From: henry@spsystems.net   
      
   In article <45022fc8.0407102126.15cd2a58@posting.google.com>,   
   Iain McClatchie  wrote:   
   >Suppose that for the low-altitude portion of the flight, and for ground   
   >testing, you inject some significant amount of gas into the nozzle.  The   
   >idea is to at least get predictable flow seperation, to reduce the flow   
   >to ambient pressure differential around the outer parts of the nozzle   
   >and to perhaps reduce the Isp loss...   
   >Is this a known technique?  Does it work?   
      
   Gas injection at a well-chosen point for controlled flow separation does   
   work; it's been tested.  Unfortunately, it tends to need a lot of gas, and   
   this limits benefits.   
   --   
   "Think outside the box -- the box isn't our friend."    |   Henry Spencer   
                                   -- George Herbert       | henry@spsystems.net   
      
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