"Bald Eagle" <cre### [at] netscapenet> wrote:
> ... I'd say that this demonstrates that a solution isn't
> possible, given the parameters.
>

> So I think that some of the constraints are mutually exclusive.

However; depending on if the design parameters can be modified and still provide
an acceptable solution to the intended goal:

Perhaps an elliptical  "torus" that is in reality a Dupin cyclide would be just
the thing:
https://en.wikipedia.org/wiki/Dupin_cyclide#Elliptic_cyclides

- BW

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