SR-71: Designed In The '50s

"In the early 60s no computers existed that could render or even come close to computing how this aircraft should be built. It was all done on drawing boards with pencils, rulers and protractors (if you remember what any of these are.) That’s one incredible feat if you think about it."

We use to call that "American Know-How".

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https://frontlinevideos.com/bl....ogs/videos/researche