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El Cid--Mini inboard Hydro (Pub. No. 5065)

"El Cid" is a mini inboard hydro that’s powered with a 4 H.P. air-cooled engine. Its top speed is about 16 mph with a 100 lb. teenager aboard. It features a “dead man’s” throttle that shuts the motor off when the driver lets go of the throttle, so there’s no danger if the operator falls off the boat. Safe enough for a young person, it’s a great little boat to start out on. Use is limited to well-proteqted waters, of course.

12 pages, 2 plate(s)

$7.95
Hydro-Kart--A 3 Pt Hydro-Dual Kart Engines, The (Pub. No. 5299)

by William Jackson and Wayne Ison

In one week’s spore time, you can build this 50-mph competition-type hull. Powered by those air-cooled high-speed engines, it offers a new thrill afloat.
Have you been wondering what it would be like to run your kart engines on a small three-pointer at top speed with so little of the boat in the water the sensation is that of flying? Here’s your opportunity to get in on karting fun afloat. If your goal is competition, you’ll want to keep the weight of your "Hydro-Kart" below 100 lbs. The best way to do this is to use l/8 mahogany plywood over spruce framing with bronze or monel fastenings. For economy, however, you can use fir exterior plywood and galvanized fastenings which may put you just over the 100lb. mark, but will not noticeably affect nerformance.

8 pages, 4 plate(s)

$7.95
Skua--An 8-Foot All Plywood Outboard Skimmer (Pub. No. 7061)

Designed by Charles G. MacGregor

LOA 7 ft. 9 in., BEAM 3 ft. 10 in.

To those who love the thrills of speed on water we submit here a small outboard skimmer which if carefully built will give her owner a great deal of pleasure. There is a splendid choice of suitable outboard engines developing 3 to 30 hp. Most of these motors run efficiently at speeds between 3,500 and 4,000 r.p.m. and as high as 5,000. It is not necessary to use a steering wheel but it is a great convenience. Keep the tiller lines well clear of the open cockpit so that they will not be in the way when turning from cranking to steering position. The seat should be arranged to suit your own needs or eliminated

4 page(s)

$3.50
Flash--A Fast Outboard (Pub. No. 5382)

Designed by C. A. Nedwidek

A speedy little hydroplane adapted to class B and C engines simply designed and easy to build.

Small outboard engined hydroplanes are in great demand among the coming generation of yachtsmen. Speed is what they want and they will be content with nothing but the fastest boats. Our design is for a smart little hydroplane adapted to Class B and C engines. It is not suited to the larger engines and would require the addition of squatboards on the hull aft to provide increased planing area. The construction has been kept as simple as possible so that no difficulties should be encountered in the work. A great deal of pleasure and recreation will be derived from the work of building this little job.

4 pages, 2 plate(s)

$6.95
Flyer--A 135 Cu. In. Class Hydroplane (Pub. No. 5415)

by Willard Crandall

Designed by Bruce N. Crandall

Absolute maximum speed, is the cry of many race drivers. For a race, they want a boat that will go fast--sufficiently fast to win; and if it will, other features of it do not matter. The 135-Class Flyer is designed to give maximum speed, but maximum speed under normal competitive conditions. Factors of design giving straight-away speed, turning ability, and ability to ride rough water have been so proportioned that in an actual race a high peak of speed is reached. As can be seen from the profile drawing, a perfect stream-ling has been achieved. The 135-Class Flyer has been designed on the principle of carrying most of the weight on the foreplane, so that a wide afterplane is not necessary. While length and beam are somewhat over the minimum prescribed, because of its shape it is, really, a small boat. Construction is much more simple than it might appear offhand. The pointed stern is built similar to an upside down bow. The transom is used the same as ever, and serves as an additional bulkhead. No rabbeting, except in the stem, is required. The type of construction called for is about as light as is practical considering the strength necessary and it is not advisable to build the boat lighter.

