Let us place ourselves in 1891. A German engineer Otto Lilienthal called senses the possibility of flight plan and start working on the investigation of airfoils. His early discoveries led him to conclude that a curved sustained more than one plane. With these first steps discovers the laws of nature governing the flight.
After ten years of hard study and sacrifice made its first flights planned. His great theme, which helped him continue his trials cheerfully, was this: "An idea is worthless, do you have any aircraft, a flight is worth it." Then flew!
Years passed, and her jumps were getting longer, until the point that it had to build a hill to jump off it. Otto was fixed in the evolution of wind up on a hill: it arriving at the foot of the slope has no choice but to turn up.
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