Introduction
The beginning of the concept of aviation began in Chinese in the fourth century A.D. In 400 B.C a toy that consisted of feathers at the end of a stick was spun between the hands to generate a lift and after its release it provided a free flight, It is assumed that those who build the toys were inspired by the auto rotating nature of seeds from trees such as Sycamore. 1
In the year 1480, Leonard da Vinci discovered that a screw shaped device well made from a starched linen can rise in air if turned quickly.
