Boat with direct-flow steam engine. Drawing, description

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Boat with direct-flow steam engine. Tips for a modeler

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What is the term "straight-through" commonly associated with? Of course, with aircraft jet engines to achieve the highest supersonic speeds. And how can a steamboat become direct-flow? That is what we are going to tell you about today.

The "heart-engine" of the proposed microvessel is an unusual device based on the principle of action on convection. Recall that a similar effect has found application in liquid cooling devices for some automobile engines (Trabant and others). On these machines, the water circulates on its own, as the warmer one tends to rise up, and the cold one goes down. Thus, the cooling system "pumps" water without the use of any pump.

A semi-copy of a fishing boat with a ramjet steam engine (click to enlarge): 1 - bow deck (deck - tin), 2 - hull sides (tin or roofing iron), 3 - mast (pine or birch), 4 - cargo boom (wire) . 5 - body (linden or birch), 6 - "cutting" (tin or roofing iron), 7 - pipe (tin), 8 - coil tube, 9 - boss for wedging coil tubes, 10 - steering wheel (roofing iron), 11 - pallet (tin or roofing iron), 12 - fuel pellet, 13 - asbestos gasket, 14 - wooden hull board.

After the construction is completed, cover all wooden parts with two layers of warm drying oil and paint with oil paints. Do not solder metal parts, except for the side and deck elements.

The steamboat engine is based on a similar principle. Hot water, warmed up and partially boiled in the coil, will rise up and then be thrown out through the aft section of the upper part of the tube. And the lower one will become an intake of fresh liquid, which will enter the coil for heating. The heat source is a tablet of dry alcohol or a piece of asbestos wool soaked in gasoline.

(click to enlarge)

The numbers of individual parts correspond to the positions of the drawing of the general view of the boat model.

Boat with ramjet steam engine

Immediately after cutting, bend the even petals outward by 90 °, and the odd ones - when assembling with part 6.

The coil is bent from a thin-walled metal tube with a cross section of 4 to 6 mm and a length of approximately 650 mm. A rod with a diameter of 18-20 mm will serve as a mandrel for winding the working part. The number of turns of the coil is from three to five. In this case, its total height should not exceed 30 mm and a gap of at least 2 mm should be maintained between the turns. The coil leads are as short as possible so as not to create excessive resistance to the fluid flow. The tube sections must be placed so that the difference in height between them at least does not exceed the total height of the working part of the coil (note: in the figures, with a coil height of 22 mm, the tube sections are located one above the other at a distance of 18 mm). It is important to note that the cut of the upper part of the tube must be at least 10 mm below the water level on the floating model. The coil with outlet tubes is fixed on the steamer by wedging in the slot of the body.

Boat with ramjet steam engine
Working model. The engine is open, the tube is fastened with a wooden wedge.

Boat with ramjet steam engine
Boat model with a mid-mounted power plant.

A good use of heat from the combustion of a tablet of dry alcohol is provided by a "cutting" curved from tin or roofing iron and, in fact, the body of the "stove". Between the fuel element and the coil, a space of about 10 mm must be left in height to allow free access of air to the flame. At the bottom of the "cutting" is placed a pallet, which is pushed forward when replacing alcohol, and in the working position lies on a heat-resistant asbestos gasket.

Before starting with the help of a medical "pear", the tube is filled with water and the steamer is placed on the water. Then the fuel is ignited, and the pan is pushed into place. When testing the model, you must be careful not to burn yourself on hot metal parts.

The motor with the proposed overall dimensions is suitable for driving any models with a length of 150...300 mm.

To work out a motor installation, you can create a stand model, which is a simple outline of wood. And only then proceed to the construction of a half-copy of a fishing boat, which is shown in the figures. If desired, it is quite acceptable to place the engine not in the stern of the microvessel, but in the middle of its hull. An interesting solution is a universal type, when the sailboat model is retrofitted with a direct-flow motor unit. Of course, here it is necessary to solve the problem of protecting the sails and spars from the flames of the steam plant.

According to the magazine "Modelist-constructor"

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