From: johnhare@tampabay.rr.com   
      
   "Iain McClatchie"  wrote in message   
   news:45022fc8.0407151347.45b6a20d@posting.google.com...   
   > Henry> Gas injection at a well-chosen point for controlled flow separation   
   > Henry> does work; it's been tested.   
   >   
   > Excellent.   
   >   
   > Henry> Unfortunately, it tends to need a lot of gas, and this limits   
   benefits.   
   >   
   > References?   
   >   
   > If you want to do parallel staging, you need a way to make your upper   
   stage   
   > nozzle (a) survive the first 40 seconds of flight and (b) not throw your   
   > thrust vector around randomly.  If you add gas from the boosters' tanks,   
   > you might be able to dump most of the weight of the system with the   
   > boosters once you don't need it anymore.  The downside is that you will   
   > be carrying it for twice as long as you actually need it.   
   >   
   > Has anyone done solid nozzle inserts that get ejected at altitude?   
   >   
   I have wondered about multiple thrust chambers using one expansion   
   nozzle. 7 chambers with 7 throats into 1 expansion nozzle.   
   Expansion ratio of 10 at sea level, shutting down chambers until   
   the last one has a 70 ratio. Plumbing similar to the Russian multi-   
   chamber engines.   
      
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