9 pages, 3 plate(s)

$7.95
Build this Miniature 3-Pt. Hydroplane (Pub. No. 5459)

by Hal Admonson

How about an exciting new, easy-to-build boat for the younger set? This sharply-styled 9-ft. 3-pt. suspension miniature hydroplane designed by Hal Adamson is unsinkable because of its Plyfoam and fiberglass construcitonk weighs only 68 lbs., and will do about 25 mph owered by a remote-controlled 6-hp outboard.

8 pages, 2 plate(s)

$7.95
Building Popular Flyer A Racing Hydroplane (Pub. No. 5556)

Speed is the outstanding feature of the  “Popular Flyer,” which was designed and built  along the same lines as the trophy-winning models. Every step in the construction of the boat is clearly shown so that you will have no difficulty in building a similar one. The craft may be built of cypress, mahogany or Washington red cedar.

16 pages, 3 plate(s)

$8.95
Building Rocket--A 15 Foot Inboard Hydroplane (Pub. No. 5557)

by William D. Jackson, N.A.

The “Rocket” is a boat designed for those who like their boats fast and sporty but still inexpensive to build and operate.  Any motor, with or without reverse gear, will power the “Rocket.” Auto motors that develop more than 35 horsepower, if of light weight, high speed design, will do nicely. Marine motors of similar high speed, light weight design will perform even better.

8 pages, 2 plate(s)

$7.95
Dragonfly--10 Foot Outboard Hydroplane (Pub. No. 5558)

"Dragonfly” is a hydroplane that is adapted to all classes of outboard motors from the 4 hp. rowboat motor to the largest racing engines. Streamlined in design, the constructional features are unique and present such developments as extended motor wells for quick planing action, and a combination of vee and convex bottom for safe and super-efficient high speed operation with low and high powered outboard motors.  Construction is simple. It calls for three transverse frames, and a plywood covered hull, offering a boat that is fast in operation, extremely strong, and light in weight. The removable motor board affords a means of adapting the hull to various motors while easily made plywood stabilizers provide safe turns at high speed.

12 pages, 1 plate(s)

$7.95
Fast Hydroplane for Small Motors (Pub. No. 5769)

by Bruce N. Crandall

LOA 8' 1", BEAM 42", DISPLACEMENT 90 LBS.

If you (or your boy) have a yen for speed,but are faced with a small-outboard budget, this inexpensive  and easily built boat may be just your ticket

Here’s an easy-to-build, inexpensive little boat that utilizes the simplest and most efficient type of hydroplane bottom. While an experienced driver can use more horsepower, it is especially designed for the young driver who wants to get the greatest speed possible from the small and inexpensive 5 to 7-hp outboard motors. Standard types of racing hydroplanes cannot be expected to give the best speed and efficiency with these small motors, because they are designed for much higher speeds, with racing motors of much greater power.     The planing surface of this design is a simple flat plane that is absolutely straight fore and aft and from side to side. No attempt has been made toward soft riding, as speed and safety are the only considerations. The dimensions of the planing surface have been calculated for best efficiency with a driver weighing 100 to 150 pounds and at speeds from 20 to 24 mph. Nontrip chines for safety on turns have been incorporated in the simplest manner, and the whole hull is designed for easiest possible construction. The construction is so simple, in fact, that all dimensions are given directly on the frame drawings, and no Table of Offsets, lofting (laying down the lines)are necessary. A boy can build ithimself, and in a small corner of the shop.

8 pages, 2 plate(s)

$7.95
Minimax (Pub. No. 5820)

by William D. Jackson

LOA 8 FT., BEAM 4 FT., WEIGH 68 LBS, CAPACITY 2

Most Popular of All S&M Boat Plans

Minmax is exactly what the name implies--a boat requiring the minimum in time and material to build to give you the maximum in performance and water-sport fun. Actually, Minimax was built in one day at a cost of $20. It will carry two people, take outboard motors ranging from 3 to 15 hp, has a watertight air compartment that will support 900 lbs. even with the cockpit completely filled with water. As to performance, Minimax will plane a 165 lb. man up to 15 mph with a 3 hp outboard motor. With 10 hp and over, the hull planing area diminishes until Minimax becomes air-borne and rides upon the motor's cavitation plate. Only two pieces of 4x8 ft. 1/4-in. thick plywood and ordinary lumber yard stock are required. Framing is held to an absolute minimum with plywood skin stressed to offer greatest strength and light weight. Complete and ready to go Mmimax weighs only 68 lbs. and may be handled by one man on a car-top carrier. No building form is required because the hull is developed on the plywood as the work progresses.

