Kelly was born in Scarborough, England. Bonoza received a good education since childhood, but Kelly mainly benefited from a mentor, George, a famous mathematician at that time, who knew about natural science. When Wacker was Kelly 10 years old, Frenchman Rozier made the first manned balloon flight in history, which made young Kelly have a great interest in aviation. 1792, he made a series of experiments with a toy helicopter named "China Flying Gyro". 1804, he wrote his first paper on flight principles. Kelly proposed in the paper that modern aircraft should adopt the mode of fixed wing+propeller instead of imitating the vibrating wing of birds. He described the outline of modern aircraft in detail, and pointed out that proper stability is produced by obtaining some angles when manufacturing the wing surface, which is the dihedral angle of modern aircraft. He also pointed out that the tail must have vertical and horizontal rudder surfaces and the aircraft must be streamlined. He also studied the relationship between speed and lift, wing load and how to reduce the weight of aircraft. 1799, Kelly carved his modern aircraft design on a silver plate (now in the London Science Museum), with an explanation of various forces on the wing on one side and a sketch of the aircraft on the other. Therefore, Kelly is recognized as the founder of the plane and known as the "father of aviation". He founded the scientific flight principle for aircraft heavier than air (before, aviation was "an absurd science in the eyes of the public"). When Kelly was 23, she made a helicopter model. Later, by studying the driving force of bird wings, he added a rotating arm and made a glider model. After a long period of experiment and transformation, Kelly finally flew hundreds of meters with the groom in the first manned spaceship heavier than air in aviation history on March 26, 2 1, 1853, and successfully completed the free flight of the first manned glider in human history.