A toy boat with a jet engine. Drawing, description

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A toy boat with a jet engine. Tips for a modeller

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In 1922, the Soviet inventor K.K. Kosmind-Yushenko proposed the design of a toy boat with an unusual jet engine. Take a look at the top picture. A curved tube, open at both ends, is embedded in the bottom of the boat. This is the engine. The lower opening of the tube communicates with the pool. Therefore, the middle, horizontal section, which is slightly thinner than the water level, is always filled. If it is heated, steam is formed, which, escaping from the hole in the pipe, will create jet thrust ...

What is the novelty? And that now it is not necessary to load the working fluid on board. It is full around - have time to pick it up! You will undoubtedly appreciate the advantage of the new scheme by building a boat yourself.

A good engine for our model will come from a copper tube with a diameter of 4-6 mm. It is better to make the boat itself out of tin, and solder the engine into a hole made in the bottom. To make it work better, solder the lower inlet with a tin circle, and then make a hole in it. Its diameter should be about 6 times smaller than the engine outlet. Experiment will tell you more exact dimensions. And another very important condition. The inlet should be under water at a depth of about 5 cm, and a horizontal section just below its level.

Toy boat with jet engine

In this form, the boat is suitable for playing in a quiet pond or in a bath. The fuel for it can be "dry alcohol" or the stub of a candle. But the engine, in principle, allows you to get very high speeds. A possible version of the velocity model is shown in the figure below.

The main thing in it is the curved engine pipe (1), shown in section. It has a special cross section. The water flowing during the movement of the boat, passing through a smoothly outlined inlet, slows down the speed, thereby increasing the pressure. Due to this, high pressure and temperature steam can be obtained in the pipe. Flowing out at almost supersonic speed, it creates significant thrust.

But it is also necessary to provide that at the exit the cross section of the pipe first decreases, and then smoothly expands, as in the nozzles of steam turbines. Otherwise, supersonic speed cannot be achieved.

Toy boat with jet engine

The entire engine is located inside the furnace and its chimney (2). The jet of steam sucks the products of combustion in the pipe, and a powerful thrust arises in the furnace. This allows you to burn fuel at high speed. After all, such an engine needs a lot of heat.

Therefore, a primus burner or a blowtorch is best suited for the firebox.

Author: A.Ilyin

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