/kloc-in the 0/8th century, French papermaker Meng reinvented the hot air balloon in Europe. Inspired by the rising paper in the stove, they used paper bags to collect hot air for experiments and let the paper bags rise with the airflow. On June 4th, 1783, the Mongols gave a public performance in Annone Square in Lyon. A simulated balloon with a circumference of 1 10 foot rose and floated 1.5 miles. On September 19 of the same year, in front of the Palace of Versailles in Paris, the Meng Gefei brothers performed a hot air balloon launch performance for the king, queen, court ministers and130,000 Parisians. In the same year, on the afternoon of165438+1October 2/kloc-0, the Meng brothers made the world's first manned air flight in a hot air balloon in Mouette Castle, Paris, flying for 25 minutes, flying over half of Paris and landing near Piazza Italia. This flight was earlier than the Wright brothers' plane 120 years. In terms of inflatable balloons, the French brothers Robert were the first people to fly into the sky in a balloon filled with hydrogen.

Italian Leonardo da Vinci put forward the idea of helicopter in 1483 and drew a sketch.

At the end of 19, an imaginary picture of a helicopter drawn by Leonardo da Vinci in 1475 was found in Milan Library, Italy. This is a huge spiral body, made of pulped linen, which looks like a huge screw. This aircraft is operated by four people. The spinning toys popular in Leonardo da Vinci's time may have inspired the great inventor's design. He proposed that vertical flight can be achieved by rotating the helicoid around the vertical axis. It is powered by a spring, and when it reaches a certain speed, it will take the body into the air. The driver stands on the chassis and pulls the wire rope to change the flight direction. In fact, Leonardo da Vinci said that his invention only provided a helicopter power, not a real working plane. Westerners say this is the earliest blueprint for helicopter design.

Although modern scientists think that the "helicopter" designed by Leonardo da Vinci may never take off, this design is still one of his most famous inventions. Today, Leonardo da Vinci is still regarded as the originator of the concept of twin-rotor helicopter.