What are the most and least efficient rockets?

[Hyperion5]

I was just pointing out that the scaling laws can cut both ways. And there lots of them.

Indeed. I for one would be interested to see that list of scaling laws you mentioned. Is it on the forum somewhere?

Actually all support structures take a performance hit with scaling, struts/beams etc? Generally their load bearing capacity is proportional to cross sectional area, cubesquare leads to their mass growing faster than strength, no?

This is the moment when I wish my relative (getting his PhD in civil engineering) were sometimes reading through this forum.  Structural issues are his forte.  I know it's a different field, but I'd be willing to bet there's more to structural strength than that.  I'll have to show him that and get back to you.  Unless of course someone with actual structural engineering expertise intervenes first.