Brian and FP, thank you !


>>> This question was asked before?...

Sure thing. But new ideas and thoughts come up all the time - the proof ! Earth would still be flat if we stopped at the first answer.

The Sears Haack body looks good. And I'll have a look at catenary as well.


I'm getting closer ... ;)

Gaudì, he used to estimate the shape of his arcs by putting weights on a rope in tensional status. The resulting shape was, inverted, the shape of the arcs. It's indeed a catenary.