A 13-year-old youngster sounded off one night regarding his ideas on an ideal “small boat” Putting his ideas down on paper and polishing off the rough edges gave us this 10 footer—”Ellen Ann.” For an all-purpose boat, she is fast. Using a 7-8 hp outboard, she will plane at an honest 18 mph, carrying a 125-pound “pilot.” With 15 horses, she’ll move the same weight along at 24 mph. She’ll ski one 125-pound youngster with only 7-8 lip, with a 125-pound “pilot.” Cartopping is a snap, and sharp turns can safely be made within a boat-length. Suitable for dinghy service, she’ll do very well as a “fisher” if you don’t crowd more than two aboard. For inclement weather, a detachable, folding windshield will give ample protection against the elements. A hatch in the foredeck allows convenient stowage of ground tackle.

12 pages, 1 plate(s)

Little Bubble--Nine feet of Runabout Fun (Pub. No. 5696)

by Hank Clark

There are 130 pounds of darting delight in only nine feet of boat. And so simple to build. Designed at first only to turn loose two of the crew of "Barnaby" (described earlier in this page) it was to be light for car topping, and just something to be independent in. As construction went along, we put some beef here and there, and today, after a whole season, we find we’ve built a bomb! Linda 16, and Carol or Bub now have a real “rod” complete with 10 hp Evinrude Sportwin, remote controls, Voilrath racing steerer, 6-gallon (could be 4-gallon) tank, cushions, paddle and lines. The same rig could be a father/son project, or teen-team effort for kicks, camping, or plain joy on the water. This is not a hydro. It’s only a little over 9 feet, a midget runabout with semi-round bottom that affords soft ride, yet flies around with a hydro’s performance. It paces our cruiser at its 24 mph clip, with two aboard, safely cresting most waters of lakes, rivers and bays. But here’s the hottest news of alL It pulls a 150-pound skier! Or two tots! Tie that! Long mahogany fins are rakish, and are transom braces, and fence against sloshing water. Wheel column is seat back, and allows astride sitting or kneeling, folding for car-topping. Round bow makes for easy building, gives some “deck” area, and imparts more bottom area to support the passenger in so small a craft. No spray rails. Raked sides keep cockpit dry. A 5 hp motor was first used, putting out 17 mph. But with 10 hp on, you fly.

16 pages, 2 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)

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)

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)

13-Ft High-Speed Outboard Runabout (Pub. No. 5755)

by Bruce N. Crandall

LOA 13', BEAM 71 1/2", DRAFT 7", DISPLACEMENT 780 LBS.

This is an ideal design for the amateur builder who wants a modern family runabout at the lowest possible cost.

Here is about the smallest outboard runabout suitable for family use on our waterways today. It is a convex-V bottom developable-surface model designed for ease and economy of construction with sheet plywood and for highest speed consistent with comfort and the ability to drive from a forward position. The boat is large enough for average use on small lakes, rivers and bays where the water does not get too rough for high speeds. Water skiing, fishing and family fun riding are the principal uses for which it is designed. As the beam is much greater than on the average 13-footer, the boat can carry up to four adults safely if the water is not too rough. Safety at high speeds has in no way been sacrificed for top speed as the convex-V bottom has ideal banking characteristics and the flared sides aft eliminate the possibility of chine tripping just as well as conventional beveled chines do. A convex-V bottom hull of this size will plane at from 16 to 18 mph but attains its best efficiency at 23 mph and over, so for average use a motor of from 25 hp to 40 hp is recommended.

12 pages, 4 plate(s)

9-Ft. Outboard Speedster (Pub. No. 5762)

by Bruce N. Crandall

LOA 9' 41/2", BEAM 56 1/2", DRAFT 5 1/4", DISPLACEMENT 350 LBS.

A safe miniature runabout for highest possible speeds with small outboard motors. This is a boat which will set the pace for youngest sportsmen.

I designed this speedster with the express idea of creating a boat both fast and extremely safe for use by the younger generation on our waterways of today. The type of bottom design is not new but is adapted from those used in a series of similar designs and on outboard racing runabouts of my design which have in the past established many world records. Though the bottom design (the running surface, that is) is not new, there are other aspects of the design which are quite different from previous boats of this type. The beam of the running surface is 3’ 2” and the over-all beam of the boat is 4’ 8½” or just over half the overall length. The beam in itself is a safety factor, but most important is the nontrip effect of the bevel chines in combination with the flared sides, which allows the safest possible high-speed turns. The sides are also high enough so that the driver can sit comfortably at the steering wheel, behind a windshield if desired. The hull has been designed on developable surfaces so that marine plywood can be used to make the construction practical and easy for home boatbuilders.

