We know that humanity was able to solve many very complex tasks in the past, and it took typically around 100 years. That is flight of heavy than air objects,
That seems to be false. Leonardo da Vinci had drafts of flying machines and it took a lot longer than 100 years to get actual flight.
That is why I use wording "typically around" to show that I meant medium time of large dedicated efforts. Leonardo's work was not continued by other scientists of 16 century so it was not part of large dedicated effort. It seems that other creators of flying machines tried to invent them from scratch but not based on results of Leonardo.
Even in 19 century collaboration between aviation enthusiasts was very small. Probably they learned from failed attempts of others - like ups, flying wings does not work, lets try rotating wings. if they collaborate more effectively, they could come to the working design quicker.
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