History tells us that the first concept of man trying to defy gravity and actually fly was through a helicopter flight. Accounts date way back 400 BC in ancient China with a hand-spun toy made from a stick and feather that flew when rapidly spun between palms to generate enough lift and then released.
However, the very first, more realistic concept of a helicopter dates in the 15th century when Leonardo Da Vinci attempted to produce a working helicopter (gyroscope). This was not made into production since his sketch was noted to be way ahead of his time and the period had inadequate technology and understanding about the nature of lift and the availability of a machine that could create such massive lift.
Several other attempts had been made over the next centuries. All these had failed but had contributed little advancements on the development of the helicopter. The reason of failure? Same as that of Da Vincis time. From the time of Da Vinci up to the end of the 19th century, there was no adequate machine that is powerful enough to generate power and create lift.
The breakthrough came when the internal combustion engine was invented that made full-size...