15 pages, 4 plate(s)

15 Ft. Outboard Runabout (Pub. No. 5798)

by Bruce N. Crandall

Semiround-bottom design tends to bank this speedster into large oncoming waves not met head-on. So for long trips at high speeds with minimum pounding I suggest you try this.

This is an extra-deep and extra-beamy, semiround-bottom model designed for as safe and smooth a ride as possible at high speed in rough or choppy water. Because the outboard motors of today are both more powerful and more dependable than their predecessors, most outboarders are taking longer trips at higher speeds than ever before. As larger waters are tackled, the persistent problem of riding heavy chops at planing speeds becomes more and more important. Even our most protected waterways become rough from boat wakes alone. It is, of course, not possible to eliminate completely pounding from any planing boat, but many of my previous semiround-bottom, developable-surface designs have proved that they can give a smooth ride at high planing speeds into a considerable chop. With the aid of the experiences I have had with these previous boats, I designed this one to do it even better. It has a deeper round than the previous models, carried all the way aft, so that there is no flat surface to receive a solid shock. To go along with the soft-riding bottom there is extra beam, large, beveled chines, larger spray rails, somewhat deeper keel, and considerable flare carried all the way aft. The soft riding is accomplished without the aid of a deep, sharp forefoot which can smooth out small waves but is a dangerous thing at best in a high- speed planing boat because it will act as an uncontrolled bow rudder and jerk the boat in exactly the wrong direction on meeting oncoming waves. The type of bottom used on this boat will instead tend to bank into any large oncoming wave not met exactly head-on; this is a safety factor, improving steering in rough going.

18 pages, 4 plate(s)

How to Build Morgiana (Pub. No. 5807)

by David D. Beach

Boat designer=eclectic—i.e., one who selects the best of many good ideas and makes them work, in something unique.

The boatbuilding business, and especially the designing of boats for that industry, is full of thieves! Every designer steals ideas from other boats he sees in the publications he reads or at the shows he attends. Of course, a lot of ideas are worth using, and they can all be improved on. The 20-footer shown on the drawings that accompany this text is full of design ideas. None of them are really new, but none of them are so old that they’ve become commonplace. Some are presently in existence, some have appeared in little custom designs and some have been lifted out of other amateur-construction articles. However, what makes this boat different is that, to the best of this designer’s knowledge, the ideas have never been collected in quite this way before. Which brings us to the reason for the name. If you remember your Arabian Nights, you’ll recall the girl who disposed of the 40 thieves for Ali Baba and helped protect his secret. I rather doubt that I’ll need protection from those boatbuilders and designers whose ideas I’ve incorporated in this design, but just in case, I’ll name the boat after that girl. So: Morgiana! Now that the design is identified, we can discuss her features and how to build her. First, let us look at the Outboard Plan and Profile. The distinctive feature of Morgiana is her novel windshield profile. This is vee’d forward and has long side wings to provide a really adequate amount of protection from wind and rain. Spray from her bow wave will not be a problem, as she has been given substantial freeboard. The windshield side wings lap on the cockpit coaming, which runs all the way aft, standing proud of the deck a full 4”. The plan view shows there is a large cockpit, with a pair of seats for the helmsman and his companion, well sheltered. Some of the little “goodies” indicated on the arrangement will be discussed as we go on.

8 pages, 4 plate(s)

17 Ft. High-Speed Outboard (Pub. No. 5809)

by Bruce N. Crandall

Your teeth don’t rattle and your bones don’t jar when you throttle up this multipurpose speedster with a soft-riding bottom.

This is an extra-large, beamy 17’ outboard boat designed for high-speed use with large motors and heavy loads on many kinds of waterways. It is called a convertible, because it is big and stable enough for all-weather use with a convertible top and because it is suitable for many varying uses. It will serve well as a runabout, a camping cruiser or an offshore fishing boat. This is an ideal boat for weekend fishing trips or cruises, especially when transportation by trailer is necessary. It is a fine-size family boat, is large and steady enough to swim and dive from and will pull water skiers well with 40 hp or more. The arrangement is such that the weight is carried sufficiently far aft to make the hull ride high enough to be safe and dry, yet passengers can ride forward behind the protection of the windshield. 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 fitted out primarily for fishing, cruising, water skiing skin diving or just plain family boating. The arrangement shown is suitable for cruising as well as many other uses. The aft seats are 6’ long and can be used as bunks. The bunks under the forward deck and convertible top are optional.

