Lockheed ring wing airliner concept.
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More:
https://books.google.com/books?id=zlosooWOcW8C&pg=PA40
Previously:
https://www.homemadetools.net/forum/...147#post134516
https://www.homemadetools.net/forum/...443#post185501
https://www.homemadetools.net/forum/...653#post186166
https://www.homemadetools.net/forum/...527#post185705
https://www.homemadetools.net/forum/...603#post174271