Yup , another thing to think about is if you have a lot of nozzles in your 100 ratio plug , after 50,000 ft you shut off 1/2 of them , Instant 200 ratio ! ( Isp 300 to 340 )
I don't think you get to 340 with even an infinite expansion in vacuum.
Not sure I like the idea of blowdown, by the time you add the extra volume of tank , it weighs the same as the pressurizing system .
Kevin Bollinger
Even if it weighed MORE than the pressurizing system (which it should, in theory, but might not in practice), it would still be worthwhile to completely get rid of a subsystem.
John Carmack
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