Ed Kyle wrote:
Has anyone else noticed that the proposed
SRB/SSME "Stick" vehicle has a second stage
diameter that is roughly the same as the
diameter of the Delta IV Common Booster
Core (5.1 meters)? And, by the way, that
the SRB/SSME second stage length seems to
be not much less than the length of a CBC?

Coincidence or Cooperation?

I guess the White Elephant second stage diameter is driven by the CEV
diameter and the length is then driven by the propellant required.

Using a Delta IV common booster would save a lot of development work,
but that rather defeats the puropose of the Stick.