8 pages, 3 plate(s)

$7.95
Doodle Bug (Pub. No. 5825)

by William D. Jackson

Doodle Bug is a trim, single cockpit, outboard hydroplane.


Doodle Bug has a new type of convex bottom and non-tripping chines which combine to produce a remarkably fast boat with excellent maneuverability. Any outboard motor from 9 to 25 h.p. can be used to power Doodle Bug for thrilling speeds, miles faster than most present day factory made craft. The design was evolved by selecting the best points from a series of small hydroplanes and building them into this one boat And, before offering the boat to all of you boat enthusiasts, we built and tested two of them, both of which perform beautifully. The tails at the transom which produce the unusual streamlining effect of this attractive speedster may be omitted if you wish but our tests indicate that they improve its operation, and should be left as an integral part of the boat. Waterproof plywood is used to cover the frame work.

8 pages, 2 plate(s)

$7.95
Atomite (Pub. No. 5826)

by William D. Jackson

You can't beat this tiny hydroplane for high-speed fun afloat.

Here is a fast and furious, but at the same time, highly maneuverable 91/2 ft. outboard hydroplane, designed for outboard motors of 7- to 10 hp or larger.

10 pages, 1 plate(s)

$7.95
How to Build Pint Size--An Outboard Hydroplane (Pub. No. 5848)

An A Class Outboard Stock Hydroplane

LOA 8 ft. 2 in., BEAM 45 in.

Pint Size was born during the 1951 Motor Boat Show. At that time only a few people were conscious of the need of large numbers of the outboard racing fraternity for more speed than was available with utility type boats. As the idea of using their well tuned, but strictly stock, motors on hydros was bandied about, the demands grew into a hurricane that literally tore the roof off racing officialdom. Only a few trials proved that the combination had what everybody was looking for. The little stock motors built by the hundreds of thousands in the past few years had the power required to drive the hydroplane-type boats at speeds far above those possible with utility hulls. It was only a matter of two months until the American Power Boat Association had given the new combination probationary status and the first authorized Stock Hydro plane racing was held during the Palm Beach, Florida, Regatta on March 4, 1951. By the end of March almost a hundred outfits were registered with the A.P.B.A. and when the summer racing season opens in the North it will not surprise too many if several hundred registrations have been made. First we will define an A Stock Hydroplane. The rules under which these new classes race are the time tested and approved rules for outboard hydroplane hulls and stock utility motors. These rules say that an A Stock Hydro is one that has a hull weight, including steering wheel, controls, hardware and permanently fastened padding, of not less than 100 pounds and is powered with a strictly stock outboard motor of between 10 and 15 cubic inch piston displacement. By a strictly stock motor is meant one that is just as it came from the factory, with no improvements or custom modifications. It was to these rules, but based on several recently successful boats, that Pint Size was designed. Let's look first at the lines plan. Note that the hull form is conventional, having a step about amidships and beveled chines both forward and aft. The deck is of easy curve and the cockpit is enough to take most moderately sized drivers. The offsets give the dimensions in inches and eighths to the outside of the planking and all the lines should be reproduced full size.

8 pages, 3 plate(s)

$7.95
How to Build Skat Kat (Pub. No. 5859)

by Rogers Winter

LOA 12 FT., BEAM 3 ft. 11 in.

