about the maths
[ the major difference (between a caternary and a parabola) is the structural property, the catenary shape is as a direct result of the uniform gravitational force (its own weight). Which when flipped upside down can support itself].....[Although they pretty much look identica]l
Which explains why you can draw a parabola in Rhino but not a catenary, I suppose because there is no gravity in the digital world therefore it it irrelevant, as long as they look the same? I guess it is easier to calculate the y = x^2 rather than the hyperbolic cosine....
Welcome any more helpful maths hints....