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Installing a Small Air-Cooled Inboard Engine (Pub. No. 5219)

by J.A. Emmett

Little air-cooled engines offer a solution to the power problem of the owner of a small boat who wants the economy, simplicity, and dependability of an inboard engine without its drawbacks in the way of weight and cost. Models from 1/2 to 5 horsepower can now be had from several different manufacturers at reasonable prices; they may drive direct, have a one-way clutch to permit starting the engine at the dock, or be fully equipped with clutch and reverse gear to give maneuvering ability under power. Weights range from under 100 lbs., for the small size up to 200 lbs., for a fully equipped five horse motor. Then there are the new high-speed lightweight models developed along the line of an outboard motor power head but with transmission arranged to run through the bottom of the boat which weigh as little as 42 lbs. for a 21/2 h. p. size.

8 pages

Power Your Boat With a Converted Model A Engine (Pub. No. 5273)

by Orville G. Bolstad, Consulting Engineer

(Or use the same principles to convert a modern overhead valve engine).

In looking around for an auto engine to convert for marine use in the 16 ft. runabout I was building, I pictured in my mind a rugged, reliable 4 cylinder motor of about 50 hp. Immediately it reminded me of the time, 15 years ago, when I had used a Ford Model "A" motor in a propeller-driven sled over the snowbound roads of North Dakota. Remembering how well this motor had served me, with the sled loaded down with cargo and the motor turning hour after hour at 2400 rpm, I decided to use a Model "A". And the plan worked. It doesn’t pay to turn the motor any faster than this, as 2400 rpm is about the peak of the power curve.

12 pages, 2 plate(s)

When the Auto Engine Goes to Sea (Pub. No. 5352)

by Hank Holcomb

Save several hundred dollars by doing your own engine conversion.

Not so very long ago, if you had suggested to an inboard motor dealer the iden of converting an automobile engine to marine use, he would probably have raised his eyebrows, patted you on the shoulder condescendingly and said, “Well, Mr. Smith, automobile engines are fine in automobiles, but wouldn’t you rather have a regular marine engine in your boat, something that was designed specifically for a boat?” Nowadays, however, the motor dealer is not so quick to sneer at the marine conversion. He knows that in the last two or three years the boating public has grown considerably wiser regarding such thingss. Many boaters are aware that, in fact, nearly all so-called marine engines of less than 400 hp. are simply converted automobile, truck and industrial engines no matter what you call them. He has learned that manufacturers of regular marine engines buy them and convert them in their factories, in much the same manner as we are going to show you, and then sell them under their corporate name or catchier trade names as marine engines.

11 pages

Silent Fishing Partner (Pub. No. 5355)

by Harold P. Strand

An electrically-powered outboard that you can build yourself that fills the bill for children's boats, trolling, and canvas fold-boats,

Fisherman, father, or small boat fan, you’ll find plenty of use for an electric outboard. Designed especially for fishermen who take their trolling seriously, it will also get you on many of the new reservoirs where fishing is prime, but gasoline motors are prohibited. Light weight and silent operation make the electric a partner for kayak-type folding craft and the easiest rig for kids to use while learning their outboard seamanship. The basic design calls for a 6-volt automotive-type generator adapted by resistance controls to be powered by a 12-volt, 66-plate battery. Heavier-duty batteries will, of course, provide longer running times before recharging is necessary. The photograph shows the finished trolling motor mounted on transom alongside a larger outboard; electric is always ready for trolling use. Tested in this way with a 600-lb. gross load, six hours of trollingwere obtained from a single battery charge with continuous speeds of 3-4 mph.

8 pages, 5 plate(s)

Propellers for Auxiliaries (Pub. No. 5443)

by Philip L. Rhodes

Ever since auxiliary power became a practical necessity on cruising sailboats there has been a continual battle of opinion regarding the best location for the propeller. While other positions are not out of the realm of possibility, auxiliary propellers generally are placed either (A) on the centerline in an aperture in the deadwood and rudder, (B) off-center where the shaft and heel are supported by a strut, or (C) on the centerline with the wheel completely abaft the hull and rudder where the propeller shaft extends past the stern post or, more recently, through the rudder stock in the manner devised by Paine. The purpose of these notes is to consider the relative merits of these three propeller positions as they affect the performance of a boat both under sail and under power.

8 pages

Right Prop for Your Boat, The (Pub. No. 5479)

by Art Mikesell

There’s a good chance that you can get a boost in performance by switching props. To find out for sure, try this easy test

The sole function of a propeller is to turn power into push. With the right prop your boat will be a joy to operate, an agile, responsive rig running at top efficiency. Any other prop is a step in the wrong direction, because it won’t deliver all the push your engine can provide. Most boats today are running with props that do not quite match the requirements of the motor, hull and boat owner. When you buy a motor, you have to choose a prop on the basis of the motor manufacturer’s recommendations as listed on a prop selection chart. These recommendations are based on horsepower, boat length, gross load and intended use. They’re designed to prevent you from making a bad error in prop selection by limiting your choice to a comparatively small number of propellers.

15 pages

Improving Economy and Performance of Power Boats (Pub. No. 5632)

Fuel is precious—do not waste it! That is the message beamed to boaters and they should heed it not only for the sake of economy, but also to conserve a dwindling energy supply. For a number of reasons, however, the idea of saving anything appears to be repugnant to many who follow a “throwaway lifestyle,” so let us approach fuel saving from another angle—a way to make your favorite recrealion more enjoyable. And that is a fact—-you can get more fun out of boating and save fuel at the same time.

28 pages

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