Wind in harness. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
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Wind in harness. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

"That doesn't happen," you say. "You can only harness horses. And the wind ... It's air. Try putting a collar on it!" And yet the wind can be harnessed. How? Ask the Saratov boys, members of the aircraft modeling circle of the city Palace of Tuners. Every winter they build large models of box kites. And then they get on skis, pick up the handrail like reins ... So kites fly in the clouds near Saratov in harness.

Andrey Fomich Grigorenko, a great connoisseur of wind skiing, an experienced modeler, came up with these exciting ski races. For many years, Andrey Fomich has been leading a circle of aircraft modellers. The first craft made by young modelers in a circle is a model of a box kite. Try to make yourself such a kite and ride to your health.

Wind in harness

We think everyone knows the design of the box kite. Our drawing shows one of the options for a box kite, very similar to an airplane. It was developed by Russian inventor Ivan Konin. It has two wings and a triangular frame (the cross section of a kite can be square). Thanks to the wings and the optimal angle of attack of the bearing surfaces, the kite quickly gains height, does not tip over in case of sudden lateral gusts of wind and remains stable in flight. The depth of each box is 0,7 times the side of the triangle.

First, let's talk about how to correctly calculate the bearing surface and the pulling force of a kite. The calculation of the force (F) with which the kite will pull you is made according to the formula:

F=K*S*V*N* sin(A),

where K=0,096 (coefficient); S - bearing horizontal surface of the kite (m2); V - wind speed (m/s); N - coefficient of normal pressure (see table); A - the angle of the kite to the surface of the earth.

There are three unknowns in this formula: force (F), wind speed (V) and bearing surface (S). Two of them are easy to identify.

Get on your skis. Pick up the steelyard - spring scales for home use. Let your friend (without skis) pull the steelyard hook. You will go, and the arrow on the scales will show the friction force of the skis on the snow - about 4-7 kg. As you can see, the value is small. It depends on the weight of the skier, on the length of the skis, on how they are lubricated, and, of course, on the condition of the snow. Add another 2-3 kg to the measured force in reserve and substitute the result in the formula.

Wind speed is the second unknown quantity. You can define it like this. Hang a tennis ball on a string and use a protractor to measure the angle at which it deviates under the action of the wind. And then, according to the graph shown in our figure, knowing the value of this angle, determine the wind speed.

Thus, in our formula, only the bearing surface (S) remains an unknown quantity. Having calculated it, proceed to the construction of a box kite. The frame of the model should be assembled from flat rails with a section of 20x20 mm. But the bar for which the bridle is attached should be thicker - with a section of 20x30 or 25x25 mm. It is desirable that the slats for the kite be free of knots and knots.

Author: V.Zavorotov

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