Introduce the history and extension of the bamboo dragonfly

Born from a robot cat.

It has not yet been used for civilian use.

1. Materials and tools: one piece of wood, size 20*3*cm. As the name suggests, bamboo dragonflies are best made of bamboo, and wooden blocks are used here because wooden blocks are easier to find.

A small cylindrical wooden stick, about 20 cm long and 3 mm in diameter, is very good for the bamboo skewers of the sugar gourd. Knife, glue, fine sandpaper.

2. Punch a hole in the middle of the small wooden block first, and the diameter of the hole is slightly smaller than that of the small wooden stick, so that the small wooden stick can be clamped tighter.

3. Sharpen small wooden blocks with a knife, starting from the middle position to one side, and cutting into an inclined plane, high on the outside and low on the inside.

4. The back side is also processed, so that the whole is an inclined plane.

5. The other side is also processed according to the same steps, and then fix the cylindrical small wooden stick in the hole in the middle of the small wooden stick, if it feels loose, apply the dispensing glue appropriately.

6. If you are a perfectionist, use fine sandpaper to polish the burrs on the leaves. You can also give it some color, pattern.

7. How to play: Put the handle of the bamboo dragonfly - a small wooden stick in the palm of the hand with both hands, rub the right hand forward, and when the right hand rubs to the end, the bamboo dragonfly will fly out, the greater the strength of the rubbing, the faster the rubbing, the higher the bamboo dragonfly will fly, and the longer it will fly.

Bamboo dragonfly is one of the traditional Chinese folk children's toys, which is widely spread. The bamboo dragonfly consists of two parts. One is the bamboo handle. The second is "wings". When playing, rub your hands together, and then let go of your hands, and the bamboo dragonfly will fly into the sky.

After spinning for a while, it will fall. It is a very ingenious little invention in ancient China, this simple and magical toy, once amazed Western missionaries, called it the "Chinese spiral". In the thirties of the twentieth century, the Germans invented the propeller of *** according to the shape and principle of the "bamboo dragonfly".

Bamboo Dragonfly Main Content Bamboo Hall Please Main Content is His Um Marketing and His Bamboo Dragonfly Main Content Bamboo Hall Please Main Content is His Um Marketing and His.

The bamboo dragonfly is a very simple thing, you only need to make two parts out of bamboo, one is a spiral head, one is a vertical rod, and the two are pressed together.

The main content of Bamboo Dragonfly is mainly written about some interesting projects in childhood, which can be done by mood.

1. Origin.

The bamboo dragonfly was made by the Chinese BC and has been a toy in the hands of Chinese children for more than 2,000 years.

It was introduced to Europe in the 18th century and inspired people's thinking, and George Kelly, an Englishman known as the "father of aviation", was fascinated by bamboo dragonflies all his life. His first aeronautical research was the imitation and modification of the "bamboo dragonfly" in 1796, which led to the realization of some of the working principles of the propeller. His research drove the development of the aircraft.

And it has brought inspiration to Western designers to develop the best products.

2. Introduction. Bamboo dragonfly is a traditional children's toy of the Han nationality, which is widely spread. When playing, rub your hands together, and then let go of your hands, and the bamboo dragonfly will fly into the sky. After spinning for a while, it will fall.

It is a very ingenious little invention in ancient China, this simple and magical toy, once amazed Western missionaries, called it the "Chinese spiral". In the thirties of the twentieth century, the Germans invented the propeller of *** according to the shape and principle of the "bamboo dragonfly".

3. Principle. There is an inclination between the blades of the bamboo dragonfly and the horizontally rotating surface (this inclination angle can be adjusted).

When the rotor rotates, the rotating blades push the air downwards to form a strong wind, and the air also gives the bamboo dragonfly an upward reaction lift, which changes with the inclination angle of the blades. When the lift force is greater than the bamboo dragonfly's own gravity, the bamboo dragonfly can fly upward.

The blades and rotating surface of the bamboo dragonfly also maintain an inclination, so when we rotate the bamboo dragonfly by hand, it will get the reaction thrust of the air and fly upwards.

The greater the resistance area of the wing surface, the greater the force, and therefore the greater the reaction force (and the greater the buoyancy), the higher the bamboo dragonfly flies. However, we also found that the larger the resistance area, the greater the rotational force required, so it is not practical in the actual operation of the bamboo dragonfly, and it may be necessary to find a balance point in the force and angle area to make the bamboo dragonfly effortless and easy to operate and fly high.

Find a balance between weight, inertia), angle (rising velocity), area (lifting force).

All I know is that Duraemon and Nobita can fly when they wear it.

The bamboo dragonfly is a major invention in ancient China. When playing with yourself, rub your hands together, and then let go of your hands, and the bamboo dragonfly will fly into the sky. Spin for a while before falling.

This simple and magical toy once amazed Western missionaries and called it the "Chinese spiral". In the thirties of the twentieth century, the Germans invented the *** propeller according to the shape and principle of the "Chinese spiral". (Introduction).

Because it looks like a dragonfly.

The shape of the bamboo dragonfly is T-shaped, the horizontal piece is like a propeller, there is a small hole in it, in which a straight bamboo stick is inserted, rub this bamboo stick with both hands, the bamboo dragonfly will rotate and fly into the sky, and only fall to the ground when the lift is weakened.

In the process of making and playing with bamboo dragonflies, you can appreciate the fun of ancient Chinese children's toys and the mystery of science and technology.

Because the long handle is like the body of a dragonfly.