From: mp1walsh@adelphia.net   
      
   "Henry Spencer"  wrote in message   
   news:I0tE7K.Kws@spsystems.net...   
   > In article ,   
   >   wrote:   
   > >I read that the RP-1 and LOX tanks share a common bulkhead.   
   > >How do you keep the RP1 from turning to wax at LOX temperatures?   
   >   
   > Remember, you typically won't have *liquids* on both sides of that common   
   > bulkhead:  you'll have liquid above it, and the ullage space of the lower   
   > tank below it.  So a cold liquid above will cool the pressurant gas, but   
   > won't have much other effect.  If the cold side is down below, there may   
   > be no effect at all, given that you probably want to pressurize with warm   
   > gas to reduce gas mass.   
   >   
   > The classical Atlas had a common bulkhead -- a thin sheet of stainless   
   > steel, which as usual on Atlas, was stiffened by pressure difference --   
   > between LOX (above) and kerosene (below).  Originally it had insulation on   
   > it, but they eventually decided that the insulation wasn't doing anything   
   > useful, and deleted it.   
   > --   
      
   They had a few problems with it.   
      
   I think the deletion was because it was more of a problem than it   
   was worth.   
      
   Mike Walsh   
      
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