Why is the plane flying? Fun physical experience at home

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Why is the plane flying? Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Why does a kite fly? Because its plane has a slope. And the wind, pressing on the kite from below, lifts it up. If there is no wind, you have to run, drag the snakes along with you. It's all the same whether the air presses against the kite or the kite presses against the air.

Once there was such a case. A trio of horses harnessed to a cart galloped across the steppe. A huge kite flew behind the cart, tied to it with a strong rope. And under the kite hung a man! It was Alexander Fedorovich Mozhaisky, one of the inventors of the aircraft. Why did it occur to Mozhaisky to fly a kite? Yes, because the plane takes off like a snake. The plane of the wings of the aircraft also have an inclination. And they are also propped up by a headwind.

Of course, the plane does not need three horses. It is pulled by a propeller or pushed by a jet engine. But still, the history of the aircraft began with a kite. And you and I can also start with the kite. Take a double sheet of writing paper. From a log or plank, chip off three dry, even splinters. Plane out of them smooth semicircular slats about 8 mm wide and 5-6 mm thick.

Why is the plane flying?

Put two slats on a sheet of paper crosswise, and the third, short, along the narrow side of the sheet. The ends of the rails should protrude by 15-20 mm. "Horns" will stick out from above - the intersecting ends of the rails. And from below - "legs", the ends of long rails.

At the base of the horns, cut off the intersecting slats at half their thickness so that all three fit snugly on the paper. Just don't do it in the center of the sheet where the long slats cross. This is where the load is greatest, and weakened slats can break when the kite is launched. Make notches on the legs and tie loops of thread to them.

Glue the slats to the paper with liquid stationery glue. Having sparsely greased the flat side of the short rail, attach it to the paper and rub it several times with pressure with a dry rag.

Then glue the long slats in the same way. Turn the kite over, taking it by the horns and legs, and smooth the paper to the slats. When the kite is dry, make a "bridle" for it. To do this, tie the horns with the ends of the thread so that the middle of the resulting loop is pulled 3 cm further than the crossing of the long rails.

On both sides of the crossing, pierce the paper and wrap the crossing tightly with thread. Tie the free end of this thread to the middle of the loop between the horns. With the middle thread pulled tight, the knot should come out 2 cm above the top edge of the kite. Sprinkle the paper on the snake lightly with water. Once dry, it will stretch well.

For the tail, bast ribbons pulled from matting are best suited. Having connected a strip about 2 j long from them, tie its ends to the thread loops on the legs of the snake. Fold 8-10 bast ribbons 60-70 cm long into a bundle. Wrap one end of this bundle around the middle of the ribbon tied to the legs and tie it tightly with a thread. The beam must move along the tape with effort.

Tie the end of a harsh thread wound on a stick to the bridle of the snake. Stick the stick with the end into the ground and, unwinding the thread, move fifty paces in the direction of the wind. Raise the snake by the legs so that the thread is taut. After waiting for a good gust of wind, when the kite itself stretches up, let it go.

If the kite, having taken off, will roll to one side, move the middle thread of the bridle or tail tuft to the same side. If the kite tumbles or tips over, the tail is too light. Tie a bunch of grass to it.

There are many other kite designs, both simple and very complex. After all, snakes are not a new invention. They were amused in ancient times. Architas of Tarentum flew kites four hundred years before our era. Architas felt good: in his time there were no wires. And now there are as many as you like: electric, telegraph, and telephone. Let your kite only in places where there are no wires!

Author: Galpershtein L.Ya.

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