Originally Posted by
Vzlet
I took it to mean that (as in any such rigorous requirements-definition exercise) one would start with a known (The C-130. How might we obtain the capabilities of three?) and perform the calculations necessary to clarify a viable alternative.
No, the explanation for the C-390 designation is more prosaic (and fairly obvious to anyone familiar with Embraer).
(Or maybe Lonewolf is onto something!)
Well he certainly appears to be on something ...