Model Boats

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Flash Steam Plant for Small Model airplanes (Pub. No. 5919)

CONTENTS--Operation and design of the engine—How the engine is made—Design for a six-cylinder engine working on the same principle—Description of a flash steam plant to drive the engine.

The development of a suitable power plant for very small model airplanes has long been the ambition of a great many model enthusiasts. To the advanced model maker there is not a more interesting and fascinating branch than that of model airplaning. The use of steam as a motive power for airplanes is, as we all know, a very old idea, having been first attempted by Stringfellow in 1846 in England, by Langley in 1896 in America, and of late years by Messrs. W. O. Manning, H. H. Groves, and V. E. Johnson in England. The experiments of these last three gentlemen, as recorded in the Model Engineer and Electrician, have been a great incentive and also exceedingly helpful and instructive to the writer in the development of the flash steam plant about to be described.

8 pages

Design and Construction of Model Boilers (Pub. No. 5920)

CONTENTS--Efficiency of model boilers—Evaporative power—Convection currents—Boiler design—Pot boilers—Water-tube boilers—Marine boilers—Riveting model boilers—Super-heaters.

Small boilers to drive model steam engines may be made according to several different designs. Some of these are more efficient than others from the standpoint of evaporative power and some are more adaptable than others for a specific purpose. As an example, a vertical pot boiler would not be as successful for use in a model speed boat as a flash boiler would be and yet, many times, the flash boiler could not be employed as conveniently as the pot boiler in certain work. The model maker should therefore choose the type of boiler that is most adaptable to the work for which he wishes to use it. This text will describe a few of the more common types of boilers together with information that will aid greatly in designing and constructing them.

8 pages

Model Boiler Fittings (Pub. No. 5921)

CONTENTS--Design and construction of safety valves, check valves, water cocks, water gauges and steam gauges.

The efficiency of a model boiler depends somewhat upon its fittings, such as safety valves, stop valves, check valves, et cetera. A poorly constructed, leaky valve or boiler fitting of any kind is just as bad as a leak in the boiler and will cause a serious reduction in the working pressure. Therefore, it is quite necessary that a valve or fitting of any kind be made very accurately to insure maximum efficiency. Probably the most important fitting on a model boiler is the safety valve. There are many types of valves, each with its advantages and its disadvantages. In some cases, one type of valve is more adaptable for a certain boiler than another. A properly designed and regulated valve will blow off when the critical pressure is reached in the boiler; below this pressure it should not leak or "weep" in the least. After the valve functions, it should return to its normal position immediately the pressure has fallen beyond the danger-point. Such a valve is not very easy to construct, although the model maker, at first thought, may think that it does not present any difficulties whatsoever. In designing safety valves the model maker must bear in mind the fact that the interior surface of the valve plug determines the pressure at which it will blo woff—the larger the surface, the lower the pressure needed, and vice versa.

8 pages

A Record-Breaking Model Hydroplane (Pub. No. 5922)

CONTENTS--The hull of the boat—Its flash boiler and twin-cylinder, high-speed steam engine.

The model described in this booklet is the result of considerable experimentation, both in the making of various types of hulls and power plant equipment. The craft was really made to bring the model speed boat record from England to America, and in tests "Elmara" has shown a speed slightly in excess of 30 miles per hour. The English record held by the "Evil Spirit" is 26.7 miles per hour. The dimensions of the hull are as follows: Length 39.37 inches, beam 77/8 inches, step 11/4 inches high, sides forward of the step 41/4 inches high, sides directly back of the step, 3 inches high. The distance from the bow to the step is 171/4 inches. The weight of the complete hull is 2 pounds 11/2 ounces. Only two materials are used in the construction of the hull—aluminum and mahogany. Mahogany is a very strong wood, will take a smooth finish and is more or less unaffected by moisture.

8 pages

A Model Lake Freighter (Pub. No. 5923)

CONTENTS--Building the boat hull—The power plant and construction of the deck fittings.

The model described in this article is that of a bulk freighter of canal size such as used in the transportation of grain and ore on the Great Lakes, particularly between Fort William and Montreal. The overall length of the prototype is 260 feet and larger boats of this nature are made up to 650 feet in length. The hull of the model is 4 feet long overall and the length between the perpendiculars is 3 feet 93/4 inches. The beam at the water line is 8 inches and the draught extreme is 41/2 inches. The displacement at this draught is 401/4 pounds in fresh water. It will be necessary to use some ballast on the model in order to•bring her down to the designed water line.