12 pages, 6 plate(s)

Thunderbolt--A 13' 8" Outboard Speedboat (Pub. No. 5814)

by Wm D Jackson

Thunderbolt was designed for high speed operation, to be powered with outboard motors ranging from 15 to 50 H.P.

With its stepped bottom and wide convex after plane it will propel with correspondingly greater speeds as the power is increased. If the largest outboard motor available—the Evinrude Big Four, rated at 50 H.P.—is used upon Thunderbolt, four passengers can be planed at a breathless speed and with one person aboad Thunderbolt powered with this motor the speed can approach the 60 M.P.H. nark. Trim and able design makes Thunderbolt fast, sporty, and safe with one or four passengers abroad. The hull banks on turns nicely and due to its new but fully tested bottom design, it can travel faster than any comparable boat design in existence, Thunderbolt under trial with various motors was found to handle quite well over rough or smooth water riding somewhat softer than ordinary planing boats. This is due in part to the deep forward plane that eases the boat over waves while the larger after plane handles any motor from the smaller 15 H.P. models up to and including the Big Four rated conservatively at 50 H.P. The specifications of Thunderbolt show it to be a capacious hull 13’ 8” in length with a beam slightly over 5’. The completed weight of this hull will approximate 275 lbs. and will comfortably seat five persons. The plans give details for easily made attractive seats and backs that gives Thunderbolt unusually comfortable passenger accommodations. This trim and sporty craft may be built in the homeworkshop and Thunderbolt was thoroughly tested by the designer with motors varying from 18 to 50 H.P., the speeds ranging from 15 to 60 M.P.H. Everything in the design has been proved and is offered to the prospective builder as a step ahead of anything on the market.

17 pages, 2 plate(s)

Outboard Racing Runabout (Pub. No. 5851)

Designed by William F. Crosby

LOA 13 ft., BEAM 5 ft.

The idea that we are presenting at this time is not a new one to the sailboatmg fraternity but it certainly has not been broached to the outboard drivers so far as we know. Briefly, it is the suggested plan for a one-design outboard race class and by one-design we mean just that--all boats exactly alike and the engines as closely alike as they can be made. As a one-design class it means that the boats must be built like the plans and like the lines. Waterproof plywood is specified for the outside and therefore you can't plank it of mahogany, cedar or some other wood but must use the plywood indicated and in the size shown. Frames, stringers, keel and all other members must be made as closely to the plans as possible. The deck, cockpit arrangements and all other parts must be like the plans. You can't use a canvas deck. All this may sound a bit rough, and possibly some of you will remark that with racing of this type there can be little or no progress. Such is not the case, because there is still plenty of room for development among the open classes, the one-design being proposed for those who are tired of trying to keep up with the open classes. If one-design outboards can be developed along these lines, there is no reason why you could not get several seasons of practical use and racing from the same outfit. Something that is rather impossible today in the open classes. The idea of one-design racing has been so successful in the sailboat field that there is absolutely no reason why the same thing could not be done in the power boats. The inboard Pacific Coast One-design class has spread from coast to coast and its rules and restrictions are based exactly on sailing one-design class rules. It can be accomplished even more easily in the outboard race field and consequently this plan has been developed in the hope that some of you may become sufficiently interested to get the thing started. The boat complies with the outboard runabout rules of the National Outboard Assotiation both in minimum dimensions and weight so even if you do not race as a one-design class, you still can race with the runabouts. She is designed for a class C motor-20 to 30 cubic inches piston displacement-and while we are not making any predictions as to speed, those who are supposed to know, state that this hull with a proper racing motor would give a good account of itself anywhere. The wooden deck has been added, not for walking purposes, but to add strength to the hull and to prevent its opening up. Non-tripping chines will make her turn better and will make the boat safer. The cockpit is arranged for one person but the wheel may be shifted to one side and two may be seated in comfort.

8 pages, 2 plate(s)

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