This “hot rod” with the hull form of a scow-type hydroplane will provide plenty of speed—and doesn’t require a monster motor. In fact, 15-hp--the safety limit—should produce speeds up to 50 miles per hour

Skat Kat is fun boat—fun to build and fun to run. She goes fast. Technically, this “hot rod” has the hull form of a scow-type hydroplane, a type that at one time held a good many world speed records. Breaking records, however, was not what was in mind when Skat Kat was designed. Rather, it was intended that this boat be something to have fun with in the water and, at the same time, not be a craft that would require an enormous motor to push it up to good speeds. Theoretically Skat Kat will hit 40 mph with a 10-hp outboard on her stern, and something in the neighborhood of 50 mph with a 15. These speeds are based on the somewhat conservative standards of the Society of Small Craft Designers, figuring the combined weight of hull, motor and pilot at 300 pounds. It is impossible, however, for any designer to state categorically that any particular boat will attain a certain speed. There are too many variables. One motor will be in better condition than another, producing more horsepower; and any hull will vary in weight according to what kind of lumber is used. In addition, two identical boats, built from the same plans, will vary several miles per hour in speed because of small variations in the hull that are Unnoticeable even to skilled eyes. In the final analysis, however, Skat Kat wifi produce plenty of speed—so much, in fact, that it is suggested very strongly that no motor over 15 hp be used. It would be unsafe.

8 pages, 4 plate(s)

$7.95
Sea Biscuit (Pub. No. 5886)

by Weston Farmer

LOA 8 ft., Beam 4 ft.

Want a real speed box? You will get it here. She’ll build for about $30 in materials* screws and paint—and even an amateur will build her in 40 hours. Power her with 5 hp— and she’ll give speed aplenty!

It seems like yesterday, but it was nearly thirty years ago when Lockwood-Ash came out with a 4 hp Opposed outboard that was hot enough to plane a flattish light boat. Soon Johnson countered with 6 hp, and the next few seasons saw a new kind of small boat appearing in locust numbers on all waterways. I can remember what a great day it was for boating when Lockwood-Ash first planed a boat with a kicker! Each new planing design gave the game a shot in the arm. The biggest shot of all was a little craft doped out by Bruno Beckhard of Long Island, an outboard dealer with a knack for experimenting. Bruno designed a little speed box 8 ft. long by 4 ft. beam which could be built in a couple of afternoons. Shortly, Bruno’s boat was cleaning up right and left. Various versions of the idea were built and the plans were published under such names is Cute Craft, Nize Baby, Sez You and others Thousands of them wets bullt. Even in those days this writer was designing hydroplanes and racing them. In the many years applied to naval architecture since, much has been learned of planing hydrodynamics. New materials like plywood and plastics are now available, motors have been lightened, power zipped up. Pounds-per-horsepower, the criterion of speed over water, has been halved. All of which is why it seemed a logical development to me to recook Bruno’s ancient basic idea—make a simple 8 ft. by 4 ft. box, use plywood for low hull weight, and put a completely new bottom between the chines that would embody latest hydrodynamic thinking. The result: hard to design, easy to build Sea Biscuit. This little speed box is 8 ft. long inside her raked bow baffle, and 4 ft. beam at the bow, her greatest width. She’ll build for about $30, in materials, screws and paint. A man can lay her out in about 3 hours; the transoms and frames can be built and erected in a day. Planking will take longer. An organized boat shop can build a Sea Biscuit in 2 working days, but an amateur would take closer to 40 hours. Thus $30 and 40 hours after starting you can be trying out a Sea Biscuit ofyour own. Bruno Bekhard’s sensation was built with arcuate frames, inverted from bow to mid-length. From that point aft the bottom was absolutely “flat’ athwartship. This made Bruno’s craft unbankable’ and hence hard to turn. I drove many such hulls, and occasionally would forget the nature of the beast and throw her into too tight a turn. Immediately I would find myself with considerable loss of dignity and total absence of boat flapping through the air to another part of the lake. Our boat here has a different bottom. Dead rise has been apportioned throughout that part of her length which bears on water, and in a fore and aft direction longitudinal concavity has been provided to make her run flat. Sea Biscuit will handle better, run flatter than the old cute crates. An ordinary 5 hp kicker will make her whiz. Power her with 71/2 hp and she’ll go faster than you care to drive this tiny boat.

8 pages, 4 plate(s)

$7.95
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