Answer:
Wilbur Wright looked to nature for inspiration in his flight engineering and had done so since he was a child.
Explanation:
The Wright Brothers, the inventor of building the world's first successful airplane, wrote letters to Smithsonian Institution while they were making the human flight possible.
On May 30, 1899, Wilbur Wright wrote the letter to the institution asserting that human flight is possible. He said that he has been observing birds since his childhood and interested in mechanical and human flights. He had made bats of different sizes since childhood especially after reading the stories of Cayley's and Penaud's machines.
Wilbur has looked to birds for the techniques of gymnastics, as they are the world's perfectly trained gymnasts.
Thus the 1899 letter concludes that Wilbur has looked to nature for inspiration and has done so since his childhood.
Last sentence: 'earning their creators...' should be 'its creators'. and 'our intended landing point' should be its intended landing point.
Also, you might want to consider whether the last sentence borders on being a run-on, and whether breaking it into two sentences might not enhance readability.
Indeed is one word, other than that I think the entire thing is very good.
