When the first man tried to fly in the sky,imitating birds,our remarkable aviation history began.For thousands of years men tried to develop this dream,from the wings fastened with wax by Daedalus to various mechanical mechanisms called ornithopters.Aviation history began in the 15th century when Leonardo Da Vinci constructed a glider with two wings moved by a man's arms and legs.No one thought that man could construct any machine that coyld fly until 1782 when the French brothers "Montgolfier" constructed the first balloon,carrying men and animals up in the sky.It was the first time that a human being had been lifted off the ground.Balloons were the only means of human flight for almost 100 years.Sir George Cayley(1773-1857) engraved his concept of the fuselage on the silver disks which later on became the designs of the modern airplanes. He is the father of modern aviation history and is the first true aeronautical engineer.