https://www.cnn.com/travel/article/nasa-ad-1-plane-oblique-pivoting-wing/index.html
Not many aircraft can claim to be truly one of a kind, but the NASA AD-1 is undoubtedly one of them. No other piloted plane has ever been built with a wing that could turn to a lopsided 20 to 2 angle -- but the fascinating story is why it did at all.
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