ROTON type engines and liquid monopropellants

On Sunday, September 6, 2009 at 2:38:45 AM UTC+1, Earl_Colby_Pottinger wrote:
I was just thinking about monopropellants. Most have low ISPs compare
to bi-propelleants but can be very dense. ie Peroxide/Alcohol mixes
for example.

Since ROTON type engines are self-pressuring, one can build a system
with very light weight tanks and high expansion ratio engines. Could
the mass ratios of such a design lead to a reasonable TSTO rocket?

Earl Colby Pottinger