Thankyou Max

Formula for a catenary: y = 2 * (exp(x/2) + exp(-x/2))/2

A more general formula is avalue * (exp(x/avlaue) + exp(-x/avalue))/2
But in this case, avalue is just a scaling factor, so by using Scaling in MoI, the avalue is changeable.
For example doing a Scaling of 4, on a pre-created catenary, changes the avalue=2 to avalue = 8.

It might be nice to have a few parameters like avalue, bvalue ... ?

I should have referred to using U and V as creating a series of 3d curves which might be loft-able to a surface or solid.

- Brian