Is it difficult in heaven? People at that time really didn't find the way to heaven. Earlier, people had only a superficial understanding of the flight phenomena of birds and insects, but they knew nothing about the sky!
Ge Hong (AD 238-263), a medical scientist in Jin Dynasty in China, collected herbs in the mountains all the year round, and the environment attracted him to observe and study the flight of birds. He expounded the essence of flying kites, saying that kites spread their wings, do not flutter or fan, and rise by vigorous air (updraft).
People know from exploration that people should conquer the sky with wisdom rather than physical strength. Since leonardo da vinci, people have conceived and made all kinds of flying machines to conquer the sky. Leonardo da vinci painted a vivid picture of human flying machine money, which is the best answer.
He designed a spiral helicopter, conceived as a large spiral body made of light materials and cloth. Once it rotates, it will drill into the air like a screw, soaring and interesting. The pilot can pull the rope, tilt the rope and use it to change the flight direction. This design idea is based on China's bamboo dragonfly principle.
Leonardo da vinci is brilliant and interested in writing. He is famous in many aspects of engineering. He also put forward sketches such as "parachute map" and "streamlined hull". Although his paintings were just pleasing to the eye at that time, they did not create a navigable aircraft. However, the unique and thought-provoking design embodied in his papers and manuscripts leads people's beautiful yearning for flying to the reality of seeking aircraft and flying methods. The ideal of aviation began to slowly embark on the scientific track.
After leonardo da vinci, a Jesuit priest used the principle of container drainage and floating to imagine an airplane. A small boat and four big copper balls fixed on the boat are all of the "aircraft". He thought, if the air in the ball is pumped out, won't the boat float?
In fact, this simple and subjective idea was the first idea of the airship. In the17th century, an Italian made a small ball out of brass and used a vacuum pump to suck the air out of the ball. He thinks the ball will float. Unexpectedly, the ball was deflated by external atmospheric pressure before the gas was pumped out. If you know the German scientist Otto. Von Gehrig's vacuum experiment will tell the truth.
1 8 4 3, an Englishman, W.S. Henson, made a very unique single-wing model plane and performed it in public, which greatly improved people's basic understanding of flying. This kind of airplane model, which Henson called "the car in the air", played a great role in promoting airplane model activities in the19th century, and even had a positive impact on the design of modern airplanes. Henson was later called the pioneer of propeller plane. At that time, due to the lack of proper power, the model plane could not keep flying in the air for a long time. After the test flight of the model plane was not successful, Henson left England and lived in the United States.
Five years later, his friend, John Stringfellow, improved the model plane into a steam engine, advanced it in two stages along the path explored by Hansen, and tested the rotary propeller model monoplane in Gremen Park in London. Because the structure is too heavy, the model felt machine can only fly along the conductor, but it is a big step forward than Henson's design, and the plane has a prototype.
From 65438 to 0868, the British Aviation Society held the first aviation exhibition in the world. Sterling Ferro exhibited his three-wing plane. Later, his son, F.J. Stringfellow, inherited his undisputed career.
18 8 6, F.J. Stringfellow made a novel biplane model, which was relatively large in size. In fact, it was a prototype plane that could carry people. He has made positive contributions to the development of aviation.
18 7 1 year, French Peng Lao created a helicopter toy, which was made of two pairs of relatively rotating feathers. Feathers are inserted into the upper and lower cork, and the bamboo bow wound in the middle is used as power to drive the feathers to rotate, but unfortunately it is only used as a toy.
On the basis of helicopter toys, Peng Lao made a rubber band power model plane. The wing is made of light metal wire, and the propeller installed at the tail is made of two feathers and driven by a rubber band. It is said that this model plane once flew to an altitude of 60 meters. This is undoubtedly the great achievement of 130 years ago.
1 8 7 7, Melikov, England designed a helicopter, which used the reverse thrust generated by ether steam injection to drive the rotor to rotate. The rotor is shaped like a big umbrella and can "drill" into the sky like a propeller when it rises. After the ether is used up, the big umbrella can make the helicopter land slowly like a parachute. The rod body is provided with a propulsion propeller. This design is just a model, and there has been no manned flight.
In the Paris Museum in France, there are 1 piece of drawings and various strange models of Eupatorium odoratum entrusted by people to study. If you have the opportunity to visit there, the flying ideals of aviation pioneers will be vividly displayed in front of your eyes.