Instead of electricity - sand. Drawing, description

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Instead of electricity - sand. Tips for a modeler

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Everyone knows how the hourglass works. But about the sand engine, we think, few have heard. Let's get acquainted with its device using the example of one of the designs. Its author is K. Boboshko (author's certificate No. 1.391.676).

Let's take a look at the picture.

Instead of electricity - sand

As you can see, a thin stream of sand flows down and fills the left compartments of a small turbine. Naturally, the left half gradually becomes heavier than the right - it means that a torque has appeared. The turbine starts to spin. The speed depends on the filling speed of the compartments and the load on the output shaft. It is not difficult to calculate the magnitude of the torque - it will be equal to the product of the mass of sand that filled the turbine compartments and the shoulder.

Knowing these data, you can determine the power. Of course, it is small - only a few watts. But even it is quite enough to set in motion a mechanical toy or model. And in order for the stream of sand to flow continuously, the author proposed the following solution: move the outer ring relative to the inner one. Turning it counterclockwise by 45° will restart the engine.

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