No, I did not know all that about the helecopter, but I think I was right on the date in the 1940's in this country, based on what you wrote.
Regarding the Wright brothers, I didn't ask where they flew it. I asked where they invented it. By the way, they first thought of flying it in Chicago, the windy city, but there were too many obstructions.
Did you know that the Wright brothers never went to college although their sister did? Also, neither one of them got married. When their sister did, they "disfellowshipped" her for a year for deserting their cause.
In high school, the Wright brothers started a neighborhood newspaper. In one issue they wrote that everyone should buy their paper unless they couldn't read or unless they were too poor to afford it.
The French were into flight and thought that the Wright brothers were two American hayseeds that didn't know what they were doing. Wilbur went to France for an air show. The French pilot made it half way around an air field. Wilbur made three circles around the field. All of a sudden, he was a hero. At the same time, Orville was in Washington D.C. demonstrating the airplane to the government. Unfortunately, there was a crack in the propellar blade, and it came apart and Orville crashed and almost died.
The Wright brother's mansion is one mile from my house. You can not find it in a travel guide and there are no signs out front and no tours. You couldn't find it unless you came to my town and asked for directions. The Wright brothers were very private people and so are we. Also, where I live, they don't need the revenue from crass commercial enterprises. We don't want any neon signs and popcorn stands in the hood.
Now, if you know where the airplane was invented then tell me. If you don't know, then don't cheat and look it up in a book.
Let me give you a hint. This city is also the birthplace of Martin Sheen, Erma Bomback, and Jonathan Winters. Also, Charles Franklin Kettering and Phil Donahue worked here. Erma Bomback's father and Martin Sheen's father were both factory workers for the same company. Erma went to college, Martin did not. In fact, Martin Sheen purposely flunked the college entrance exam so his father wouldn't waste his money on a college education. Now, he comes back to the local college every couple years and gives a free workshop to the theater majors.
I hope you enjoyed my rambling foray into history.