The “Sea Dragon” launch vehicle concept is reasonably well known: a giant “dumb” booster, using two pressurized stages built massively heavy using shipyard tolerances. it would be floated out to sea and fueled while in the water. Everything about it was meant to be simple. However, this was the *final* Sea Dragon design; earlier iterations had some different configuration details. Unfortunately, while the final design is well known (detailed diagrams of it are often shown, usually reproductions of the diagram I posted on my site way back in 2005), the evolution of the design from initial concepts is not well documented. And thus I have artwork depicting a rather different version that used a conical first stage tucked into a giant fixed conical nozzle of the second stage. It *appears* to be substantially more complex than the later version, possible pump fed with lighter structures. Sadly, art is all I have. If anyone has *anything* on this design – data, diagrams, descriptions, etc. – I’d love to see it.
