Operation Principle
As we all know, there are two necessary conditions for a kite to fly:
The kite must be in windy weather before the kite can fly
Kites must be pulled by strings, and a "kite with broken strings" will definitely fall after a short period of floating far away
Generation of lifting force:
The kite is in the air Get windy because the air separates into upper and lower layers. The air passing through the lower layer of the kite is blocked by the kite surface, and the air flow speed decreases and the air pressure increases; the air in the upper layer circulates smoothly and the flow speed increases, causing the air pressure to decrease; the lift is generated by this difference in air pressure, which is why The reason why a kite can rise.
It can be seen from the above that there are two factors in the generation of lifting force: 1. Wind force; 2. Traction force; the direction of wind force is basically horizontal direction, and the angle at which the kite receives the wind and the magnitude of the lifting force can be determined by Thread lift for easy control. After several practices, kite flyers will quickly master the skills of controlling the kite: when flying a kite, they usually pump and release the kite.
When pulling, because the kite string is usually placed on the upper part of the kite surface, increasing the traction force can control the kite angle to become smaller, the upward force increases, and the kite rises steadily; when flying, it is balanced The traction force of the kite becomes smaller. Under the combined effect of wind force and lifting force, the kite will fly high and far away, but it must be pumped again quickly to keep the kite's angle stable again.
When the wind is strong, you can put out more lines. When the wind drops slightly, you can take in some lines.
Extended information:
Notes
1. When choosing a location to fly a kite, choose a spacious non-traffic road, pay attention to the surrounding ground conditions, and the road surface must be It should be flat, with no ditches or bumps. Observe the conditions of buildings within the movement range in advance. Because people are always moving backwards when flying a kite, special attention should be paid to preventing falls.
2. Pay attention to whether there are wires around to prevent electric shock due to contact between the kite and wires. Try to keep the kite dry. If it is hung on the wire, do not pick it up hastily to prevent electric shock and falls.
3. Due to the characteristics of kite sports, it is necessary to raise the head for a long time and maintain the same posture for a long time. Therefore, the elderly and athletes with insufficient blood supply to the spinal arteries are reminded to avoid this when participating in this sport. Turn your head suddenly to prevent sudden contraction of cerebral blood vessels, and adjust the length of time you participate in exercise according to your physical condition.
4. Athletes suffering from respiratory and cardiovascular diseases should avoid flying kites in noisy venues for long periods of time.
5. Protect your skin and body organs according to weather changes. Avoid solar dermatitis, skin cancer that may be caused by excessive ultraviolet rays, and dehydration in the hot sun. When the weather is not too mild, the elderly and people with poor peripheral nerves should especially pay attention to climate change and appropriate amount of exercise, because standing for a long time can cause frostbite on the hands and feet.
6. Pay attention to the choice of environment. Never fly a kite near the airport, near telephone poles, train tracks, on top of high buildings or during lightning. It is more suitable to fly kites in parks, on hills, in open areas beside rivers or at the seaside.
7. When flying kites, be sure not to fly kites in crowded places, let alone in relatively concentrated public squares, because there are many pedestrians and the kite strings can hurt people. It is reported that a kite in Henan The man hit the kite string and his throat was cut, almost killing him.
Baidu Encyclopedia-Kite Flying