Sunday, January 30, 2011
This is a method of reducing volume and perhaps also improving mass fraction by altering the shape of solid motor casings and using parts of the case as the nozzle for the next stage. This design was called Conosphere in a 1972 JPL study. This reminds me a bit of the lower stage Sea Dragon terminating in a conical tank that would sit inside the upper stage nozzle. Arca Haas uses nozzles as the interstage couplers as suggested in the 2nd evolution in this diagram. Perhaps they could benefit from considering the conosphere design, but would that work well with a hybrid rocket stage? Read more about this at The Unwanted Blog.