8 pages

A Sharpie-Type Model Boat (Pub. No. 5924)

CONTENTS--Making the mahogany hull — Power plant — Construction of special alcohol burner.

The majority of model boat builders lack the skill to get a block of wood, shape the outside and then get down to the real job of hollowing it out with gouging tools to the desired thickness without breaking through. That is wanted for a model speed boat is a type of hull capable of being driven at considerable speed with the least possible water resistance and consequently with the least possible power. The "Experiment" has no curves except the sides. Floor and sheer lines are absolutely straight from bow to stern. A glance at the drawing will give one the impression that the boat is utterly unsuitable for speed, yet the boat has run at the rate of 61/2 miles an hour with an ordinary boiler and engine.

8 pages

A Model Submarine with Radio control (Pub. No. 5925)

CONTENTS--Building the hull and superstructure—The radio control mechanism—Electric power plant—Special two-point relay—Automatic apparatus.

The hull of the submarine is nearly eight feet in length and, with machinery and ballast installed, the veight is a good 175 pounds without water ballast. The hull is patterned somewhat after the Lake ship-section submersible, but the characteristic design is carried a step fai-ther, giving E122 good surface riding qualities rather than submerged speed. The bow and deck lines of the model resemble somewhat those of a torpedo boat-destroyer submerged to such an extent that her deck is almost awash. This design gives ample room for machinery and controls, and it affords space in the lower hull for ballast tanks by means of which the craft may be partially submerged while at rest.

10 pages

Taking the Lines from a Model (Pub. No. 7859)

by Bertram S. Booth

With the growing interest in model yacht sailing and the increased use of models by designers in tank tests, a simple method for taking off lines should be of interest to many model builders. The following method requires only the simple device shown in the drawing and the usual drawing board and other rudimentary drafting equipment. It is entirely independent of the lifts or laminations; and the waterlines, buttocks and Stations may be spaced at any convenient interval on the drawing. No markings are required on the model and with a little care a very accurate drawing can be made. As both the buttocks and waterlines can be taken off, a check of the work is obtainable. The method is adaptable to either a full or a half model; and, if it is inconvenient, the back board of a half model need not be removed.

2 page(s)

Model Hydroplane Skims the Water (Pub. No. 7875)

By Roy L Clough Jr.

Pusher prop spun by model-plane engine gives high performance. Construction is easy and fast

Hydrofoils have been around for some time, but even so, nothing on the boating scene draws every eye like a hydroplane lifting out of the water as it gains speed. Even the U.S. Navy has been attracted to foils, and has tested them on its fast boats. The model shown here can be completed in a couple of work sessions. Surface-piercing foils and air-prop drive give it speed and stability with minimum complexity. Construction is far simpler than you’d guess from the performance. Basically, these craft deliver greater speed because resistance against several small areas (foils) is considerably lower than against a complete, submerged hull. Resistance declines as the craft rises. Completely submerged foils are the most efficient, but they require sensing and control systems to keep them at proper depth. Surface-piercing foils automatically adjust for depth—but they also have a tendency to create air bubbles that reduce lift. This model uses a foil design that minimizes this undesirable side effect.

3 page(s)

What the Country Needs: A Good 5c Chisel (Pub. No. 7931)

by Earl L. Pringle

You can make these lathe turning tools from cut nails and pieces of dowel.

Most model builders eventually need a set of small wood chisels—whether it be for fine inlaying, carving or turning miniatures. For years, I’ve been searching for the right kind of steel to make my own and finally decided to use flat, hardsteel 8d masonry (or cut) nails. These can be found at your local hardware store or lumberyard. Buy 1 lb. along with three 3-ft. lengths of 1/2-in. diameter dowel. Happily, you can make a fairly complete set for less than one store-bought chisel. They are quick and easy to make, as can be seen in the photos. It took me about three hours to make my assortment of 20 different sizes and shapes.

3 page(s)

Making Deadeyes and Lanyards (Pub. No. 7944)

How to make model deadeys and lanyards for ship models.

4 page(s)

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